Allometry, bilateral asymmetry and sexual differences in the vocal tract of common eiders Somateria mollissima and king eiders S. spectabilis
Intraspecific sexual differences, high variation, and positive allometry of sexually‐selected external display structures are common. Many sexually‐selected anatomical specializations occur in the avian vocal tract but intraspecific variation and allometry have been investigated little. The tracheal...
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crwiley:10.1111/j.2007.0908-8857.03695.x 2023-12-03T10:30:18+01:00 Allometry, bilateral asymmetry and sexual differences in the vocal tract of common eiders Somateria mollissima and king eiders S. spectabilis Miller, Edward H. Williams, Joni Jamieson, Sarah E. Grant Gilchrist, H. Mallory, Mark L. 2007 http://dx.doi.org/10.1111/j.2007.0908-8857.03695.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.2007.0908-8857.03695.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.2007.0908-8857.03695.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Avian Biology volume 38, issue 2, page 224-233 ISSN 0908-8857 1600-048X Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 2007 crwiley https://doi.org/10.1111/j.2007.0908-8857.03695.x 2023-11-09T13:38:23Z Intraspecific sexual differences, high variation, and positive allometry of sexually‐selected external display structures are common. Many sexually‐selected anatomical specializations occur in the avian vocal tract but intraspecific variation and allometry have been investigated little. The tracheal bulla bulla syringealis occurs in males of most duck species. We quantified variation and size‐scaling of the bulla, plus sexual differences in size of trachea, bronchi, and vocal muscles, for 62 common eiders Somateria mollissima and 51 king eiders S. spectabilis. Trends were similar in both species. Bullar ossification and definitive size occurred early in life: bullar size did not differ between first‐year and older males. Bullar size did not vary more than size of other body parts (CVs of 3.4–7.0% for bullar length and breadth). Bullar size scaled to body size with negative allometry or isometry. Vocal muscles were 10–50% thicker in males than females, a much greater sexual difference than in body size (CVs of 3–6% on linear body‐size variables). Vocal muscles were larger on the left side in both sexes and bilateral asymmetry was slightly more pronounced in males. Low variation and a trend towards negative allometry suggest that bullar size is under stabilizing selection; if bullar size affects vocal attributes of voice, then the latter cannot be condition‐dependent. We recommend comparative research on vocal communication, vocal individuality and vocal‐tract anatomy and function in eiders and other ducks. Article in Journal/Newspaper Somateria mollissima Wiley Online Library (via Crossref) Journal of Avian Biology 38 2 224 233 |
institution |
Open Polar |
collection |
Wiley Online Library (via Crossref) |
op_collection_id |
crwiley |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Miller, Edward H. Williams, Joni Jamieson, Sarah E. Grant Gilchrist, H. Mallory, Mark L. Allometry, bilateral asymmetry and sexual differences in the vocal tract of common eiders Somateria mollissima and king eiders S. spectabilis |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
Intraspecific sexual differences, high variation, and positive allometry of sexually‐selected external display structures are common. Many sexually‐selected anatomical specializations occur in the avian vocal tract but intraspecific variation and allometry have been investigated little. The tracheal bulla bulla syringealis occurs in males of most duck species. We quantified variation and size‐scaling of the bulla, plus sexual differences in size of trachea, bronchi, and vocal muscles, for 62 common eiders Somateria mollissima and 51 king eiders S. spectabilis. Trends were similar in both species. Bullar ossification and definitive size occurred early in life: bullar size did not differ between first‐year and older males. Bullar size did not vary more than size of other body parts (CVs of 3.4–7.0% for bullar length and breadth). Bullar size scaled to body size with negative allometry or isometry. Vocal muscles were 10–50% thicker in males than females, a much greater sexual difference than in body size (CVs of 3–6% on linear body‐size variables). Vocal muscles were larger on the left side in both sexes and bilateral asymmetry was slightly more pronounced in males. Low variation and a trend towards negative allometry suggest that bullar size is under stabilizing selection; if bullar size affects vocal attributes of voice, then the latter cannot be condition‐dependent. We recommend comparative research on vocal communication, vocal individuality and vocal‐tract anatomy and function in eiders and other ducks. |
format |
Article in Journal/Newspaper |
author |
Miller, Edward H. Williams, Joni Jamieson, Sarah E. Grant Gilchrist, H. Mallory, Mark L. |
author_facet |
Miller, Edward H. Williams, Joni Jamieson, Sarah E. Grant Gilchrist, H. Mallory, Mark L. |
author_sort |
Miller, Edward H. |
title |
Allometry, bilateral asymmetry and sexual differences in the vocal tract of common eiders Somateria mollissima and king eiders S. spectabilis |
title_short |
Allometry, bilateral asymmetry and sexual differences in the vocal tract of common eiders Somateria mollissima and king eiders S. spectabilis |
title_full |
Allometry, bilateral asymmetry and sexual differences in the vocal tract of common eiders Somateria mollissima and king eiders S. spectabilis |
title_fullStr |
Allometry, bilateral asymmetry and sexual differences in the vocal tract of common eiders Somateria mollissima and king eiders S. spectabilis |
title_full_unstemmed |
Allometry, bilateral asymmetry and sexual differences in the vocal tract of common eiders Somateria mollissima and king eiders S. spectabilis |
title_sort |
allometry, bilateral asymmetry and sexual differences in the vocal tract of common eiders somateria mollissima and king eiders s. spectabilis |
publisher |
Wiley |
publishDate |
2007 |
url |
http://dx.doi.org/10.1111/j.2007.0908-8857.03695.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.2007.0908-8857.03695.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.2007.0908-8857.03695.x |
genre |
Somateria mollissima |
genre_facet |
Somateria mollissima |
op_source |
Journal of Avian Biology volume 38, issue 2, page 224-233 ISSN 0908-8857 1600-048X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.2007.0908-8857.03695.x |
container_title |
Journal of Avian Biology |
container_volume |
38 |
container_issue |
2 |
container_start_page |
224 |
op_container_end_page |
233 |
_version_ |
1784256064538017792 |