Proximate and ultimate control of reproductive effort in northern shovelers (Anas clypeata) nesting at Minto Flats, Alaska
Dissertation (Ph.D.) University of Alaska Fairbanks, 1997 The purpose of this study was to examine factors that influence reproductive effort of female Northern Shovelers (Anas clypeata) nesting at Minto Flats, AK during summer 1991-1993. I investigated the importance of endogenous nutrient reserves...
Main Author: | |
---|---|
Format: | Doctoral or Postdoctoral Thesis |
Language: | unknown |
Published: |
1997
|
Subjects: | |
Online Access: | http://hdl.handle.net/11122/9490 |
id |
ftunivalaska:oai:scholarworks.alaska.edu:11122/9490 |
---|---|
record_format |
openpolar |
spelling |
ftunivalaska:oai:scholarworks.alaska.edu:11122/9490 2023-05-15T13:24:59+02:00 Proximate and ultimate control of reproductive effort in northern shovelers (Anas clypeata) nesting at Minto Flats, Alaska Maccluskie, Margaret Christine 1997 http://hdl.handle.net/11122/9490 unknown http://hdl.handle.net/11122/9490 Ecology Forestry Dissertation phd 1997 ftunivalaska 2023-02-23T21:37:17Z Dissertation (Ph.D.) University of Alaska Fairbanks, 1997 The purpose of this study was to examine factors that influence reproductive effort of female Northern Shovelers (Anas clypeata) nesting at Minto Flats, AK during summer 1991-1993. I investigated the importance of endogenous nutrient reserves to females during egg production and examined changes in organ weights and intestine lengths through the reproductive cycle. Changes in organ weights and intestine length were similar to those of shovelers nesting in Manitoba. Females used neither somatic lipid reserves, protein reserves, nor mineral reserves to produce eggs. Individual variation in somatic lipid reserves was explained by body size and nest initiation date, while variation in somatic protein reserves was explained by standardized nest initiation date. Somatic mineral variation was explained by differences among years. Neither somatic protein nor mineral reserves were reduced during incubation, but somatic lipid reserves decreased significantly. I conclude that endogenous nutrient availability does not proximately limit clutch size during laying for this population, possibly due to high productivity of interior Alaska wetlands and long days. Little is known about nest attendance behavior of ducks in the subarctic; therefore, I examined shoveler nest attendance patterns at Minto Flats to determine if observed patterns differed from those documented for shovelers nesting in Manitoba, Canada. Shovelers nesting at Minto were less attentive and took more frequent, longer recesses than shovelers in Manitoba. I examined patterns of nest attendance during incubation in relation to clutch volume and female weight loss to determine if females make tradeoffs between energy invested in the clutch and energy invested in incubation. I found no evidence of energetic tradeoffs by Shovelers nesting at Minto Flats. To determine if the trait of synchronous hatching could limit clutch size for a species of the genus Anas I measured development time and metabolic rates ... Doctoral or Postdoctoral Thesis Anas clypeata Shoveler Subarctic Alaska University of Alaska: ScholarWorks@UA Canada Fairbanks |
institution |
Open Polar |
collection |
University of Alaska: ScholarWorks@UA |
op_collection_id |
ftunivalaska |
language |
unknown |
topic |
Ecology Forestry |
spellingShingle |
Ecology Forestry Maccluskie, Margaret Christine Proximate and ultimate control of reproductive effort in northern shovelers (Anas clypeata) nesting at Minto Flats, Alaska |
topic_facet |
Ecology Forestry |
description |
Dissertation (Ph.D.) University of Alaska Fairbanks, 1997 The purpose of this study was to examine factors that influence reproductive effort of female Northern Shovelers (Anas clypeata) nesting at Minto Flats, AK during summer 1991-1993. I investigated the importance of endogenous nutrient reserves to females during egg production and examined changes in organ weights and intestine lengths through the reproductive cycle. Changes in organ weights and intestine length were similar to those of shovelers nesting in Manitoba. Females used neither somatic lipid reserves, protein reserves, nor mineral reserves to produce eggs. Individual variation in somatic lipid reserves was explained by body size and nest initiation date, while variation in somatic protein reserves was explained by standardized nest initiation date. Somatic mineral variation was explained by differences among years. Neither somatic protein nor mineral reserves were reduced during incubation, but somatic lipid reserves decreased significantly. I conclude that endogenous nutrient availability does not proximately limit clutch size during laying for this population, possibly due to high productivity of interior Alaska wetlands and long days. Little is known about nest attendance behavior of ducks in the subarctic; therefore, I examined shoveler nest attendance patterns at Minto Flats to determine if observed patterns differed from those documented for shovelers nesting in Manitoba, Canada. Shovelers nesting at Minto were less attentive and took more frequent, longer recesses than shovelers in Manitoba. I examined patterns of nest attendance during incubation in relation to clutch volume and female weight loss to determine if females make tradeoffs between energy invested in the clutch and energy invested in incubation. I found no evidence of energetic tradeoffs by Shovelers nesting at Minto Flats. To determine if the trait of synchronous hatching could limit clutch size for a species of the genus Anas I measured development time and metabolic rates ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Maccluskie, Margaret Christine |
author_facet |
Maccluskie, Margaret Christine |
author_sort |
Maccluskie, Margaret Christine |
title |
Proximate and ultimate control of reproductive effort in northern shovelers (Anas clypeata) nesting at Minto Flats, Alaska |
title_short |
Proximate and ultimate control of reproductive effort in northern shovelers (Anas clypeata) nesting at Minto Flats, Alaska |
title_full |
Proximate and ultimate control of reproductive effort in northern shovelers (Anas clypeata) nesting at Minto Flats, Alaska |
title_fullStr |
Proximate and ultimate control of reproductive effort in northern shovelers (Anas clypeata) nesting at Minto Flats, Alaska |
title_full_unstemmed |
Proximate and ultimate control of reproductive effort in northern shovelers (Anas clypeata) nesting at Minto Flats, Alaska |
title_sort |
proximate and ultimate control of reproductive effort in northern shovelers (anas clypeata) nesting at minto flats, alaska |
publishDate |
1997 |
url |
http://hdl.handle.net/11122/9490 |
geographic |
Canada Fairbanks |
geographic_facet |
Canada Fairbanks |
genre |
Anas clypeata Shoveler Subarctic Alaska |
genre_facet |
Anas clypeata Shoveler Subarctic Alaska |
op_relation |
http://hdl.handle.net/11122/9490 |
_version_ |
1766382903983341568 |