A comparative study of breeding ecology and timing in plankton-feeding alcids (Cychlorrhynchus and Aethia spp.) on St. Lawrence Island, Alaska.
A comparative study of breeding ecology in Parakeet Auklets (Cychlorrhynchus psittacula (Pallas)), Crested Auklets (Aethia cristatella (Pallas)), and Least Auklets (A. pusilla (Pallas)) was conducted on St. Lawrence Island, Alaska, in 1966 and 1967. Emphasis was placed upon the climatic conditions w...
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University of British Columbia
1968
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ftunivbritcolcir:oai:circle.library.ubc.ca:2429/35990 2023-05-15T15:18:07+02:00 A comparative study of breeding ecology and timing in plankton-feeding alcids (Cychlorrhynchus and Aethia spp.) on St. Lawrence Island, Alaska. Sealy, Spencer George 1968 http://hdl.handle.net/2429/35990 eng eng University of British Columbia For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use. Alcidae Birds -- Breeding -- Alaska -- Saint Lawrence Island Auks Text Thesis/Dissertation 1968 ftunivbritcolcir 2019-10-15T18:05:02Z A comparative study of breeding ecology in Parakeet Auklets (Cychlorrhynchus psittacula (Pallas)), Crested Auklets (Aethia cristatella (Pallas)), and Least Auklets (A. pusilla (Pallas)) was conducted on St. Lawrence Island, Alaska, in 1966 and 1967. Emphasis was placed upon the climatic conditions which prevailed throughout the breeding seasons and their effects on timing of breeding in auklets. The pre-egg stage, egg-laying and incubation, hatching, growth of young, and departure of chicks were studied in both seasons; 1966 was a late year and 1967 was an early year. It was found that (1) Parakeet Auklets appear to have a more extensive migration than Aethia spp. , (2) arrival of adults back on the breeding grounds in spring occurs at approximately mid-May each year, (3) the pre-egg stage is prolonged but the post-breeding dispersal of adults and young from the nesting slope is rapid, (4) breeding does not take place at the same time each year, (5) Cychlorrhynchus breeds a few days later than Aethia spp., (6) a change in diet accompanies the onset of the chick-rearing period in Aethia spp. but not in Cychlorrhynchus, (7) patterns and rates of growth of A. pusilla chicks and possibly chicks of Cychlorrhynchus and A. cristatella differ according to time of hatching, (8) chicks of these auklets are well-adapted to early life, (9) predation upon auklets is low in the Sevuokuk colony, and (10) molt of adults overlaps the breeding effort in Aethia spp. but not in Cychlorrhynchus. Ecological and behavioral specializations in the annual cycles of these auklets revealed close synchronization and shortening of breeding events necessary for breeding in the short Arctic summer. It appears that these auklets are faced with two problems in timing their breeding cycles. Breeding must take place within a period which is largely dictated by climate and they must make best use of the food supply. Science, Faculty of Zoology, Department of Graduate Thesis Arctic St Lawrence Island Alaska University of British Columbia: cIRcle - UBC's Information Repository Arctic Lawrence Island ENVELOPE(-103.718,-103.718,56.967,56.967) |
institution |
Open Polar |
collection |
University of British Columbia: cIRcle - UBC's Information Repository |
op_collection_id |
ftunivbritcolcir |
language |
English |
topic |
Alcidae Birds -- Breeding -- Alaska -- Saint Lawrence Island Auks |
spellingShingle |
Alcidae Birds -- Breeding -- Alaska -- Saint Lawrence Island Auks Sealy, Spencer George A comparative study of breeding ecology and timing in plankton-feeding alcids (Cychlorrhynchus and Aethia spp.) on St. Lawrence Island, Alaska. |
topic_facet |
Alcidae Birds -- Breeding -- Alaska -- Saint Lawrence Island Auks |
description |
A comparative study of breeding ecology in Parakeet Auklets (Cychlorrhynchus psittacula (Pallas)), Crested Auklets (Aethia cristatella (Pallas)), and Least Auklets (A. pusilla (Pallas)) was conducted on St. Lawrence Island, Alaska, in 1966 and 1967. Emphasis was placed upon the climatic conditions which prevailed throughout the breeding seasons and their effects on timing of breeding in auklets. The pre-egg stage, egg-laying and incubation, hatching, growth of young, and departure of chicks were studied in both seasons; 1966 was a late year and 1967 was an early year. It was found that (1) Parakeet Auklets appear to have a more extensive migration than Aethia spp. , (2) arrival of adults back on the breeding grounds in spring occurs at approximately mid-May each year, (3) the pre-egg stage is prolonged but the post-breeding dispersal of adults and young from the nesting slope is rapid, (4) breeding does not take place at the same time each year, (5) Cychlorrhynchus breeds a few days later than Aethia spp., (6) a change in diet accompanies the onset of the chick-rearing period in Aethia spp. but not in Cychlorrhynchus, (7) patterns and rates of growth of A. pusilla chicks and possibly chicks of Cychlorrhynchus and A. cristatella differ according to time of hatching, (8) chicks of these auklets are well-adapted to early life, (9) predation upon auklets is low in the Sevuokuk colony, and (10) molt of adults overlaps the breeding effort in Aethia spp. but not in Cychlorrhynchus. Ecological and behavioral specializations in the annual cycles of these auklets revealed close synchronization and shortening of breeding events necessary for breeding in the short Arctic summer. It appears that these auklets are faced with two problems in timing their breeding cycles. Breeding must take place within a period which is largely dictated by climate and they must make best use of the food supply. Science, Faculty of Zoology, Department of Graduate |
format |
Thesis |
author |
Sealy, Spencer George |
author_facet |
Sealy, Spencer George |
author_sort |
Sealy, Spencer George |
title |
A comparative study of breeding ecology and timing in plankton-feeding alcids (Cychlorrhynchus and Aethia spp.) on St. Lawrence Island, Alaska. |
title_short |
A comparative study of breeding ecology and timing in plankton-feeding alcids (Cychlorrhynchus and Aethia spp.) on St. Lawrence Island, Alaska. |
title_full |
A comparative study of breeding ecology and timing in plankton-feeding alcids (Cychlorrhynchus and Aethia spp.) on St. Lawrence Island, Alaska. |
title_fullStr |
A comparative study of breeding ecology and timing in plankton-feeding alcids (Cychlorrhynchus and Aethia spp.) on St. Lawrence Island, Alaska. |
title_full_unstemmed |
A comparative study of breeding ecology and timing in plankton-feeding alcids (Cychlorrhynchus and Aethia spp.) on St. Lawrence Island, Alaska. |
title_sort |
comparative study of breeding ecology and timing in plankton-feeding alcids (cychlorrhynchus and aethia spp.) on st. lawrence island, alaska. |
publisher |
University of British Columbia |
publishDate |
1968 |
url |
http://hdl.handle.net/2429/35990 |
long_lat |
ENVELOPE(-103.718,-103.718,56.967,56.967) |
geographic |
Arctic Lawrence Island |
geographic_facet |
Arctic Lawrence Island |
genre |
Arctic St Lawrence Island Alaska |
genre_facet |
Arctic St Lawrence Island Alaska |
op_rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use. |
_version_ |
1766348350204936192 |