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Author |
Woodward Sl, |
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Title  |
Population dynamics of a herd of feral burros (Abstract) |
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1979 |
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Symposium on the Ecology and Behavior of wild and feral Equids, Laramie |
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219-220 |
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from Professor Hans Klingels Equine Reference List |
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1719 |
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Author |
Keiper Rr, |
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Title |
Population dynamics of feral ponies. |
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1979 |
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Symposium on the Ecology and Behavior of wild and feral Equids |
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175-184 |
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Symposium on the Ecology and Behavior of wild and feral Equids |
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Laramie |
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from Professor Hans Klingels Equine Reference List |
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no |
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1252 |
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Author |
Wolfe Ml, |
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Title |
Population ecology of the kulan |
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1979 |
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Symposium on the Ecology and Behavior of wild and feral Equids, Laramie |
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205-218 |
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from Professor Hans Klingels Equine Reference List |
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1716 |
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James, R.; Croft, D.; Krause, J. |
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Title |
Potential banana skins in animal social network analysis |
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2009 |
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Behavioral Ecology and Sociobiology |
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Behav. Ecol. Sociobiol. |
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63 |
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7 |
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989-997-997 |
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Biomedical and Life Sciences |
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Social network analysis is an increasingly popular tool for the study of the fine-scale and global social structure of animals. It has attracted particular attention by those attempting to unravel social structure in fission–fusion populations. It is clear that the social network approach offers some exciting opportunities for gaining new insights into social systems. However, some of the practices which are currently being used in the animal social networks literature are at worst questionable and at best over-enthusiastic. We highlight some of the areas of method, analysis and interpretation in which greater care may be needed in order to ensure that the biology we extract from our networks is robust. In particular, we suggest that more attention should be given to whether relational data are representative, the potential effect of observational errors and the choice and use of statistical tests. The importance of replication and manipulation must not be forgotten, and the interpretation of results requires care. |
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Springer Berlin / Heidelberg |
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0340-5443 |
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Equine Behaviour @ team @ |
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5206 |
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Author |
Rosell, F.; Sanda, J.I. |
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Title |
Potential risks of olfactory signaling: the effect of predators on scent marking by beavers |
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Year |
2006 |
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Behavioral Ecology |
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Behav. Ecol. |
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17 |
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6 |
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897-904 |
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Mammals scent mark their territories to advertise occupancy and ownership. However, signaling with scent for territorial defense can have a negative effect by advertising an individual's presence and location to predators. In this study, we measured responses to a simulated territorial intrusion by conspecific adult male Eurasian beavers (Castor fiber) either in the localized presence or in the absence of odor of a predator to test the hypothesis that the territorial defense of free-living beavers would be disrupted by the presence of predation risk in their natural environment. We predicted that beavers would significantly reduce their willingness to countermark intruder's scent in the presence of the scent of predators (wolf [Canis lupus] and lynx [Lynx lynx]), compared with a control (no odor), as responses are in general stronger to predator scent marks than nonpredator scent. Therefore, we also predicted that the effects of nonpredatory mammal scent (neophobic control) (eland [Taurotragus oryx] and horse [Equus cabalus]) are to be expected somewhere in between the effects of the predator odor and a control. Our results suggest that both predator and nonpredator scents reduce beavers response to a simulated intruder's scent mounds and therefore disrupt their territorial defense. However, predator scent had a stronger effect than nonpredator scent. Beavers may therefore be at great risk on territories with predators present because of the trade-off between predator avoidance and territorial defense. Our study demonstrates the potential of predation risk as a powerful agent of counterselection on olfactory signaling behavior. |
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10.1093/beheco/arl022 |
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Equine Behaviour @ team @ |
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4359 |
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Author |
Lima, S.L. |
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Title |
Predation Risk and Unpredictable Feeding Conditions: Determinants of Body Mass in Birds |
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Year |
1986 |
Publication |
Ecology |
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Ecology |
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67 |
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2 |
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377-385 |
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doi: 10.2307/1938580 |
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Equine Behaviour @ team @ |
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5141 |
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Mills, M.G.L.; Shenk, M.G.L. |
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Predator--Prey Relationships: The Impact of Lion Predation on Wildebeest and Zebra Populations |
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Journal Article |
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Year |
1992 |
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The Journal of Animal Ecology |
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T. J. Anim. Ecol. |
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61 |
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3 |
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693-702 |
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1. The role of lion Panthera leo predation in the dynamics of blue wildebeest Connochaetes taurinus and zebra Equus burchelli populations was investigated through simulation models. The data used in the models were from intensive observations over 4 years in the south-east of the Kruger National Park. 2. Population estimates of wildebeest and zebra were made from aerial surveys, sex and age ratios from ground counts. Lion numbers were determined from observations of marked and radio-collared animals. Predation was studied by following lions for continuous periods of up to 336 h. 3. Two models were constructed. Model 1 ascertained the number of killing lions (adult females) that could be supported by each prey population while remaining stable. A single model was constructed for the sedentary wildebeest population. A summer and winter model was constructed for the semi-migratory zebra population. The sensitivity of the parameters in the model was tested by changing their value by 10%. In model 2, the kill age structure for each species was changed to determine the number of killing lions the altered prey selection parameters could support. 4. There was no difference in the vulnerability of either species to predation. Zebra foals (<1 year) were killed more frequently than expected. No selection for sex or by season could be found for either species. 5. Model 1 predicted that the wildebeest population stabilizes with 7.7 killing lions, close to the number in the study area. The winter zebra population stabilizes with 6.8 killing lions and the summer zebra population with 19.4. Manipulation of kill rate followed by adult fecundity rate had the greatest effect on population size of both species. In model 2, wildebeest predation was made selective towards calves and zebra predation was made non-selective for sex and age. With these parameters the wildebeest population stabilizes with 10.7 killing lions and the zebra population with 5.4 in winter and 15.1 in summer. 6. The models suggest that lion predation affected wildebeest more severely than zebra during the study. This was through the way in which lions selected their prey, and because of the sedentary behaviour of the wildebeest, as opposed to the semi-migratory behaviour of the zebra. |
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Equine Behaviour @ team @ |
Serial |
2376 |
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Author |
Zuberbühler, K. |
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Title |
Predator-specific alarm calls in Campbell's monkeys, Cercopithecus campbelli |
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Journal Article |
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2001 |
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Behavioral Ecology and Sociobiology |
Abbreviated Journal |
Behav. Ecol. Sociobiol. |
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50 |
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5 |
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414-422 |
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One of the most prominent behavioural features of many forest primates are the loud calls given by the adult males. Early observational studies repeatedly postulated that these calls function in intragroup spacing or intergroup avoidance. More recent field experiments with Diana monkeys (Cercopithecus diana) of Taï Forest, Ivory Coast, have clearly shown that loud male calls function as predator alarm calls because calls reliably (1) label different predator classes and (2) convey semantic information about the predator type present. Here, I test the alarm call hypothesis another primate, the Campbell's monkey (C. campbelli). Like Diana monkeys, male Campbell's monkeys produce conspicuous loud calls to crowned hawk eagles (Stephanoaetus coronatus) and leopards (Panthera pardus), two of their main predators. Playback experiments showed that monkeys responded to the predator category represented by the different playback stimuli, regardless of whether they consisted of (1) vocalisations of the actual predators (crowned hawk eagle shrieks or leopard growls), (2) alarm calls to crowned hawk eagles or leopards given by other male Campbell's monkeys or (3) alarm calls to crowned hawk eagles or leopards given by sympatric male Diana monkeys. These experiments provide further evidence that non-human primates have evolved the cognitive capacity to produce and respond to referential labels for external events. |
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Equine Behaviour @ team @ |
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3116 |
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Author |
Polyanskaya, A.I.; Ovchinnikov, V.V. |
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Rate of growth and size of the brain of the horse mackerel |
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1974 |
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The Soviet Journal of Ecology |
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Sov J Ecol |
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4 |
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3 |
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256-257 |
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Animals; Body Weight; *Brain; Ecology; Fishes/*growth & development; Genetics, Population; Organ Size |
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English |
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0096-7807 |
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PMID:4825911 |
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Equine Behaviour @ team @ |
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2708 |
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Krause, J.; Bumann, D.; Todt, D. |
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Relationship between the position preference and nutritional state of individuals in schools of juvenile roach (Rutilus rutilus) |
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1992 |
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Behavioral Ecology and Sociobiology |
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Behav. Ecol. Sociobiol. |
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30 |
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3 |
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177-180 |
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Position preferences of well-fed and food-deprived juvenile roach were investigated in schools of 2 and 4 fish in the laboratory. Food-deprived fish appeared significantly more often in the front position than their well-fed conspecifics. For fish at the same hunger level, individuals at the front of the school had the highest feeding rate. These results represent the first evidence for a relationship between the nutritional state of individual fish and their positions in a school and suggest a functional advantage of the preference. |
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Equine Behaviour @ team @ |
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5140 |
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