The effect of group size on the foraging behaviour of juvenile coho salmon: reduction of predation risk or increased competition?
Article Abstract:
Animals which forage in groups are apparently willing to incur risks when foraging, probably because their risk of predation is reduced. But, an increase in group size means increased competition for resources and reduced quantity of resources, resulting in individuals increasing their foraging efforts and also increasing risk of predation. A new study investigates the relationship between group size and risk-taking behavior in juvenile coho salmon. It is shown that increased competition for scarce resources is directly linked to increases in risk-taking behaviour.
Publication Name: Animal Behaviour
Subject: Zoology and wildlife conservation
ISSN: 0003-3472
Year: 1999
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Mate choice by female crickets is influenced by predation risk
Article Abstract:
Risk from predators appears to alter mating patterns among female crickets, with females becoming less selective, a finding in line with predictions that the cost of searching for a mate can influence how selective animals are. The experiment used phonotaxis methods, and the preference of female crickets tended to be toward males with long-bout calls. The calls were broadcast from speakers using similar intensities to those found in the wild. The crickets were tested with and without cover, since crickets are more vulnerable to predators on open ground.
Publication Name: Animal Behaviour
Subject: Zoology and wildlife conservation
ISSN: 0003-3472
Year: 1993
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Foraging site selection by juvenile coho salmon: ideal free distributions of unequal competitors
Article Abstract:
Juvenile coho salmon's foraging site selection behavior indicates a relationship between their competitive abilities and the distribution of resources. Groups of juvenile coho salmon with different levels of competitive abilities distribute themselves in such a way as to match the distribution of resources. In a two-patch stream channel environment, the average payoffs per unit of competitive weight are similar for good and poor patches, indicating that competitive abilities are hardly stable across patches.
Publication Name: Animal Behaviour
Subject: Zoology and wildlife conservation
ISSN: 0003-3472
Year: 1997
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