Nutrient-Reserve Dynamics During Egg Production by Female Greater Scaup (Aythya Marila): Relationships with Timing of Reproduction
We studied nutrient-reserve dynamics of female Greater Scaup (Aythya marila) to quantify intraspecific strategies of nutrient acquisition for egg production, particularly in relation to the seasonal timing of reproduction (i.e., date of initiation of rapid follicle growth [RFG]). We collected female...
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American Ornithological Society
2008
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Online Access: | https://doi.org/10.1525/auk.2008.06151 |
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ftbioone:10.1525/auk.2008.06151 2024-05-12T08:01:27+00:00 Nutrient-Reserve Dynamics During Egg Production by Female Greater Scaup (Aythya Marila): Relationships with Timing of Reproduction Kristen B. Gorman Daniel Esler Paul L. Flint Tony D. Williams Kristen B. Gorman Daniel Esler Paul L. Flint Tony D. Williams world 2008-04-01 text/HTML https://doi.org/10.1525/auk.2008.06151 en eng American Ornithological Society doi:10.1525/auk.2008.06151 All rights reserved. https://doi.org/10.1525/auk.2008.06151 Text 2008 ftbioone https://doi.org/10.1525/auk.2008.06151 2024-04-16T02:13:14Z We studied nutrient-reserve dynamics of female Greater Scaup (Aythya marila) to quantify intraspecific strategies of nutrient acquisition for egg production, particularly in relation to the seasonal timing of reproduction (i.e., date of initiation of rapid follicle growth [RFG]). We collected female Greater Scaup on the Yukon-Kuskokwim Delta, Alaska, from arrival through clutch formation during the 2002 and 2003 breeding seasons, and we subsequently conducted standard proximate body-composition analysis. Endogenous lipid, protein, and mineral reserve levels did not decline during egg production. This result differs from most other nutrient-reserve studies of waterfowl, suggesting that female Greater Scaup rely on exogenous food resources, rather than endogenous nutrient reserves, to meet the energy and nutrient costs of clutch formation. Furthermore, endogenous nutrient-reserve levels did not decline with date of RFG initiation, which indicates that body condition at initiation of egg production was similar across the nesting season. We found evidence of nutrient-reserve thresholds for initiation of RFG, in that lipid, protein, and mineral reserves were smaller in nonreproductive than in reproductive females. In light of recent conservation concerns over declining North American scaup populations, our data contrast with nutrient-reserve dynamics described for Lesser Scaup (A. affinis). Text Aythya marila greater scaup Kuskokwim Alaska Yukon BioOne Online Journals Yukon The Auk 125 2 384 394 |
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Open Polar |
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BioOne Online Journals |
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ftbioone |
language |
English |
description |
We studied nutrient-reserve dynamics of female Greater Scaup (Aythya marila) to quantify intraspecific strategies of nutrient acquisition for egg production, particularly in relation to the seasonal timing of reproduction (i.e., date of initiation of rapid follicle growth [RFG]). We collected female Greater Scaup on the Yukon-Kuskokwim Delta, Alaska, from arrival through clutch formation during the 2002 and 2003 breeding seasons, and we subsequently conducted standard proximate body-composition analysis. Endogenous lipid, protein, and mineral reserve levels did not decline during egg production. This result differs from most other nutrient-reserve studies of waterfowl, suggesting that female Greater Scaup rely on exogenous food resources, rather than endogenous nutrient reserves, to meet the energy and nutrient costs of clutch formation. Furthermore, endogenous nutrient-reserve levels did not decline with date of RFG initiation, which indicates that body condition at initiation of egg production was similar across the nesting season. We found evidence of nutrient-reserve thresholds for initiation of RFG, in that lipid, protein, and mineral reserves were smaller in nonreproductive than in reproductive females. In light of recent conservation concerns over declining North American scaup populations, our data contrast with nutrient-reserve dynamics described for Lesser Scaup (A. affinis). |
author2 |
Kristen B. Gorman Daniel Esler Paul L. Flint Tony D. Williams |
format |
Text |
author |
Kristen B. Gorman Daniel Esler Paul L. Flint Tony D. Williams |
spellingShingle |
Kristen B. Gorman Daniel Esler Paul L. Flint Tony D. Williams Nutrient-Reserve Dynamics During Egg Production by Female Greater Scaup (Aythya Marila): Relationships with Timing of Reproduction |
author_facet |
Kristen B. Gorman Daniel Esler Paul L. Flint Tony D. Williams |
author_sort |
Kristen B. Gorman |
title |
Nutrient-Reserve Dynamics During Egg Production by Female Greater Scaup (Aythya Marila): Relationships with Timing of Reproduction |
title_short |
Nutrient-Reserve Dynamics During Egg Production by Female Greater Scaup (Aythya Marila): Relationships with Timing of Reproduction |
title_full |
Nutrient-Reserve Dynamics During Egg Production by Female Greater Scaup (Aythya Marila): Relationships with Timing of Reproduction |
title_fullStr |
Nutrient-Reserve Dynamics During Egg Production by Female Greater Scaup (Aythya Marila): Relationships with Timing of Reproduction |
title_full_unstemmed |
Nutrient-Reserve Dynamics During Egg Production by Female Greater Scaup (Aythya Marila): Relationships with Timing of Reproduction |
title_sort |
nutrient-reserve dynamics during egg production by female greater scaup (aythya marila): relationships with timing of reproduction |
publisher |
American Ornithological Society |
publishDate |
2008 |
url |
https://doi.org/10.1525/auk.2008.06151 |
op_coverage |
world |
geographic |
Yukon |
geographic_facet |
Yukon |
genre |
Aythya marila greater scaup Kuskokwim Alaska Yukon |
genre_facet |
Aythya marila greater scaup Kuskokwim Alaska Yukon |
op_source |
https://doi.org/10.1525/auk.2008.06151 |
op_relation |
doi:10.1525/auk.2008.06151 |
op_rights |
All rights reserved. |
op_doi |
https://doi.org/10.1525/auk.2008.06151 |
container_title |
The Auk |
container_volume |
125 |
container_issue |
2 |
container_start_page |
384 |
op_container_end_page |
394 |
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1798843582664146944 |