Lesser Scaup population dynamics: what can belearned from available data?
Populations of Lesser Scaup (Aythya affinis) have declined markedly in North America since the early 1980s. When considering alternatives for achieving population recovery, it would be useful to understand how the rate of population growth is functionally related to the underlying vital rates and wh...
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ftutahsudc:oai:digitalcommons.usu.edu:wild_facpub-1276 2023-05-15T15:34:48+02:00 Lesser Scaup population dynamics: what can belearned from available data? Koons, David N. Rotella, J. J. Willey, D. W. Taper, M. Clark, R. G. Slattery, S. Brook, R. W. Corcoran, R. M. Lovvorn, J. R. 2006-01-01T08:00:00Z https://digitalcommons.usu.edu/wild_facpub/277 unknown Hosted by Utah State University Libraries https://digitalcommons.usu.edu/wild_facpub/277 Copyright for this work is held by the author. Transmission or reproduction of materials protected by copyright beyond that allowed by fair use requires the written permission of the copyright owners. Works not in the public domain cannot be commercially exploited without permission of the copyright owner. Responsibility for any use rests exclusively with the user. For more information contact the Institutional Repository Librarian at digitalcommons@usu.edu. PDM Wildland Resources Faculty Publications scaup population text 2006 ftutahsudc 2022-10-27T17:22:56Z Populations of Lesser Scaup (Aythya affinis) have declined markedly in North America since the early 1980s. When considering alternatives for achieving population recovery, it would be useful to understand how the rate of population growth is functionally related to the underlying vital rates and which vital rates affect population growth rate the most if changed (which need not be those that influenced historical population declines). To establish a more quantitative basis for learning about life history and population dynamics of Lesser Scaup, we summarized published and unpublished estimates of vital rates recorded between 1934 and 2005, and developed matrix life-cycle models with these data for females breeding in the boreal forest, prairie-parklands, and both regions combined. We then used perturbation analysis to evaluate the effect of changes in a variety of vital-rate statistics on finite population growth rate and abundance. Similar to Greater Scaup (Aythya marila), our modeled population growth rate for Lesser Scaup was most sensitive to unit and proportional change in adult female survival during the breeding and non-breeding seasons, but much less so to changes in fecundity parameters. Interestingly, population growth rate was also highly sensitive to unit and proportional changes in the mean of nesting success, duckling survival, and juvenile survival. Given the small samples of data for key aspects of the Lesser Scaup life cycle, we recommend additional research on vital rates that demonstrate a strong effect on population growth and size (e.g., adult survival probabilities). Our life-cycle models should be tested and regularly updated in the future to simultaneously guide science and management of Lesser Scaup populations in an adaptive context. Text Aythya marila greater scaup Utah State University: DigitalCommons@USU |
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Utah State University: DigitalCommons@USU |
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scaup population |
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scaup population Koons, David N. Rotella, J. J. Willey, D. W. Taper, M. Clark, R. G. Slattery, S. Brook, R. W. Corcoran, R. M. Lovvorn, J. R. Lesser Scaup population dynamics: what can belearned from available data? |
topic_facet |
scaup population |
description |
Populations of Lesser Scaup (Aythya affinis) have declined markedly in North America since the early 1980s. When considering alternatives for achieving population recovery, it would be useful to understand how the rate of population growth is functionally related to the underlying vital rates and which vital rates affect population growth rate the most if changed (which need not be those that influenced historical population declines). To establish a more quantitative basis for learning about life history and population dynamics of Lesser Scaup, we summarized published and unpublished estimates of vital rates recorded between 1934 and 2005, and developed matrix life-cycle models with these data for females breeding in the boreal forest, prairie-parklands, and both regions combined. We then used perturbation analysis to evaluate the effect of changes in a variety of vital-rate statistics on finite population growth rate and abundance. Similar to Greater Scaup (Aythya marila), our modeled population growth rate for Lesser Scaup was most sensitive to unit and proportional change in adult female survival during the breeding and non-breeding seasons, but much less so to changes in fecundity parameters. Interestingly, population growth rate was also highly sensitive to unit and proportional changes in the mean of nesting success, duckling survival, and juvenile survival. Given the small samples of data for key aspects of the Lesser Scaup life cycle, we recommend additional research on vital rates that demonstrate a strong effect on population growth and size (e.g., adult survival probabilities). Our life-cycle models should be tested and regularly updated in the future to simultaneously guide science and management of Lesser Scaup populations in an adaptive context. |
format |
Text |
author |
Koons, David N. Rotella, J. J. Willey, D. W. Taper, M. Clark, R. G. Slattery, S. Brook, R. W. Corcoran, R. M. Lovvorn, J. R. |
author_facet |
Koons, David N. Rotella, J. J. Willey, D. W. Taper, M. Clark, R. G. Slattery, S. Brook, R. W. Corcoran, R. M. Lovvorn, J. R. |
author_sort |
Koons, David N. |
title |
Lesser Scaup population dynamics: what can belearned from available data? |
title_short |
Lesser Scaup population dynamics: what can belearned from available data? |
title_full |
Lesser Scaup population dynamics: what can belearned from available data? |
title_fullStr |
Lesser Scaup population dynamics: what can belearned from available data? |
title_full_unstemmed |
Lesser Scaup population dynamics: what can belearned from available data? |
title_sort |
lesser scaup population dynamics: what can belearned from available data? |
publisher |
Hosted by Utah State University Libraries |
publishDate |
2006 |
url |
https://digitalcommons.usu.edu/wild_facpub/277 |
genre |
Aythya marila greater scaup |
genre_facet |
Aythya marila greater scaup |
op_source |
Wildland Resources Faculty Publications |
op_relation |
https://digitalcommons.usu.edu/wild_facpub/277 |
op_rights |
Copyright for this work is held by the author. Transmission or reproduction of materials protected by copyright beyond that allowed by fair use requires the written permission of the copyright owners. Works not in the public domain cannot be commercially exploited without permission of the copyright owner. Responsibility for any use rests exclusively with the user. For more information contact the Institutional Repository Librarian at digitalcommons@usu.edu. |
op_rightsnorm |
PDM |
_version_ |
1766365084749135872 |