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Author |
Kacelnik, A. |
Title |
R.C. Bolies and M.D. Beecher, Editors, Evolution and Learning, Lawrence Erlbaum, Hillsdale, New Jersey (1988), p. x |
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Journal Article |
Year |
1990 |
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Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
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40 |
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3 |
Pages |
602-603 |
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2119 |
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Cassini, M.H.; Kacelnik, A.; Segura, E.T. |
Title |
The tale of the screaming hairy armadillo, the guinea pig and the marginal value theorem |
Type |
Journal Article |
Year |
1990 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
Volume |
39 |
Issue |
6 |
Pages |
1030-1050 |
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Abstract |
Foraging by screaming hairy armadillos, Chaetophractus vellerosus, and guinea pigs, Cavia porcellus, was studied in the laboratory. The main question was whether patch exploitation varies with overall capture rate as predicted by the marginal value theorem (MVT). Armadillos in experiment I and guinea pigs in experiment II experienced a single travel time between depleting patches of two kinds: good and poor. There were two treatments, which differed in the quality of poor patches. MVT predicts that within a treatment, more prey should be taken from good than from poor patches and between treatments, good patches should be exploited in inverse relation to the quality of poor patches and poor patches should be exploited in direct relation to their own quality. In experiment III, guinea pigs experienced three treatments which differed in the travel requirement, while the two patch types remained the same. MVT predicts that within a treatment more prey should be taken from good than from poor patches and that between treatments more prey should be taken from both patch types as travel requirement increases. The qualitative predictions were supported in the three experiments. The quantitative fit was good but there was a bias towards more severe patch exploitation than predicted. The results indicate that in these species patch exploitation depends on overall food availability as predicted by the MVT when overall food availability differs either because of patch type composition or because of differences in travel requirement between patches. |
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2120 |
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Author |
Kacelnik, A. |
Title |
Information primacy or preference for familiar foraging techniques? A critique of Inglis & Ferguson |
Type |
Journal Article |
Year |
1987 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
Volume |
35 |
Issue |
3 |
Pages |
925-926 |
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2121 |
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Author |
Kacelnik, A.; Houston, A.I. |
Title |
Some effects of energy costs on foraging strategies |
Type |
Journal Article |
Year |
1984 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
Volume |
32 |
Issue |
2 |
Pages |
609-614 |
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We consider the effect of including energy costs on the optimal strategy for animals exploiting a depleting food resource. In the context of central place foraging this leads to the problem of what load size should be brought back to the central place. Two strategies are discussed: (i) maximize gross rate of energy delivery and (ii) maximize net rate of energy delivery. The optimal load size (or optimal patch time) for net maximizers is not always larger than for gross maximizers, as has been claimed. Instead, the difference in optimal load size has the same sign as the difference between metabolic rates of travelling and foraging. We point out that the influence of costs has not always been correctly incorporated in experimental tests of the theory. |
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2122 |
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Roberts, J.; Hunter, M.L.; Kacelnik, A. |
Title |
The ground effect and acoustic communication |
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Journal Article |
Year |
1981 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
Volume |
29 |
Issue |
2 |
Pages |
633-634 |
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2123 |
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Roberts, J.; Kacelnik, A.; Hunter, M.L. |
Title |
A model of sound interference in relation to acoustic communication |
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Journal Article |
Year |
1979 |
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Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
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27 |
Issue |
Part 4 |
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1271-1273 |
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2124 |
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Kacelnik, A. |
Title |
The foraging efficiency of great tits (Parus major L.) in relation to light intensity |
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Journal Article |
Year |
1979 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
Volume |
27 |
Issue |
Part 1 |
Pages |
237-241 |
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I report an experiment aimed at testing whether foraging efficiency of great tits is limited by light intensity at the time of the dawn chorus. Captive great tits hunting for prey under different luminance conditions were less successful in finding prey when foraging, hunted for a lower proportion of their time, and handled individual prey items for longer when luminance was under approximately 7 cd/m2. This luminance is not reached in the field until after the time of the dawn chorus, suggesting that in the early morning foraging is limited by light intensity. I suggest that a satisfactory functional explanation of the dawn chorus must take into account the comparatively low foraging opportunity early in the morning, as well as the factors affecting the opportunity for singing and other territorial activities. |
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2125 |
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Author |
Astié, A.A.; Kacelnik, A.; Reboreda, J.C. |
Title |
Sexual differences in memory in shiny cowbirds |
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Journal Article |
Year |
1998 |
Publication |
Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
Volume |
1 |
Issue |
2 |
Pages |
77-82 |
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Abstract |
Avian brood parasites depend on other species, the hosts, to raise their offspring. During the breeding season, parasitic cowbirds (Molothrus sp.) search for potential host nests to which they return for laying a few days after first locating them. Parasitic cowbirds have a larger hippocampus/telencephalon volume than non-parasitic species; this volume is larger in the sex involved in nest searching (females) and it is also larger in the breeding than in the non-breeding season. In nature, female shiny cowbirds Molothrus bonariensis search for nests without the male's assistance. Here we test whether, in association with these neuroanatomical and behavioural differences, shiny cowbirds display sexual differences in a memory task in the laboratory. We used a task consisting of finding food whose location was indicated either by the appearance or the location of a covering disk. Females learnt to retrieve food faster than males when food was associated with appearance cues, but we found no sexual differences when food was associated with a specific location. Our results are consistent with the view that parasitism and its neuroanatomical correlates affect performance in memory tasks, but the effects we found were not in the expected direction, emphasising that the nature of avian hippocampal function and its sexual differences are not yet understood. |
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Equine Behaviour @ team @ |
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3158 |
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