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Predator Inspection Behaviour Covaries With Schooling Tendency Amongst Wild Guppy, Poecilia Reticulata, Populations in Trinidad

Predator Inspection Behaviour Covaries With Schooling Tendency Amongst Wild Guppy, Poecilia... <jats:sec><jats:title>Abstract</jats:title><jats:p>When fish inspect a predator they incur risk. One way of reducing the cost of inspection is to approach predators in groups large enough to benefit from the safety in numbers advantages of schooling. In a survey of nine populations of guppies, Poecilia reticulata, in their native streams in Trinidad, we observed marked variation in schooling behaviour. Guppies from sites also inhabited by a major predator, the pike cichlid, Crenicichla alta, devoted more time to schooling than those from less dangerous locations where the cyprinodont Rivulus hartii was present. We found a strong correlation between schooling tendency and the group sizes adopted by guppies inspecting a realistic model predator. Since guppies in dangerous localities approached a potential predator in large groups it seems unlikely that many of these fish were caught in a Prisoner's Dilemma. Inspections by singleton fish were rare in high-risk locations but predominated in those populations where risk from fish predators was reduced.</jats:p> </jats:sec> http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Behaviour Brill

Predator Inspection Behaviour Covaries With Schooling Tendency Amongst Wild Guppy, Poecilia Reticulata, Populations in Trinidad

Behaviour , Volume 128 (1-2): 121 – Jan 1, 1994

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References (25)

Publisher
Brill
Copyright
© 1994 Koninklijke Brill NV, Leiden, The Netherlands
ISSN
0005-7959
eISSN
1568-539X
DOI
10.1163/156853994X00073
Publisher site
See Article on Publisher Site

Abstract

<jats:sec><jats:title>Abstract</jats:title><jats:p>When fish inspect a predator they incur risk. One way of reducing the cost of inspection is to approach predators in groups large enough to benefit from the safety in numbers advantages of schooling. In a survey of nine populations of guppies, Poecilia reticulata, in their native streams in Trinidad, we observed marked variation in schooling behaviour. Guppies from sites also inhabited by a major predator, the pike cichlid, Crenicichla alta, devoted more time to schooling than those from less dangerous locations where the cyprinodont Rivulus hartii was present. We found a strong correlation between schooling tendency and the group sizes adopted by guppies inspecting a realistic model predator. Since guppies in dangerous localities approached a potential predator in large groups it seems unlikely that many of these fish were caught in a Prisoner's Dilemma. Inspections by singleton fish were rare in high-risk locations but predominated in those populations where risk from fish predators was reduced.</jats:p> </jats:sec>

Journal

BehaviourBrill

Published: Jan 1, 1994

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