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Dugatkin, L.A.; Godin, G.J. |
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Title |
Predator inspection, shoaling and foraging under predation hazard in the Trinidadian guppy,Poecilia reticulata |
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Year |
1992 |
Publication |
Environmental Biology of Fishes |
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34 |
Issue |
3 |
Pages |
265-276 |
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Antipredation – Social group – Feeding – Predation risk – Trade-off – Fish |
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Abstract |
Guppies,Poecilia reticulata, living in stream pools in Trinidad, West Indies, approached a potential fish predator (a cichlid fish model) in a tentative, saltatory manner, mainly as singletons or in pairs. Such behavior is referred to as predator inspection behavior. Inspectors approached the trunk and tail of the predator model more frequently, more closely and in larger groups than they approached the predator's head, which is presumably the most dangerous area around the predator. However, guppies were not observed in significantly larger shoals in the stream when the predator model was present. In a stream enclosure, guppies inspected the predator model more frequently when it was stationary compared to when it was moving, and made closer inspections to the posterior regions of the predator than to its head. Therefore, the guppies apparently regarded the predator model as a potential threat and modified their behavior accordingly when inspecting it. Guppies exhibited a lower feeding rate in the presence of the predator, suggesting a trade-off between foraging gains and safety against predation. Our results further suggest that predator inspection behavior may account for some of this reduction in foraging. These findings are discussed in the context of the benefits and costs of predator inspection behavior. |
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Equine Behaviour @ team @ |
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2176 |
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Author |
Pruett-Jones, S. |
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Title |
Independent Versus Nonindependent Mate Choice: Do Females Copy Each Other? |
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Year |
1992 |
Publication |
The American Naturalist |
Abbreviated Journal |
Am Nat |
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Volume |
140 |
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6 |
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1000-1009 |
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There is increasing evidence from both observational and experimental studies that females may copy each other's mating decisions. Female copying can be defined as a type of nonindependent choice in which the probability that a female chooses a given male increases if other females have chosen that male and decreases if they have not. The important characteristic of copying behavior that separates it from other similar processes is that the change in the probability of choice is strictly because of the actions of other females and not the consequences of those actions (e.g., a male's behavior changing as a result of successful matings). A gametheory model suggests that the adaptive significance of female copying may depend primarily on the ratio of the costs to the benefits of active mate choice. Copying behavior, and more generally conspecific cueing, may be important in many behavioral processes beyond mate choice. |
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Equine Behaviour @ team @ |
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2182 |
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Author |
Smith-Funk, E.D.; Crowell-Davis, S.L. |
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Title |
Maternal behavior of draft mares (Equus caballus) with mule foals (Equus asinus x Equus caballus) |
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Journal Article |
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Year |
1992 |
Publication |
Applied Animal Behaviour Science |
Abbreviated Journal |
Appl. Anim. Behav. Sci. |
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33 |
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2-3 |
Pages |
93-119 |
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Draft mares and their mule foals were observed from the day of birth to Week 17 of each foal's life. The rate of nursing was recorded and the duration of nursing activity to the nearest second. The rate at which foals engaged in nursing activity varied at each age. The duration of nursing bouts varied slightly as the foals matured. Aggression was recorded during both nursing and non-nursing activity for both the mares and foals. Maternal aggression was highest during nursing activity, especially during the pre-nurse nuzzling period. Maternal aggression increased as the foals matured. Mother-directed foal aggression was primarily in response to maternal aggression. Spatial relationships between each focal dyad were recorded when the foals were upright, not nursing and when they were recumbent. Spatial relationships differed based on the foal's state. The activity in which the mare engaged while her foal was recumbent was recorded. The movements of the mares were also recorded during foal recumbency. Mares approached or maintained their distance from their recumbent foal more than they left their recumbent foal in all weeks of the study, except Week 2. |
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Equine Behaviour @ team @ |
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2272 |
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Author |
Dvoinos, G.M.; Kharchenko, V.A.; Zviagnitsova, N.S. |
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Title |
The characteristics of the helminth community in the Turkmen kulan (Equus hemionus) |
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Journal Article |
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Year |
1992 |
Publication |
Parazitologiia |
Abbreviated Journal |
Parazitologiia |
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Volume |
26 |
Issue |
3 |
Pages |
246-251 |
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Keywords |
Animals; Female; Helminthiasis/parasitology; Helminthiasis, Animal; Helminths/classification/*isolation & purification; Male; Perissodactyla/*parasitology; Turkmenistan; Ukraine |
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The helminth fauna of 24 kulans from Askaniya-Nova and Badkhyz was studied. 42 species of helminths were found, 34 of which belong to strongylids. The helminth species composition of kulan is similar to that of other species of horses. This is a result of an intensive parasite exchange in the historical past when numerous populations of different Equidae species made long seasonal migrations over steppe inter-river lands of Asia and grazed for some time on common pastures. |
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Russian |
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K kharakteristike soobshchestva gel'mintov turkmenskogo kulana (Equus hemionus) |
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0031-1847 |
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PMID:1408368 |
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Call Number |
Equine Behaviour @ team @ |
Serial |
2285 |
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Author |
Mills, M.G.L.; Shenk, M.G.L. |
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Title |
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 |
Publication |
The Journal of Animal Ecology |
Abbreviated Journal |
T. J. Anim. Ecol. |
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Volume |
61 |
Issue |
3 |
Pages |
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 |
Munthali, S.M.; Banda, H.M. |
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Title |
Distribution and abundance of the common ungulates of Nyika National Park |
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Journal Article |
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Year |
1992 |
Publication |
Afr. J. Ecol |
Abbreviated Journal |
Afr. J. Ecol |
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30 |
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203-212 |
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Equine Behaviour @ team @ |
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2390 |
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Author |
Eisgruber, H.; Stolle, F.A. |
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Title |
[Clostridia in carcasses and fresh meat--a literature review] |
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Journal Article |
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Year |
1992 |
Publication |
Zentralblatt fur Veterinarmedizin. Reihe B. Journal of Veterinary Medicine. Series B |
Abbreviated Journal |
Zentralbl Veterinarmed B |
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39 |
Issue |
10 |
Pages |
746-754 |
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Keywords |
Abattoirs; Animals; Cattle; Clostridium/*growth & development; *Food Microbiology; Horses; Meat/*microbiology; Muscles/*microbiology; Sheep; Swine |
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Clostridia are of large clinical importance as well as in the field of food hygiene, where they are responsible for spoilage but they also have a certain significance as food poisoning organisms. Information on the ecology of Clostridia in samples of deep muscle tissue of slaughtered animals is insufficient. This article is intended to increase the knowledge on the occurrence of different Clostridia species in slaughtered animals. The main emphasis is put on the significance of clostridia in meat hygiene. The theoretical basis of the so called original content of microorganisms (intrinsic bacteria), the factors and pathways of Clostridia spreading in muscles and organs are demonstrated. |
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Institut fur Hygiene und Technologie, Ludwig-Maximilians-Universitat Munchen |
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German |
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Clostridien in Schlachttierkorpern und frischem Fleisch--Eine Literaturubersicht |
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0514-7166 |
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PMID:1492516 |
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Equine Behaviour @ team @ |
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2668 |
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Author |
Bazovska, S.; Awad-Masalmeh, M.; Kmety, E.; Spalekova, M. |
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Title |
[Legionella antibodies in domestic animals] |
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Journal Article |
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Year |
1992 |
Publication |
Ceskoslovenska Epidemiologie, Mikrobiologie, Imunologie |
Abbreviated Journal |
Cesk Epidemiol Mikrobiol Imunol |
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41 |
Issue |
5 |
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268-273 |
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Agglutination Tests/veterinary; Animals; Animals, Domestic/*immunology/microbiology; Antibodies, Bacterial/*analysis; Cattle/immunology; Horses/immunology; Legionella/*immunology; Legionella pneumophila/immunology; Rabbits/immunology; Sheep/immunology; Swine/immunology |
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Serological examination of 420 domestic animals for the presence of antilegionella antibodies indicates their high exposure to legionellae. On examination by the microagglutination reaction with a serum dilution of 1:64 or more the highest positive values were recorded in horses which reacted with antigens of L. pneumophila 1-14 in 36.2% and with antigens of another 19 types of legionellae in 47.8%. In pigs positive values recorded in 16.2% and in 21.1%; in cattle in 3.8% and 29.5%, in sheep in 7.5% and 11.3% and laboratory rabbits were quite negative. The importance of these findings with regard to the possible role of animals in the ecology of legionellae is obscure. |
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Ustav epidemiologie Lekarskej fakulty UK v Bratislave |
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Protilatky proti legionelam u domacich zvierat |
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0009-0522 |
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PMID:1464079 |
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Equine Behaviour @ team @ |
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2669 |
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Author |
Cheney DL; Seyfarth RM |
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Title |
Characterizing the mind of another species |
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1992 |
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Behav. Brain Sci. |
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15 |
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172 |
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Equine Behaviour @ team @ |
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2988 |
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Author |
Lin AC; Bard KA; Anderson JR |
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Title |
Development of self-recognition and self-conscious emotions |
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1992 |
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Child Dev. |
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106 |
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120 |
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Equine Behaviour @ team @ |
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3016 |
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