Hostname: page-component-586b7cd67f-rdxmf Total loading time: 0 Render date: 2024-11-27T14:08:29.025Z Has data issue: false hasContentIssue false

Optimal choice of foraging depth in divers

Published online by Cambridge University Press:  05 April 2001

Yoshihisa Mori
Affiliation:
Department of Zoology, Faculty of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan
Get access

Abstract

When prey availability depends on water depth, a diver should choose an optimal depth for foraging. A model that predicts the optimal foraging depth for a diver is presented in this paper. General predictions derived from the model are: (1) optimal foraging depth is always shallower than the depth at which prey density is the highest, even if the depth of the highest prey density is within easy reach; (2) a larger diver should make deeper and longer dives and stay longer on the surface than smaller divers for optimal foraging; (3) foraging efficiency of larger divers is not always greater than smaller divers, although the larger divers forage at the depth of higher prey density. These predictions, derived from the model, are consistent with the comparative studies of diving behaviour in marine birds.

Type
Research Article
Copyright
1998 The Zoological Society of London

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)