Survival rates of adult and juvenile gyrfalcons in Iceland: estimates and drivers

Knowledge of survival rates and their potential covariation with environmental drivers, for both adults and juveniles, is paramount to forecast the population dynamics of long-lived animals. Long-lived bird and mammal populations are indeed very sensitive to change in survival rates, especially that...

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Autores principales:	Frédéric Barraquand, Ólafur K. Nielsen
Formato:	article
Lenguaje:	EN
Publicado:	PeerJ Inc. 2021
Materias:	Gyrfalcon Survival Iceland Capture-recapture Mark-recovery Medicine R
Acceso en línea:	https://doaj.org/article/edb0ec0a98784933adca7fe6da354ddf
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id	oai:doaj.org-article:edb0ec0a98784933adca7fe6da354ddf
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spelling	oai:doaj.org-article:edb0ec0a98784933adca7fe6da354ddf2021-11-25T15:05:10ZSurvival rates of adult and juvenile gyrfalcons in Iceland: estimates and drivers10.7717/peerj.124042167-8359https://doaj.org/article/edb0ec0a98784933adca7fe6da354ddf2021-11-01T00:00:00Zhttps://peerj.com/articles/12404.pdfhttps://peerj.com/articles/12404/https://doaj.org/toc/2167-8359Knowledge of survival rates and their potential covariation with environmental drivers, for both adults and juveniles, is paramount to forecast the population dynamics of long-lived animals. Long-lived bird and mammal populations are indeed very sensitive to change in survival rates, especially that of adults. Here we report the first survival estimates for the Icelandic gyrfalcon (Falco rusticolus) obtained by capture-mark-recapture methods. We use a mark-recapture-recovery model combining live and dead encounters into a unified analysis, in a Bayesian framework. Annual survival was estimated at 0.83 for adults and 0.40 for juveniles. Positive effects of main prey density on juvenile survival (5% increase in survival from min to max density) were possible though not likely. Weather effects on juvenile survival were even less likely. The variability in observed lifespan suggests that adult birds could suffer from human-induced alteration of survival rates.Frédéric BarraquandÓlafur K. NielsenPeerJ Inc.articleGyrfalconSurvivalIcelandCapture-recaptureMark-recoveryMedicineRENPeerJ, Vol 9, p e12404 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Gyrfalcon Survival Iceland Capture-recapture Mark-recovery Medicine R
spellingShingle	Gyrfalcon Survival Iceland Capture-recapture Mark-recovery Medicine R Frédéric Barraquand Ólafur K. Nielsen Survival rates of adult and juvenile gyrfalcons in Iceland: estimates and drivers
description	Knowledge of survival rates and their potential covariation with environmental drivers, for both adults and juveniles, is paramount to forecast the population dynamics of long-lived animals. Long-lived bird and mammal populations are indeed very sensitive to change in survival rates, especially that of adults. Here we report the first survival estimates for the Icelandic gyrfalcon (Falco rusticolus) obtained by capture-mark-recapture methods. We use a mark-recapture-recovery model combining live and dead encounters into a unified analysis, in a Bayesian framework. Annual survival was estimated at 0.83 for adults and 0.40 for juveniles. Positive effects of main prey density on juvenile survival (5% increase in survival from min to max density) were possible though not likely. Weather effects on juvenile survival were even less likely. The variability in observed lifespan suggests that adult birds could suffer from human-induced alteration of survival rates.
format	article
author	Frédéric Barraquand Ólafur K. Nielsen
author_facet	Frédéric Barraquand Ólafur K. Nielsen
author_sort	Frédéric Barraquand
title	Survival rates of adult and juvenile gyrfalcons in Iceland: estimates and drivers
title_short	Survival rates of adult and juvenile gyrfalcons in Iceland: estimates and drivers
title_full	Survival rates of adult and juvenile gyrfalcons in Iceland: estimates and drivers
title_fullStr	Survival rates of adult and juvenile gyrfalcons in Iceland: estimates and drivers
title_full_unstemmed	Survival rates of adult and juvenile gyrfalcons in Iceland: estimates and drivers
title_sort	survival rates of adult and juvenile gyrfalcons in iceland: estimates and drivers
publisher	PeerJ Inc.
publishDate	2021
url	https://doaj.org/article/edb0ec0a98784933adca7fe6da354ddf
work_keys_str_mv	AT fredericbarraquand survivalratesofadultandjuvenilegyrfalconsinicelandestimatesanddrivers AT olafurknielsen survivalratesofadultandjuvenilegyrfalconsinicelandestimatesanddrivers
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Survival rates of adult and juvenile gyrfalcons in Iceland: estimates and drivers

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