Extensive variation in feather ornaments of Whiskered Auklets in the Aleutian Islands reflects age, sex, condition, and geography
Both sexes of Whiskered Auklets (Aethia pygmaea) display the most elaborate feather ornaments of any seabird: a slender black forehead crest, and 3 bilaterally symmetrical pairs of white facial plumes (superorbital, suborbital, and auricular). We studied patterns of ornament variation in 796 banded...
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American Ornithological Society
2022
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ftbioone:10.1093/ornithology/ukab082 2024-06-02T08:15:57+00:00 Extensive variation in feather ornaments of Whiskered Auklets in the Aleutian Islands reflects age, sex, condition, and geography Ian L. Jones Fiona M. Hunter Sampath S. Seneviratne Jeffrey C. Williams Robert Montgomerie Ian L. Jones Fiona M. Hunter Sampath S. Seneviratne Jeffrey C. Williams Robert Montgomerie world 2022-01-04 text/HTML https://doi.org/10.1093/ornithology/ukab082 en eng American Ornithological Society doi:10.1093/ornithology/ukab082 All rights reserved. https://doi.org/10.1093/ornithology/ukab082 Aleutian Aleutianas ave marina feather ornaments ornamentos de plumas selección social Text 2022 ftbioone https://doi.org/10.1093/ornithology/ukab082 2024-05-07T00:56:38Z Both sexes of Whiskered Auklets (Aethia pygmaea) display the most elaborate feather ornaments of any seabird: a slender black forehead crest, and 3 bilaterally symmetrical pairs of white facial plumes (superorbital, suborbital, and auricular). We studied patterns of ornament variation in 796 banded individuals (147 of known sex, 254 of known age from 1 to 16 years) during 1992–2009 at Buldir Island (principally), and 3 other Aleutian Islands (Davidof, Ulak, and Egg) in Alaska, USA. As expected for socially selected traits, ornaments were more variable across individuals than anatomical traits in size but with only slightly male-biased sexual dimorphism. Body condition index increased from age 1 to 3 years but changed little thereafter. Even within birds ≥4 years old, ornament size was positively related to body condition index. Subadults (one-year-olds) had smaller ornaments than adults (age 2–16 years) but there was no further change in ornament size as adults aged and no evidence of senescence even in the oldest birds (>8 years old). Nonetheless, overall ornament size varied from year-to-year at Buldir and was correlated with indices of both ocean climate and auklet productivity in the preceding 2–5 years. From Buldir to Egg Island (1,266 km), the size of both anatomical and ornamental traits increased by 5–15% except for bill depth, which was largest in birds from Buldir and Egg at opposite ends of the Aleutian breeding range. This study is one of few to examine patterns of ornament variation in a long-lived, socially monogamous bird, even though such patterns are crucial to understanding the relationship between sexual selection and life history. LAY SUMMARY Whiskered Auklets, a small seabird, were measured over an 18-year period (1992–2009) in the Aleutian Islands, Alaska, to examine relationships between the size of their facial feather ornaments and their sex, age, body condition, annual productivity, and geographical distribution, as well as ocean climate. Males were slightly larger than females in ... Text Alaska Aleutian Islands Egg Island BioOne Online Journals Buldir Island ENVELOPE(175.925,175.925,52.358,52.358) Egg Island ENVELOPE(-57.708,-57.708,-63.674,-63.674) Ornithology 139 2 |
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Open Polar |
collection |
BioOne Online Journals |
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ftbioone |
language |
English |
topic |
Aleutian Aleutianas ave marina feather ornaments ornamentos de plumas selección social |
spellingShingle |
Aleutian Aleutianas ave marina feather ornaments ornamentos de plumas selección social Ian L. Jones Fiona M. Hunter Sampath S. Seneviratne Jeffrey C. Williams Robert Montgomerie Extensive variation in feather ornaments of Whiskered Auklets in the Aleutian Islands reflects age, sex, condition, and geography |
topic_facet |
Aleutian Aleutianas ave marina feather ornaments ornamentos de plumas selección social |
description |
Both sexes of Whiskered Auklets (Aethia pygmaea) display the most elaborate feather ornaments of any seabird: a slender black forehead crest, and 3 bilaterally symmetrical pairs of white facial plumes (superorbital, suborbital, and auricular). We studied patterns of ornament variation in 796 banded individuals (147 of known sex, 254 of known age from 1 to 16 years) during 1992–2009 at Buldir Island (principally), and 3 other Aleutian Islands (Davidof, Ulak, and Egg) in Alaska, USA. As expected for socially selected traits, ornaments were more variable across individuals than anatomical traits in size but with only slightly male-biased sexual dimorphism. Body condition index increased from age 1 to 3 years but changed little thereafter. Even within birds ≥4 years old, ornament size was positively related to body condition index. Subadults (one-year-olds) had smaller ornaments than adults (age 2–16 years) but there was no further change in ornament size as adults aged and no evidence of senescence even in the oldest birds (>8 years old). Nonetheless, overall ornament size varied from year-to-year at Buldir and was correlated with indices of both ocean climate and auklet productivity in the preceding 2–5 years. From Buldir to Egg Island (1,266 km), the size of both anatomical and ornamental traits increased by 5–15% except for bill depth, which was largest in birds from Buldir and Egg at opposite ends of the Aleutian breeding range. This study is one of few to examine patterns of ornament variation in a long-lived, socially monogamous bird, even though such patterns are crucial to understanding the relationship between sexual selection and life history. LAY SUMMARY Whiskered Auklets, a small seabird, were measured over an 18-year period (1992–2009) in the Aleutian Islands, Alaska, to examine relationships between the size of their facial feather ornaments and their sex, age, body condition, annual productivity, and geographical distribution, as well as ocean climate. Males were slightly larger than females in ... |
author2 |
Ian L. Jones Fiona M. Hunter Sampath S. Seneviratne Jeffrey C. Williams Robert Montgomerie |
format |
Text |
author |
Ian L. Jones Fiona M. Hunter Sampath S. Seneviratne Jeffrey C. Williams Robert Montgomerie |
author_facet |
Ian L. Jones Fiona M. Hunter Sampath S. Seneviratne Jeffrey C. Williams Robert Montgomerie |
author_sort |
Ian L. Jones |
title |
Extensive variation in feather ornaments of Whiskered Auklets in the Aleutian Islands reflects age, sex, condition, and geography |
title_short |
Extensive variation in feather ornaments of Whiskered Auklets in the Aleutian Islands reflects age, sex, condition, and geography |
title_full |
Extensive variation in feather ornaments of Whiskered Auklets in the Aleutian Islands reflects age, sex, condition, and geography |
title_fullStr |
Extensive variation in feather ornaments of Whiskered Auklets in the Aleutian Islands reflects age, sex, condition, and geography |
title_full_unstemmed |
Extensive variation in feather ornaments of Whiskered Auklets in the Aleutian Islands reflects age, sex, condition, and geography |
title_sort |
extensive variation in feather ornaments of whiskered auklets in the aleutian islands reflects age, sex, condition, and geography |
publisher |
American Ornithological Society |
publishDate |
2022 |
url |
https://doi.org/10.1093/ornithology/ukab082 |
op_coverage |
world |
long_lat |
ENVELOPE(175.925,175.925,52.358,52.358) ENVELOPE(-57.708,-57.708,-63.674,-63.674) |
geographic |
Buldir Island Egg Island |
geographic_facet |
Buldir Island Egg Island |
genre |
Alaska Aleutian Islands Egg Island |
genre_facet |
Alaska Aleutian Islands Egg Island |
op_source |
https://doi.org/10.1093/ornithology/ukab082 |
op_relation |
doi:10.1093/ornithology/ukab082 |
op_rights |
All rights reserved. |
op_doi |
https://doi.org/10.1093/ornithology/ukab082 |
container_title |
Ornithology |
container_volume |
139 |
container_issue |
2 |
_version_ |
1800740265813606400 |