Covariation among demographic and climate parameters in whiskered auklets Aethia pygmaea
Annual survival rate and other demographic parameters of whiskered auklets Aethia pygmaea , a small planktivorous seabird, were measured at Buldir Island Alaska during 1992–2003 to provide comparative information for auk life history studies and to test for links among climate, age, productivity and...
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Online Access: | http://dx.doi.org/10.1111/j.0908-8857.2007.03895.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.0908-8857.2007.03895.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.0908-8857.2007.03895.x |
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crwiley:10.1111/j.0908-8857.2007.03895.x 2024-06-02T07:54:46+00:00 Covariation among demographic and climate parameters in whiskered auklets Aethia pygmaea Jones, Ian L. Hunter, Fiona M. Robertson, Gregory J. Williams, Jeffrey C. Vernon Byrd, G. 2007 http://dx.doi.org/10.1111/j.0908-8857.2007.03895.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.0908-8857.2007.03895.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.0908-8857.2007.03895.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Avian Biology volume 38, issue 4, page 450-461 ISSN 0908-8857 1600-048X journal-article 2007 crwiley https://doi.org/10.1111/j.0908-8857.2007.03895.x 2024-05-03T10:58:16Z Annual survival rate and other demographic parameters of whiskered auklets Aethia pygmaea , a small planktivorous seabird, were measured at Buldir Island Alaska during 1992–2003 to provide comparative information for auk life history studies and to test for links among climate, age, productivity and survival. Using two 9 m mistnets, we captured and recaptured 384 adult and 193 sub‐adult (one year old, a known‐age component of our sample) birds as they arrived at the colony after dark during May and June (1,730 capture events). The best fitting model indicated a lower initial survival rate over the first year following marking (0.708±0.036 SE), and subsequent survival (mean 0.835±0.029) covarying with the Aleutian Low Pressure climate Index, with higher auklet survival in years with weak low pressure over the Aleutian Islands. Annual survival rate varied from 0.726±0.127 in 1998–99 to 0.994±0.077 in 1994–95, rates similar to those previously reported for least A. pusilla and crested auklets A. cristatella . A model based only on recaptures of known‐age birds indicated a lower local survival estimate over the first year following marking (age one to two years), with no other age‐effects on survival. Breeding propensity by age inferred from recaptures of birds with fully‐developed brood patches that were originally marked as sub‐adults (one year olds) indicated 53% breeding at age two, 94% breeding at age 3, 97% breeding at age 4 and 100% breeding thereafter. The sex ratio of the sampled birds was significantly male biased (60/40), likely due to differences in behaviour between males and females during the incubation stage. Taken together, our data indicate that whiskered auklet survival and productivity covaried with continuous variation in large‐scale climatic conditions, the mechanism being either negative effects of stormy North Pacific weather or indirect effects on food supplies. Article in Journal/Newspaper aleutian low Alaska Aleutian Islands Wiley Online Library Buldir Island ENVELOPE(175.925,175.925,52.358,52.358) Pacific Journal of Avian Biology 38 4 450 461 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Annual survival rate and other demographic parameters of whiskered auklets Aethia pygmaea , a small planktivorous seabird, were measured at Buldir Island Alaska during 1992–2003 to provide comparative information for auk life history studies and to test for links among climate, age, productivity and survival. Using two 9 m mistnets, we captured and recaptured 384 adult and 193 sub‐adult (one year old, a known‐age component of our sample) birds as they arrived at the colony after dark during May and June (1,730 capture events). The best fitting model indicated a lower initial survival rate over the first year following marking (0.708±0.036 SE), and subsequent survival (mean 0.835±0.029) covarying with the Aleutian Low Pressure climate Index, with higher auklet survival in years with weak low pressure over the Aleutian Islands. Annual survival rate varied from 0.726±0.127 in 1998–99 to 0.994±0.077 in 1994–95, rates similar to those previously reported for least A. pusilla and crested auklets A. cristatella . A model based only on recaptures of known‐age birds indicated a lower local survival estimate over the first year following marking (age one to two years), with no other age‐effects on survival. Breeding propensity by age inferred from recaptures of birds with fully‐developed brood patches that were originally marked as sub‐adults (one year olds) indicated 53% breeding at age two, 94% breeding at age 3, 97% breeding at age 4 and 100% breeding thereafter. The sex ratio of the sampled birds was significantly male biased (60/40), likely due to differences in behaviour between males and females during the incubation stage. Taken together, our data indicate that whiskered auklet survival and productivity covaried with continuous variation in large‐scale climatic conditions, the mechanism being either negative effects of stormy North Pacific weather or indirect effects on food supplies. |
format |
Article in Journal/Newspaper |
author |
Jones, Ian L. Hunter, Fiona M. Robertson, Gregory J. Williams, Jeffrey C. Vernon Byrd, G. |
spellingShingle |
Jones, Ian L. Hunter, Fiona M. Robertson, Gregory J. Williams, Jeffrey C. Vernon Byrd, G. Covariation among demographic and climate parameters in whiskered auklets Aethia pygmaea |
author_facet |
Jones, Ian L. Hunter, Fiona M. Robertson, Gregory J. Williams, Jeffrey C. Vernon Byrd, G. |
author_sort |
Jones, Ian L. |
title |
Covariation among demographic and climate parameters in whiskered auklets Aethia pygmaea |
title_short |
Covariation among demographic and climate parameters in whiskered auklets Aethia pygmaea |
title_full |
Covariation among demographic and climate parameters in whiskered auklets Aethia pygmaea |
title_fullStr |
Covariation among demographic and climate parameters in whiskered auklets Aethia pygmaea |
title_full_unstemmed |
Covariation among demographic and climate parameters in whiskered auklets Aethia pygmaea |
title_sort |
covariation among demographic and climate parameters in whiskered auklets aethia pygmaea |
publisher |
Wiley |
publishDate |
2007 |
url |
http://dx.doi.org/10.1111/j.0908-8857.2007.03895.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.0908-8857.2007.03895.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.0908-8857.2007.03895.x |
long_lat |
ENVELOPE(175.925,175.925,52.358,52.358) |
geographic |
Buldir Island Pacific |
geographic_facet |
Buldir Island Pacific |
genre |
aleutian low Alaska Aleutian Islands |
genre_facet |
aleutian low Alaska Aleutian Islands |
op_source |
Journal of Avian Biology volume 38, issue 4, page 450-461 ISSN 0908-8857 1600-048X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.0908-8857.2007.03895.x |
container_title |
Journal of Avian Biology |
container_volume |
38 |
container_issue |
4 |
container_start_page |
450 |
op_container_end_page |
461 |
_version_ |
1800743429059117056 |