Effects of Management on Double-Crested Cormorant Nesting Colony Fidelity
The increase of double-crested cormorant (Phalacrocorax auritus; hereafter, cormorant) populations during the last 2 decades has impacted many stakeholder groups. The negative effects of nesting cormorants on trees and other vegetation have motivated private organizations and government agencies to...
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The Wildlife Society
2011
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ftbioone:10.1002/jwmg.141 2023-07-30T04:07:28+02:00 Effects of Management on Double-Crested Cormorant Nesting Colony Fidelity Bronson K. Strickland Brian S. Dorr Fred Pogmore Gary Nohrenberg Scott C. Barras John E. McConnell John Gobeille Bronson K. Strickland Brian S. Dorr Fred Pogmore Gary Nohrenberg Scott C. Barras John E. McConnell John Gobeille world 2011-06-01 text/HTML https://doi.org/10.1002/jwmg.141 en eng The Wildlife Society doi:10.1002/jwmg.141 All rights reserved. https://doi.org/10.1002/jwmg.141 Text 2011 ftbioone https://doi.org/10.1002/jwmg.141 2023-07-09T08:15:12Z The increase of double-crested cormorant (Phalacrocorax auritus; hereafter, cormorant) populations during the last 2 decades has impacted many stakeholder groups. The negative effects of nesting cormorants on trees and other vegetation have motivated private organizations and government agencies to manage nesting colonies and reduce their impacts to private property and public resources. Management-induced reproductive failure has been shown to influence cormorant inter-annual nesting colony fidelity, but not complete abandonment from a nesting colony site. We attached very high frequency (VHF) transmitters and Global Positioning System (GPS) transmitters to nesting cormorants to monitor their movement response on a managed site (Young Island, VT [YI]) and an unmanaged site (Four Brothers Islands, NY [FB]). Additionally, we monitored these sites to determine the influence of management activities on subsequent-year colonization. On YI, management consisted of egg-oiling all cormorant nests (some nests had been oiled in previous years) and culling approximately 20% of adults. Annual dispersal rates did not differ between managed and unmanaged sites, but a nesting period interaction occurred with greater dispersal on the managed site following the incubation period. After 4 years of both egg oiling and culling, cormorant nesting on YI declined to zero. Simultaneously, cormorant numbers increased on the nearby unmanaged FB. We propose either the cumulative effect of partial or complete reproductive failure (8 yr) or simply the inclusion of adult culling (4 yr) caused the abandonment. From a colony-specific management perspective, the rapid decline was beneficial to the goal of restoring the vegetative community on YI. The effects of adult culling at nesting colonies, prior-year reproductive failure caused by egg oiling, or the combination of these factors may be required for complete and rapid nesting site abandonment. The use of culling adult breeders reduced nesting and likely limits the cost and logistics of ... Text Young Island BioOne Online Journals Young Island ENVELOPE(162.400,162.400,-66.417,-66.417) The Journal of Wildlife Management 75 5 1012 1021 |
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ftbioone |
language |
English |
description |
The increase of double-crested cormorant (Phalacrocorax auritus; hereafter, cormorant) populations during the last 2 decades has impacted many stakeholder groups. The negative effects of nesting cormorants on trees and other vegetation have motivated private organizations and government agencies to manage nesting colonies and reduce their impacts to private property and public resources. Management-induced reproductive failure has been shown to influence cormorant inter-annual nesting colony fidelity, but not complete abandonment from a nesting colony site. We attached very high frequency (VHF) transmitters and Global Positioning System (GPS) transmitters to nesting cormorants to monitor their movement response on a managed site (Young Island, VT [YI]) and an unmanaged site (Four Brothers Islands, NY [FB]). Additionally, we monitored these sites to determine the influence of management activities on subsequent-year colonization. On YI, management consisted of egg-oiling all cormorant nests (some nests had been oiled in previous years) and culling approximately 20% of adults. Annual dispersal rates did not differ between managed and unmanaged sites, but a nesting period interaction occurred with greater dispersal on the managed site following the incubation period. After 4 years of both egg oiling and culling, cormorant nesting on YI declined to zero. Simultaneously, cormorant numbers increased on the nearby unmanaged FB. We propose either the cumulative effect of partial or complete reproductive failure (8 yr) or simply the inclusion of adult culling (4 yr) caused the abandonment. From a colony-specific management perspective, the rapid decline was beneficial to the goal of restoring the vegetative community on YI. The effects of adult culling at nesting colonies, prior-year reproductive failure caused by egg oiling, or the combination of these factors may be required for complete and rapid nesting site abandonment. The use of culling adult breeders reduced nesting and likely limits the cost and logistics of ... |
author2 |
Bronson K. Strickland Brian S. Dorr Fred Pogmore Gary Nohrenberg Scott C. Barras John E. McConnell John Gobeille |
format |
Text |
author |
Bronson K. Strickland Brian S. Dorr Fred Pogmore Gary Nohrenberg Scott C. Barras John E. McConnell John Gobeille |
spellingShingle |
Bronson K. Strickland Brian S. Dorr Fred Pogmore Gary Nohrenberg Scott C. Barras John E. McConnell John Gobeille Effects of Management on Double-Crested Cormorant Nesting Colony Fidelity |
author_facet |
Bronson K. Strickland Brian S. Dorr Fred Pogmore Gary Nohrenberg Scott C. Barras John E. McConnell John Gobeille |
author_sort |
Bronson K. Strickland |
title |
Effects of Management on Double-Crested Cormorant Nesting Colony Fidelity |
title_short |
Effects of Management on Double-Crested Cormorant Nesting Colony Fidelity |
title_full |
Effects of Management on Double-Crested Cormorant Nesting Colony Fidelity |
title_fullStr |
Effects of Management on Double-Crested Cormorant Nesting Colony Fidelity |
title_full_unstemmed |
Effects of Management on Double-Crested Cormorant Nesting Colony Fidelity |
title_sort |
effects of management on double-crested cormorant nesting colony fidelity |
publisher |
The Wildlife Society |
publishDate |
2011 |
url |
https://doi.org/10.1002/jwmg.141 |
op_coverage |
world |
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ENVELOPE(162.400,162.400,-66.417,-66.417) |
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Young Island |
geographic_facet |
Young Island |
genre |
Young Island |
genre_facet |
Young Island |
op_source |
https://doi.org/10.1002/jwmg.141 |
op_relation |
doi:10.1002/jwmg.141 |
op_rights |
All rights reserved. |
op_doi |
https://doi.org/10.1002/jwmg.141 |
container_title |
The Journal of Wildlife Management |
container_volume |
75 |
container_issue |
5 |
container_start_page |
1012 |
op_container_end_page |
1021 |
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1772820775439433728 |