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- W2122912600 abstract "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. * ResumeNous avons developpe un modele stochastique matriciel afin d’evaluer la viabilite des populations et d’estimer l’impact de la mortalite attribuable aux prises illegales ou accidentelles au moment de la chasse aux guillemots (Uria sp.) ainsi que l’impact de la predation par le renard arctique (Alopex lagopus) sur le Petit Pingouin (Alca torda). Deux populations de Petits Pingouins ont ete comparees : une touchee par la chasse et la predation sur les iles Gannet au Labrador, et l’autre, non touchee, sur l’ile Machias Seal au Nouveau-Brunswick. Nous avons estime le taux de croissance potentiel de la population en l’absence de sources de mortalite anthropogenique a l’aide d’estimations de la survie des jeunes provenant de la colonie de Petits Pingouins de l’ile Machias Seal. Nous avons utilise les donnees de predation par le renard arctique sur les iles Gannet de 1978 a 2009 afin d’estimer la variation de la productivite en fonction de la presence du renard. Le taux de croissance intrinseque (λ) de la matrice stochastique, fondee sur les taux vitaux, etait de 0,957±0,008 sur les iles Gannet et de 1,058±0,005 sur l’ile Machias Seal. La mortalite attribuee a la chasse a reduit de 0,033 le taux de croissance predit pour la population des iles Gannet, tandis que la predation par le renard l’a reduit de 0,017. Ces deux sources de mortalite combinees ont reduit de 0,050 le taux de croissance de la population. Selon notre modele, il semble que la population de Petits Pingouins de l’ile Machias Seal croisse rapidement. A l’oppose, il se peut que la population des iles Gannet decroisse, vraisemblablement a cause de la chasse. Toutefois, les conditions oceanographiques differentes entre les deux endroits et le comportement de dispersion incertain chez cette espece contribuent peut-etre egalement a la difference observee entre les deux populations. A partir des resultats obtenus, nous proposons des recommandations pour la conservation et la gestion du Petit Pingouin dans les provinces de l’Atlantique." @default.
- W2122912600 created "2016-06-24" @default.
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- W2122912600 date "2009-01-01" @default.
- W2122912600 modified "2023-09-25" @default.
- W2122912600 title "Contrasting Population Trends at Two Razorbill Colonies in AtlanticCanada: Additive Effects of Fox Predation and Hunting Mortality? * Comparaison de la tendance de deux colonies de Petits Pingouins dans lesprovinces de l’Atlantique : la prédation par le renard et la mortalité parla chasse ont-elles un effet cumulatif?" @default.
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