Letteratura scientifica selezionata sul tema "Jackals – Food"
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Articoli di riviste sul tema "Jackals – Food"
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Temu, S. E., C. L. Nahonyo e P. D. Moehlman. "Comparative Foraging Efficiency of Two Sympatric Jackals, Silver-Backed Jackals (Canis mesomelas) and Golden Jackals (Canis aureus), in the Ngorongoro Crater, Tanzania". International Journal of Ecology 2016 (2016): 1–5. http://dx.doi.org/10.1155/2016/6178940.
Testo completoAbstract (sommario):
The foraging efficiency of two sympatric species of jackals, silver-backed jackals (Canis mesomelas) and golden jackals (Canis aureus), was studied in the Ngorongoro crater from July 2014 through May 2015. The focal animal observation method was used and individuals of both species were followed as they foraged from morning to evening. Observations of individuals of both jackal species were made from a vehicle using binoculars and a spotting scope. Three major parameters were used for determination of foraging efficiency: distance travelled while foraging, time spent foraging, and amount of food secured in foraging period. The Mann–Whitney U test showed no significant difference (P>0.05) in distance travelled per unit time of foraging between the two species in the dry and wet seasons, respectively. Golden jackals secured a significantly higher amount of food than the silver-backed jackals in the wet season (Mann–Whitney U test, P<0.05, U=1035.4). Hunting of prey larger than Thomson’s gazelle (Eudorcas thomsonii) fawns was not common. Both species mainly fed on smaller prey such as invertebrates and rodents and scavenged opportunistically. Efficient foraging is crucial for both jackal species especially during their breeding season when they are provisioning dependent pups.
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Kamler, Jan F., Christin Minge, Susana Rostro-García, Tazarve Gharajehdaghipour, Rachel Crouthers, Visattha In, Chen Pay, Chanratana Pin, Prum Sovanna e David W. Macdonald. "Home range, habitat selection, density, and diet of golden jackals in the Eastern Plains Landscape, Cambodia". Journal of Mammalogy 102, n. 2 (20 marzo 2021): 636–50. http://dx.doi.org/10.1093/jmammal/gyab014.
Testo completoAbstract (sommario):
Abstract We used radiocollars and GPS collars to determine the movements and habitat selection of golden jackals (Canis aureus) in a seasonally dry deciduous forest with no human settlements in eastern Cambodia. We also collected and analyzed 147 scats from jackals to determine their seasonal diet and prey selection. The mean (± SE) annual size of home-range ranges (47.1 ± 2.5 km2; n = 4), which were mutually exclusive between mated pairs, was considerably larger than that previously reported for this species, resulting in an extremely low density (0.01 jackal/km2). The unusually large home ranges and low density probably were due to the harsh dry season when most understory vegetation is burned and nearly all waterholes dry up, thereby causing a large seasonal decline in the availability of small vertebrate prey. Resident groups consisted of an alpha pair, but no betas, and were situated only in areas not occupied by leopards (Panthera pardus) and dholes (Cuon alpinus). Jackals avoided dense forests and streams, and had a strong selection for dirt roads, possibly to avoid larger predators. Overall the jackal diet was diverse, with at least 16 prey items identified, and there was no significant difference in diet composition between the cool-dry and hot-dry seasons. Scat analysis showed that the main food items consumed by jackals were processional termites (Hospitalitermes spp.; 26% biomass consumed), followed by wild pig (Sus scrofa; 20%), muntjac (Muntiacus vaginalis; 20%), and civets (17%). Compared to available biomass, jackals were not random in their consumption of ungulates because muntjac were selectively consumed over larger ungulate species. Dietary overlap with dholes and leopards was relatively low, and consumption patterns indicated jackals were preying on ungulates rather than scavenging from kills of larger carnivores. Our results showed that the jackal is an extremely adaptable and opportunistic species that exhibits unique behaviors to survive in an extreme environment near the edge of its distribution.
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Yousuf, MA, J. Bashu, M. Pervin, MT Islam, PM Das e MAHNA Khan. "Identifying Diseases of Golden Jackals of Bangladesh Agricultural University Campus, Mymensingh, Bangladesh". Bangladesh Journal of Veterinary Medicine 12, n. 2 (24 dicembre 2014): 217–24. http://dx.doi.org/10.3329/bjvm.v12i2.21295.
Testo completoAbstract (sommario):
Golden jackals is one of the semidomestic wild carnivors of the environment of Bangladesh Agricultural University (BAU) campus and now a days very often share spend their time with native dogs and cats in the gouse food wastes. This is not unusual for jackals to share diseases of dogs and cats. This study was aimed to identify important diseases of golden jackals and categorized to their zoonotic importance. A total of five apparently healthy golden jackals were collected from BAU campus and thorough postmortem examination was carried out during the period from July to December, 2010. Histopathological studies were conducted using routine Hematoxylin & Eosin procedure. The existence of blood parasites were studied by Giemsas staining. Polymerase Chain Reaction (PCR) & Reverse Transcription-Polymerase Chain Reaction (RT-PCR) were adopted for the detection of tuberculosis (TB), canine distemper (CD) and avain influenza virus (AI). Other diseases investigated were liverfluke, whipworm, lungworm, mites and ascariasis. Out of five jackals examined, four were infected with heartworm Dirofilaria immitis. Gross examination of a Jackal at necropsy revealed nodular lesions in lungs and suspected as a case of TB. Acid fast staining and PCR protocol specific for TB could not detect mycobacterium in the nodular lungs lesions. Results of RT- PCR with the extracted RNA from liver showed amplification of 287bp fragment specific for CD viral infection in two cases. This is the first study in Bangladesh describing infection of CD in jackals. Jackals are scavanging in nature and reasonably AI could have present in jackals. RT-PCR protocol specific for matrix protein gene of AI viruses did not amplify any nucleic acid fragment. Results of this study showed that the golden jackals of BAU campus were infected with heartworm, lungworm, liverfluke, whipeworm, ascarids, mites and CD viruses. Extensive investigation is needed to explore the existance of few other important diseases of jackals including bovine and human TB, AI, leishmaniasis, rabies, Toxoplasmosis, Infectious canine hepatitis, Taeniasis and Canine hookworm infestation. heartworm, whipworm and mites have zoonotic importance, therefore, it needs to develop stretagy to prevent their future dessimination in human and other animals.DOI: http://dx.doi.org/10.3329/bjvm.v12i2.21295 Bangl. J. Vet. Med. (2014). 12 (2): 217-224
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Lanszki, J., M. Heltai e L. Szabó. "Feeding habits and trophic niche overlap between sympatric golden jackal (Canis aureus) and red fox (Vulpes vulpes) in the Pannonian ecoregion (Hungary)". Canadian Journal of Zoology 84, n. 11 (novembre 2006): 1647–56. http://dx.doi.org/10.1139/z06-147.
Testo completoAbstract (sommario):
The feeding ecology of the golden jackal ( Canis aureus L., 1758) and its interspecific trophic relationship with the sympatric red fox (Vulpes vulpes (L., 1758)) was investigated in an area of recent range expansion of the golden jackal in Hungary, central Europe. Diet composition was determined by scat analysis (over 4 years: jackal 814 scats; fox 894 scats). Compared with jackals, foxes consumed more small mammals (mean biomass consumed: jackal 77%; fox 68%) and to a lesser extent plant matter (6% and 18%, respectively). The importance of other prey, such as wild boar ( Sus scrofa L., 1758), cervids, brown hare ( Lepus europaeus Pallas, 1778), birds, reptiles, fish, invertebrates, and domestic animals, was minimal. Both mesocarnivores consumed primarily small animals (<50 g: 92% and 87%, respectively); this implies a typical searching and solitary hunting strategy. The trophic niche breadth of both species was very narrow and the fox proved to be more of a generalist. The food overlap index between the two canids was high (mean, 73%) and varied with the decreasing availability and consumption of small mammals. Based on prey remains found in scats, small-mammal specialization over a 2-year period and seasonal predation upon wild boar piglets (mainly by the jackal), seasonal fruit eating (mainly by the fox), and scavenging on wild or domestic ungulates (both predators) were found.
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Borchering, Rebecca K., Steve E. Bellan, Jason M. Flynn, Juliet R. C. Pulliam e Scott A. McKinley. "Resource-driven encounters among consumers and implications for the spread of infectious disease". Journal of The Royal Society Interface 14, n. 135 (ottobre 2017): 20170555. http://dx.doi.org/10.1098/rsif.2017.0555.
Testo completoAbstract (sommario):
Animals share a variety of common resources, which can be a major driver of conspecific encounter rates. In this work, we implement a spatially explicit mathematical model for resource visitation behaviour in order to examine how changes in resource availability can influence the rate of encounters among consumers. Using simulations and asymptotic analysis, we demonstrate that, under a reasonable set of assumptions, the relationship between resource availability and consumer conspecific encounters is not monotonic. We characterize how the maximum encounter rate and associated critical resource density depend on system parameters like consumer density and the maximum distance from which consumers can detect and respond to resources. The assumptions underlying our theoretical model and analysis are motivated by observations of large aggregations of black-backed jackals at carcasses generated by seasonal outbreaks of anthrax among herbivores in Etosha National Park, Namibia. As non-obligate scavengers, black-backed jackals use carcasses as a supplemental food resource when they are available. While jackals do not appear to acquire disease from ingesting anthrax carcasses, changes in their movement patterns in response to changes in carcass abundance do alter jackals' conspecific encounter rate in ways that may affect the transmission dynamics of other diseases, such as rabies. Our theoretical results provide a method to quantify and analyse the hypothesis that the outbreak of a fatal disease among herbivores can potentially facilitate outbreaks of an entirely different disease among jackals. By analysing carcass visitation data, we find support for our model's prediction that the number of conspecific encounters at resource sites decreases with additional increases in resource availability. Whether or not this site-dependent effect translates to an overall decrease in encounters depends, unexpectedly, on the relationship between the maximum distance of detection and the resource density.
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Tsunoda, H., E. G. Raichev, C. Newman, R. Masuda, D. M. Georgiev e Y. Kaneko. "Food niche segregation between sympatric golden jackals and red foxes in central Bulgaria". Journal of Zoology 303, n. 1 (18 aprile 2017): 64–71. http://dx.doi.org/10.1111/jzo.12464.
Testo completo
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Baskaran, Nagarajan, Ganesan Karthikeyan e Kamaraj Ramkumaran. "Golden Jackal Canis aureus Linnaeus, 1758 (Mammalia: Carnivora: Canidae) distribution pattern and feeding at Point Calimere Wildlife Sanctuary, India". Journal of Threatened Taxa 12, n. 11 (26 agosto 2020): 16460–68. http://dx.doi.org/10.11609/jott.4489.12.11.16460-16468.
Testo completoAbstract (sommario):
Golden Jackal Canis aureus, a medium-sized omnivore belonging to the family Canidae, ranges widely from Europe and extends across the middle-east to India. It’s adaptable social system according to the distribution of food resources enabling it to range widely from desert to evergreen forests, mangroves, rural, and semi-urban human-agro-ecosystems. Despite its wide distribution, the species has not received adequate scientific attention in much of its southern India range. This study was carried out to assess its distribution pattern, diet composition, and prey preference at Point Calimere Wildlife Sanctuary, a well-known habitat for the jackal and the only predator of the sanctuary. Data on distribution collected through extensive field surveys revealed that the species distribution is uniform in southern and southeastern parts of the sanctuary, in areas where the habitat is more open with grasslands and mudflats and is patch in the tropical dry-evergreen habitat. Analysis of 155 scat samples revealed that the diet comprised 19 species of food items, including mammals, birds, insects, other invertebrates, and plant matter characterizing omnivorous nature. Temporal variation in diet composition—with significantly higher proportion of birds during winter than in summer—coincides with abundance of prey species in relation to season, which indicate the opportunistic foraging and hunting nature of the species. Data on diet preference showed that jackals in the area preferred Black-naped Hare, Spotted Dove and Lapwing followed by Chital, Grey Francolin, Cattle Egret, and Large Egret, while Blackbuck, Bonnet Macaque, and cattle were not preferred, which is discussed under optimal foraging. The jackal being the only large-sized predator of this natural system, more detailed studies and effective measures to conserve the species are vital not only to understand the prey-predator mechanism, but also to conserve the biodiversity of this unique ecosystem.
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Mirjalali, H., S. Rezaei, E. Pozio, S. R. Naddaf, A. Salahi-Moghaddam, E. B. Kia, F. Shahbazi e Gh Mowlavi. "Trichinella britovi in the jackal Canis aureus from south-west Iran". Journal of Helminthology 88, n. 4 (9 maggio 2013): 385–88. http://dx.doi.org/10.1017/s0022149x1300028x.
Testo completoAbstract (sommario):
AbstractTrichinellosis is an important helminthic food-borne zoonosis, which is caused by nematodes of the genus Trichinella. Although, Trichinella spp. has been detected frequently in Iranian wildlife, this parasitic infection is not considered a major public health problem. This is largely because Islamic codes forbid consumption of pork meat in this country. However, knowledge about this zoonotic pathogen is important because human trichinellosis has been documented in countries where most of the population is Muslim. The aims of the present work were to investigate whether Trichinella spp. was still circulating in wildlife of the Khuzestan Province (south-west Iran) about 30 years after the first investigation, to identify the aetiological agent at the species level by molecular analyses, and to review the literature on Trichinella spp. in animals of Iran. During the winter 2009–2010, muscle samples from 32 road-killed animals (14 dogs and 18 jackals, Canis aureus) were collected. Muscle samples were digested and Trichinella sp. larvae were isolated from two jackals. The Trichinella sp. larvae have been identified as Trichinellabritovi by molecular analyses. These results confirm that T. britovi is the prevalent species circulating in wild animals of Iran.
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Khan, Khursid A., Jamal A. Khan e Narendra Mohan. "Winter food habits of the Golden Jackal Canis aureus (Mammalia: Carnivora: Canidae) in Patna Bird Sanctuary, Uttar Pradesh, India". Journal of Threatened Taxa 9, n. 9 (26 settembre 2017): 10656. http://dx.doi.org/10.11609/jott.3301.9.9.10656-10661.
Testo completoAbstract (sommario):
Golden Jackal (Canis aurius indicus) survives in a wide range of environment. Its foraging adaptation varies according to quality and abundance of food sources. The food habits also fluctuate according to season and habitat. This study investigated the diet composition of Golden Jackal using scat analysis method collected between November 2012 and April 2013 from Patna Bird Sanctuary (PBS), Uttar Pradesh, India. A total of 83 scats of Golden Jackal were collected and analysed. Sixteen food items were identified in Golden Jackal scats. Birds contributed maximum (ca. 38.92%) in Golden Jackal diet followed by rodents (ca. 12.14%), insects (ca. 8.92%), reptile (ca. 8.57%), vegetative matter (ca. 13.56%), rufous-tailed hare (ca. 6.07%), cattle (ca. 2.5%), squirrel (ca.1.42%), nilgai (ca.1.07%) and common palm civet (ca. 0.71 %). However (ca. 6.07 %) of prey items could not identified in Golden Jackal scats. Out of (ca. 38.92%) in bird’s contribution egret alone contributed about (ca.20.35%) in Golden Jackal diet followed by gargeny (ca. 8.93%), greater caucal (ca. 5.71%), babbler (ca.1.07%) and (ca. 2.85%) remains of birds were could not identified as per species level. This study is conducted to find out food habits of Golden Jackal and its impact on bird community structure.
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Njenga, M. Kariuki, Naomi Kemunto, Samuel Kahariri, Lindsey Holmstrom, Harry Oyas, Keith Biggers, Austin Riddle et al. "High real-time reporting of domestic and wild animal diseases following rollout of mobile phone reporting system in Kenya". PLOS ONE 16, n. 9 (3 settembre 2021): e0244119. http://dx.doi.org/10.1371/journal.pone.0244119.
Testo completoAbstract (sommario):
Background To improve early detection of emerging infectious diseases in sub-Saharan Africa (SSA), many of them zoonotic, numerous electronic animal disease-reporting systems have been piloted but not implemented because of cost, lack of user friendliness, and data insecurity. In Kenya, we developed and rolled out an open-source mobile phone-based domestic and wild animal disease reporting system and collected data over two years to investigate its robustness and ability to track disease trends. Methods The Kenya Animal Biosurveillance System (KABS) application was built on the Java® platform, freely downloadable for android compatible mobile phones, and supported by web-based account management, form editing and data monitoring. The application was integrated into the surveillance systems of Kenya’s domestic and wild animal sectors by adopting their existing data collection tools, and targeting disease syndromes prioritized by national, regional and international animal and human health agencies. Smartphone-owning government and private domestic and wild animal health officers were recruited and trained on the application, and reports received and analyzed by Kenya Directorate of Veterinary Services. The KABS application performed automatic basic analyses (frequencies, spatial distribution), which were immediately relayed to reporting officers as feedback. Results Of 697 trained domestic animal officers, 662 (95%) downloaded the application, and >72% of them started reporting using the application within three months. Introduction of the application resulted in 2- to 14-fold increase in number of disease reports when compared to the previous year (relative risk = 14, CI 13.8–14.2, p<0.001), and reports were more widely distributed. Among domestic animals, food animals (cattle, sheep, goats, camels, and chicken) accounted for >90% of the reports, with respiratory, gastrointestinal and skin diseases constituting >85% of the reports. Herbivore wildlife (zebra, buffalo, elephant, giraffe, antelopes) accounted for >60% of the wildlife disease reports, followed by carnivores (lions, cheetah, hyenas, jackals, and wild dogs). Deaths, traumatic injuries, and skin diseases were most reported in wildlife. Conclusions This open-source system was user friendly and secure, ideal for rolling out in other countries in SSA to improve disease reporting and enhance preparedness for epidemics of zoonotic diseases.
Tesi sul tema "Jackals – Food"
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Brassine, Mathilde Chloé. "The diet and ecological role of black-backed jackals, Canis Mesomelas, in two conservation areas in the Eastern Cape Province, South Africa". Thesis, Rhodes University, 2012. http://hdl.handle.net/10962/d1005344.
Testo completoAbstract (sommario):
Mammalian predators are keystone species and can have disproportionately large impacts, relative to their abundance, on the communities and ecosystems they inhabit. In addition, predator-prey interactions (including bottom-up and top-down effects) are the fundamental linkage among species in food webs. Thus, understanding the food requirements of predators is imperative. There have been no comprehensive studies on the diet of black-backed jackals (Canis mesomelas) across a full seasonal cycle in the Albany Thicket Biome of the Eastern Cape Province. This biome is rich in plant diversity, is highly nutritious for herbivores and supports a large number of mammalian species, yet it is poorly conserved. The aim of the present study was to establish the diet of black-backed jackals on two conservation areas where thicket vegetation dominates (Great Fish River Reserve and Kwandwe Private Game Reserve). The diet was assessed using scats collected monthly from June 2009 to May 2010 and a sample of 25 stomachs over the same period. At both sites and across all seasons, mammalian hair was encountered most often (93% of all scats) and a total of 23 mammal species were consumed. Of the mammals recorded in the scats, hair from several ungulate species was encountered most frequently and these were mostly hider species (offspring hidden in tall vegetation just after birth). On a seasonal basis, the proportion of mammalian hair was lowest in autumn. However, the contribution of fruits (Carissa haematocarpa, Diospyros lycioides and Grewia robusta) to the diet was significantly higher during this season. This suggests that black-backed jackals may employ diet switching in the Eastern Cape as a mechanism to capitalise on seasonally abundant food sources. Based on the stomach content analysis, invertebrates were consumed as frequently as mammalian prey throughout the year but mammalian prey was recorded in greater quantity (i.e. volume and mass). Thus, scat analysis may have overestimated mammalian prey and fruits and underestimated the importance of invertebrates, particularly highly digestible species (e.g. termites). In spite of these differences, scat analysis demonstrated similar general and seasonal trends as the stomach content analysis. Thus, scat analysis can provide an efficient and relatively accurate source of information on the diet of blackbacked jackals in the Eastern Cape. Both stomach content and scat collection methods depicted the black-backed jackal as a generalist and opportunistic predator, mainly relying on mammals and invertebrates. Although the results of my study suggest that black-backed jackal may be important predators of certain ungulate species, further study on their prey preferences, actual biomass ingested and the effects on the population viability of prey species is required in order to develop a robust management plan for the species in the protected areas of the Eastern Cape.
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Forbes, Ross William. "The diet of black-backed jackal (Canis Mesomelas) on two contrasting land-use types in the Eastern Cape Province, South Africa and the validation of a new analytical method of mammalian hair identification". Thesis, Rhodes University, 2012. http://hdl.handle.net/10962/d1005345.
Testo completoAbstract (sommario):
Diet assessments are critical for understanding the foraging behaviour, habitat use and trophic separation of mammalian predators and are vital for gaining insight into how predators influence prey populations. The aim of this research was to qualitatively describe the diet of black-backed jackals (Canis mesomelas, Schreber 1775) using scat analysis on two contrasting land-use types in the Eastern Cape Province, South Africa. Scats were collected on a monthly basis from November 2009 to October 2010 from two game reserves (Great Fish River Reserve and Shamwari Private Game Reserve) and two neighbouring livestock farms. The relative frequency of occurrence of mammal hair (33 – 47 %) and vegetation (32 – 45%)dominated jackal diet throughout the year across the four study sites. Other important prey items included invertebrates (8 – 21 %) and fruit and seeds (3 – 11 %). Birds and reptiles constituted ≤ 2 % of the diet and were only recorded on the game reserves. Significant seasonal dietary shifts were observed on the game reserves but not on the farms. Fruit and seeds were significantly more frequent in the diet during autumn at Great Fish River Reserve and invertebrates were significantly less common in the diet during winter on both reserves. In addition, vegetation was significantly more common in the diet during winter at Shamwari Private Game Reserve. The significant temporal variation of certain prey items is testament to black-backed jackals being opportunistic generalists, foraging on those food items which are most abundant, accessible and energetically beneficial. Land-use type also influenced the diet of black-backed jackals with significantly more invertebrates and, fruit and seeds being recorded on the game reserves than on the farms. By contrast, significantly more mammal hair and vegetation were present in the diet on the farms compared with the game reserves. The mammalian component of the diet was dominated by ruminants and rodents on the game reserves and by ruminants and livestock on the farms. The presence of livestock in the diet of black-backed jackals on the farms highlights their potential impact on the livestock industry in the region and may assist farmers in determining which predators are responsible for stock loss. Previous approaches for identifying mammalian hairs from predator scats have utilised dichotomous keys and reference collections but these are often time-consuming and require a trained individual to carry out the identification. Thus, I also tested the efficacy of an automated pattern recognition programme (HairSnap) for identifying mammalian hairs from black-backed jackal scats. The overall accuracy of the programme was 38 % with black-backed jackal, Greater kudu (Tragelaphus strepsiceros) and striped polecat (Ictonyx striatus) hairs being accurately identified more often (70 – 80 %) than any other species tested. It is likely that both the size and species composition of the sample resulted in the poor accuracy of the programme. However, with the implementation of several improvement measures (e.g. adjustment of the algorithm) the programme may offer a superior, bias-free method of mammalian hair identification. The dietary information gathered here furthers our knowledge of the biology of the blackbacked jackals, especially in the locally important thicket biome. Moreover, understanding their foraging habits allows for more effective management of the species on both game reserves and farmlands. I recommend that future research should focus on quantitatively assessing the diet of black-backed jackals in the Eastern Cape Province and elsewhere. This will compliment the dietary description provided in this study and may offer a biologically more meaningful indication of the relative importance of the prey items.
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Bussiahn, Frans Ernst Carl. "The diet of the black-backed jackal (Canis mesomelas) and caracal (Felis caracal) in the Eastern Cape, South Africa". Thesis, Rhodes University, 1998. http://hdl.handle.net/10962/d1006489.
Testo completoAbstract (sommario):
The black-backed jackal (Canis mesomelas) and the caracal (Felis caracal) are considered by most farmers in the Eastern Cape to be responsible for excessive livestock losses (sheep and goats) and are, as such, hunted extensively within the Province. Stomach content analyses of individuals killed during predator control operations indicate that caracal are opportunistic hunters of small to medium-sized mammals, preying predominantly on antelope within farmland. Black-backed jackal are opportunistic omnivores, preying predominantly on livestock and antelope in farmland, while invertebrates and antelope constitute the major food items within a game reserve. The diet of caracal was found to be largely influenced by the age of individual animals with old and young animals being the predominant killers of livestock, whereas black-backed jackal diet is influenced primarily by the social structure exhibited by the species, with male animals exhibiting a marked summer peak in livestock killing, due to the increased energetic demands of parental care associated with a long term pair bond. Two caracal (a sub-adult male and adult female), were radio-tracked within farmland for a total of twelve months, yielding the smallest recorded homerange sizes for the species to date (2.1km² and 1.3km² respectively). No livestock losses were recorded within these homeranges for the duration of the study. These data suggest a relatively high abundance of caracal within Lower Albany and further illustrate that individual animals are capable of preying solely on natural prey species over an extended period, when occurring within livestock farming areas. The analysis of local hunt club records and questionnaires revealed a higher incidence of local black-backed jackal (15.2 PD/Kill), than caracal (34.7 PD/Kill), with a marked seasonal peak in kills, for both species, occurring during summer months. The use of hound packs was found to be more effective in reducing the overall abundance of caracal than black-backed jackal, as this technique was seen to eliminate more adult female caracal than black-backed jackal, during the respective breeding season of each species. Local hunt club owners and farmers were more accurate in identifying problem black-backed jackal (74%), than caracal (59%). Recommendations are presented for minimizing stock losses through the application of selective control of specific problem animals, the use of various control measures and encouraging natural prey abundance.
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Murison, Megan Kate. "The roles of black-backed jackals and caracals in issues of human-wildlife conflict in the Eastern Cape, South Africa". Thesis, Rhodes University, 2015. http://hdl.handle.net/10962/d1018667.
Testo completoAbstract (sommario):
[Partial abstract]: Human-wildlife conflict is a widely observed phenomenon and encompasses a range of negative interactions between humans and wildlife. Depredation upon livestock and game species proves to be the prevalent form of this conflict and often results in the killing of carnivores. Within the South African context, despite intense lethal control, two sympatric mesopredators, the blackbacked jackal (Canis mesomelas) and the caracal (Caracal caracal), remain common enough to be considered a major threat to human livelihoods through depredation. Wildlife ranches and livestock farms dominate the landscape in the Eastern Cape Province. Moreover, human-predator conflict within the region is extensive as both the black-backed jackal and caracal are seen to be inimical by landowners. Understanding this conflict is essential for mitigating any potential adverse environmental reactions (i.e. range collapses or extinctions) and requires knowledge of anthropogenic, ecological and environmental factors. I interviewed 73 land owners across five municipal boundaries in the Eastern Cape to quantify perceptions of predator control methods.
Libri sul tema "Jackals – Food"
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Food for jackals: Three short novels. Eugene, Oregon: Resource Publications, 2014.
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Judy, Glasman, e Margaret Harvey Gallery, a cura di. Jack's fold: An installation. St. Albans: University of Hertfordshire, 1996.
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The true story of Trapper Jack's left big toe. Brookfield, Conn: Roaring Brook Press, 2002.
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author, Jankelowitz Dean 1974, e Jaksic Julia author, a cura di. Jack's Wife Freda: Cooking from New York's West Village. 2017.
Cerca il testo completoCapitoli di libri sul tema "Jackals – Food"
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Beinart, William, e Lotte Hughes. "Hunting, Wildlife, and Imperialism in Southern Africa". In Environment and Empire. Oxford University Press, 2007. http://dx.doi.org/10.1093/oso/9780199260317.003.0009.
Testo completoAbstract (sommario):
Imperial networks in northern North America flowed initially along the waterways that gave access to the trade-associated hunting, trapping, timber extraction, and related activities. Hunting was essential to many indigenous societies, and required relatively little investment for the first wave of traders and settlers. It generated valuable resources in a number of colonized zones. But hunting frontiers in the British Empire differed. In part, the reasons were environmental. The assemblage of species in North America and Africa were possibly more similar 15,000 years ago ‘when the American West looked much as [the] Serengeti plains do today’. Large mammals including mammoths, big cats, and wild horses roamed the northern hemisphere prairies. Climate change, combined with the impact of rapid human migration through the Americas 10–12,000 years ago, resulted in many extinctions so that the wildlife of the two areas had become distinctive by the onset of European colonization. This opened up divergent opportunities for consumption and trade. Southern Africa was a frontier of heat rather than cold. There were no animals with the thick glossy fur favoured by Europeans for outer garments or for felt. Southern Africa’s most prized hunted commodity—aside from meat—was equally unpredictable. While mammoths had been exterminated in North America, an elephant species with large tusks survived into the modern era in Africa. Environmental factors also shaped the technology of hunting and carriage. Southern Africa lacked navigable rivers and lakes; Canada’s abundance of water was matched by South Africa’s dearth. Although the spread of firearms and horses was common to both regions, South Africa’s transport sinews were dusty, rutted ox-wagon tracks across the veld rather than the cool, wooded lakes and streams along which canoes could be paddled. In part, differences resulted from the chance value of particular animal products. Southern Africa was home to an extraordinary range of large mammals. The richness of wildlife can be judged by the variety of predators at the top of the food chain—lions, leopards, cheetahs, caracals, hyenas, wild dogs, jackals, as well as smaller cats. The antelope population was unparalleled in the diversity of its species. But variety did not in itself translate into value.
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Shulman, Terry Chester. "Over Her Head". In Film's First Family, 138–45. University Press of Kentucky, 2019. http://dx.doi.org/10.5810/kentucky/9780813178097.003.0017.
Testo completoAbstract (sommario):
Dolores puts her foot down and takes control of Jack’s drinking. While shooting a retake for the film Counsellor at Law, Jack goes up in his lines fifty-four times. Dolores tricks him into going to the hospital, where she has him temporarily committed for psychiatric evaluation. Jack is fired from his next picture because he can’t memorize his lines, and Dolores again takes drastic action. Before departing on a long sea voyage, she removes the alcoholic beverages from Jack’s boat. Deprived of liquor, he goes berserk, breaking his nurse’s nose and roughing up Dolores. Convinced she’s plotting again to have him committed, he absconds to the East Coast abruptly in a panicked attempt to get as far away from his wife as possible.
Atti di convegni sul tema "Jackals – Food"
1
O’Neill, Lee A., Emmanuel Fakas, Rodney Pinna e Timothy Walsh. "Floatover Deck Installation: Case Study — Structural Efficiency of Longitudinally and Transversely-Recessed Structures". In ASME 2004 23rd International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/omae2004-51100.
Testo completoAbstract (sommario):
Conventional floatover deck (FOD) installation on a jacket substructure requires the top of the structure to be recessed appropriately, either in the longitudinal or transverse direction to accommodate the vessel transporting the deck. The recess direction is very important to the design of the jacket and influences the outfitting of appurtenances, the shape of the deck and the floatover concept as a whole. This study investigates the structural integrity of typical longitudinal and transverse jackets suitable for FOD installation under both inplace and installation conditions. The study also assesses the structural efficiency of the two options under various installation conditions and benchmarks their structural performance against more conventional jackets associated with lift-installed decks.
2
Obst, Larry, Andrew Merlino, Alex Parlos e Dario Rubio. "Fault Identification in a Subsea ESP Power Distribution System Using Electrical Waveform Monitoring". In SPE Gulf Coast Section Electric Submersible Pumps Symposium. SPE, 2021. http://dx.doi.org/10.2118/204506-ms.
Testo completoAbstract (sommario):
Abstract This paper describes the technology and processes used to identify in a timely matter the source of an Instantaneous Over Current (IOC) trip during an ESP re-start at Shell Perdido SPAR. Monitoring health condition of subsea ESPs is challenging. ESPs operate in harsh and remote environments which makes it difficult to implement and maintain any in-situ monitoring system. Shell operates five subsea ESPs and implemented a topside conditioning monitoring system using electrical waveform analysis. The Perdido SPAR had a scheduled maintenance shutdown in April 2019. While ramping the facility down on April 19, 2019 the variable frequency drive (VFD) for ESP-E tripped on a cell overvoltage fault. The cell was changed, but the VFD continued to trip on instantaneous overcurrent. During ramp up beginning April 29, 2019 most equipment came back online smoothly, but the VFD of the particular ESP labeled ESP-E continued to experience the problem that was causing overcurrent trips, preventing restart. Initial investigations could not pinpoint the source of the issue. On May 1, 2019 Shell sought to investigate this issue using high-frequency electrical waveform data recorded topside as an attempt to better pinpoint the source of this trip. Analysis of electrical waveform before, during and after the IOC trip found an intermittent shorting/arcing at the VFD and ruled out any issues with the 7,000-foot-long umbilical cable or ESP motor. Upon further inspection, a VFD technician was able to visually identify the source of the problem. Relying in part on electrical waveform findings, VFD technician found failed outer jackets in the MV shielded cables at the output filter section creating a ground path from the VFD output bus via the cable shield. The cables were replaced, and the problem was alleviated allowing the system to return to normal operation. Shell credits quick and accurate analysis of electrical waveform with accelerating troubleshooting activities on the VFD, saving approximately 1-2 days of troubleshooting time and associated downtime savings, that translate to approximately 50,000 BOE deferment reduction. Analysis of high-frequency electrical waveform using physics-based and machine learning algorithms enables one to extract long-term changes in ESP health, while filtering out the shorter-term changes caused by operating condition variations. This novel approach to analysis provides operators with a reliable source of information for troubleshooting and diagnosing failure events to reduce work-over costs and limit production losses.