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Iain J. Gordon - One of the best experts on this subject based on the ideXlab platform.
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feeding success in african wild dogs does Kleptoparasitism by spotted hyenas influence hunting group size
Journal of Animal Ecology, 1997Co-Authors: Chris Carbone, J. T. Du Toit, Iain J. GordonAbstract:1. Group hunting in social carnivores is generally thought to have evolved through natural selection for improved efficiency of prey capture, increased prey size apprehended or defence of the kill against intra- and interspecific Kleptoparasitism. 2. We used a simple model to explore how variation in hunting group size or wild dogs in the Serengeti influences defence of kills against Kleptoparasitism from spotted hyenas and the trade-off effects this has on intake rate per dog for a given prey size selected. 3. The analysis presented suggests that while Kleptoparasitism substantially influences the amount of time a hunting group can access a kill, increases in access rime with increased hunting group size rarely fully compensate Cor the reduction in each dog's share of the carcass due to scramble competition among the dogs. 4. A profitability index, which includes limitations of the probability of capturing different sized prey, gut capacity, food depletion and access time, suggests that small hunting groups (1-2) would be particularly vulnerable to Kleptoparasitism because they are usable to fully satiate themselves before spotted hyenas take over their kills. Intermediate-sized hunting groups may be most effective at meeting nutritional demands over a range of prey sizes. 5. While reasons for the recent extinction of the Serengeti wild dog population remain speculative, this paper contributes lo the debate by proposing that Kleptoparasitism by spotted hyenas would have placed a major constraint on the ability of individual wild dog packs to recover from episodic disasters.
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Feeding success in African wild dogs : does Kleptoparasitism by spotted hyenas influence hunting group size ?
The Journal of Animal Ecology, 1997Co-Authors: Chris Carbone, J. T. Du Toit, Iain J. GordonAbstract:1. Group hunting in social carnivores is generally thought to have evolved through natural selection for improved efficiency of prey capture, increased prey size apprehended or defence of the kill against intra- and interspecific Kleptoparasitism. 2. We used a simple model to explore how variation in hunting group size or wild dogs in the Serengeti influences defence of kills against Kleptoparasitism from spotted hyenas and the trade-off effects this has on intake rate per dog for a given prey size selected. 3. The analysis presented suggests that while Kleptoparasitism substantially influences the amount of time a hunting group can access a kill, increases in access rime with increased hunting group size rarely fully compensate Cor the reduction in each dog's share of the carcass due to scramble competition among the dogs. 4. A profitability index, which includes limitations of the probability of capturing different sized prey, gut capacity, food depletion and access time, suggests that small hunting groups (1-2) would be particularly vulnerable to Kleptoparasitism because they are usable to fully satiate themselves before spotted hyenas take over their kills. Intermediate-sized hunting groups may be most effective at meeting nutritional demands over a range of prey sizes. 5. While reasons for the recent extinction of the Serengeti wild dog population remain speculative, this paper contributes lo the debate by proposing that Kleptoparasitism by spotted hyenas would have placed a major constraint on the ability of individual wild dog packs to recover from episodic disasters.
Chris Carbone - One of the best experts on this subject based on the ideXlab platform.
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feeding success in african wild dogs does Kleptoparasitism by spotted hyenas influence hunting group size
Journal of Animal Ecology, 1997Co-Authors: Chris Carbone, J. T. Du Toit, Iain J. GordonAbstract:1. Group hunting in social carnivores is generally thought to have evolved through natural selection for improved efficiency of prey capture, increased prey size apprehended or defence of the kill against intra- and interspecific Kleptoparasitism. 2. We used a simple model to explore how variation in hunting group size or wild dogs in the Serengeti influences defence of kills against Kleptoparasitism from spotted hyenas and the trade-off effects this has on intake rate per dog for a given prey size selected. 3. The analysis presented suggests that while Kleptoparasitism substantially influences the amount of time a hunting group can access a kill, increases in access rime with increased hunting group size rarely fully compensate Cor the reduction in each dog's share of the carcass due to scramble competition among the dogs. 4. A profitability index, which includes limitations of the probability of capturing different sized prey, gut capacity, food depletion and access time, suggests that small hunting groups (1-2) would be particularly vulnerable to Kleptoparasitism because they are usable to fully satiate themselves before spotted hyenas take over their kills. Intermediate-sized hunting groups may be most effective at meeting nutritional demands over a range of prey sizes. 5. While reasons for the recent extinction of the Serengeti wild dog population remain speculative, this paper contributes lo the debate by proposing that Kleptoparasitism by spotted hyenas would have placed a major constraint on the ability of individual wild dog packs to recover from episodic disasters.
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Feeding success in African wild dogs : does Kleptoparasitism by spotted hyenas influence hunting group size ?
The Journal of Animal Ecology, 1997Co-Authors: Chris Carbone, J. T. Du Toit, Iain J. GordonAbstract:1. Group hunting in social carnivores is generally thought to have evolved through natural selection for improved efficiency of prey capture, increased prey size apprehended or defence of the kill against intra- and interspecific Kleptoparasitism. 2. We used a simple model to explore how variation in hunting group size or wild dogs in the Serengeti influences defence of kills against Kleptoparasitism from spotted hyenas and the trade-off effects this has on intake rate per dog for a given prey size selected. 3. The analysis presented suggests that while Kleptoparasitism substantially influences the amount of time a hunting group can access a kill, increases in access rime with increased hunting group size rarely fully compensate Cor the reduction in each dog's share of the carcass due to scramble competition among the dogs. 4. A profitability index, which includes limitations of the probability of capturing different sized prey, gut capacity, food depletion and access time, suggests that small hunting groups (1-2) would be particularly vulnerable to Kleptoparasitism because they are usable to fully satiate themselves before spotted hyenas take over their kills. Intermediate-sized hunting groups may be most effective at meeting nutritional demands over a range of prey sizes. 5. While reasons for the recent extinction of the Serengeti wild dog population remain speculative, this paper contributes lo the debate by proposing that Kleptoparasitism by spotted hyenas would have placed a major constraint on the ability of individual wild dog packs to recover from episodic disasters.
Marco Favero - One of the best experts on this subject based on the ideXlab platform.
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Intraspecific Kleptoparasitism improves chick growth and reproductive output in Common Terns Sterna hirundo
Ibis, 2013Co-Authors: Germán Oscar García, Peter H. Becker, Marco FaveroAbstract:Kleptoparasitism is a well-known foraging strategy used opportunistically by many seabirds. Here, we investigated the effect of intraspecific Kleptoparasitism on chick growth and reproductive output in Common Terns Sterna hirundo. Effects were compared between two groups comprising (1) individuals using Kleptoparasitism during the chick-rearing period (kleptoparasitic group, n = 18), and (2) individuals in pairs that never performed Kleptoparasitism throughout the season (‘honest’ group, n = 21). The null models best described variation in mass at day 3 and the pre-fledging mass, indicating no significant effect of the explanatory variables. However, the best models describing the linear growth rate (days 3–13) and peak mass included the parents' foraging strategy (kleptoparasitic vs. honest parents) as an explanatory variable. These two growth parameters were higher in chicks of kleptoparasitic parents. Kleptoparasitic foraging strategy was also associated with higher pre-fledging survival, as the reproductive performance (i.e. number of fledglings) was significantly higher in the kleptoparasitic than in the honest group. We suggest that by stealing food (and consequently feeding offspring more frequently with high-quality prey), kleptoparasitic parents are able to produce higher quality chicks with enhanced survival.
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Kleptoparasitism during courtship in Sterna hirundo and its relationship with female reproductive performance
Journal of Ornithology, 2010Co-Authors: Germán Oscar García, Peter H. Becker, Marco FaveroAbstract:Kleptoparasitism is a well-known foraging tactic used opportunistically by many seabird species. However, little is known about this behaviour during the early stages of the breeding cycle and its effects on breeding performance. Here, we investigated the relationship between Kleptoparasitism during the courtship period and female reproductive performance in Common Terns (Sterna hirundo). All identified kleptoparasites were males, and none of their mates performed such behaviour. We compared two groups of tern pairs, one where the males performed Kleptoparasitism (kleptoparasitic group, n = 10), the other one where both mates were non-kleptoparasitic (honest group, n = 22). The body mass of kleptoparasitic females was between 8 and 15% higher than that of honest females. In kleptoparasitic females, the third egg was significantly bigger than in honest birds, and the egg-volume was not significantly different between the three eggs of the clutch in contrast to honest birds. We found no differences in the comparison among hatching success between both groups. The reproductive output, however, was significantly higher in the kleptoparasitic than in the honest group. Hence, we are providing the first evidence that Kleptoparasitism during early stages of the breeding cycle has a strong link with egg size and reproductive output in Common Terns.
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FACTORS AFFECTING Kleptoparasitism BY GULLS IN A MULTI-SPECIES SEABIRD COLONY
The Condor, 2010Co-Authors: Germán Oscar García, Marco Favero, Aldo Iván VassalloAbstract:Abstract. Kleptoparasitism is defined as the stealing by one animal of food that has been caught by another. It is a well-known foraging tactic used opportunistically by many seabirds. Our study describes qualitatively and quantitatively Kleptoparasitism of gulls on terns and compares the effect of prey quality (prey type and size) and environmental conditions (tide, wind direction and intensity) triggering such behavior. The rate of Kleptoparasitism by Kelp Gulls (Larus dominicanus) was higher on Royal (Thalasseus maximus) than on Cayenne Terns (T. sandvicensis eurygnatha). However, the percentage of successful attacks on both species was similar (∼42%). We used an information-theoretic approach to determine the relative importance of prey quality and environmental conditions in triggering Kleptoparasitism. We found that more valuable prey triggered Kleptoparasitism whereas the environmental conditions included in the models didn't affect the rate of such behavior significantly. Our study shows the impor...
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Kleptoparasitism by Brown-hooded Gulls and Grey-hooded Gulls on American Oystercatchers
Waterbirds, 2002Co-Authors: Camilo E. Khatchikian, Marco Favero, Aldo Iván VassalloAbstract:Abstract This study describes qualitatively and quantitatively the kleptoparasitic behavior of the Brown-hooded Gull (Larus maculipennis) and Grey-hooded Gull (Larus cirrocephalus) on the American Oystercatcher (Haematopus palliatus), and considers the influence of environmental variables on the occurrence and success of the Kleptoparasitism. Focal and scan samplings were performed, recording a total of 358 kleptoparasitic attempts. The overall occurrence rate was 1.2 ± 1.3 attempts per 5 min., of which 42% of attempts were successful. All kleptoparasitic attempts were performed when oystercatchers were feeding on Stout Razor Clams (Tagellus plebeius). Gulls stole food from Oystercatchers by two kleptoparasitic tactics; running (used in 40% of cases) and flying (used in 60% of cases). A significant difference in the rate of success of Kleptoparasitism and an increase in the use of flying Kleptoparasitism were observed under windy conditions. Gulls showed limited ability to open clams by themselves, and ne...
J. T. Du Toit - One of the best experts on this subject based on the ideXlab platform.
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feeding success in african wild dogs does Kleptoparasitism by spotted hyenas influence hunting group size
Journal of Animal Ecology, 1997Co-Authors: Chris Carbone, J. T. Du Toit, Iain J. GordonAbstract:1. Group hunting in social carnivores is generally thought to have evolved through natural selection for improved efficiency of prey capture, increased prey size apprehended or defence of the kill against intra- and interspecific Kleptoparasitism. 2. We used a simple model to explore how variation in hunting group size or wild dogs in the Serengeti influences defence of kills against Kleptoparasitism from spotted hyenas and the trade-off effects this has on intake rate per dog for a given prey size selected. 3. The analysis presented suggests that while Kleptoparasitism substantially influences the amount of time a hunting group can access a kill, increases in access rime with increased hunting group size rarely fully compensate Cor the reduction in each dog's share of the carcass due to scramble competition among the dogs. 4. A profitability index, which includes limitations of the probability of capturing different sized prey, gut capacity, food depletion and access time, suggests that small hunting groups (1-2) would be particularly vulnerable to Kleptoparasitism because they are usable to fully satiate themselves before spotted hyenas take over their kills. Intermediate-sized hunting groups may be most effective at meeting nutritional demands over a range of prey sizes. 5. While reasons for the recent extinction of the Serengeti wild dog population remain speculative, this paper contributes lo the debate by proposing that Kleptoparasitism by spotted hyenas would have placed a major constraint on the ability of individual wild dog packs to recover from episodic disasters.
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Feeding success in African wild dogs : does Kleptoparasitism by spotted hyenas influence hunting group size ?
The Journal of Animal Ecology, 1997Co-Authors: Chris Carbone, J. T. Du Toit, Iain J. GordonAbstract:1. Group hunting in social carnivores is generally thought to have evolved through natural selection for improved efficiency of prey capture, increased prey size apprehended or defence of the kill against intra- and interspecific Kleptoparasitism. 2. We used a simple model to explore how variation in hunting group size or wild dogs in the Serengeti influences defence of kills against Kleptoparasitism from spotted hyenas and the trade-off effects this has on intake rate per dog for a given prey size selected. 3. The analysis presented suggests that while Kleptoparasitism substantially influences the amount of time a hunting group can access a kill, increases in access rime with increased hunting group size rarely fully compensate Cor the reduction in each dog's share of the carcass due to scramble competition among the dogs. 4. A profitability index, which includes limitations of the probability of capturing different sized prey, gut capacity, food depletion and access time, suggests that small hunting groups (1-2) would be particularly vulnerable to Kleptoparasitism because they are usable to fully satiate themselves before spotted hyenas take over their kills. Intermediate-sized hunting groups may be most effective at meeting nutritional demands over a range of prey sizes. 5. While reasons for the recent extinction of the Serengeti wild dog population remain speculative, this paper contributes lo the debate by proposing that Kleptoparasitism by spotted hyenas would have placed a major constraint on the ability of individual wild dog packs to recover from episodic disasters.
Pablo Yorio - One of the best experts on this subject based on the ideXlab platform.
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trophic interactions between the kelp gull larus dominicanus and royal and cayenne terns thalasseus maximus maximus and thalasseus sandvicensis eurygnathus respectively in a human modified environment
Canadian Journal of Zoology, 2019Co-Authors: Cristian Marinao, Nicolas Suarez, Pablo YorioAbstract:Many closely related seabirds nest in mixed colonies, and this association may result in interspecific interactions such as competition for common resources and Kleptoparasitism. Trophic interactio...