Diet of auklet chicks in the Aleutian Islands, Alaska:Similarity among islands, interspecies overlap, and relationships to ocean climate
Seabirds are effective samplers of the marine environment, and can be used to measure resource partitioning among species and sites via food loads destined for chicks. We examined the composition, overlap, and relationships to changing climate and oceanography of 3,216 food loads from Least, Crested...
Published in: | Journal of Ornithology |
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Language: | English |
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2012
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ftuhipublicatio:oai:pure.atira.dk:publications/4c6b8ad8-112a-491a-9706-cb91497249a1 2024-06-23T07:57:29+00:00 Diet of auklet chicks in the Aleutian Islands, Alaska:Similarity among islands, interspecies overlap, and relationships to ocean climate Bond, Alexander L. Jones, Ian L. Williams, Jeffrey C. Byrd, G. Vernon 2012-01-01 https://pure.uhi.ac.uk/en/publications/4c6b8ad8-112a-491a-9706-cb91497249a1 https://doi.org/10.1007/s10336-011-0704-3 http://www.scopus.com/inward/record.url?scp=84855308102&partnerID=8YFLogxK http://www.scopus.com/inward/citedby.url?scp=84855308102&partnerID=8YFLogxK eng eng https://pure.uhi.ac.uk/en/publications/4c6b8ad8-112a-491a-9706-cb91497249a1 info:eu-repo/semantics/restrictedAccess Bond , A L , Jones , I L , Williams , J C & Byrd , G V 2012 , ' Diet of auklet chicks in the Aleutian Islands, Alaska : Similarity among islands, interspecies overlap, and relationships to ocean climate ' , Journal of Ornithology , vol. 153 , no. 1 , pp. 115-129 . https://doi.org/10.1007/s10336-011-0704-3 Aethia Aleutian Islands Auklet Climate Diet Overlap article 2012 ftuhipublicatio https://doi.org/10.1007/s10336-011-0704-3 2024-05-27T23:56:27Z Seabirds are effective samplers of the marine environment, and can be used to measure resource partitioning among species and sites via food loads destined for chicks. We examined the composition, overlap, and relationships to changing climate and oceanography of 3,216 food loads from Least, Crested, and Whiskered Auklets (Aethia pusilla, A. cristatella, A. pygmaea) breeding in Alaska during 1994-2006. Meals comprised calanoid copepods (Neocalanus spp.) and euphausiids (Thysanoessa spp.) that reflect secondary marine productivity, with no difference among Buldir, Kiska, and Kasatochi islands across 585 km of the Aleutian Islands. Meals were very similar among species (mean Least-Crested Auklet overlap C = 0. 68; Least-Whiskered Auklet overlap C = 0. 96) and among sites, indicating limited partitioning of prey resources for auklets feeding chicks. The biomass of copepods and euphausiids in Least and Crested Auklet food loads was related negatively to the summer (June-July-August) North Pacific Gyre Oscillation, while in Whiskered Auklet food loads, this was negatively related to the winter (December-January-February) Pacific Decadal Oscillation, both of which track basin-wide sea-surface temperature (SST) anomalies. We found a significant quadratic relationship between the biomass of calanoid copepods in Least Auklet food loads at all three study sites and summer (June-July) SST, with maximal copepod biomass between 3-6°C (r 2 = 0. 71). Outside this temperature range, zooplankton becomes less available to auklets through delayed development. Overall, our results suggest that auklets are able to buffer climate-mediated bottom-up forcing of demographic parameters like productivity, as the composition of chick meals has remained constant over the course of our study. Article in Journal/Newspaper Alaska Aleutian Islands Copepods University of the Highlands and Islands: Research Database of UHI Kiska ENVELOPE(155.830,155.830,50.258,50.258) Pacific Journal of Ornithology 153 1 115 129 |
institution |
Open Polar |
collection |
University of the Highlands and Islands: Research Database of UHI |
op_collection_id |
ftuhipublicatio |
language |
English |
topic |
Aethia Aleutian Islands Auklet Climate Diet Overlap |
spellingShingle |
Aethia Aleutian Islands Auklet Climate Diet Overlap Bond, Alexander L. Jones, Ian L. Williams, Jeffrey C. Byrd, G. Vernon Diet of auklet chicks in the Aleutian Islands, Alaska:Similarity among islands, interspecies overlap, and relationships to ocean climate |
topic_facet |
Aethia Aleutian Islands Auklet Climate Diet Overlap |
description |
Seabirds are effective samplers of the marine environment, and can be used to measure resource partitioning among species and sites via food loads destined for chicks. We examined the composition, overlap, and relationships to changing climate and oceanography of 3,216 food loads from Least, Crested, and Whiskered Auklets (Aethia pusilla, A. cristatella, A. pygmaea) breeding in Alaska during 1994-2006. Meals comprised calanoid copepods (Neocalanus spp.) and euphausiids (Thysanoessa spp.) that reflect secondary marine productivity, with no difference among Buldir, Kiska, and Kasatochi islands across 585 km of the Aleutian Islands. Meals were very similar among species (mean Least-Crested Auklet overlap C = 0. 68; Least-Whiskered Auklet overlap C = 0. 96) and among sites, indicating limited partitioning of prey resources for auklets feeding chicks. The biomass of copepods and euphausiids in Least and Crested Auklet food loads was related negatively to the summer (June-July-August) North Pacific Gyre Oscillation, while in Whiskered Auklet food loads, this was negatively related to the winter (December-January-February) Pacific Decadal Oscillation, both of which track basin-wide sea-surface temperature (SST) anomalies. We found a significant quadratic relationship between the biomass of calanoid copepods in Least Auklet food loads at all three study sites and summer (June-July) SST, with maximal copepod biomass between 3-6°C (r 2 = 0. 71). Outside this temperature range, zooplankton becomes less available to auklets through delayed development. Overall, our results suggest that auklets are able to buffer climate-mediated bottom-up forcing of demographic parameters like productivity, as the composition of chick meals has remained constant over the course of our study. |
format |
Article in Journal/Newspaper |
author |
Bond, Alexander L. Jones, Ian L. Williams, Jeffrey C. Byrd, G. Vernon |
author_facet |
Bond, Alexander L. Jones, Ian L. Williams, Jeffrey C. Byrd, G. Vernon |
author_sort |
Bond, Alexander L. |
title |
Diet of auklet chicks in the Aleutian Islands, Alaska:Similarity among islands, interspecies overlap, and relationships to ocean climate |
title_short |
Diet of auklet chicks in the Aleutian Islands, Alaska:Similarity among islands, interspecies overlap, and relationships to ocean climate |
title_full |
Diet of auklet chicks in the Aleutian Islands, Alaska:Similarity among islands, interspecies overlap, and relationships to ocean climate |
title_fullStr |
Diet of auklet chicks in the Aleutian Islands, Alaska:Similarity among islands, interspecies overlap, and relationships to ocean climate |
title_full_unstemmed |
Diet of auklet chicks in the Aleutian Islands, Alaska:Similarity among islands, interspecies overlap, and relationships to ocean climate |
title_sort |
diet of auklet chicks in the aleutian islands, alaska:similarity among islands, interspecies overlap, and relationships to ocean climate |
publishDate |
2012 |
url |
https://pure.uhi.ac.uk/en/publications/4c6b8ad8-112a-491a-9706-cb91497249a1 https://doi.org/10.1007/s10336-011-0704-3 http://www.scopus.com/inward/record.url?scp=84855308102&partnerID=8YFLogxK http://www.scopus.com/inward/citedby.url?scp=84855308102&partnerID=8YFLogxK |
long_lat |
ENVELOPE(155.830,155.830,50.258,50.258) |
geographic |
Kiska Pacific |
geographic_facet |
Kiska Pacific |
genre |
Alaska Aleutian Islands Copepods |
genre_facet |
Alaska Aleutian Islands Copepods |
op_source |
Bond , A L , Jones , I L , Williams , J C & Byrd , G V 2012 , ' Diet of auklet chicks in the Aleutian Islands, Alaska : Similarity among islands, interspecies overlap, and relationships to ocean climate ' , Journal of Ornithology , vol. 153 , no. 1 , pp. 115-129 . https://doi.org/10.1007/s10336-011-0704-3 |
op_relation |
https://pure.uhi.ac.uk/en/publications/4c6b8ad8-112a-491a-9706-cb91497249a1 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1007/s10336-011-0704-3 |
container_title |
Journal of Ornithology |
container_volume |
153 |
container_issue |
1 |
container_start_page |
115 |
op_container_end_page |
129 |
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1802651141610143744 |