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Journal articles on the topic 'Egg-bearing female'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Ohba, Shin-ya, Noboru Okuda, and Shin-ichi Kudo. "Sexual selection of male parental care in giant water bugs." Royal Society Open Science 3, no. 5 (2016): 150720. http://dx.doi.org/10.1098/rsos.150720.

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Paternal care can be maintained under sexual selection, if it helps in attracting more mates. We tested the hypothesis in two giant water bug species, Appasus major and Appasus japonicus , that male parental care is sexually selected through female preference for caring males. Females were given an opportunity to choose between two males. In the first test of female mate choice, one male carried eggs on its back, while the other did not. The egg status was switched between these two males in the second test. The experiment revealed that females of both species preferred caring males (i.e. egg-

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2

Keller, Claudia. "Assessment of reproductive state in the turtle Mauremys leprosa: a comparison between inguinal palpation and radiography." Wildlife Research 25, no. 5 (1998): 527. http://dx.doi.org/10.1071/wr97013.

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Inguinal palpation and radiography were carried out simultaneously on a sample of 387 adult female Mediterranean turtles, Mauremys leprosa, to assess the presence of calcified oviductal eggs. A significantly higher frequency of pregnant females was obtained through radiography. Egg-bearing females (as shown on radiographs) with positive palpation tended to have significantly larger clutches than did females with negative palpation. Clutches in the earlier calcification stages were less likely to be detected by palpation than were more calcified eggs. The frequency of positive palpations of egg

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3

Lyons, D. O., and J. J. Dunne. "Inter- and intra-gender analyses of feeding ecology of the worm pipefish (Nerophis lumbriciformis)." Journal of the Marine Biological Association of the United Kingdom 84, no. 2 (2004): 461–64. http://dx.doi.org/10.1017/s0025315404009452h.

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Small vagile epiphytic crustaceans formed the greatest proportion of the diet of worm pipefish. There were significant differences in the number (Mann–Whitney U=22006·5, P<0·001) and diversity (Mann–Whitney U=11546·0, P<0·05) of prey consumed by male and female pipefish. Harpacticoid copepods are the most numerically dominant form of prey consumed. Further gender analysis of mature pipefish revealed that reproductively mature females and egg-bearing male worm pipefish show significantly greater predatory effort (Kruskal–Wallis H=24·15, df=2, P<0·001). Increased feeding activity, withi

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4

Al-Marzouqi, Abdulaziz, Johan C. Groeneveld, Abdullah Al-Nahdi, and Ahmed Al-Hosni. "Reproductive Season of the Scalloped Spiny Lobster Panulirus homarus Along the Coast of Oman: Management Implications." Journal of Agricultural and Marine Sciences [JAMS] 13 (January 1, 2008): 33. http://dx.doi.org/10.24200/jams.vol13iss0pp33-42.

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The spiny lobster Panulirus homarus is widely distributed in the Indo-West Pacific. Along the coast of Oman it supports an artisanal fishery using traps and tangle nets. The egg-bearing incidence of females caught between 1989 and 2006 were analysed relative to month, lobster size and location of capture. The smallest female with external eggs had a carapace length (CL) of 54.6 mm, but only 9–18% of females of 60–69 mm CL carried eggs. This percentage increased significantly above 70 mm CL, and on average, 63% of individuals >90 mm carried eggs. Egg-bearing increased seasonally at the onset

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5

Zimmermann, Uwe, Fabrício Lopes Carvalho, and Fernando L. Mantelatto. "The reproductive performance of the Red-Algae shrimp Leander paulensis (Ortmann, 1897) (Decapoda, Palaemonidae) and the effect of post-spawning female weight gain on weight-dependent parameters." Brazilian Journal of Oceanography 63, no. 3 (2015): 207–16. http://dx.doi.org/10.1590/s1679-87592015085806303.

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AbstractDecapod species have evolved with a variety of reproductive strategies. In this study reproductive features of the palaemonid shrimp Leander paulensiswere investigated. Individuals were collected in the coastal region of Ubatuba, São Paulo, Brazil. In all, 46 ovigerous females were examined in terms of the following reproductive traits: fecundity, reproductive output, brood loss and egg volume. Leander paulensis produces a large number of small eggs with an average fecundity of 635 ± 246 eggs. Egg volume increased significantly from early (0.034 ± 0.008 mm3) to late development stage (

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MAZLUM, Yavuz, and Mehmet Fatih CAN. "Causal relationships among the body-related and egg-related traits in crayfish: A case study on Turkish freshwater crayfish Pontastacus leptodactylus (Astacidae: Decapoda)." Journal of Biometry Studies 4, no. 2 (2024): 56–66. https://doi.org/10.61326/jofbs.v4i2.01.

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In this study, the direct and indirect causal relationships among the length, weight, egg diameter, egg weight, and egg quantity of female Pontastacus leptodactylus were analyzed using a path analysis. A total of 79 egg-bearing female crayfish with a total weight (WT; 39.1 ± 16 g) and total length (TL; 109.6 ± 18.1 mm), were sampled from Eğirdir Lake, Türkiye, in 2022 and 2023. Significant direct effects were observed several traits, such as crayfish length and weight, weight and egg diameter, length and egg quantity, egg diameter and egg quantity, weight and egg quantity, length and egg weigh

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7

Sumpton, WD, MA Potter, and GS Smith. "Parasitism of the commercial sand crab Portunus pelagicus (L.) by the rhizocephalan Sacculina granifera Boschma, 1973 in Moreton Bay, Queensland, Australia." Marine and Freshwater Research 45, no. 2 (1994): 169. http://dx.doi.org/10.1071/mf9940169.

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In Moreton Bay, Queensland, externae of Sacculina granifera Boschma were found in 7.0% of adult males and 123% of adult females of Portunus pelagicus. Infection rates were seasonal for both sexes and higher in the adult female population, with more than 20% of adult females carrying externae during some summer months. Infection rates were less than 3% in areas outside the bay and generally highest in the southern and central bay. Nineteen males and 15 females had abdominal scars where externae had become dislodged. The gonads of most parasitized crabs were underdeveloped, but 5.6% of externa-b

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Templeton, A. R., H. Hollocher, and J. S. Johnston. "The molecular through ecological genetics of abnormal abdomen in Drosophila mercatorum. V. Female phenotypic expression on natural genetic backgrounds and in natural environments." Genetics 134, no. 2 (1993): 475–85. http://dx.doi.org/10.1093/genetics/134.2.475.

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Abstract The abnormal abdomen (aa) syndrome in Drosophila mercatorum depends on the presence of R1 inserts in a third or more of the X-linked 28S rDNA genes and the absence of selective underreplication of inserted repeats in polytene tissues that is controlled by an X-linked locus (ur) half a map unit from the rDNA complex. This syndrome affects both life history and morphology in the laboratory. Because abnormal morphologies are rarely encountered in nature, the purpose of this study is to see if the female life history traits are still affected under more natural genetic backgrounds and env

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9

Tang, Feng, Marthe Larsen Haarr, Bernard Sainte-Marie, et al. "Spatio-temporal patterns and reproductive costs of abnormal clutches of female American lobster, Homarus americanus, in eastern Canada." ICES Journal of Marine Science 75, no. 6 (2018): 2045–59. http://dx.doi.org/10.1093/icesjms/fsy076.

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Abstract Previous studies have documented female American lobster, Homarus americanus, carrying “abnormal clutches”, i.e. with eggs covering less than half of their abdomen. From 2011 to 2014, we worked alongside harvesters to quantify spatio-temporal patterns and reproductive costs of abnormal clutches among 138 738 egg-bearing female lobsters sampled from 193 homeports spread across eastern Canada. Females with abnormal clutches were ubiquitous, being found in 90% of homeports. Their incidence was, however, relatively low, averaging 6% across sampling times and locations. The incidence decre

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10

Bhaduri, Ritindra N. "Infections by the trematode Microphallus nicolli and the acanthocephalan Profilicollis altmani in relation to the reproductive condition of their intermediate host, the Pacific mole crab Emerita analoga." Animal Biology 70, no. 4 (2020): 417–25. http://dx.doi.org/10.1163/15707563-bja10038.

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Abstract Parasites can dramatically influence fecundity of their hosts, so for any host species it is important to establish whether parasite infections affect host reproduction. The Pacific mole crab, Emerita analoga, commonly harbors metacercarial cysts of the trematode Microphallus nicolli and cystacanths of the acanthocephalan Profilicollis altmani. Although these helminths are known to infect primarily larger female mole crabs, they may do so disproportionately when tied to their host’s reproductive condition. This study was undertaken to examine differences in parasite prevalence and abu

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Hernáez, Patricio, Betel Martínez-Guerrero, Arthur Anker, and Ingo S. Wehrtmann. "Fecundity and effects of bopyrid infestation on egg production in the Caribbean sponge-dwelling snapping shrimpSynalpheus yano(Decapoda: Alpheidae)." Journal of the Marine Biological Association of the United Kingdom 90, no. 4 (2009): 691–98. http://dx.doi.org/10.1017/s0025315409991093.

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SeveralSynalpheusspecies have been reported as hosts of bopyrid parasites; however, the impact of infestation on egg production is still unknown. Therefore, the present work studied reproductive aspects and the effect of parasitism on fecundity of the alpheid shrimpSynalpheus yanofrom Bocas del Toro, Caribbean coast of Panama. Un-infested females (N = 84) ranging from 3.7 to 9.6 mm carapace length, produced between 5 and 246 eggs (average: 98±64.6), and egg number increased significantly with female size. The eggs were relatively large (0.6–1.3 mm in diameter), but within the range of otherSyn

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Landers Jr, Donald F., Milan Keser, and Saul B. Saila. "Changes in female lobster (Homarus americanus) size at maturity and implications for the lobster resource in Long Island Sound, Connecticut." Marine and Freshwater Research 52, no. 8 (2001): 1283. http://dx.doi.org/10.1071/mf01045.

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Population theory predicts that, under conditions of high age/size-specific mortality rates, individuals in highly exploited populations increase their fitness by decreasing size at sexual maturity, relative to less exploited populations. The benefit of early reproductive maturation is that individuals have a higher probability of surviving to maturity and contributing progeny to maintain the population. Empirical evidence, based on morphometric data from nearly 60 000 female lobsters collected since 1981, suggests that size at sexual maturity of female lobsters in Long Island Sound (USA) has

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LIMA, Jô de Farias, Mayara Cristina Moura DA CRUZ, and Luis Mauricio Abdon da SILVA. "Reproductive biology of Macrobrachium surinamicum (Decapoda: Palaemonidae) in the Amazon River mouth." Acta Amazonica 45, no. 3 (2015): 299–306. http://dx.doi.org/10.1590/1809-4392201402824.

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Macrobrachium surinamicum is an indigenous prawn distributed from the lower Amazon and Tocantins river basins to Venezuela in the Orinoco Delta region. It is common bycatch fauna of Macrobrachium amazonicum artisan fishing in the states of Pará and Amapá. The aim of this study was to investigate aspects on reproductive biology (reproductive period, size of sexual maturity population, fecundity, reproductive output and recruitment) of M. surinamicum from four important areas to artisanal prawn fishing located at the Amazon River mouth (Amapá and Pará). The specimens were captured using 20 handc

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14

Finnegan, Sam Ronan, Nathan Joseph White, Dixon Koh, M. Florencia Camus, Kevin Fowler, and Andrew Pomiankowski. "Meiotic drive reduces egg-to-adult viability in stalk-eyed flies." Proceedings of the Royal Society B: Biological Sciences 286, no. 1910 (2019): 20191414. http://dx.doi.org/10.1098/rspb.2019.1414.

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A number of species are affected by Sex-Ratio (SR) meiotic drive, a selfish genetic element located on the X-chromosome that causes dysfunction of Y-bearing sperm. SR is transmitted to up to 100% of offspring, causing extreme sex ratio bias. SR in several species is found in a stable polymorphism at a moderate frequency, suggesting there must be strong frequency-dependent selection resisting its spread. We investigate the effect of SR on female and male egg-to-adult viability in the Malaysian stalk-eyed fly, Teleopsis dalmanni . SR meiotic drive in this species is old, and appears to be broadl

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15

Kumar, Martin S., Yongshun Xiao, Sonja Venema, and Graham Hooper. "Reproductive cycle of the blue swimmer crab, Portunus pelagicus, off southern Australia." Journal of the Marine Biological Association of the United Kingdom 83, no. 5 (2003): 983–94. http://dx.doi.org/10.1017/s0025315403008191h.

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The proportion of berried (externally egg-bearing) females, fecundity, gonadosomatic index, and egg size of the blue swimmer crab Portunus pelagicus off southern Australia were examined by analysing data from samples of commercial catches using generalized linear models. Ovarian development was studied morphologically and histologically. Female blue swimmer crabs spawn from October to January and can spawn more than once per season. The fecundity of female blue swimmer crabs initially increased with carapace width, maximized at a carapace width of 134 mm, and decreased thereafter. Thus, fecund

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16

Buys, Sandor C. "Nesting behaviour and larval biology of Prionyx fervens (Linnaeus) (Hymenoptera, Sphecidae) from Brazil." Revista Brasileira de Zoologia 23, no. 2 (2006): 311–13. http://dx.doi.org/10.1590/s0101-81752006000200001.

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The nesting behaviour of Prionyx fervens (Linnaeus, 1758) is described, based on one nesting female observed in a coastal environment from southeastern Brazil. One prey bearing a wasp's egg was created in laboratorial conditions and aspects of the larval behaviour and development are described. Schistocerca cancellata (Serville, 1838) (Caelifera, Acrididae) was found as prey.

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17

Tomita, Taketeru, Minoru Toda, Keiichi Ueda, Senzo Uchida, and Kazuhiro Nakaya. "Live-bearing manta ray: how the embryo acquires oxygen without placenta and umbilical cord." Biology Letters 8, no. 5 (2012): 721–24. http://dx.doi.org/10.1098/rsbl.2012.0288.

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We conducted an ultrasonographic experiment on a pregnant manta ray, Manta alfredi (Chondrichthyes, Batoidea). This study showed how the embryo of the live-bearing elasmobranchs respires in the body of the female. In the embryonic stage, the manta ray embryo takes in uterine fluid by buccal-pumping. After birth, the manta ray shifts its respiratory mode from buccal-pumping to ram-ventilation. The rapid reduction of the spiracle size in the young manta ray may reflect this shift of respiratory mode. Unlike mammals or some carcharhinid sharks that acquire oxygen through a placenta and umbilical

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18

Stefanov, Tihomir. "Recent expansion of the alien invasive blue crab Callinectes sapidus (Rathbun, 1896) (Decapoda, Crustacea) along the Bulgarian coast of the Black Sea." Historia naturalis bulgarica 42, no. 7 (2021): 49–53. http://dx.doi.org/10.48027/hnb.42.072.

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Thirteen new records of the blue crab Callinectes sapidus (Rathbun, 1896) have been documented near the Bulgarian Black Sea coast since 2006. This is an evidence for a recent expansion of the species in this part of the Black Sea. This expansion could be explained by the existing of established population in the area and is confirmed by the capturing of an egg-bearing female in the Varna Bay in 2005.

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Stefanov, Tihomir. "Recent expansion of the alien invasive blue crab Callinectes sapidus (Rathbun, 1896) (Decapoda, Crustacea) along the Bulgarian coast of the Black Sea." Historia naturalis bulgarica 42 (April 26, 2021): 49–53. https://doi.org/10.48027/hnb.42.072.

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Thirteen new records of the blue crab Callinectes sapidus (Rathbun, 1896) have been documented near the Bulgarian Black Sea coast since 2006. This is an evidence for a recent expansion of the species in this part of the Black Sea. This expansion could be explained by the existing of established population in the area and is confirmed by the capturing of an egg-bearing female in the Varna Bay in 2005.

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Lima, Jô de Farias, Luis Mauricio Abdon da Silva, Thibério Carvalho da Silva, Jamile da Silva Garcia, Ilana da Silva Pereira, and Karlia Dalla Santa Amaral. "Reproductive aspects of Macrobrachium amazonicum (Decapoda: Palaemonidae) in the State of Amapá, Amazon River mouth." Acta Amazonica 44, no. 2 (2014): 245–54. http://dx.doi.org/10.1590/s0044-59672014000200010.

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Macrobrachium amazonicum is an indigenous prawn vastly distributed in basins of South America, widely exploited by artisanal fisheries in northern and northeastern Brazil and, with great potential for aquaculture. This study aimed to investigate general aspects of population structure and reproductive characteristics (size at first maturity, fecundity and reproductive output) of M. amazonicum from two important areas to artisanal prawn fishing located at the mouth of the Amazon River, State of Amapá. The specimens were captured using 20 handcrafted traps called "matapi". A number of 5,179 praw

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Litulo, Carlos. "Reproductive biology of the hairy crab Pilumnus vespertilio (Brachyura: Pilumnidae) in the East African region." Journal of the Marine Biological Association of the United Kingdom 85, no. 4 (2005): 877–81. http://dx.doi.org/10.1017/s0025315405011835.

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Reproductive patterns such as gonad maturation, production and release of gametes, fecundity and moulting play a major role in the continuity of populations and their adaptations to the environment they inhabit. The present study assesses the breeding cycle, moult activity and egg production in the hairy crab Pilumnus vespertilio, a typical inhabitant of intertidal pebble and rocky substrates of East African coasts. A total of 930 crabs was collected between January and December 2002 at Inhaca Island, southern Mozambique. Both oogenesis and spermatogenesis exhibit a continuous and synchronized

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Makaranka, A. I. "PARAMETERS OF THE FECUNDITY OF AMPHIPOD CRUSTACEAN ALIEN SPECIES (CRUSTACEA, AMPHIPODA) FROM WATERCOURSES OF BELARUS." Proceedings of the National Academy of Sciences of Belarus, Biological Series 63, no. 3 (2018): 365–73. http://dx.doi.org/10.29235/1029-8940-2018-63-3-365-373.

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For the first time for water bodies of Belarus, based on studies (2008–2015), the main fertility parameters for eight alien species of amphipods were established . The minimum sizes of individuals for which identification of sex and the size of sexual maturation is possible are presented. The ranges of the body length of the egg-bearing females and the average sizes of the breeding individuals were determinate. The sizes and number of eggs are given at three stages of development for females of different age groups. Absolute and relative fertility were revealed. It is established that the numb

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Galipaud, Matthias, François-Xavier Dechaume-Moncharmont, Abderrahim Oughadou, and Loïc Bollache. "Does foreplay matter? Gammarus pulex females may benefit from long-lasting precopulatory mate guarding." Biology Letters 7, no. 3 (2010): 333–35. http://dx.doi.org/10.1098/rsbl.2010.0924.

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Precopulatory mate guarding (PCMG) is generally assumed to be costly for both sexes. However, males may gain by displaying long-lasting mate guarding under strong male–male competition. Surprisingly, the potential for females to benefit from being held by males has been largely overlooked in previous studies. In Gammarus pulex , an amphipod crustacean, PCMG lasts several weeks, yet females are described as bearing only cost from such male mating strategy. We investigated potential female benefits by assessing the effect of mate guarding on her intermoult duration. Unpaired females had longer i

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Mayouré Edith, Marcellin YAMKOULGA, Elsa ZONGO, et al. "Influence of Senegalia macrostachya seed availability on Caryedon furcatus (Anton & Delobel) oviposition behaviour and its larvae survival." South Asian Journal of Experimental Biology 12, no. 6 (2023): 920–27. http://dx.doi.org/10.38150/sajeb.12(6).p920-927.

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Senegalia macrostachya is a wild legume whose seeds are highly prized by the Burkinabe population. Unfortunately, they are severely depreciated during storage by the main pest Caryedon furcatus. However, very few studies have looked at the impact of the amount of S. macrostachya seeds on major biological parameters such as egg laying and development of C. furcatus. These data could contribute to better control of this pest. The aim of the study was to evaluate the impact of the quantity of S. macrostachya seeds on the egg laying behaviour of C. furcatus and on the ability of the larvae to weav

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Messing, Russell, and Daniel Papaj. "Asymmetries in Physiological State as a Possible Cause of Resident Advantage in Contests." Behaviour 135, no. 8 (1998): 1013–30. http://dx.doi.org/10.1163/156853998792913546.

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AbstractAs is common in defense of resources in many animals, contests on host fruit between female Mediterranean fruit flies (Ceratitis capitata) are generally resolved in favour of the resident individual. Here we offer an interpretation of resident advantage in this species which is derived from a dynamical state-variable perspective on behaviour. We first demonstrated the occurrence of residence advantage. In field-cage assays of freely-foraging and freely-interacting females within a tree bearing host coffee berries, the occurrence of two females on a berry almost always resulted in conte

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Setyanto, Arief, Muhammad Arif Rahman, Yulianita Fatmasari, et al. "Species Composition and Length-Weight Frequency Distribution of Lobsters (Panulirus spp.) Landed on The Puger Coast, Jember Regency, East Java." BERKALA SAINSTEK 13, no. 2 (2025): 96–108. https://doi.org/10.19184/bst.v13i2.53709.

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Lobsters are one of the most economically valuable fishery resources, with the majority of catches obtained from marine environments. This study aims to identify and determine the species composition of lobsters based on the fishing gear used by local fishers in Puger Beach, as well as to analyze key biological parameters of lobsters, including the distribution of carapace length and body weight, the length-weight relationship, and sex ratio. Sampling was conducted on lobsters landed at Puger Beach from January to March 2020, resulting in a total of 2,485 individual records containing carapace

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Botter-Carvalho, M. L., L. B. Costa, L. L. Gomes, C. C. C. Clemente, and P. V. V. Da C. Carvalho. "Reproductive biology and population structure ofAxianassa australis(Crustacea, Axianassidae) on a sand-mud flat in north-eastern Brazil." Journal of the Marine Biological Association of the United Kingdom 95, no. 4 (2015): 735–45. http://dx.doi.org/10.1017/s002531541400174x.

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The life history of the mud shrimpAxianassa australis, a common and widespread burrower inhabiting coastal mangroves and mud flats, is poorly known. This contribution presents the first information about the population structure, reproductive biology and fecundity ofA. australis, based on individuals collected from September 2011 to December 2012 on Casa Caiada Beach, located in a densely urbanized area in north-eastern Brazil, using a yabby pump. The sex ratio did not depart significantly from the expected 1:1 proportion. A significant trend of left-handedness of the major cheliped was observ

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PIRANI, GABRIELA, and DAVID A. GRIMALDI. "Rediscovery, redescription, and reclassification of the rare and unusual fly Pyrgometopa penicillata Kertész (Diptera: Drosophilidae)." Zootaxa 4661, no. 3 (2019): 445–56. http://dx.doi.org/10.11646/zootaxa.4661.3.2.

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For slightly more than a century only the type specimen has been known for Pyrgometopa penicillata, a monotypic genus of Drosophilidae whose sole species has an ocellar triangle distended into a bizarre tubercle bearing a tuft of large, spine-like bristles in both sexes. Here we report additional specimens of both sexes of the species, recently rediscovered from Brazil, Peru and French Guyana, allowing us to state that Pyrgometopa is a junior synonym for Stegana, a large cosmopolitan genus. A detailed redescription of Stegana penicillata (Kertész) new combination is provided, including new mor

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Withers, T. M., and M. O. Harris. "Influence of grass species on the foraging behaviour of Platygaster hiemalis a parasitoid of the Hessian fly Mayetiola destructor." New Zealand Plant Protection 58 (August 1, 2005): 197–201. http://dx.doi.org/10.30843/nzpp.2005.58.4272.

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Platygaster hiemalis is an egg parasitoid of the Hessian fly Mayetiola destructor a pest of both New Zealand wheat Triticum aestivum (Tribe Triticeae) and prairie grass Bromus willdenowii (Tribe Bromeae) The searching and ovipostion behaviour of P hiemalis females in relation to Hessian fly eggs oviposited on these two grass hosts was investigated Individual females (n15) were observed foraging for 60 min in an array of six wheat seedlings and six prairie grass seedlings with all plants bearing Hessian fly eggs (mean of 56 eggs) and plant type alternated within the array Before being released

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Taylor, H. H., and N. Leelapiyanart. "Oxygen uptake by embryos and ovigerous females of two intertidal crabs, Heterozius rotundifrons (Belliidae) and Cyclograpsus lavauxi (Grapsidae): scaling and the metabolic costs of reproduction." Journal of Experimental Biology 204, no. 6 (2001): 1083–97. http://dx.doi.org/10.1242/jeb.204.6.1083.

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Heterozius rotundifrons and Cyclograpsus lavauxi are crabs of similar size, whose intertidal habitats overlap. They differ in the number and size of their eggs. A 2 g ovigerous H. rotundifrons incubates 675 large yolky eggs (mean single-egg mass 269 microg; egg clutch 9.15 % of mass of female crab; increasing to 435 microg and 13.4 % at hatching). The egg clutch of a 2 g C. lavauxi is larger (15.4 % of crab mass increasing to 18.9 % at hatching) and contains more numerous (28 000), smaller (10.9 microg increasing to 20.3 microg) eggs. The longer development time of the larger eggs (194 days ve

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Meyers, M. A., G. Burns, D. Arn, and J. L. Schenk. "266 BIRTH OF CANINE OFFSPRING FOLLOWING INSEMINATION OF A BITCH WITH FLOW-SORTED SPERMATOZOA." Reproduction, Fertility and Development 20, no. 1 (2008): 213. http://dx.doi.org/10.1071/rdv20n1ab266.

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Different traits and temperaments that are sex-related often underlie the selection of guide dogs used for auditory and/or visually impaired humans. The objective of this project was to select X-chromosome-bearing canine sperm by means of flow cytometry/cell sorting based on DNA content (X chromosome- bearing canine sperm contain 3.7% more DNA than Y-chromosome-bearing sperm) and use the sorted sperm for artificial insemination (AI) to produce live offspring. This technology has proven reliable for sex selecting offspring using AI in a number of species and is of great commercial value to food

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Skourti, Anna, Nickolas G. Kavallieratos, and Nikos E. Papanikolaou. "How Is Fitness of Tribolium castaneum (Herbst) (Coleoptera: Tenebrionidae) Affected When Different Developmental Stages Are Exposed to Chlorfenapyr?" Insects 11, no. 8 (2020): 542. http://dx.doi.org/10.3390/insects11080542.

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Tribolium castaneum (Herbst) (Coleoptera: Tenebrionidae) is an important pest of stored products. Insecticidal treatment is a common practice for the control of this notorious insect pest. Most studies are focused on the immediate and/or delayed mortality effects, while there are no data on the effects of insecticides on the population fitness. This study deals with the effect of chlorfenapyr on T. castaneum, investigating the cost of exposure of different developmental stages on population performance, by using life table statistics and a survival analysis method. For this purpose, eggs, larv

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Müller Baigorria, Micaela, Maite Narvarte, and Leandro A. Hünicken. "Moving Northwards: Life-History Traits of the Invasive Green Crab (Carcinus maenas) Expanding into the Southwestern Atlantic." Biology 14, no. 5 (2025): 480. https://doi.org/10.3390/biology14050480.

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The invasive European green crab (Carcinus maenas) poses a significant ecological threat due to its rapid global spread and disruptive impact on coastal ecosystems. In the southwestern Atlantic, the northernmost population was recently recorded in the San Matías Gulf, offering a unique opportunity to study its demographic and life-history traits at the leading edge of its range. We assessed the sex ratio, population density, size distribution, and size at which 50% of females were ovigerous (SM50) in the intertidal zone. Our findings revealed a male-biased sex ratio (1.50 males per female) and

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Kamiya, Junki, Woojin Kang, Keiichi Yoshida, et al. "Suppression of Non-Random Fertilization by MHC Class I Antigens." International Journal of Molecular Sciences 21, no. 22 (2020): 8731. http://dx.doi.org/10.3390/ijms21228731.

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Hermaphroditic invertebrates and plants have a self-recognition system on the cell surface of sperm and eggs, which prevents their self-fusion and enhances non-self-fusion, thereby contributing to genetic variation. However, the system of sperm–egg recognition in mammals is under debate. To address this issue, we explored the role of major histocompatibility complex class I (MHC class I, also known as histocompatibility 2-Kb or H2-Kb and H2-Db in mice) antigens by analyzing H2-Kb-/-H2-Db-/-β2-microglobulin (β2M)-/- triple-knockout (T-KO) male mice with full fertility. T-KO sperm exhibited an i

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Zhang, Zhi-Ying, Wei Li, Qi-Chao Huang, et al. "Cut to Disarm Plant Defence: A Unique Oviposition Behaviour in Rhynchites foveipennis (Coleoptera: Attelabidae)." Insects 14, no. 2 (2023): 200. http://dx.doi.org/10.3390/insects14020200.

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Female weevils of the family Attelabidae (Coleoptera: Curculionoidea) possess a unique behaviour of partially cutting the branches connecting egg-bearing organs of their host plants during oviposition. However, the consequence of such behaviour remains unclear. Using Rhynchites foveipennis and its host pear (Pyrus pyrifolia), the present study tested the hypothesis that the oviposition behaviour could disarm the host plants’ defence. We compared the survival rates, growth rates, and performance of eggs and larvae under two conditions: (1) the fruit stems were naturally damaged by the females b

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Cooke, Barry J. "Forest Landscape Effects on Dispersal of Spruce Budworm Choristoneura fumiferana (Clemens, 1865) (Lepidoptera, Tortricidae) and Forest Tent Caterpillar Malacosoma disstria Hübner, 1820 (Lepidoptera, Lasiocampidae) Female Moths in Alberta, Canada." Insects 13, no. 11 (2022): 1013. http://dx.doi.org/10.3390/insects13111013.

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Leaf-rollers and tent caterpillars, the families Torticidae and Lasiocampidae, represent a significant component of the Lepidoptera, and are well-represented in the forest insect pest literature of North America. Two species in particular—spruce budworm (Choristoneura fumiferana (Clem.)) and forest tent caterpillar (Malacosoma disstria Hbn.)—are the most significant pests of the Pinaceae and Salicacae, respectively, in the boreal forest of Canada, each exhibiting periodic outbreaks of tremendous extent. Dispersal is thought to play a critical role in the triggering of population eruptions and

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ReijoPiera, R. A. "006. HUMAN GERM CELL FORMATION AND DIFFERENTIATION FROM PLURIPOTENT STEM CELLS." Reproduction, Fertility and Development 22, no. 9 (2010): 5. http://dx.doi.org/10.1071/srb10abs006.

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Human embryo development begins with the fusion of egg and sperm, followed by reprogramming of the DNA, a series of cell divisions and activation of the embryo’s genome. As development continues, the germ cells (egg and sperm) must be set aside from other cell types. A major cause of infertility in men and women is quantitative and qualitative defects in human germ cell (oocyte and sperm) development. Yet, it has been difficult to study human germ cell development, especially features that are unique relative to model organisms. We have developed a system to differentiate human embryonic stem

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Bernarde, Paulo Sérgio, and Marcelo N. de C. Kokubum. "Seasonality, age structure and reproduction of Leptodactylus (Lithodytes) lineatus (Anura, Leptodactylidae) in Rondônia state, southwestern Amazon, Brazil." Iheringia. Série Zoologia 99, no. 4 (2009): 368–72. http://dx.doi.org/10.1590/s0073-47212009000400005.

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Leptodactylus(Lithodytes) lineatus (Schneider, 1799) is an Amazonian leaf litter frog considered rare or uncommon in several studies on anuran communities. Despite being a widely distributed frog in Amazonian forests, knowledge of the biology and ecology of this species is relatively scarce. This species has been reported to live in association with leaf-cutter ant nests (Atta spp.) during the breeding period. In this paper we present data on the seasonality of this species and some reproductive information gathered at a locality of Rondônia state, northwestern Brazil. Field work was carried o

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Gao, Wei, Yan-Bo Sun, Wei-Wei Zhou, et al. "Genomic and transcriptomic investigations of the evolutionary transition from oviparity to viviparity." Proceedings of the National Academy of Sciences 116, no. 9 (2019): 3646–55. http://dx.doi.org/10.1073/pnas.1816086116.

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Viviparous (live-bearing) vertebrates have evolved repeatedly within otherwise oviparous (egg-laying) clades. Over two-thirds of these changes in vertebrate reproductive parity mode happened in squamate reptiles, where the transition has happened between 98 and 129 times. The transition from oviparity to viviparity requires numerous physiological, morphological, and immunological changes to the female reproductive tract, including eggshell reduction, delayed oviposition, placental development for supply of water and nutrition to the embryo by the mother, enhanced gas exchange, and suppression

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Ridley, Emma V., Adam C. N. Wong, and Angela E. Douglas. "Microbe-Dependent and Nonspecific Effects of Procedures To Eliminate the Resident Microbiota from Drosophila melanogaster." Applied and Environmental Microbiology 79, no. 10 (2013): 3209–14. http://dx.doi.org/10.1128/aem.00206-13.

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ABSTRACTComparisons of animals bearing and lacking microorganisms can offer valuable insight into the interactions between animal hosts and their resident microbiota. Most hosts are naturally infected, and therefore, these comparisons require specific procedures (e.g., antibiotic treatment or physical exclusion of microorganisms) to disrupt the microbiota, but the potential for confounding nonspecific effects of the procedure on the traits of the host exists. Microbe-dependent and nonspecific effects can be discriminated by using multiple procedures: microbe-dependent effects are evident in ho

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Souissi, Sami, and Anissa Souissi. "Promotion of the Development of Sentinel Species in the Water Column: Example Using Body Size and Fecundity of the Egg-Bearing Calanoid Copepod Eurytemora affinis." Water 13, no. 11 (2021): 1442. http://dx.doi.org/10.3390/w13111442.

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The development of sentinel species in aquatic ecosystems is mostly based on benthic organisms; however, organisms living in water column such as zooplankton have received less attention, except for some cladocerans. In this paper, a new ecological indicator based on simple measurements of the size and fecundity of egg-bearing calanoid copepods is developed. The well-studied estuarine copepod Eurytemora affinis is used to illustrate this new framework. A large database obtained from laboratory experiments developed under different conditions is used to define a reference regression line betwee

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Pope, C. E., E. B. Crichton, M. C. Gmez, C. Dumas, and B. Dresser. "267 BIRTH OF DOMESTIC CAT KITTENS OF PREDETERMINED SEX AFTER TRANSFER OF EMBRYOS PRODUCED BY IN VITRO FERTILIZATION OF OOCYTES WITH FLOW-SORTED SPERMATOZOA." Reproduction, Fertility and Development 20, no. 1 (2008): 213. http://dx.doi.org/10.1071/rdv20n1ab267.

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In cats, sex selection by fertilization of oocytes with sperm sorted into X- andY-chromosome-bearing populations has credible biomedical, commercial, and conservation connotations. Our objectives were (1) to evaluate the efficiency with which embryos could be produced by IVF of in vivo- and in vitro-matured oocytes with cooled sex-sorted sperm after overnight shipment to the sorting facility and overnight return delivery to an IVF laboratory, and (2) to determine if live kittens of predetermined sex (female) could be produced after transfer of embryos derived by IVF of in vivo-matured oocytes

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Mala, M., M. Jahan, and KS Islam. "Comparative Prey Consumption of a Predatory Spider, Pardosa pseudoannulata (Bosenberg and Strand) on Three Different Diets." Progressive Agriculture 20, no. 1-2 (2013): 57–62. http://dx.doi.org/10.3329/pa.v20i1-2.16850.

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Prey consumption efficiency of the wolf spider, Pardosa pseudoannulata (Boesenberg and Strand) preying on brown planthopper (BPH), Nilaparvata lugens (Stål), green leafhopper (GLH), Nephotettix virescens (Distant) and drosophila, Drosophila melanogaster was investigated in the laboratory of the Department of Entomology, Bangladesh Agricultural University, Mymensingh during the period from June 2008 to April 2009. Depending on the instars and maturity, the spiders were grouped into four different age classes, namely Class I (3rd and 4th instars), Class II (5th and 6th instars), Class III (7th a

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Kontodimas, D. C., and N. G. Kavallieratos. "First phenological data of the rose pest Homalorhynchites hungaricus (Herbst) (Coleoptera: Rhynchitidae) in Greece." ENTOMOLOGIA HELLENICA 15 (June 7, 2017): 62. http://dx.doi.org/10.12681/eh.14048.

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The rose curculio Homalorhynchites hungaricus (Herbst, 1783) (=Rhynchites hungaricus, =Mechoris ungaricus, =Mecorhis ungaricus) (Coleoptera: Rhynchitidae) has been recorded in Greece (Attica, May 2004) infesting blooms of ornamental roses [Rosa sp. (Rosaceae)]. This pest has also been recorded in Bulgaria and in Turkey causing serious damages on oil-bearing roses (Rosa damascena Mil1. var. kazanlika and Rosa damascena Mill. var. tringipetala respectively). In Turkey the subspecies Η. hungaricus (Herbst) subsp. marginicollis Schilskly seems to be more important. Homalorhynchites hungaricus comp

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Chow-Fraser, Patricia, and Edward J. Maly. "Factors Governing Clutch Size in Two Species of Diaptomus (Copepoda: Calanoida)." Canadian Journal of Fisheries and Aquatic Sciences 48, no. 3 (1991): 364–70. http://dx.doi.org/10.1139/f91-048.

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We conducted a synoptic survey of 11 nonstratifying takes in eastern Quebec to investigate the relative importance of water temperature, food concentration ([Chl a]), female prosome length, copepod density (population and community densities), and mate availability (sex ratio and density of males) in determining the clutch size of two freshwater copepods, Diaptomus minutus and D. oregonensis. Multiple regression analyses indicated that 60% of the variation in clutch size of D. minutus could be accounted for by temperature and [Chl a] (n = 33; P = 0.0001), while 80% of the variation in the D. o

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Bayramov, A., and M. Maharramov. "On the Hydrofauna of the First Batabat Water Reservoir." Bulletin of Science and Practice 10, no. 4 (2024): 95–100. http://dx.doi.org/10.33619/2414-2948/101/14.

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For the first time generalized data on hydrofauna of the First Batabat reservoir are given. In the fauna 6 species of zooplanktonic organisms are revealed, with absolute predominance of large predatory copepod Hemidiaptomus rylovi Charin, 1928. The mean body length of fertilized egg-bearing female crustaceans was 3.6 mm to the furca and 5.1 mm to the tip of the telson. In the ecosystem, Daphnia pulex Leydig, 1860 typically produces its last parthenogenetic generation in September. In the macrozoobenthos of the reservoir, 40 species of macrobenthic organisms were found, with the Heteroptera (9

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Charchar, João, Maria Jose Charchar, Jonathan Eisenback, and Maria Esther Boiteux. "Meloidogyne pisi n. sp. (Nematoda: Meloidogynidae), a root-knot nematode parasitising pea in Brazil." Nematology 10, no. 4 (2008): 479–93. http://dx.doi.org/10.1163/156854108784513905.

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AbstractMeloidogyne pisi n. sp. is described and illustrated from specimens obtained from roots of pea cv. Mikado in Brasilia, Brazil. The female perineal pattern is variable in shape, most are rounded to ovoid, whereas others have a moderately high, squarish dorsal arch, and can be marked with several striae parallel to the vulva or may be nearly free of striae. Lateral fields may contain a few irregular, wavy, transverse striae or be difficult to discern. Female medial lips are wide and long, sometimes with distinctly indented outer margins; the lateral lips are large and triangular, head an

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Somers, Keith M., and Roger H. Green. "Seasonal patterns in trap catches of the crayfish Cambarus bartoni and Orconectes virilis in six south-central Ontario lakes." Canadian Journal of Zoology 71, no. 6 (1993): 1136–45. http://dx.doi.org/10.1139/z93-155.

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Crayfish were trapped in six south-central Ontario lakes to examine seasonal changes in estimates of relative abundance. Baited-trap catches of Cambarus bartoni and Orconectes virilis correlated with changes in water temperature. Cambarid catches increased in the spring until a midsummer maximum, but dropped suddenly as the water temperature began to fall in August. Ovigerous (i.e., egg-bearing) females and recently moulted males were captured by SCUBA divers in August. Trap catches increased, once breeding and moulting periods concluded, and subsequently decreased as water temperatures contin

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Kvach, Yuriy, Halyna Gabrielczak, Anastasiia Lepekha, Mikhail O. Son, and Sergii Khutornoi. "The Chesapeake blue crab, Callinectes sapidus Rathbun, 1896: new finding, origin, and further spread in the Ukrainian part of the Black Sea." Aquatic Invasions 20, no. (2) (2025): 199–214. https://doi.org/10.3391/ai.2025.20.2.154614.

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Biological invasions pose a significant threat to aquatic ecosystems, and the spread of uncontrolled non-indigenous species can have detrimental effects on biodiversity, ecosystem processes, and economic activities. The Chesapeake blue crab, <i>Callinectes sapidus</i>, native to the western Atlantic Ocean, is non-indigenous in the Black Sea region. This study presents novel findings on its presence and breeding in the Black Sea, particularly in North-Western part within the territorial confines of Ukraine. The study provides evidence of successful reproduction by a female blue crab with eggs i

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Pustova, N. V. "GROWING OF ECOLOGICAL PRODUCTS OF GUINEA-FOWLS IN PRIVATE ECONOMY." Scientific and Technical Bulletin оf State Scientific Research Control Institute of Veterinary Medical Products and Fodder Additives аnd Institute of Animal Biology 22, no. 2 (2021): 290–99. http://dx.doi.org/10.36359/scivp.2021-22-2.34.

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The growing of guinea-fowls to increase the variety of products of the poultry farming to due to dietary products – eggs and meat of guinea-fowls. The method of researches foresaw the study of features of guinea-fowls as to the kind and productive qualities of breeds, populaces and crosses. Bases of maintenance and care are of guinea-fowls in a private economy, at enclosure and pasture maintenance of bird. The breeds of guinea-fowls are most widespread – grey, blue, colorful (white-brisket) and whites of breed. Populaces of guinea-fowls: blue, cream, black (violet, dark), light violet (l

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