Dive bout organization in the Chinstrap penguin at seal island, antarctica |
| |
Authors: | Yoshihisa Mori |
| |
Institution: | (1) Department of Zoology, Faculty of Science, Kyoto University, Kitashirakawa, Sakyo, 606-01 Kyoto, Japan |
| |
Abstract: | Diving behavior of 2 breeding Chinstrap penguins (Pygoscelis antarctica) was studied focusing first and primarily on dive bouts rather than dives themselves. Analysis of dive bout organization
revealed (1) though there are differences between solitary dives and dive bouts in dive duration and dive depth, the first
dives of dive bouts do not differ from solitary dives in the dive parameters, (2) mean dive duration during bout correlates
positively to both mean dive depth during bout and mean surface interval during bout, while number of dives during bout negatively
correlates to both cost (consumed energy) and duration of a dive cycle during bout. These findings suggest the following possibilities
on foraging behavior of penguins: (1) their decision to repeat diving depends on the result of the first dive at a site, and
the first dives of bouts would tend to be searching or evaluating dives though they would be also successful foraging dives,
(2) they repeat diving at a foraging patch until foraging efficiency decrease to a threshold of diminishing returns. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|