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...
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/d651d6ec-1911-480c-9158-f4a99d6bb679 2024-06-23T07:47:57+00:00 Segregation of foraging between two sympatric penguin species: does rate maximisation make the difference? Mori, Y Boyd, I L 2004 https://research-portal.st-andrews.ac.uk/en/researchoutput/segregation-of-foraging-between-two-sympatric-penguin-species-does-rate-maximisation-make-the-difference(d651d6ec-1911-480c-9158-f4a99d6bb679).html http://www.scopus.com/inward/record.url?scp=4043052880&partnerID=8YFLogxK eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/segregation-of-foraging-between-two-sympatric-penguin-species-does-rate-maximisation-make-the-difference(d651d6ec-1911-480c-9158-f4a99d6bb679).html info:eu-repo/semantics/restrictedAccess Mori , Y & Boyd , I L 2004 , ' Segregation of foraging between two sympatric penguin species: does rate maximisation make the difference? ' , Marine Ecology Progress Series , vol. 275 , pp. 241-249 . optimal foraging segregation of foraging area macaroni penguins gentoo penguins ANTARCTIC FUR SEALS SOUTH GEORGIA PYGOSCELIS-PAPUA DIVING BEHAVIOR EUDYPTES-CHRYSOLOPHUS COMMUNITY STRUCTURE CHINSTRAP PENGUINS PREY CONSUMPTION FEEDING ECOLOGY COEXISTENCE article 2004 ftunstandrewcris 2024-06-13T00:25:25Z 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 Antarc* Antarctic Antarctic Fur Seals Bird Island Eudyptes chrysolophus Pygoscelis papua University of St Andrews: Research Portal Antarctic Bird Island ENVELOPE(-38.060,-38.060,-54.004,-54.004) |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
optimal foraging segregation of foraging area macaroni penguins gentoo penguins ANTARCTIC FUR SEALS SOUTH GEORGIA PYGOSCELIS-PAPUA DIVING BEHAVIOR EUDYPTES-CHRYSOLOPHUS COMMUNITY STRUCTURE CHINSTRAP PENGUINS PREY CONSUMPTION FEEDING ECOLOGY COEXISTENCE |
spellingShingle |
optimal foraging segregation of foraging area macaroni penguins gentoo penguins ANTARCTIC FUR SEALS SOUTH GEORGIA PYGOSCELIS-PAPUA DIVING BEHAVIOR EUDYPTES-CHRYSOLOPHUS COMMUNITY STRUCTURE CHINSTRAP PENGUINS PREY CONSUMPTION FEEDING ECOLOGY COEXISTENCE Mori, Y Boyd, I L Segregation of foraging between two sympatric penguin species: does rate maximisation make the difference? |
topic_facet |
optimal foraging segregation of foraging area macaroni penguins gentoo penguins ANTARCTIC FUR SEALS SOUTH GEORGIA PYGOSCELIS-PAPUA DIVING BEHAVIOR EUDYPTES-CHRYSOLOPHUS COMMUNITY STRUCTURE CHINSTRAP PENGUINS PREY CONSUMPTION FEEDING ECOLOGY COEXISTENCE |
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, Y Boyd, I L |
author_facet |
Mori, Y Boyd, I L |
author_sort |
Mori, Y |
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? |
publishDate |
2004 |
url |
https://research-portal.st-andrews.ac.uk/en/researchoutput/segregation-of-foraging-between-two-sympatric-penguin-species-does-rate-maximisation-make-the-difference(d651d6ec-1911-480c-9158-f4a99d6bb679).html http://www.scopus.com/inward/record.url?scp=4043052880&partnerID=8YFLogxK |
long_lat |
ENVELOPE(-38.060,-38.060,-54.004,-54.004) |
geographic |
Antarctic Bird Island |
geographic_facet |
Antarctic Bird Island |
genre |
Antarc* Antarctic Antarctic Fur Seals Bird Island Eudyptes chrysolophus Pygoscelis papua |
genre_facet |
Antarc* Antarctic Antarctic Fur Seals Bird Island Eudyptes chrysolophus Pygoscelis papua |
op_source |
Mori , Y & Boyd , I L 2004 , ' Segregation of foraging between two sympatric penguin species: does rate maximisation make the difference? ' , Marine Ecology Progress Series , vol. 275 , pp. 241-249 . |
op_relation |
https://research-portal.st-andrews.ac.uk/en/researchoutput/segregation-of-foraging-between-two-sympatric-penguin-species-does-rate-maximisation-make-the-difference(d651d6ec-1911-480c-9158-f4a99d6bb679).html |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1802638258381783040 |