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...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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PeerJ Inc.
2021-11-01
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| Series: | PeerJ |
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| Online Access: | https://peerj.com/articles/12404.pdf |
| _version_ | 1797424427323883520 |
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| author | Frédéric Barraquand Ólafur K. Nielsen |
| author_facet | Frédéric Barraquand Ólafur K. Nielsen |
| author_sort | Frédéric Barraquand |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-03-09T08:02:03Z |
| format | Article |
| id | doaj.art-edb0ec0a98784933adca7fe6da354ddf |
| institution | Directory Open Access Journal |
| issn | 2167-8359 |
| language | English |
| last_indexed | 2024-03-09T08:02:03Z |
| publishDate | 2021-11-01 |
| publisher | PeerJ Inc. |
| record_format | Article |
| series | PeerJ |
| spelling | doaj.art-edb0ec0a98784933adca7fe6da354ddf2023-12-03T00:40:54ZengPeerJ Inc.PeerJ2167-83592021-11-019e1240410.7717/peerj.12404Survival rates of adult and juvenile gyrfalcons in Iceland: estimates and driversFrédéric Barraquand0Ólafur K. Nielsen1Institute of Mathematics of Bordeaux, CNRS, Talence, FranceIcelandic Institute of Natural History, Garðabær, IcelandKnowledge 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.https://peerj.com/articles/12404.pdfGyrfalconSurvivalIcelandCapture-recaptureMark-recovery |
| spellingShingle | Frédéric Barraquand Ólafur K. Nielsen Survival rates of adult and juvenile gyrfalcons in Iceland: estimates and drivers PeerJ Gyrfalcon Survival Iceland Capture-recapture Mark-recovery |
| title | 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_short | 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 |
| topic | Gyrfalcon Survival Iceland Capture-recapture Mark-recovery |
| url | https://peerj.com/articles/12404.pdf |
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