Segregation of foraging between two sympatric penguin species: does rate maximisation make the difference?
Macaroni Eudyptes chrysolophus and gentoo Pygoscelis papua penguins occur sympatrically at Bird Island (54degrees00'S, 38degrees02'W), South Georgia, and have a similar diet. Macaroni penguins forage at shallower depths and further from the island than gentoo penguins. We tested the hypoth...
Published in: | Marine Ecology Progress Series |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Inter-Research
2004
|
Subjects: | |
Online Access: | http://nora.nerc.ac.uk/id/eprint/12304/ http://www.int-res.com/articles/meps2004/275/m275p241.pdf |
id |
ftnerc:oai:nora.nerc.ac.uk:12304 |
---|---|
record_format |
openpolar |
spelling |
ftnerc:oai:nora.nerc.ac.uk:12304 2023-05-15T15:44:42+02:00 Segregation of foraging between two sympatric penguin species: does rate maximisation make the difference? Mori, Yoshihisa Boyd, Ian L. 2004 http://nora.nerc.ac.uk/id/eprint/12304/ http://www.int-res.com/articles/meps2004/275/m275p241.pdf unknown Inter-Research Mori, Yoshihisa; Boyd, Ian L. 2004 Segregation of foraging between two sympatric penguin species: does rate maximisation make the difference? Marine Ecology Progress Series, 275. 241-249. https://doi.org/10.3354/meps275241 <https://doi.org/10.3354/meps275241> Marine Sciences Zoology Ecology and Environment Publication - Article PeerReviewed 2004 ftnerc 2023-02-04T19:27:55Z Macaroni Eudyptes chrysolophus and gentoo Pygoscelis papua penguins occur sympatrically at Bird Island (54degrees00'S, 38degrees02'W), South Georgia, and have a similar diet. Macaroni penguins forage at shallower depths and further from the island than gentoo penguins. We tested the hypothesis that differences in the optimal foraging behaviour at the level of individual dives help to explain this ecological foraging segregation. Using a rate maximising diving model, we predicted that macaroni penguins would obtain more energy per dive cycle than gentoo penguins only when they used patches shallower than 30 to 40 m. This prediction was supported by observations of actual dive depths. We conclude that different foraging efficiencies at different depths results in each species being differentially sensitive to the vertical distribution of prey in the water column. We suggest that differing capacities to exploit natural heterogeneity in the distribution of prey has an important role in maintaining these 2 species as sympatric predators of a common resource. Article in Journal/Newspaper Bird Island Eudyptes chrysolophus Pygoscelis papua Natural Environment Research Council: NERC Open Research Archive Bird Island ENVELOPE(-38.060,-38.060,-54.004,-54.004) Marine Ecology Progress Series 275 241 249 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Marine Sciences Zoology Ecology and Environment |
spellingShingle |
Marine Sciences Zoology Ecology and Environment Mori, Yoshihisa Boyd, Ian L. Segregation of foraging between two sympatric penguin species: does rate maximisation make the difference? |
topic_facet |
Marine Sciences Zoology Ecology and Environment |
description |
Macaroni Eudyptes chrysolophus and gentoo Pygoscelis papua penguins occur sympatrically at Bird Island (54degrees00'S, 38degrees02'W), South Georgia, and have a similar diet. Macaroni penguins forage at shallower depths and further from the island than gentoo penguins. We tested the hypothesis that differences in the optimal foraging behaviour at the level of individual dives help to explain this ecological foraging segregation. Using a rate maximising diving model, we predicted that macaroni penguins would obtain more energy per dive cycle than gentoo penguins only when they used patches shallower than 30 to 40 m. This prediction was supported by observations of actual dive depths. We conclude that different foraging efficiencies at different depths results in each species being differentially sensitive to the vertical distribution of prey in the water column. We suggest that differing capacities to exploit natural heterogeneity in the distribution of prey has an important role in maintaining these 2 species as sympatric predators of a common resource. |
format |
Article in Journal/Newspaper |
author |
Mori, Yoshihisa Boyd, Ian L. |
author_facet |
Mori, Yoshihisa Boyd, Ian L. |
author_sort |
Mori, Yoshihisa |
title |
Segregation of foraging between two sympatric penguin species: does rate maximisation make the difference? |
title_short |
Segregation of foraging between two sympatric penguin species: does rate maximisation make the difference? |
title_full |
Segregation of foraging between two sympatric penguin species: does rate maximisation make the difference? |
title_fullStr |
Segregation of foraging between two sympatric penguin species: does rate maximisation make the difference? |
title_full_unstemmed |
Segregation of foraging between two sympatric penguin species: does rate maximisation make the difference? |
title_sort |
segregation of foraging between two sympatric penguin species: does rate maximisation make the difference? |
publisher |
Inter-Research |
publishDate |
2004 |
url |
http://nora.nerc.ac.uk/id/eprint/12304/ http://www.int-res.com/articles/meps2004/275/m275p241.pdf |
long_lat |
ENVELOPE(-38.060,-38.060,-54.004,-54.004) |
geographic |
Bird Island |
geographic_facet |
Bird Island |
genre |
Bird Island Eudyptes chrysolophus Pygoscelis papua |
genre_facet |
Bird Island Eudyptes chrysolophus Pygoscelis papua |
op_relation |
Mori, Yoshihisa; Boyd, Ian L. 2004 Segregation of foraging between two sympatric penguin species: does rate maximisation make the difference? Marine Ecology Progress Series, 275. 241-249. https://doi.org/10.3354/meps275241 <https://doi.org/10.3354/meps275241> |
container_title |
Marine Ecology Progress Series |
container_volume |
275 |
container_start_page |
241 |
op_container_end_page |
249 |
_version_ |
1766379071367806976 |