Contrasting Population Trends at Two Razorbill Colonies in Atlantic Canada: Additive Effects of Fox Predation and Hunting Mortality? * Comparaison de la tendance de deux colonies de Petits Pingouins dans les provinces de l’Atlantique : la prédation par le renard et la mortalité par la chasse ont-elles un effet cumulatif?
We developed a stochastic, stage-based, matrix-projection population model to assess population viability and estimate the impact of mortality caused by hunting, illegal and incidental to the murre (Uria sp.) hunt, and fox (Alopex lagopus) predation on Razorbill (Alca torda) populations breeding on...
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Format: | Article in Journal/Newspaper |
Language: | English |
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Resilience Alliance Publications
2009
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Online Access: | https://research.library.mun.ca/394/ https://research.library.mun.ca/394/1/contrasting_population.pdf https://research.library.mun.ca/394/3/contrasting_population.pdf http://www.ace-eco.org/articles/322.html |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Memorial University of Newfoundland: Research Repository |
op_collection_id |
ftmemorialuniv |
language |
English |
topic |
QH301 Biology QL Zoology |
spellingShingle |
QH301 Biology QL Zoology Lavers, Jennifer L. Jones, Ian L. Robertson, Gregory J. Diamond, Antony W. Contrasting Population Trends at Two Razorbill Colonies in Atlantic Canada: Additive Effects of Fox Predation and Hunting Mortality? * Comparaison de la tendance de deux colonies de Petits Pingouins dans les provinces de l’Atlantique : la prédation par le renard et la mortalité par la chasse ont-elles un effet cumulatif? |
topic_facet |
QH301 Biology QL Zoology |
description |
We developed a stochastic, stage-based, matrix-projection population model to assess population viability and estimate the impact of mortality caused by hunting, illegal and incidental to the murre (Uria sp.) hunt, and fox (Alopex lagopus) predation on Razorbill (Alca torda) populations breeding on the Gannet Islands, Labrador, the “affected” population, and Machias Seal Island, New Brunswick, the “unaffected” population. We estimated the potential population growth rate in the absence of anthropogenic mortality sources by using juvenile survival estimates from the relatively unaffected Machias Seal Island Razorbill population. We used data collected on fox predation on the Gannet Islands from 1978–2009 to estimate the change in productivity as a result of fox presence. The intrinsic growth rate (λ) of the stochastic matrix based on vital rates from the Gannet Islands was 0.957±0.008 and 1.058±0.005 for Machias Seal Island. Hunting mortality reduced the predicted Gannet Islands population growth rate by 0.033, while fox predation reduced population growth rate by 0.017. These sources combined reduced the baseline population growth rate by 0.050. According to our model, the Razorbill population on Machias Seal Island appears to be growing rapidly. In contrast, the Gannet Islands population may decline, likely because of hunting. However, oceanographic differences between the two areas and uncertainty regarding dispersal behavior in this species may also contribute to the disparity between populations. Based on our findings, we make several recommendations for the conservation and management of Razorbills in Atlantic Canada. * Résumé Nous avons développé un modèle stochastique matriciel afin d’évaluer la viabilité des populations et d’estimer l’impact de la mortalité attribuable aux prises illégales ou accidentelles au moment de la chasse aux guillemots (Uria sp.) ainsi que l’impact de la prédation par le renard arctique (Alopex lagopus) sur le Petit Pingouin (Alca torda). Deux populations de Petits Pingouins ont ... |
format |
Article in Journal/Newspaper |
author |
Lavers, Jennifer L. Jones, Ian L. Robertson, Gregory J. Diamond, Antony W. |
author_facet |
Lavers, Jennifer L. Jones, Ian L. Robertson, Gregory J. Diamond, Antony W. |
author_sort |
Lavers, Jennifer L. |
title |
Contrasting Population Trends at Two Razorbill Colonies in Atlantic Canada: Additive Effects of Fox Predation and Hunting Mortality? * Comparaison de la tendance de deux colonies de Petits Pingouins dans les provinces de l’Atlantique : la prédation par le renard et la mortalité par la chasse ont-elles un effet cumulatif? |
title_short |
Contrasting Population Trends at Two Razorbill Colonies in Atlantic Canada: Additive Effects of Fox Predation and Hunting Mortality? * Comparaison de la tendance de deux colonies de Petits Pingouins dans les provinces de l’Atlantique : la prédation par le renard et la mortalité par la chasse ont-elles un effet cumulatif? |
title_full |
Contrasting Population Trends at Two Razorbill Colonies in Atlantic Canada: Additive Effects of Fox Predation and Hunting Mortality? * Comparaison de la tendance de deux colonies de Petits Pingouins dans les provinces de l’Atlantique : la prédation par le renard et la mortalité par la chasse ont-elles un effet cumulatif? |
title_fullStr |
Contrasting Population Trends at Two Razorbill Colonies in Atlantic Canada: Additive Effects of Fox Predation and Hunting Mortality? * Comparaison de la tendance de deux colonies de Petits Pingouins dans les provinces de l’Atlantique : la prédation par le renard et la mortalité par la chasse ont-elles un effet cumulatif? |
title_full_unstemmed |
Contrasting Population Trends at Two Razorbill Colonies in Atlantic Canada: Additive Effects of Fox Predation and Hunting Mortality? * Comparaison de la tendance de deux colonies de Petits Pingouins dans les provinces de l’Atlantique : la prédation par le renard et la mortalité par la chasse ont-elles un effet cumulatif? |
title_sort |
contrasting population trends at two razorbill colonies in atlantic canada: additive effects of fox predation and hunting mortality? * comparaison de la tendance de deux colonies de petits pingouins dans les provinces de l’atlantique : la prédation par le renard et la mortalité par la chasse ont-elles un effet cumulatif? |
publisher |
Resilience Alliance Publications |
publishDate |
2009 |
url |
https://research.library.mun.ca/394/ https://research.library.mun.ca/394/1/contrasting_population.pdf https://research.library.mun.ca/394/3/contrasting_population.pdf http://www.ace-eco.org/articles/322.html |
long_lat |
ENVELOPE(-63.767,-63.767,-65.017,-65.017) ENVELOPE(-56.536,-56.536,53.941,53.941) |
geographic |
Canada Renard Gannet Islands |
geographic_facet |
Canada Renard Gannet Islands |
genre |
Alca torda Alopex lagopus Arctique* petit pingouin Razorbill renard arctique Seal Island uria |
genre_facet |
Alca torda Alopex lagopus Arctique* petit pingouin Razorbill renard arctique Seal Island uria |
op_relation |
https://research.library.mun.ca/394/1/contrasting_population.pdf https://research.library.mun.ca/394/3/contrasting_population.pdf Lavers, Jennifer L. <https://research.library.mun.ca/view/creator_az/Lavers=3AJennifer_L=2E=3A=3A.html> and Jones, Ian L. <https://research.library.mun.ca/view/creator_az/Jones=3AIan_L=2E=3A=3A.html> and Robertson, Gregory J. <https://research.library.mun.ca/view/creator_az/Robertson=3AGregory_J=2E_=3A=3A.html> and Diamond, Antony W. <https://research.library.mun.ca/view/creator_az/Diamond=3AAntony_W=2E_=3A=3A.html> (2009) Contrasting Population Trends at Two Razorbill Colonies in Atlantic Canada: Additive Effects of Fox Predation and Hunting Mortality? * Comparaison de la tendance de deux colonies de Petits Pingouins dans les provinces de l’Atlantique : la prédation par le renard et la mortalité par la chasse ont-elles un effet cumulatif? Avian Conservation and Ecology , 4 (2). pp. 1-17. ISSN 1712-6568 |
op_rights |
cc_by_nc |
_version_ |
1778517213706190848 |
spelling |
ftmemorialuniv:oai:research.library.mun.ca:394 2023-10-01T03:49:56+02:00 Contrasting Population Trends at Two Razorbill Colonies in Atlantic Canada: Additive Effects of Fox Predation and Hunting Mortality? * Comparaison de la tendance de deux colonies de Petits Pingouins dans les provinces de l’Atlantique : la prédation par le renard et la mortalité par la chasse ont-elles un effet cumulatif? Lavers, Jennifer L. Jones, Ian L. Robertson, Gregory J. Diamond, Antony W. 2009 application/pdf https://research.library.mun.ca/394/ https://research.library.mun.ca/394/1/contrasting_population.pdf https://research.library.mun.ca/394/3/contrasting_population.pdf http://www.ace-eco.org/articles/322.html en eng Resilience Alliance Publications https://research.library.mun.ca/394/1/contrasting_population.pdf https://research.library.mun.ca/394/3/contrasting_population.pdf Lavers, Jennifer L. <https://research.library.mun.ca/view/creator_az/Lavers=3AJennifer_L=2E=3A=3A.html> and Jones, Ian L. <https://research.library.mun.ca/view/creator_az/Jones=3AIan_L=2E=3A=3A.html> and Robertson, Gregory J. <https://research.library.mun.ca/view/creator_az/Robertson=3AGregory_J=2E_=3A=3A.html> and Diamond, Antony W. <https://research.library.mun.ca/view/creator_az/Diamond=3AAntony_W=2E_=3A=3A.html> (2009) Contrasting Population Trends at Two Razorbill Colonies in Atlantic Canada: Additive Effects of Fox Predation and Hunting Mortality? * Comparaison de la tendance de deux colonies de Petits Pingouins dans les provinces de l’Atlantique : la prédation par le renard et la mortalité par la chasse ont-elles un effet cumulatif? Avian Conservation and Ecology , 4 (2). pp. 1-17. ISSN 1712-6568 cc_by_nc QH301 Biology QL Zoology Article PeerReviewed 2009 ftmemorialuniv 2023-09-03T06:43:53Z We developed a stochastic, stage-based, matrix-projection population model to assess population viability and estimate the impact of mortality caused by hunting, illegal and incidental to the murre (Uria sp.) hunt, and fox (Alopex lagopus) predation on Razorbill (Alca torda) populations breeding on the Gannet Islands, Labrador, the “affected” population, and Machias Seal Island, New Brunswick, the “unaffected” population. We estimated the potential population growth rate in the absence of anthropogenic mortality sources by using juvenile survival estimates from the relatively unaffected Machias Seal Island Razorbill population. We used data collected on fox predation on the Gannet Islands from 1978–2009 to estimate the change in productivity as a result of fox presence. The intrinsic growth rate (λ) of the stochastic matrix based on vital rates from the Gannet Islands was 0.957±0.008 and 1.058±0.005 for Machias Seal Island. Hunting mortality reduced the predicted Gannet Islands population growth rate by 0.033, while fox predation reduced population growth rate by 0.017. These sources combined reduced the baseline population growth rate by 0.050. According to our model, the Razorbill population on Machias Seal Island appears to be growing rapidly. In contrast, the Gannet Islands population may decline, likely because of hunting. However, oceanographic differences between the two areas and uncertainty regarding dispersal behavior in this species may also contribute to the disparity between populations. Based on our findings, we make several recommendations for the conservation and management of Razorbills in Atlantic Canada. * Résumé Nous avons développé un modèle stochastique matriciel afin d’évaluer la viabilité des populations et d’estimer l’impact de la mortalité attribuable aux prises illégales ou accidentelles au moment de la chasse aux guillemots (Uria sp.) ainsi que l’impact de la prédation par le renard arctique (Alopex lagopus) sur le Petit Pingouin (Alca torda). Deux populations de Petits Pingouins ont ... Article in Journal/Newspaper Alca torda Alopex lagopus Arctique* petit pingouin Razorbill renard arctique Seal Island uria Memorial University of Newfoundland: Research Repository Canada Renard ENVELOPE(-63.767,-63.767,-65.017,-65.017) Gannet Islands ENVELOPE(-56.536,-56.536,53.941,53.941) |