| Records |
| Author |
Cameron EZ, Linklater WL. |
Title  |
Individual mares bias investment in sons and daughters in relation to their condition |
Type |
Journal Article |
| Year |
2000 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
| Volume |
60 |
Issue |
3 |
Pages |
359-367 |
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| Abstract |
The Trivers-Willard hypothesis (TWH) predicts that a mother will treat a son or daughter differently depending on her ability to invest and the impact of her investment on offspring reproductive success. Although many studies have investigated the hypothesis, few have definitively supported or refuted it because of confounding factors or an inappropriate level of analysis. We studied maternal investment in sons and daughters in feral horses, Equus caballus, which meet the assumptions of the TWH with a minimum of confounding variables. Population level analyses revealed no differences in maternal behaviour towards sons and daughters. When we incorporated mare condition, we found that sons were more costly to mares in good condition, whereas daughters were more costly to mares in poor condition, although no differences in maternal behaviour were found. However, since the TWH makes predictions about individual mothers, we examined investment by mares who reared both a son and a daughter in different years of the study. Mares in good condition invested more in their sons in terms of maternal care patterns, costs to maternal body condition and costs to future reproduction. Conversely, mares in poor condition invested more in daughters. Therefore, with an appropriate level of analysis in a species in which confounding variables are minimal, the predictions of the Trivers-Willard hypothesis are supported. Copyright 2000 The Association for the Study of Animal Behaviour. |
| Address |
Ecology Group, Institute of Natural Resources, Massey University |
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English |
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0003-3472 |
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PMID:11007645 |
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no |
| Call Number |
refbase @ user @ |
Serial |
416 |
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| Author |
Beauchamp, G. |
| Title |
Individual Differences In Activity And Exploration Influence Leadership In Pairs Of Foraging Zebra Finches |
Type |
Journal Article |
| Year |
2000 |
Publication |
Behaviour |
Abbreviated Journal |
Behaviour |
| Volume |
137 |
Issue |
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Pages |
301-314 |
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| Abstract |
This study investigated the role of dominance and level of activity and exploration on leadership in zebra finches (Taenopygia guttata) searching for food. In pairs of zebra finches fairly matched in size and that experienced the same level of food deprivation, the same bird consistently reached first one foraging patch over several trials. The same pattern of arrival to food occurred when resources were provided in two distant patches available concurrently, a situation that would potentially allow subordinates a greater access to resources. In further testing, the formation of new pairs with the same birds led to several changes in leadership, indicating that leadership is not an absolute feature. The member of a pair that proved to be the most active and exploratory during independent, solitary trials became the leader in nearly all pairs tested. The same pattern held true in newly rearranged pairs where individuals often experienced changes in dominance status. Dominance failed to be associated with leadership in all tests. The results suggest that in a relatively egalitarian species, level of activity and exploration may be a stronger predictor of leadership than dominance. |
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Equine Behaviour @ team @ |
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4698 |
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| Author |
Dyer, F. C. |
| Title |
Individual cognition and group movement: insights from social insects. |
Type |
Book Chapter |
| Year |
2000 |
Publication |
Group Movement in Social Primates and Other Animals: Patterns, Processes, and Cognitive Implications. |
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University of Chicago Press |
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Chicago |
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Garber, P.;Boinski, S. |
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Equine Behaviour @ team @ |
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4425 |
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| Author |
Byrne, R.W. |
| Title |
How monkeys find their way: leadership, coordination, and cognitive maps of African baboons. |
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Book Chapter |
| Year |
2000 |
Publication |
On the Move: How and Why Animals Travel in Groups |
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Pages |
491–518 |
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Chicago University Press |
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Chicago |
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Boinski, S.; Garber, P.A. |
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Equine Behaviour @ team @ |
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5146 |
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| Author |
Sapolsky, R.M.; Romero, L.M.; Munck, A.U. |
| Title |
How Do Glucocorticoids Influence Stress Responses? Integrating Permissive, Suppressive, Stimulatory, and Preparative Actions |
Type |
Journal Article |
| Year |
2000 |
Publication |
Endocr Rev |
Abbreviated Journal |
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| Volume |
21 |
Issue |
1 |
Pages |
55-89 |
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| Abstract |
The secretion of glucocorticoids (GCs) is a classic endocrine response to stress. Despite that, it remains controversial as to what purpose GCs serve at such times. One view, stretching back to the time of Hans Selye, posits that GCs help mediate the ongoing or pending stress response, either via basal levels of GCs permitting other facets of the stress response to emerge efficaciously, and/or by stress levels of GCs actively stimulating the stress response. In contrast, a revisionist viewpoint posits that GCs suppress the stress response, preventing it from being pathologically overactivated. In this review, we consider recent findings regarding GC action and, based on them, generate criteria for determining whether a particular GC action permits, stimulates, or suppresses an ongoing stress-response or, as an additional category, is preparative for a subsequent stressor. We apply these GC actions to the realms of cardiovascular function, fluid volume and hemorrhage, immunity and inflammation, metabolism, neurobiology, and reproductive physiology. We find that GC actions fall into markedly different categories, depending on the physiological endpoint in question, with evidence for mediating effects in some cases, and suppressive or preparative in others. We then attempt to assimilate these heterogeneous GC actions into a physiological whole. |
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10.1210/er.21.1.55 |
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no |
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Equine Behaviour @ team @ |
Serial |
4070 |
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| Author |
Ronald J. Schusterman; Colleen J. Reichmuth; David Kastak |
| Title |
How Animals Classify Friends and Foes |
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Journal Article |
| Year |
2000 |
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Current Directions in Psychological Science |
Abbreviated Journal |
Curr. Dir. Psychol. Sci. |
| Volume |
9 |
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1-6 |
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no |
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refbase @ user @ |
Serial |
3477 |
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| Author |
Mohr, E.; Witte, E.; Voss, B. |
| Title |
Heart rate variability as stress indicator |
Type |
Journal Article |
| Year |
2000 |
Publication |
Archiv fur Tierzucht |
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| Volume |
43 |
Issue |
3 Spec. Iss. |
Pages |
171-176 |
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Cited By (since 1996): 2; Export Date: 21 October 2008 |
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Equine Behaviour @ team @ |
Serial |
4534 |
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| Author |
Holekamp, K.E, Boydston, E.E; Smale, L. |
| Title |
Group Travel in Social Carnivores |
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Book Whole |
| Year |
2000 |
Publication |
On the Move: How and Why Animals Travel in Groups |
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Pages |
587-627 |
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Chicago University Press |
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Chicago |
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Boinski, S.; Garber, P.A. |
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Equine Behaviour @ team @ |
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5147 |
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| Author |
Garber, P.; Boinski, S. |
| Title |
Group Movement in Social Primates and Other Animals: Patterns, Processes, and Cognitive Implications. |
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Book Whole |
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2000 |
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University of Chicago Press |
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Chicago |
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no |
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Equine Behaviour @ team @ |
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5466 |
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| Author |
Houpt, K.; Kusunose, R. |
| Title |
Genetics of behaviour. |
Type |
Book Chapter |
| Year |
2000 |
Publication |
The Genetics of the Horse |
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281-306 |
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CABI Publishing |
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New York |
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Bowling, A.T., Ruvinsky, A. |
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9780851994291 |
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no |
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Equine Behaviour @ team @ |
Serial |
4821 |
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