Feeding of the least, crested, and parakeet auklets around St. Lawrence Island, Alaska
The feeding habits of three plankton-feeding Alcidae, the least, crested, and parakeet auklets were studied on St. Lawrence Island, Alaska, between 1964 and 1966. The crested and the least auklets (Aethia cristatella, A. pusilla) exhibit similar patterns of dependence upon the food resources: both h...
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Language: | English |
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Canadian Science Publishing
1969
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Online Access: | http://dx.doi.org/10.1139/z69-166 http://www.nrcresearchpress.com/doi/pdf/10.1139/z69-166 |
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crcansciencepubl:10.1139/z69-166 2023-12-17T10:50:42+01:00 Feeding of the least, crested, and parakeet auklets around St. Lawrence Island, Alaska Bédard, Jean 1969 http://dx.doi.org/10.1139/z69-166 http://www.nrcresearchpress.com/doi/pdf/10.1139/z69-166 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 47, issue 5, page 1025-1050 ISSN 0008-4301 1480-3283 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 1969 crcansciencepubl https://doi.org/10.1139/z69-166 2023-11-19T13:39:05Z The feeding habits of three plankton-feeding Alcidae, the least, crested, and parakeet auklets were studied on St. Lawrence Island, Alaska, between 1964 and 1966. The crested and the least auklets (Aethia cristatella, A. pusilla) exhibit similar patterns of dependence upon the food resources: both have, during early summer, a diversified diet consisting of mysids, hyperiids, gammarids, etc., but restrict themselves largely to one principal prey during the chick-rearing period. Then, A. pusilla eats mostly Calanus sp. while A. cristatella eats Thysanoessa spp. In all years, hatching coincided closely with the appearance of these prey items (copepods and euphausids) in the environment and it is argued that the timing of the auklets' breeding season has been adjusted to their cyclical abundance. Cyclorrhynchus psittacula, the parakeet auklet, maintains a diversified diet throughout the summer: Parathemisto libellula, a pelagic amphipod, is the dominant prey in its diet.The three species are found feeding together and are presumed to use the same depth range. Segregation in feeding between A. cristatella and A. pusilla is achieved by difference in bill size. This difference is sufficient to impose obligatory feeding upon different resources. Segregation between two possible competitors, A. cristatella and Cyclorrhynchus, seems to rest upon innate preferences for different prey types, minor structural differences in the feeding apparatus, and differences in foraging habits: the relative importance of each of these factors remains to be established.As a whole, the amount of overlap in feeding between the three species studied is very small. Article in Journal/Newspaper St Lawrence Island Alaska Copepods Canadian Science Publishing (via Crossref) Lawrence Island ENVELOPE(-103.718,-103.718,56.967,56.967) Canadian Journal of Zoology 47 5 1025 1050 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Bédard, Jean Feeding of the least, crested, and parakeet auklets around St. Lawrence Island, Alaska |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
The feeding habits of three plankton-feeding Alcidae, the least, crested, and parakeet auklets were studied on St. Lawrence Island, Alaska, between 1964 and 1966. The crested and the least auklets (Aethia cristatella, A. pusilla) exhibit similar patterns of dependence upon the food resources: both have, during early summer, a diversified diet consisting of mysids, hyperiids, gammarids, etc., but restrict themselves largely to one principal prey during the chick-rearing period. Then, A. pusilla eats mostly Calanus sp. while A. cristatella eats Thysanoessa spp. In all years, hatching coincided closely with the appearance of these prey items (copepods and euphausids) in the environment and it is argued that the timing of the auklets' breeding season has been adjusted to their cyclical abundance. Cyclorrhynchus psittacula, the parakeet auklet, maintains a diversified diet throughout the summer: Parathemisto libellula, a pelagic amphipod, is the dominant prey in its diet.The three species are found feeding together and are presumed to use the same depth range. Segregation in feeding between A. cristatella and A. pusilla is achieved by difference in bill size. This difference is sufficient to impose obligatory feeding upon different resources. Segregation between two possible competitors, A. cristatella and Cyclorrhynchus, seems to rest upon innate preferences for different prey types, minor structural differences in the feeding apparatus, and differences in foraging habits: the relative importance of each of these factors remains to be established.As a whole, the amount of overlap in feeding between the three species studied is very small. |
format |
Article in Journal/Newspaper |
author |
Bédard, Jean |
author_facet |
Bédard, Jean |
author_sort |
Bédard, Jean |
title |
Feeding of the least, crested, and parakeet auklets around St. Lawrence Island, Alaska |
title_short |
Feeding of the least, crested, and parakeet auklets around St. Lawrence Island, Alaska |
title_full |
Feeding of the least, crested, and parakeet auklets around St. Lawrence Island, Alaska |
title_fullStr |
Feeding of the least, crested, and parakeet auklets around St. Lawrence Island, Alaska |
title_full_unstemmed |
Feeding of the least, crested, and parakeet auklets around St. Lawrence Island, Alaska |
title_sort |
feeding of the least, crested, and parakeet auklets around st. lawrence island, alaska |
publisher |
Canadian Science Publishing |
publishDate |
1969 |
url |
http://dx.doi.org/10.1139/z69-166 http://www.nrcresearchpress.com/doi/pdf/10.1139/z69-166 |
long_lat |
ENVELOPE(-103.718,-103.718,56.967,56.967) |
geographic |
Lawrence Island |
geographic_facet |
Lawrence Island |
genre |
St Lawrence Island Alaska Copepods |
genre_facet |
St Lawrence Island Alaska Copepods |
op_source |
Canadian Journal of Zoology volume 47, issue 5, page 1025-1050 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z69-166 |
container_title |
Canadian Journal of Zoology |
container_volume |
47 |
container_issue |
5 |
container_start_page |
1025 |
op_container_end_page |
1050 |
_version_ |
1785575741865328640 |