Reproductive performance, foraging effort, and diet of an apex predator, the common murre, at one of the largest nesting colonies in the California Current System
"A thesis presented to the faculty of Moss Landing Marine Laboratories." ABSTRACT: Common Murre (Uria aalge) are the most abundant avian apex predator nesting in the California Current System (CCS) and nesting is the most energetically demanding phase of their lifecycle. The preyscape with...
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ftcalifstateuniv:oai:scholarworks:gh93h450g 2024-09-30T14:33:51+00:00 Reproductive performance, foraging effort, and diet of an apex predator, the common murre, at one of the largest nesting colonies in the California Current System Stephanie R. Schneider Birgitte I. McDonald Thomas P. Connolly Daniel C. Barton 2018 https://hdl.handle.net/20.500.12680/gh93h450g English eng Moss Landing Marine Laboratories San José State University http://hdl.handle.net/20.500.12680/gh93h450g http://rightsstatements.org/vocab/InC/1.0/?creator Copyright by Stephanie R. Schneider 2018 California--Castle Rock National Wildlife Refuge Common murre Pacific Ocean--California Current Masters Thesis 2018 ftcalifstateuniv https://doi.org/20.500.12680/gh93h450g 2024-09-10T17:06:14Z "A thesis presented to the faculty of Moss Landing Marine Laboratories." ABSTRACT: Common Murre (Uria aalge) are the most abundant avian apex predator nesting in the California Current System (CCS) and nesting is the most energetically demanding phase of their lifecycle. The preyscape within flight distance of their nesting colony determines whether murres produce young, how hard they must work to do so, and what prey types are available to them. This study characterized the reproductive performance, foraging effort, and prey composition of murres nesting at a previously unstudied and large nesting colony in the CCS, Castle Rock National Wildlife Refuge, over an 11-year period (2007 - 2017) intended to capture a representative range of prey conditions. Timing of upwelling, coincident with seasonal increase in prey, accounted for 70% of the variability in nest initiation by murres. Reproductive success averaged 61% and, even in the most successful years, murres approached their behavioral limit to increase foraging effort and obtain adequate prey; crossing this threshold resulted in chicks being left unattended and widespread nest failure in 3 study years (2007, 2016, and 2017). Smelt and rockfish dominated the diet in good years and anchovy dominated in bad years. Prey available to murres nesting at this large colony closely matched the amount of prey required for them to produce young and, based on current conditions, even small shifts causing demand to exceed availability could result in large-scale reproductive failure of murres as well as other seabirds nesting here. RELATED TITLE: https://csu-mlml.primo.exlibrisgroup.com/permalink/01CALS_MLM/136dcpr/alma991000261289702913 Master Thesis Common Murre Uria aalge Castle Rock uria Scholarworks from California State University Pacific Castle Rock ENVELOPE(-130.208,-130.208,57.840,57.840) |
institution |
Open Polar |
collection |
Scholarworks from California State University |
op_collection_id |
ftcalifstateuniv |
language |
English |
topic |
California--Castle Rock National Wildlife Refuge Common murre Pacific Ocean--California Current |
spellingShingle |
California--Castle Rock National Wildlife Refuge Common murre Pacific Ocean--California Current Stephanie R. Schneider Reproductive performance, foraging effort, and diet of an apex predator, the common murre, at one of the largest nesting colonies in the California Current System |
topic_facet |
California--Castle Rock National Wildlife Refuge Common murre Pacific Ocean--California Current |
description |
"A thesis presented to the faculty of Moss Landing Marine Laboratories." ABSTRACT: Common Murre (Uria aalge) are the most abundant avian apex predator nesting in the California Current System (CCS) and nesting is the most energetically demanding phase of their lifecycle. The preyscape within flight distance of their nesting colony determines whether murres produce young, how hard they must work to do so, and what prey types are available to them. This study characterized the reproductive performance, foraging effort, and prey composition of murres nesting at a previously unstudied and large nesting colony in the CCS, Castle Rock National Wildlife Refuge, over an 11-year period (2007 - 2017) intended to capture a representative range of prey conditions. Timing of upwelling, coincident with seasonal increase in prey, accounted for 70% of the variability in nest initiation by murres. Reproductive success averaged 61% and, even in the most successful years, murres approached their behavioral limit to increase foraging effort and obtain adequate prey; crossing this threshold resulted in chicks being left unattended and widespread nest failure in 3 study years (2007, 2016, and 2017). Smelt and rockfish dominated the diet in good years and anchovy dominated in bad years. Prey available to murres nesting at this large colony closely matched the amount of prey required for them to produce young and, based on current conditions, even small shifts causing demand to exceed availability could result in large-scale reproductive failure of murres as well as other seabirds nesting here. RELATED TITLE: https://csu-mlml.primo.exlibrisgroup.com/permalink/01CALS_MLM/136dcpr/alma991000261289702913 |
author2 |
Birgitte I. McDonald Thomas P. Connolly Daniel C. Barton |
format |
Master Thesis |
author |
Stephanie R. Schneider |
author_facet |
Stephanie R. Schneider |
author_sort |
Stephanie R. Schneider |
title |
Reproductive performance, foraging effort, and diet of an apex predator, the common murre, at one of the largest nesting colonies in the California Current System |
title_short |
Reproductive performance, foraging effort, and diet of an apex predator, the common murre, at one of the largest nesting colonies in the California Current System |
title_full |
Reproductive performance, foraging effort, and diet of an apex predator, the common murre, at one of the largest nesting colonies in the California Current System |
title_fullStr |
Reproductive performance, foraging effort, and diet of an apex predator, the common murre, at one of the largest nesting colonies in the California Current System |
title_full_unstemmed |
Reproductive performance, foraging effort, and diet of an apex predator, the common murre, at one of the largest nesting colonies in the California Current System |
title_sort |
reproductive performance, foraging effort, and diet of an apex predator, the common murre, at one of the largest nesting colonies in the california current system |
publisher |
Moss Landing Marine Laboratories |
publishDate |
2018 |
url |
https://hdl.handle.net/20.500.12680/gh93h450g |
long_lat |
ENVELOPE(-130.208,-130.208,57.840,57.840) |
geographic |
Pacific Castle Rock |
geographic_facet |
Pacific Castle Rock |
genre |
Common Murre Uria aalge Castle Rock uria |
genre_facet |
Common Murre Uria aalge Castle Rock uria |
op_relation |
http://hdl.handle.net/20.500.12680/gh93h450g |
op_rights |
http://rightsstatements.org/vocab/InC/1.0/?creator Copyright by Stephanie R. Schneider 2018 |
op_doi |
https://doi.org/20.500.12680/gh93h450g |
_version_ |
1811637628983836672 |