Academic literature on the topic 'Reproductive parasitism'
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Journal articles on the topic "Reproductive parasitism"
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Vidal, Luísa Lauren Lima, Leopoldo Ferreira Oliveira Bernardi, and Sonia Aparecida Talamoni. "Host-parasite associations in a population of the nectarivorous bat Anoura geoffroyi (Phyllostomidae) in a cave in a Brazilian ferruginous geosystem." Subterranean Biology 39 (June 9, 2021): 63–77. http://dx.doi.org/10.3897/subtbiol.39.64552.
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Parasitic relationships between Neotropical bats and their ectoparasites are not well known, even though parasitism is one of the factors that can affect the fitness of a host population. This study characterized parasite-host relationships in relation to sex, age, body size and reproductive status in a population of Anoura geoffroyi using the indices of Prevalence, Mean Intensity and Mean Abundance. Total prevalence for 93 sampled bats was 94.6%. Two species of streblid flies that are considered primary parasites of A. geoffroyi, Exastinion clovisi (n = 203) and Anastrebla modestini (n = 152), were the most abundant ectoparasites, followed by Trichobius sp. (n = 7). Two mite species, Periglischrus vargasi (Spinturnicidae) (n = 98) and Spelaeorhynchus praecursor (Spelaeorhynchidae) (n = 11), were also found. We recorded higher mean abundance and intensity of parasitism in pregnant females compared to reproductive males and reproductively inactive females, for different specific associations of ectoparasites. Host age and body condition had no effect on the parasitological indices. Even with high rates of parasitism, parasitic load did not influence host body condition, but infestation rates by mites were higher in reproductive males and higher by flies in reproductive females, showing that ectoparasites can have variable influences between the different stages of the life history of these host bats. Thus, the reproductive activity of the hosts could be an adverse factor for resistance to parasite infestations.
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Medina, Iliana, and Naomi E. Langmore. "Host density predicts the probability of parasitism by avian brood parasites." Philosophical Transactions of the Royal Society B: Biological Sciences 374, no. 1769 (February 11, 2019): 20180204. http://dx.doi.org/10.1098/rstb.2018.0204.
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The spatial distribution of hosts can be a determining factor in the reproductive success of parasites. Highly aggregated hosts may offer more opportunities for reproduction but can have better defences than isolated hosts. Here we connect macro- and micro-evolutionary processes to understand the link between host density and parasitism, using avian brood parasites as a model system. We analyse data across more than 200 host species using phylogenetic comparative analyses and quantify parasitism rate and host reproductive success in relation to spatial distribution using field data collected on one host species over 6 years. Our comparative analysis reveals that hosts occurring at intermediate densities are more likely to be parasitized than colonial or widely dispersed hosts. Correspondingly, our intraspecific field data show that individuals living at moderate densities experience higher parasitism rates than individuals at either low or high densities. Moreover, we show for the first time that the effect of host density on host reproductive success varies according to the intensity of parasitism; hosts have greater reproductive success when living at high densities if parasitism rates are high, but fare better at low densities when parasitism rates are low. We provide the first evidence of the trade-off between host density and parasitism at both macro- and micro-evolutionary scales in brood parasites. This article is part of the theme issue ‘The coevolutionary biology of brood parasitism: from mechanism to pattern’.
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Ferrer-Maza, Dolors, Josep Lloret, Marta Muñoz, Elisabeth Faliex, Sílvia Vila, and Pierre Sasal. "Parasitism, condition and reproduction of the European hake (Merluccius merluccius) in the northwestern Mediterranean Sea." ICES Journal of Marine Science 71, no. 5 (January 9, 2014): 1088–99. http://dx.doi.org/10.1093/icesjms/fst217.
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Abstract It is well known that parameters relating to physical condition and reproduction of fish provide essential data for estimating the productivity of exploited populations, as is the case with the European hake (Merluccius merluccius) in the northwestern Mediterranean Sea. Although parasitism might affect these parameters, research in this area is very scarce (and in the case of the Mediterranean almost non-existent). This study evaluates for the first time the potential link between parasitism, condition and reproduction of the European hake. Indicators of fish energy reserves (total lipid content in liver and gonads) and reproductive capacity (fecundity, egg quality and atresia) were evaluated, as were the prevalence and intensity of infection by metazoan parasites. The results indicate that the impact of anisakid nematodes is mostly negative and occurs mainly when hake are allocating their energy reserves to gonadal development. Although the results reveal a link between parasitism, condition and reproduction, we concluded that the northwestern Mediterranean hake population is in equilibrium with its metazoan parasites, which are not causing severe impairment to their physical condition or reproductive capacity.
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Rohwer, Frank C., and Scott Freeman. "The distribution of conspecific nest parasitism in birds." Canadian Journal of Zoology 67, no. 2 (February 1, 1989): 239–53. http://dx.doi.org/10.1139/z89-035.
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Conspecific nest parasitism is much more common in birds that have self-feeding young than in those with parentally fed young. We review evidence for this pattern and suggest that it is produced by a fundamental dichotomy in selection pressure for defense against conspecific parasites. Species that feed their young should experience intense selection pressure for effective defense against parasitism, because their reproductive output is limited by post-hatching parental care. Species that have self-feeding young, however, experience only mild selection for parental defense against parasites, because their reproductive output is constrained chiefly by their ability to produce eggs. For such birds, parental care can be shared with little or no detriment to survival of young. Within both the self-feeders and the birds that feed their young the occurrence and intensity of conspecific nest parasitism is dictated primarily by the ability of parasitic females to find host nests. This pattern is particularly clear among waterfowl, where conspecific nest parasitism is frequent in ducks that nest in cavities, over water, or in high densities on islands. We review evidence that suggests greater conspecific nest parasitism for parentally fed species that nest in colonies than parentally fed species with dispersed nests. We also make predictions about the distribution of conspecific nest parasitism in nonavian groups.
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He, X. Z., Q. Wang, and D. A. J. Teulon. "The effect of parasitism by Aphidius ervi on development and reproduction of the pea aphid Acyrthosiphon pisum." New Zealand Plant Protection 58 (August 1, 2005): 202–7. http://dx.doi.org/10.30843/nzpp.2005.58.4273.
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The effect of parasitism by Aphidius ervi Haliday (Hymenoptera Aphidiidae) on development survival and reproduction of pea aphid Acyrthosiphon pisum (Harris) (Hemiptera Aphididae) of different ages was studied in the laboratory Aphids parasitised when 1 and 2 days old (1st and 2nd instar) died at the 4th instar However those parasitised when 3 to 6 days old (3rd and 4th instar) could reach the adult stage following parasitism and those that were parasitised after 4 days old (late 3rd instar) were still able to produce progeny In comparison with the unparasitised aphids the parasitised aphids had a significantly shorter reproductive period and produced significantly fewer progeny and thus had significantly lower intrinsic rates of increase net reproductive rates shorter generation time and longer doubling time The potential impact of the parasitoid on host population growth is discussed
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McLaren, C. M., B. E. Woolfenden, H. L. Gibbs, and S. G. Sealy. "Genetic and temporal patterns of multiple parasitism by brown-headed cowbirds (Molothrus ater) on song sparrows (Melospiza melodia)." Canadian Journal of Zoology 81, no. 2 (February 1, 2003): 281–86. http://dx.doi.org/10.1139/z03-002.
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Identifying the factors used by an avian brood parasite to select host nests is important in understanding the determinates of individual reproductive success, yet such factors are poorly known for most parasitic species. Insights into these factors may come from understanding the conditions under which female parasites lay more than one egg per host nest (multiple parasitism). Using genetic techniques we examined patterns of multiple parasitism on a preferred host, the song sparrow (Melospiza melodia), to determine some basic patterns of multiple parasitism. Multiple parasitism involved equal frequencies of the same female parasitizing the same nest again and two or more females parasitizing the same nest. The frequency of multiple parasitism increased as the season progressed. We also documented a high frequency of parasitism that was not synchronized with host laying. These laying patterns may be the result of cowbirds "making the best of a bad situation" or of suboptimal host choice by inexperienced, nonselective females.
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Heins, David C., Britt Ulinski, Jill Johnson, and John A. Baker. "Effect of the cestode macroparasite Schistocephalus pungitii on the reproductive success of ninespine stickleback, Pungitius pungitius." Canadian Journal of Zoology 82, no. 11 (November 1, 2004): 1731–37. http://dx.doi.org/10.1139/z04-171.
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We quantified the relationship between reproductive status in the ninespine stickleback, Pungitius pungitius (L., 1758), and parasitism by plerocercoids of the cestode Schistocephalus pungitii Dubinina, 1959 in Airolo Lake, Alaska, using fish specimens from the 1994, 1998, and 2000 reproductive seasons. Infected females were inhibited from producing clutches of eggs and infected males showed much-reduced testicular condition. These deleterious effects on reproduction appear to involve nutrient theft. In addition, there appears to be a greater physical effect of the parasites crushing the gonads of host fish. The results of this study support the theoretical prediction that S. pungitii is a parasitic castrator, as the fitness of the majority of infected female ninespine stickleback was apparently reduced to zero, and there may be a similar effect among the majority of male ninespine stickleback. The symptoms of infection may represent adaptive parasite manipulations resulting in larger, more fecund parasites or an extended parasite-transmission period, although the possibility that the symptoms represent nonadaptive side effects cannot be excluded.
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Pöysä, Hannu. "Low host recognition tendency revealed by experimentally induced parasitic egg laying in the common goldeneye (Bucephala clangula)." Canadian Journal of Zoology 81, no. 9 (September 1, 2003): 1561–65. http://dx.doi.org/10.1139/z03-147.
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Host-parasite relatedness has been suggested to promote the evolution of conspecific brood parasitism, an alternative reproductive tactic pursued by females in several animal taxa. An essential prerequisite for relatedness to promote brood parasitism is accurate kin recognition, including the recognition of related hosts by parasites. I performed a field experiment to address the accuracy of host recognition by parasites in the common goldeneye (Bucephala clangula), a cavity-nesting duck. I studied whether parasites discriminate between experimental nests that did not have a host (i.e., new nest boxes that contained chicken eggs dyed to mimic the colour of common goldeneye eggs) and real nests that did have a host (i.e., active nests that progressed to incubation). Parasitic egg laying in the experimental nests was not constrained by the lack of contemporarily available nests that had a host; it was also not constrained by the lack of suitable and empty nest sites. There was no difference in the start of parasitic laying between the experimental and real nests. The experimental nests and real nests were equally parasitized. The findings suggest that host recognition by parasites is not sophisticated in the common goldeneye, questioning the possible function of accurate kin recognition in brood parasitism in this species.
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Wilson, Scott, and Peter Arcese. "Nest Depredation, Brood Parasitism, and Reproductive Variation in Island Populations of Song Sparrows (Melospiza Melodia)." Auk 123, no. 3 (July 1, 2006): 784–94. http://dx.doi.org/10.1093/auk/123.3.784.
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Abstract Theory suggests that the persistence of metapopulations will be influenced by the degree of synchrony in the dynamics of their component populations. Various studies have shown that climate can promote synchrony in the size of adjacent populations linked by dispersal, but fewer studies have examined the effects of climate on underlying demographic rates. We studied annual variation in the timing of breeding and reproductive rates in Song Sparrow (Melospiza melodia) on islands linked by dispersal to determine whether biotic factors acting at local scales or climatic factors acting at a regional scale were more influential of variation in demography. The onset of egg laying varied markedly among years but was roughly synchronous across islands within years. Despite this synchrony, island populations varied markedly in reproductive rate, mainly from spatial variation in nest depredation and brood parasitism. In general, populations farther from Vancouver Island and with fewer resident predators experienced less nest depredation and brood parasitism, and higher reproductive rates, than populations closer to Vancouver Island. Our results show that even when climate acts regionally to synchronize reproductive timing in adjacent populations, its effects on reproductive rate may be overridden by biotic factors that vary among populations. Depredación de Nidos, Parasitismo de Cría y Variación Reproductiva en Poblaciones Isleñas de Melospiza melodia
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Kabat, Alan R. "Effects of trematode parasitism on reproductive output of the bivalve Transennella tantilla." Canadian Journal of Zoology 64, no. 1 (January 1, 1986): 267–70. http://dx.doi.org/10.1139/z86-044.
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Transennella tantilla, a small protandric brooding marine bivalve (Veneridae), from San Juan Island, Washington, U.S.A., was studied to determine the effects of parasitic castration on reproductive output. In the population studied, 31% of the brooding females were infected with larvae of the digenetic trematode Telolecithus pugetensis. Usually, such parasites cause host sterility, but here a significant number of parasitized adults continued to produce and brood embryos, although at a lower rate than did nonparasitized adults. Sequential brooding in T. tantilla may allow parasitized females to continue producing small numbers of embryos. Parasitism plays an important role in limiting the total reproductive output of this population of T. tantilla.
Dissertations / Theses on the topic "Reproductive parasitism"
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Holmes, Michael J. "When does cheating pay? worker reproductive parasitism in honeybees." Thesis, The University of Sydney, 2014. http://hdl.handle.net/2123/12055.
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In all societies, cooperation between members is necessary to allow the society to function smoothly. However, as the interests of individuals rarely overlap completely, all societies contain members that act selfishly at the expense of the greater entity. Thus, policing mechanisms are generally required in order to maintain cohesion within the society. In social insects, conflict between individuals and the society are often reproductive in nature. Kin selection theory predicts that in haplo-diploid, polyandrous species such as honeybees, workers should largely refrain from producing their own offspring, as the workers collectively have higher inclusive fitness if they rear the sons of their mother, the queen. However, opportunities for personal reproduction at the expense of colony-level fitness are often exploited by individual workers, a phenomenon known as worker reproductive parasitism (WRP). This has led to the evolution of worker ‘policing’, in which workers selectively destroy worker-laid eggs that would otherwise be reared at the colony’s expense. In my PhD, I have investigated WRP in both the Western honeybee Apis mellifera, and the Asian hive bee A. cerana. The major theme of my research has been to elucidate the circumstances that afford opportunities for potential reproductive parasites to evade worker policing. This research is significant, as it yields insights into the conflicting selective forces that lead to the formation of societies, the selfish behaviour of the individuals that comprise them and how this behaviour is controlled. These insights are applicable to all social species, including humans.
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Hillegass, Melissa Ann. "SEX-BIASED PARASITISM AND THE REPRODUCTIVE COSTS OF PARASITES IN A SOCIAL AFRICAN GROUND SQUIRREL." Master's thesis, University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2205.
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Vertebrate males frequently carry higher numbers of parasites than females. This bias in parasite loads could be a consequence of sexual selection. Grouping species are also assumed to be afflicted with larger numbers of parasites than solitary animals and associated costs of this parasitism could vary with group size or structure. I examined sex-biased parasitism and the influence of group size on parasite loads in Cape ground squirrels (Xerus inauris), a highly social species that occurs in the arid regions of southern Africa. Males carried three times as many ectoparasites as females, but females harbored nearly three times more endoparasites than males. Amount of time spent (per hour) autogrooming was similar between males and females, but amount time spent allogrooming by adult female was over eleven times that of adult males. Longer allogrooming of group members could be decreasing the numbers of ectoparasites of group members and ultimately the group. Males infrequently give or receive allogrooming and travel in very large home ranges, potentially increasing their exposure to ectoparasites. However, movement throughout a large home range may result in males foraging in areas with lower densities of fecal pellets, which could explain the lower endoparasite loads observed in males. When I considered the age class of group members, female age classes were similarly parasitized but male age classes were not. Sub-adult males carried similar ectoparasite loads to adult males and similar endoparasite loads to adult females. This result is of particular interest because sub-adult males are becoming scrotal but typically remain in the group until adulthood. Sexual selection does appear to influence parasite loads in this species, and parasite removal or avoidance potentially mitigates individual parasite loads and their associated costs. Parasites can be detrimental to the health, longevity, and reproduction of their hosts, but these costs are rarely quantified. I removed ectoparasites and endoparasites from Cape ground squirrels for three months and evaluated changes in female body mass, reproduction, burrow use, and grooming in response to parasite removal. Female body mass did not increase with parasite removal, but reproductive success (per capita offspring raised to emergence) increased nearly four-fold, while allogrooming by treated females decreased. Since breeding is highest in the late winter dry season when fewer resources are available, the impact of parasites may be highest during this season. Lactation and gestation are the most physiological stressful processes that females undergo, and the dramatic increase in reproductive success in treated females suggests that these females are able to allocate more resources to reproduction than females afflicted with parasites. These results suggest that studies investigating reproduction and fecundity must consider the vulnerability of the host to parasite infection and the potential impact on reproductive success.M.S.
Department of Biology
Sciences
Biology MS
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Deas, Joseph Benjamin Jr. "The Egg Stacking Strategy: Reproductive Plasticity in Response to Egg Parasitism in Mimosestes Amicus." Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/293440.
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All organisms live in environments that are variable across space and time. Variation in selection across these environments may lead to the evolution of generalist genotypes that express phenotypic plasticity, in which one genotype can alter their phenotype (e.g., morphology, behavior, physiology) to match changes in environmental conditions, so that they may survive across a range of environments. In many egg-laying organisms that lack parental care, choosing an oviposition site is critical. The egg is an immobile stage of an animal's life cycle and mothers must balance a complex set of risks in deciding where to place their eggs. Because many biotic and abiotic factors are sources of selection on offspring survival, there is an advantage for females to evolve strategies in oviposition site selection to improve survival. This dissertation focuses on phenotypic plasticity in an offspring protection strategy that is triggered by natural enemies. In the seed beetle Mimosestes amicus (Coleoptera: Chrysomelidae: Bruchinae), females lay eggs on the outside of seed pods of legume trees and beetle larvae bore into and develop in the limited and discrete tissue of the seed. While most eggs are laid singly, I documented that beetle females superimpose eggs atop each other ("egg stacking") in response to the presence of egg parasitoids or parasitized eggs. In my first chapter, I investigated whether egg stacking is a strategy for protecting eggs from parasitism. In my second chapter, I examined female responses to variation in the number and dispersion of parasitized eggs on seed pods. Lastly, I investigated whether the intensity of stacking was affected by egg limitation (the risk of depleting her eggs before utilizing all hosts) or time limitation (losing reproductive ability or dying before laying all of her eggs). This study is unique in that it extends life history theory on egg and time costs to explain variation in egg protection behavior. The insights gained from this dissertation provide a foundation upon which we can examine how interactions among trophic levels impact the behavioral decisions made by insects that allow them to increase offspring survival.
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Branson, David Heath. "Reproductive Allocation and Survival in Grasshoppers: Effects of Resource Availability, Grasshopper Density, and Parasitism." DigitalCommons@USU, 2001. https://digitalcommons.usu.edu/etd/6583.
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A major challenge in ecology is to understand intraspecific variation in life histories. Variation in resource availability can lead to differences in reproductive allocation and life histories. Grasshoppers are a good organism for the study of variation in life histories, since they exhibit life history plasticity in response to biotic and environmental factors. An optimality model for grasshoppers was developed that predicts optimal total allocation to reproduction and optimal effort-per-offspring as functions of resource availability and mortality. Relative allocation to reproduction is predicted to increase with resource availability, while relative allocation to survival declines. A resource-based trade-off between egg size and number does not exist, as optimal egg size is predicted to be independent of resource intake. I examined if changes in reproductive allocation and survival of Melanoplus sanguinipes (Fabricus) under a range of resource availabilities fit the predictions of the model. The patterns of reproductive allocation and survival in the field were in qualitative agreement with the predictions.
I examined the importance of density, resources, and parasitism on the life history patterns of grasshoppers. I conducted an experiment to examine if differences in reproductive allocation of M. sanguinipes are primarily explained by exploitative competition. Per capita resource availability explained a significant amount of the variation in reproduction , as expected with exploitative competition. M. sanguinpes grasshoppers appeared to trade off resource allocation to reproduction for that of allocation to survival, because per capita resource availability did not affect survival.
Careful examinations of changes in life history characteristics in response to parasitism are lacking, despite the fact that parasites often influence resource availability for the host. I investigated the effects of a grasshopper ectoparasitic mite on grasshopper reproduction and survival. Mites had small effects on grasshopper survival. As predicted, both species had reduced initial and total reproduction, and completed development of a lower percentage of ovarioles initiated when parasitized. These experiments act to expand our knowledge of life history theory and further our understanding of grasshopper life history variation and population fluctuations.
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Madelaire, Carla Bonetti. "Relação sazonal entre reprodução, imunidade e ocorrência de endoparasitas em anfíbios anuros da Caatinga." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/41/41135/tde-22012013-152255/.
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A grande maioria das espécies de anfíbios anuros apresenta um padrão de reprodução sazonal, caracterizado nos machos por um pico de andrógenos que desencadeia maturação testicular, bem como manutenção do comportamento sexual. No entanto, os altos níveis de andrógenos podem apresentar um efeito imunossupressor, podendo também aumentar a probabilidade de infecções parasitárias. A Caatinga brasileira é caracterizada por altas temperaturas e chuvas sazonais e imprevisíveis que determinam o padrão reprodutivo e de atividade dos anuros dessa região, algumas espécies como P. diplolister apresentam comportamento de estivação durante a seca, já Rhinella Jimi e R. granulosa permanecem ativos quanto ao forrageamento durante este período. As drásticas variações deste ambiente poderiam acentuar os ajustes fisiológicos apresentados por essas espécies, principalmente para a espécie estivadora. Foram estudadas as inter-relações entre caracteres morfológicos, fisiológicos e parasitológicos dessas três espécies de anuros, em três períodos distintos, (A) durante a temporada reprodutiva, em um período entre dois surtos reprodutivos (período entre chuvas); (B) durante um surto reprodutivo que acompanhou um evento de chuvas e (C) no período da seca. As duas espécies de Rhinella apresentaram evidências de modulações imunológicas de acordo com período, e correlações entre caracteres imunológicos, fisiológicos e número de parasitas. Pleurodema diplolister apresentou padrões imunológicos coerentes com o processo de economia energética durante a estivação, como redução do número de leucócitos totais, com concomitante aumento na contagem de eosinófilos e relação positiva entre intensidade parasitária e contagem total de leucócitos. As três espécies estudadas apresentaram depleção das reservas energéticas durante o período reprodutivo, possivelmente associada à alta demanda energética do comportamento vocal. Também apresentaram padrões similares de maturação testicular, evidenciando que as espécies estudadas possuem um padrão de reprodução oportunista, típico de espécies que ocupam ambientes áridos. As três espécies também apresentaram relação entre parâmetros imunológicos e carga parasitária, no entanto, para esclarecer as relações causais entre esses fatores, são necessários testes adicionais de desafio imunológico, bem como infecção experimental por parasitasMost part of anurans show a seasonal pattern of reproduction, when males display high levels of androgens associated with testicular development and sexual behavior maintenance. However, high androgens levels also can shows an immunosuppressive effect resulting in increased parasitological disease. The semi-arid Caatinga is an environment characterized by high temperatures and unpredictable seasonal rains that determine the breeding season of anurans. During the dry season, Pleurodema diplolister aestivate borrowed, Rhinella granulose and R. jimi remain foraging. Drastic variation in this environment could increase the physiological adjustments displayed by these species, mainly by P. diplolister. The inter-relation between morphological, physiological and parasitological characters was studied in these three anuran species, in three different periods: (A) dry season, (B) during the rainfall, when males are calling, and (C) in the interval between rainfalls, when males are foraging within the reproductive season. The Rhinella species presented evidences of immunological modulations according to the period and correlations between immunological, physiological parameters and number of parasites. Pleurodema diplolister presented immunological patters consistent with the process of energy economy during aestivation, including total leukocyte reduction, along with eosinophil increase and positive relation between total leukocyte and parasite intensity. The three species presented depletion in energy reserves during the breeding season, possibly associated with the high energy demand of vocal behavior. They also presented a similar pattern of testicular development, indicating that these species present opportunistic reproduction pattern, typical of species that occupy arid environments. The studied species also showed correlations between immunological parameters and parasite load, however, to clarify the causal relation between these parameters, additional immunological challenges and experimental parasite infection are necessary
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Eadie, John McAllister. "Alternative reproductive tactics in a precocial bird : the ecology and evolution of brood parasitism in goldeneyes." Thesis, University of British Columbia, 1989. http://hdl.handle.net/2429/29092.
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Facultative brood parasitism is common among waterfowl (Anatidae), but we have limited understanding of the ecological or evolutionary basis for this behaviour. I studied facultative brood parasitism in two species of cavity-nesting ducks, the Barrow's goldeneye (Bucephala islandica) and the common goldeneye (B. clangula). During a four year study in central British Columbia, I used field experiments, observational studies of marked individuals, and simulation models to (i) examine the consequences of brood parasitism to hosts, and (ii) identify the factors that promote and maintain parasitic behaviour.
In order to assess the costs and benefits of brood parasitic behaviour, I first examined proximate influences on reproductive performance of goldeneye females. Variance in reproductive success among females was substantial and some females were consistently more successful than others. Reproductive success was also influenced by breeding experience, time of breeding, and by the availability and quality of nest-sites. Circumstantial evidence suggests that females compete exploitatively and aggressively for nest-sites and brood territories. I argue that such conditions favour the evolution of parasitic reproductive behaviours.
Parasitic egg-laying occurred frequently during the four years of this study; 35% of all nests were parasitized, while 17% of all eggs were parasitic. Parasitism had few deleterious effects on the reproductive success of hosts. On average, parasitized females produced as many of their own young as non-parasitized females, and there was no effect of parasitism on female survival or on the growth and survival of host young. Hatch success was reduced in some host nests when the frequency of parasitism was high, but such levels of parasitism were uncommon. These results suggest that the costs of brood parasitism to precocial hosts are low. My findings do not support recent speculations that hosts benefit from being parasitized.
Goldeneye females exhibited few defences against parasitic intrusions. Females were more likely to desert their nests when clutch sizes were extreme (i.e., > 16 eggs), but desertion rates did not differ significantly between parasitized and non-parasitized nests. I found no evidence that hosts reduce the size of their own clutch when parasitized, contrary to Anders son & Eriksson's (1982) findings for common goldeneyes in Sweden. On some occasions, hosts removed eggs from their nests, but this appeared to be a response to damaged eggs, rather than a defence against parasitism. Finally, females with territories adjacent to their nest sites were parasitized as often as females with non-adjacent territories, indicating that site-specific territoriality in goldeneyes does not serve to guard nests from parasites.
I tested three hypotheses that have been proposed to explain parasitic behaviour. Brood parasites did not attempt to incubate clutches to which they had contributed, even when host females were experimentally removed from those nests. I therefore reject the hypothesis that brood parasitism is an inadvertent consequence of contests among females for the same nest site. In contrast, parasitic behaviour was more frequent in young females, and was strongly related to the availability of nest-sites. These results support the hypothesis that parasitic laying is a conditional strategy pursued by young females when nest-sites are limited. However, other evidence was consistent with the hypothesis that 'parasitic' and 'parental' behaviours are alternative tactics in a mixed strategy. Estimated lifetime reproductive success was nearly identical for the two groups of females, and the relative reproductive success of parasites was negatively frequency-dependent.
A simulation model incorporating the effects of both density-dependence and frequency-dependence resolved this paradox. The model revealed a density threshold below which frequency-dependence effects were negligible, but above which frequency-dependence played a prominent role. I show that results consistent with both hypotheses are possible when the effects of population density are included. Current theories for the evolution of alternative reproductive tactics focus primarily on the frequency-dependent components of fitness and ignore the effects of population density. My results indicate that density-dependence and frequency-dependence can interact in an unanticipated way to maintain alternative nesting tactics in goldeneyes.Science, Faculty of
Zoology, Department of
Graduate
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Burgham, Mark Colin John. "The impact of brood parasitism by the brown-headed cowbird on the reproductive tactics of the yellow warbler." Thesis, University of Ottawa (Canada), 1985. http://hdl.handle.net/10393/5043.
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Cheng, Becky. "The Role of the Dosage Compensation Complex as a Pathway for Spiroplasma to Induce Male Lethality in Drosophila melanogaster." Scholarship @ Claremont, 2017. http://scholarship.claremont.edu/cmc_theses/1540.
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Drosophila melanogaster and many other insects harbor intracellular bacterial symbionts that are transmitted vertically from infected host mothers to their offspring. Many of these bacteria alter host reproductive developmental processes in order to increase their transmission success. For example, Spiroplasma, a spirochete that naturally infects D. melanogaster, selectively kills males during mid-embryogenesis while sparing females. Previous studies suggested that Spiroplasma interacts genetically with the male-specific dosage compensation pathway, which causes ~2-fold up-regulation of most genes located on the male’s single X chromosome so that their expression matches the levels found in females who have two Xs. To further test this idea, I used confocal microscopy to visualize dosage compensation complex (DCC) localization and activity in infected as well as uninfected embryos. In the presence of Spiroplasma, the DCC became abnormally mis-localized across the nucleus. This pattern was accompanied by abnormal acetylation of histone H4K16, a mark induced by DCC activity and needed for proper X chromatin remodeling. My results imply that Spiroplasma directly targets the DCC by misdirecting it to uncompensated regions of the genome, an effect that leads to abnormal gene mis-regulation and consequent lethality (work from other members in our group). To further investigate this interaction, we transgenically expressed low levels of MSL-2 in both Spiroplasma infected and uninfected embryos in order to cause ectopic formation of the DCC in the female sex. I found that when infected, female embryos expressing the DCC showed significantly reduced viability in comparison to uninfected transgenic females. This result supports the notion that Spiroplasma uses the DCC in a dominant gain-of-function manner to kill embryos.
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Ferrer, Maza Dolors. "Effects of parasitism on the condition and reproductive capacity of three commercially exploited fish species in the Mediterranean Sea." Doctoral thesis, Universitat de Girona, 2016. http://hdl.handle.net/10803/385347.
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This PhD thesis evaluates the links between parasitism, condition and reproduction of mature female individuals of three of the most captured fish species in the western Mediterranean Sea: European hake, Merluccius merluccius; red mullet, Mullus barbatus, and European anchovy, Engraulis encrasicolus. Indicators of fish energy reserves (total lipid content in liver, muscle and gonads) and reproductive capacity (fecundity and egg quality) were evaluated, as were the prevalence and intensity of infection by metazoan parasites. By evaluating these relationships, this thesis also provides essential data on the health and reproduction of these three fish species, such as the spawning strategy.La present tesi doctoral avalua els vincles entre parasitisme, condició i reproducció en femelles adultes de tres de les espècies més capturades a la Mediterrània occidental: el lluç europeu, Merluccius merluccius; el roger de fang, Mullus barbatus, i el seitó, Engraulis encrasicolus. Amb aquesta finalitat, es varen avaluar els indicadors de les reserves energètiques (contingut total de lípids en el fetge, musculatura i gònades) i la capacitat reproductiva (fecunditat i qualitat de la posta), així com la prevalença i intensitat de la infestació per paràsits metazous.Paral·lelament a l’anàlisi d’aquestes relacions, aquesta tesi també proporciona dades essencials sobre la salut i reproducció d’aquestes tres espècies, com per exemple l’estratègia reproductiva.
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Serrat, Llinàs Alba. "Reproductive and condition status of “cold water” marine fish: new insights from a changing environment." Doctoral thesis, Universitat de Girona, 2019. http://hdl.handle.net/10803/667412.
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Exploited marine fish species with an affinity for cold waters inhabiting close to the warmer edge of their distribution area are exposed to stress caused by fishing and climate change. Three case studies of “cold water species” were selected (Argentina sphyraena, Micromesistius poutassou and Merluccius merluccius) and, in each case, various biological traits – including the factors regulating early oogenesis, reproductive tactics, physical condition, parasitism and energy allocation trade-offs – were examined. Overall, the main findings support the idea that species-specific biological traits and plasticity influence population’s sensitivity and response to external stressors. This thesis contributes to the improvement of egg production estimation methods and to the understanding of fundamental biological mechanisms and their variabilityLes espècies comercials de peixos marins amb preferència per a aigües fredes, que viuen a l’hemisferi nord properes al límit sud de la seva àrea de distribució, es troben en una situació vulnerable degut al canvi climàtic i a la sobrepesca. Aquesta tesi es centra en tres “espècies d’aigua freda”: el moixó (Argentina sphyraena), la maire (Micromesistius poutassou) i el lluç (Merluccius merluccius). Per tal de completar el coneixement sobre les seves característiques reproductives i avaluar el seu estat de salut, es van escollir tres especies d’aigua freda (el moixó, Argentina sphyraena; la maire, Micromesistius poutassou; i el lluç, Merluccius merluccius) i es van examinar diferents trets biològics que comprenen des dels factors que regulen les etapes més inicials de la ovogènesi fins a diverses característiques reproductives, així com l’estat de condició, el parasitisme i els balanços en la distribució de l’energia interna
Books on the topic "Reproductive parasitism"
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Trade-offs between life history traits and immune defence in the collared flycatcher, Ficedula albicollis. Uppsala: [Uppsala University], 1998.
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White, Marie E. Aspects of reproduction, larval development, and morphometrics in the pyramidellid Boonea impressa (=Odostomia impressa) (Gastropoda: Opisthobranchia). College Station, Tex: Sea Grant College Program, Texas A & M University, 1985.
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Cavaciocchi, Simonetta, ed. Le interazioni fra economia e ambiente biologico nell'Europa preindustriale secc. XIII-XVIII. Economic and biological interactions in pre-industrial Europe from the 13th to the 18th centuries. Florence: Firenze University Press, 2010. http://dx.doi.org/10.36253/978-88-8453-596-2.
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Pests, parasites and pathogenic agents have exerted a notable influence on the process of economic development of pre-industrial Europe, in view of their influence on the health, longevity and reproduction of human beings, plants and animals. On each occasion man has reacted to biological uncertainty with responses that were public or private, formal or informal and differed in both efficacy and cost. Success has always been partial, and dependent on experience, knowledge and the investment of economic resources. These reciprocal influences have never been allocated an appropriate or convincing place in the institutional model or those of Smith, Malthus, Ricardo or Marx, typically exploited to describe and explain the flux and reflux of the economic development of pre-industrial Europe. In these proceedings of Study Week promoted by the Fondazione Datini, the leading experts in the sector have undertaken to analyse, exemplify and discuss the precise nature of the complex interactions between economic and biological processes and agents. Adopying a stimulating, innovative and interdisciplinary approach, they appraise the degree to which such processes acted in reciprocal independence, whether there was a significant co-evolution and what prospects there are for developing explanatory models that better grasp the essentially bilateral nature of such interactions.
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Forbes, Mark Randall Luke *. Parasites and reproductive success of male hosts: competing hypotheses and tests with "enallagma" damselflies and parasitic mites. 1991.
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Vogelnest, Larry, and Rupert Woods, eds. Medicine of Australian Mammals. CSIRO Publishing, 2008. http://dx.doi.org/10.1071/9780643097971.
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In Medicine of Australian Mammals, more than 30 experts present the most current information available on the medical management of all taxa of Australian native mammals.
This comprehensive text is divided into two parts. The first includes chapters on general topics relevant to the medical management of captive and free-ranging Australian native mammals such as: veterinary considerations for the rescue, treatment, rehabilitation and release of wildlife; veterinary aspects of hand-rearing orphaned marsupials; marine mammal strandings and the role of the veterinarian; and wildlife health investigation and necropsy of Australian mammals. The second part covers the medicine of specific taxa of Australian native mammals. Detailed information on taxonomy, distribution, biology, anatomy, physiology, reproduction, husbandry, nutrition, physical and chemical restraint, clinical pathology, hand-rearing, diseases, zoonoses, therapeutics, reproductive management and surgery is included.
This practical, one-source reference is complemented by detailed photographs and illustrations, as well as tables listing reproductive and physiological data, diets, haematology and biochemistry values, and drug formularies. Appendices include a checklist of the mammals of Australia and its territories and a guide to the identification of common parasites of Australian mammals.
Medicine of Australian Mammals is clinically oriented and is a must-have for veterinary clinicians, no matter how experienced. The book will also be of use to veterinary students, researchers, biologists, zoologists, wildlife carers and other wildlife professionals.
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Association nationale de la protection des plantes (France), ed. Relations entre les traitements phytosanitaires et la reproduction des animaux: Colloque international, 25-26 avril 1990, Ministère de la recherche et de la technologie, Paris. [Paris]: ANPP, 1990.
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Breed, Bill, and Fred Ford. Native Mice and Rats. CSIRO Publishing, 2007. http://dx.doi.org/10.1071/9780643095595.
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Australia’s native rodents are the most ecologically diverse family of Australian mammals. There are about 60 living species – all within the subfamily Murinae – representing around 25 per cent of all species of Australian mammals. They range in size from the very small delicate mouse to the highly specialised, arid-adapted hopping mouse, the large tree rat and the carnivorous water rat.
Native Mice and Rats describes the evolution and ecology of this much-neglected group of animals. It details the diversity of their reproductive biology, their dietary adaptations and social behaviour. The book also includes information on rodent parasites and diseases, and concludes by outlining the changes in distribution of the various species since the arrival of Europeans as well as current conservation programs.
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Cottle, David, and Lewis Kahn, eds. Beef Cattle Production and Trade. CSIRO Publishing, 2014. http://dx.doi.org/10.1071/9780643109896.
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Beef Cattle Production and Trade covers all aspects of the beef industry from paddock to plate. It is an international text with an emphasis on Australian beef production, written by experts in the field.
The book begins with an overview of the historical evolution of world beef consumption and introductory chapters on carcass and meat quality, market preparation and world beef production. North America, Brazil, China, South-East Asia and Japan are discussed in separate chapters, followed by Australian beef production, including feed lotting and live export.
The remaining chapters summarise R&D, emphasising the Australian experience, and look at different production systems and aspects of animal husbandry such as health, reproduction, grazing, feeding and finishing, genetics and breeding, production efficiency, environmental management and business management.
The final chapter examines various case studies in northern and southern Australia, covering feed demand and supply, supplements, pasture management, heifer and weaner management, and management of internal and external parasites.
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Haspert, Beth. Metronidazole Flagyl: The Powerful Antibiotic That Eliminates Bacterial and Parasitic Infections from the Vagina, Reproductive System, Brain, Blood, Stomach, Liver, Joints, Skin, and Respiratory Tract. Independently Published, 2018.
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Halliday, RB, DE Walter, H. Proctor, RA Norton, and M. Colloff, eds. Acarology. CSIRO Publishing, 2001. http://dx.doi.org/10.1071/9780643069800.
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Acarology: Proceedings of the 10th International Congress is a timely overview of the current international research mites and ticks. The outcome of a conference of leading acarologists, it presents major reviews of all current areas of research including:
advances in acarine biodiversity and systematics
human and livestock diseases transmitted by ticks and other parasitic mites
interactions between mites and their food plants
mites as biological control agents
use of genetic markers in mite population studies
mites as bioindicators
ecology and biology of soil mites
mite evolutionary ecology and reproduction
advances in acarine diversity and systematics
The 90 papers in the book represent some of the best research from leading international researchers from over 50 countries, and helps to establish priorities for future research. All papers have been peer reviewed and edited.
Acarology is a comprehensive and important addition to the world literature on mites, and is an essential addition to all acarological and entomological reference collections.
Book chapters on the topic "Reproductive parasitism"
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Yom-Tov, Yoram, and Eli Geffen. "Conspecific Brood Parasitism Among Birds: The Effects of Phylogeny, Mode of Reproduction and Geographic Distribution." In Avian Brood Parasitism, 95–103. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-73138-4_5.
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Hurd, Hilary, and Tracey Webb. "The Role of Endocrinological Versus Nutritional Influences in Mediating Reproductive Changes in Insect Hosts and Insect Vectors." In Parasites and Pathogens, 179–97. Boston, MA: Springer US, 1997. http://dx.doi.org/10.1007/978-1-4615-5983-2_9.
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Sikora, Richard A., Jon Padgham, and Johan Desaeger. "The unpredictability of adapting integrated nematode management to climate variability." In Integrated nematode management: state-of-the-art and visions for the future, 463–71. Wallingford: CABI, 2021. http://dx.doi.org/10.1079/9781789247541.0064.
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Abstract The areas of concern regarding the future importance of climate change and variability on nematode damage and integrated management include: shifts in the distribution of nematodes, stimulation of additional generations, increased reproductive potential, development of more severe nematode-pathogen complexes, inability to monitor with remote sensing populations over multiple seasons, negative yield due to nematodes and reduced soil moisture levels, adapting integrated nematode management (INM) to highly volatile interannual fluctuations, loss of organic matter and soil antagonistic potential, lack of an effective in-season plant curative pesticide, enhancement of cumulative multi-species impact, and inactivation or loss of plant resistance to nematodes. This chapter reflects on some of the above points and how long-term climate change and increasing climate variability may impact nematodes, crop losses and potential modification of INM under climate change induced risk. It discusses climate change and climate variability in the context of INM, climate impacts on agricultural crops, critical climate change hotspots, climate influence on nematode biological processes, and the use of degree-days to monitor temperature effects on nematode development. The use of plant parasitic nematodes as research models and immediate priorities for improved near-term climate risk management within INM are also described.
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Honor, Richard, and Robert I. Colautti. "EICA 2.0: a general model of enemy release and defence in plant and animal invasions." In Plant invasions: the role of biotic interactions, 192–207. Wallingford: CABI, 2020. http://dx.doi.org/10.1079/9781789242171.0192.
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Abstract Plants and animals have evolved a variety of strategies to limit the negative fitness consequences of natural enemies (i.e. herbivores, predators, parasites and pathogens). Demographic bottlenecks occurring during the invasion process reduce the number of co-introduced natural enemies, providing opportunities to study rapid evolution in environments with different or reduced enemy loads. Enemy release theory provides a set of hypotheses and predictions about the role of natural enemies in the proliferation of invasive species. This body of theory includes the Enemy Release Hypothesis (ERH) and the related Evolution of Increased Competitive Ability Hypothesis (EICA), but there is often confusion about these hypotheses and the data needed to test them. We introduce a simple, general model of enemy release to identify and clarify some of the key assumptions and predictions implicit in enemy release theory and its impacts on invasion. Although introduced populations likely benefit from a reduction in the direct fitness impacts of natural enemies in the early stages of invasion, an evolutionary shift in resource allocation from defence to growth and reproduction is much less likely and depends on a delicate balance between the fitness costs and benefits of defence and the fitness impacts of natural enemies in both the native and introduced ranges. Even when the abundance of natural enemies is lower in the introduced range, the majority of scenarios do not favour evolution of less defended genotypes that are more competitive or more fecund, contrary to predictions of EICA. Perhaps surprisingly, we find that the level of damage by natural enemies in field surveys is not generally a good parameter for testing enemy release theory. Instead, common garden experiments characterizing fitness reaction norms of multiple genotypes from the native and introduced range are crucial to estimate the historic rate of adaptive evolution or predict it into the future. Incorporating spatial autocorrelation and methods from population genetics can further improve our understanding of the role of enemy release and evolution in the proliferation of invasive species.
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Gorbunov, Alexander K., Boris V. Fiks, and Victor R. Alekseev. "Use of the Simulation Model for the Analysis of the Impact of Parasites on the Dynamics of Abundance, Reproduction, and the Transition to Diapause in the Mass Rotifers Brachionus calyciflorus Pallas of the Volga Delta." In Dormancy in Aquatic Organisms. Theory, Human Use and Modeling, 259–69. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-21213-1_16.
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Dunn, Alison M., Thierry Rigaud, and Alex T. Ford. "Environmental Influences on Crustacean Sex Determination and Reproduction: Environmental Sex Determination, Parasitism, and Pollution." In Reproductive Biology, 394–428. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190688554.003.0014.
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This chapter reviews the influences of environmental factors on sex determination, sex ratios, and reproductive behavior in the Crustacea, focusing in particular on amphipod and isopod examples. A range of abiotic and biotic environmental factors influence reproduction in Crustacea, including temperature, day length, pollutants, and parasites. Individual crustaceans may benefit from these environmental influences, but in other cases, reproductive biology responses to biotic and abiotic environments may be detrimental to individual fitness. Environmental Sex Determination (ESD) falls into the former category. ESD is an adaptive mechanism of sex determination that is rare, but has evolved in diverse taxa. Evidence from gammarid amphipods is used to explore the evolution of ESD in response to a patchy environment. While ESD is an adaptive mechanism of sex determination, the impact of other environmental factors can be very costly. Parasitic castrators can lead to a reduction or total cessation of reproduction in crustacean hosts, driving population declines. In contrast, parasitic feminizers convert male hosts into females, enhancing maternal parasite transmission but also leading to sex ratio distortion in the host population. The chapter discusses parasite-host coevolutionary conflict and reviews evidence that selection on the host in response to parasitic sex ratio distortion has led to altered mate choice in amphipods, and to the evolution of a novel system of sex determination in isopods. Human-induced environmental influences can also be seen in Crustacea, and the chapter discusses how parasites, ESD, and endocrine-disrupting chemicals can each affect sex determination and lead to abnormal intersex phenotypes. It ends by highlighting areas for future research on the diverse world of crustacean reproduction.
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Benvenuto, Chiara, and Stephen C. Weeks. "Hermaphroditism and Gonochorism." In Reproductive Biology, 197–241. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190688554.003.0008.
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This chapter compares two sexual systems: hermaphroditism (each individual can produce gametes of either sex) and gonochorism (each individual produces gametes of only one of the two distinct sexes) in crustaceans. These two main sexual systems contain a variety of alternative modes of reproduction, which are of great interest from applied and theoretical perspectives. The chapter focuses on the description, prevalence, analysis, and interpretation of these sexual systems, centering on their evolutionary transitions. The ecological correlates of each reproductive system are also explored. In particular, the prevalence of “unusual” (non-gonochoristic) reproductive strategies has been identified under low population densities and in unpredictable/unstable environments, often linked to specific habitats or lifestyles (such as parasitism) and in colonizing species. Finally, population-level consequences of some sexual systems are considered, especially in terms of sex ratios. The chapter aims to provide a broad and extensive overview of the evolution, adaptation, ecological constraints, and implications of the various reproductive modes in this extraordinarily successful group of organisms.
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Harper, Steven J., and James D. Westervelt. "Management Application of an Agent-Based Model: Control of Cowbirds at the Landscape Scale." In Integrating Geographic Information Systems and Agent-Based Modeling Techniques for Understanding Social and Ecological Processes. Oxford University Press, 2002. http://dx.doi.org/10.1093/oso/9780195143362.003.0011.
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Brood parasitism by brown-headed cowbirds (Molothrus ater) has negative impacts on a large number of songbird species. Cowbirds are obligate brood parasites, meaning that females lay their eggs in the nests of other species and do not provide care to their offspring. Parasitism by cowbirds often results in reduced reproductive success for the host, sometimes to the exclusion of fledging any of their own young. Clearly parasitism by cowbirds can have a substantial impact on the population dynamics of the host species. Over 200 species of birds are known to be parasitized by cowbirds. Cowbirds breed in shrublands and forests, and especially parasitize host nests located near ecotones, or borders between habitat types. Human land use in general may promote the success of cowbirds; landscapes with forest openings, clearcuts, small tracts of forests, and large amounts of habitat edge have higher parasitism rates than do landscapes with contiguous forest tracts. Cowbirds readily forage in feedlots, overgrazed pastures, and grasslands, and the expansion of agricultural land use over the past century has provided abundant feeding habitat for cowbirds. Large increases in the numbers of cowbirds have been documented and this increase has been implicated as one factor responsible for the decline of a large number of passerines. Compounding their impact is the fact that cowbirds can affect host populations over broad spatial scales. Because they do not protect their young or a nest, they can range large distances in search of suitable feeding areas; researchers have reported maximum daily movements from 7 to 13 km for cowbirds (Rothstein et al., Cook et al., respectively). At Fort Hood, a U.S. Army military installation located in central Texas, cowbirds parasitize the nests of numerous songbird species, including those of the black-capped vireo ( Vireo atricapillus) and the golden-cheeked warbler (Dendroica chrysoparia), two federally endangered species. The black-capped vireo appears to be particularly vulnerable to parasitism. Once her nest is parasitized, a host female often abandons it. The female may then attempt to renest but, when cowbirds are abundant, this nest is also likely to be parasitized.
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"Brood Parasitism in Birds." In Reproductive Biology and Phylogeny of Birds, Part B: Sexual Selection, Behavior, Conservation, Embryology and Genetics, 337–76. CRC Press, 2007. http://dx.doi.org/10.1201/9781482280517-12.
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"Early Life Stage Mortality Syndrome in Fishes of the Great Lakes and Baltic Sea." In Early Life Stage Mortality Syndrome in Fishes of the Great Lakes and Baltic Sea, edited by Leif Norrgren, Patric Amcoff, Hans Börjeson, and Per-Olov Larsson. American Fisheries Society, 1998. http://dx.doi.org/10.47886/9781888569087.ch2.
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<em>Abstract.—</em>Populations of Baltic salmon <em>Salmo salar </em>and cod <em>Gadus morhua </em>are facing acute threats because of poor reproduction. The salmon is afflicted with high yolk sac fry mortality, and the incidence of cod larvae mortality is high. There are also indications that anadromous Baltic brown trout <em>Salmo trutta </em>populations are affected by reproductive disorders. These top predators have significant ecological, economic, and socioeconomic importance. Other species are also suffering from poor reproductive success and declining populations. Burbot <em>Lota lota </em>populations are locally affected by inadequate sexual maturation, resulting in a failure to spawn; gonad anomalies have also been described in roach <em>Rutilus rutilus</em>. High egg mortality has been recorded for whiting <em>Merlangius merlangus</em>, flounder <em>Platichtys flesus</em>, and herring <em>Clupea harengus</em>. Attempts have been made to discover the cause of reproductive disorders in Baltic fish species, but the available data suggest several possible causes, both abiotic and biotic. Species with pelagic eggs such as cod and flatfish are dependent on salinity and oxygen concentrations, factors that often limit the volume of reproduction in the Baltic Sea. A variety of biotic causes (i.e., infectious diseases, parasitism, and toxic algae) have been shown to affect species such as roach and herring. There are indications that nutritional factors (i.e., thiamine and astaxanthin) are involved in the cause of the yolk sac fry mortality syndrome affecting the Baltic salmon. Furthermore, anthropogenic activities causing both local point sources (i.e., metals and persistent organic pollutants) and long-range transport and deposition of acidic rain and pesticides must also be considered as potential threats to Baltic fish species.
Conference papers on the topic "Reproductive parasitism"
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"PREVALENCE OF BACTERIAL AND PARASITIC URINARY TRACT INFECTION AMONG ASYMPTOMATIC FEMALES IN RURAL COMMUNITIES OF OGBOMOSO." In International Conference on Public Health and Humanitarian Action. International Federation of Medical Students' Associations - Jordan, 2022. http://dx.doi.org/10.56950/eklu3082.
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Urinary tract infection is one of the most important infection causing serious diseases in tropical and sub- tropical countries of Africa. Several factors have been associated with the high prevalence of urinary tract infections in Nigeria. This study was carried out to determine the urinary tract infection status among two hundred and forty (240) asymptomatic females over a period of six weeks (March to April 2022) among 240 females between the 20-50 years of age at Iluju and Saamo village, Ogbomoso, Oyo state, Nigeria. Two hundred and forty urine samples were collected from the females. The mid- stream urine samples collected were examined microscopically for the presence of parasites, after which they were cultured, biochemical findings and antimicrobial susceptibility tests were also carried out. Out of the 240 samples, only 1(0.4%) was found positive for parasitic infection. 34(14.2%) were found to harbour Escherichia coli, 18(7.5%) were positive for Proteus mirabilis, 8(3.3%) were infected by Klebsiella pneumonia, 45(18.8%) had Staphylococcus aureus. Prevalence was found to be higher in women of reproductive age 21-25years (78%) than women above 40years (10.5%). The antimicrobial suspectibility profile indicates that the fluoroquinlonones were the most active antibacterial agents followed by the aminoglycosides. Trimethorim, oxacillim, amoxicillin showed very poor activity. This may be due to long term use of these drugs. The socio- economic status as well as the hygiene practice of the women influence the prevalence of urinary tract infections. Most of the women 134(55.8%) were aware about Urinary tract infection and 106 (44.2%) were unaware. Thus, the high infection rate among asymptomatic females in these villages were due to poor hygiene, lack of good toilet facilities and poor socio- economic status. Keywords: Bacterial, Parasitic, Rural, Ogbomoso, Females, hygiene
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Cong, Bin. "Regulation of host reproduction by the endosymbiotic bacteriaWolbachiaand its role in the modification of parasitic natural enemy insects." In 2016 International Congress of Entomology. Entomological Society of America, 2016. http://dx.doi.org/10.1603/ice.2016.113404.
Full textReports on the topic "Reproductive parasitism"
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Werren, John H., Einat Zchori-Fein, and Moshe Coll. Parthenogenesis-Inducing Microorganisms in Parasitic Hymenoptera: Their Mode of Action and Utilization for Improvement of Biological Control Agents. United States Department of Agriculture, June 1996. http://dx.doi.org/10.32747/1996.7573080.bard.
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Wolbachia are intracellular bacteria known to cause reproductive and sex ratio disorders in many insects. In various parasitic Hymenoptera, Wolbachia induce thelytokous reproduction. The overall goal of this research was the improvement of biological control agents by reversion of their mode of reproduction. This was attempted from two directions: 1) studying the effect of naturally occurring Wolbachia on the thelytokous species Muscidifuraxuniraptor and 2) trying to transmit thelytoky-inducing Wolbachia to Nasoniavitripennis. In M. uniraptor, gamete duplication was found to be the mode of diploidy restoration and Wolbachia density had a strong effect on sex ratio but not on host fitness. Studies on the natural horizontal transmission of Wolbachia between Nasonia wasps and their Protocalliphora hosts using the Wolbachia Outer Surface Protein (WOSP) gene revealed that (a) two Nasonia species (N. giraulti and N. longicornis) possess closely related strains of B-group Wolbachia, but N. vitripennisapparently acquired B Wolbachia by horizontal transmission from an unknown source, (b) Nasonia and its Protocalliphora host have similar Wolbachia, and (c) the Protocalliphora Wolbachia WOSP gene is a recombinant between the one found in N. giraulti/longicornis and N. vitripennis. Results show parasitoid-host insect transmission of Wolbachia and recombination among Wolbachia strains. Results from gynandromorph studies suggest a novel mechanism of sex determination in Nasonia.
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Gottlieb, Yuval, Bradley Mullens, and Richard Stouthamer. investigation of the role of bacterial symbionts in regulating the biology and vector competence of Culicoides vectors of animal viruses. United States Department of Agriculture, June 2015. http://dx.doi.org/10.32747/2015.7699865.bard.
Full textAbstract:
Symbiotic bacteria have been shown to influence host reproduction and defense against biotic and abiotic stressors, and this relates to possible development of a symbiont-based control strategy. This project was based on the hypothesis that symbionts have a significant impact on Culicoides fitness and vector competence for animal viruses. The original objectives in our proposal were: 1. Molecular identification and localization of the newly-discovered symbiotic bacteria within C. imicola and C. schultzei in Israel and C. sonorensis in California. 2. Determination of the prevalence of symbiotic bacteria within different vector Culicoides populations. 3. Documentation of specific symbiont effects on vector reproduction and defense: 3a) test for cytoplasmic incompatibility in Cardinium-infected species; 3b) experimentally evaluate the role of the symbiont on infection or parasitism by key Culicoides natural enemies (iridescent virus and mermithid nematode). 4. Testing the role(s) of the symbionts in possible protection against infection of vector Culicoides by BTV. According to preliminary findings and difficulties in performing experimental procedures performed in other insect symbiosis systems where insect host cultures are easily maintained, we modified the last two objectives as follows: Obj. 3, we tested how symbionts affected general fitness of Israeli Culicoides species, and thoroughly described and evaluated the correlation between American Culicoides and their bacterial communities in the field. We also tried alternative methods to test symbiont-Culicoides interactions and launched studies to characterize low-temperature stress tolerances of the main US vector, which may be related to symbionts. Obj. 4, we tested the correlation between EHDV (instead of BTV) aquisition and Cardinium infection. Culicoides-bornearboviral diseases are emerging or re-emerging worldwide, causing direct and indirect economic losses as well as reduction in animal welfare. One novel strategy to reduce insects’ vectorial capacity is by manipulating specific symbionts to affect vector fitness or performance of the disease agent within. Little was known on the bacterial tenants occupying various Culicoides species, and thus, this project was initiated with the above aims. During this project, we were able to describe the symbiont Cardinium and whole bacterial communities in Israeli and American Culicoides species respectively. We showed that Cardinium infection prevalence is determined by land surface temperature, and this may be important to the larval stage. We also showed no patent significant effect of Cardinium on adult fitness parameters. We showed that the bacterial community in C. sonorensis varies significantly with the host’s developmental stage, but it varies little across multiple wastewater pond environments. This may indicate some specific biological interactions and allowed us to describe a “core microbiome” for C. sonorensis. The final set of analyses that include habitat sample is currently done, in order to separate the more intimately-associated bacteria from those inhabiting the gut contents or cuticle surface (which also could be important). We were also able to carefully study other biological aspects of Culicoides and were able to discriminate two species in C. schultzei group in Israel, and to investigate low temperature tolerances of C. sonorensis that may be related to symbionts. Scientific implications include the establishment of bacterial identification and interactions in Culicoides (our work is cited in other bacteria-Culicoides studies), the development molecular identification of C. schultzei group, and the detailed description of the microbiome of the immature and matched adult stages of C. sonorensis. Agricultural implications include understanding of intrinsic factors that govern Culicoides biology and population regulation, which may be relevant for vector control or reduction in pathogen transmission. Being able to precisely identify Culicoides species is central to understanding Culicoides borne disease epidemiology.