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Survival estimates, mortality patterns, and population growth of Fennoscandian mallards Anas platyrhynchos

Gunnarsson, Gunnar; Elmberg, Johan; Dessborn, Lisa; Jonzén, Niclas LU ; Poysa, Hannu and Valkama, Jari (2008) In Annales Zoologici Fennici 45(6). p.483-495
Abstract
Long-term mallard capture-recapture data from Sweden and Finland were analyzed to describe temporal mortality patterns and reasons. We used program MARK and Seber models to estimate annual survival (S) and recovery (r) rates. Survival rates were used in a Monte Carlo simulation to evaluate the correspondence between observed and predicted annual population sizes of a Finnish sub-population. About 90% of recovered birds died from hunting. Most recoveries were from the hunting season, and more males than females were shot. Predation was the most common cause of natural mortality. Finnish capture-recapture data fitted best the global model in which survival and recovery vary with age and sex. Annual survival and recovery rates for adult and... (More)
Long-term mallard capture-recapture data from Sweden and Finland were analyzed to describe temporal mortality patterns and reasons. We used program MARK and Seber models to estimate annual survival (S) and recovery (r) rates. Survival rates were used in a Monte Carlo simulation to evaluate the correspondence between observed and predicted annual population sizes of a Finnish sub-population. About 90% of recovered birds died from hunting. Most recoveries were from the hunting season, and more males than females were shot. Predation was the most common cause of natural mortality. Finnish capture-recapture data fitted best the global model in which survival and recovery vary with age and sex. Annual survival and recovery rates for adult and juvenile males and females were overlapping, ranging from 0.46 to 0.90 (survival) and 0.07 to 0.17 (recovery), whereas pulli had lower survival rates (0.21-0.42). Pulli that were successfully sexed at the time of ringing had higher recovery rates (female pulli: 0.23; male pulli: 0.32) than juveniles and adults. Density-dependent fledgling production was detected in the Finnish sub-population and was accounted for in the Monte Carlo simulation, which estimated predicted breeding population size quite well, although one of the observed annual values (2003) fell outside the 95% confidence limits. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
in
Annales Zoologici Fennici
volume
45
issue
6
pages
483 - 495
publisher
Finnish Zoological and Botanical Publishing Board
external identifiers
  • wos:000262882600003
  • scopus:59149099949
ISSN
0003-455X
language
English
LU publication?
yes
id
1d9fcdb4-487e-4c82-8202-31d85b53f36e (old id 1375829)
date added to LUP
2009-05-08 16:58:52
date last changed
2017-04-09 04:00:31
@article{1d9fcdb4-487e-4c82-8202-31d85b53f36e,
  abstract     = {Long-term mallard capture-recapture data from Sweden and Finland were analyzed to describe temporal mortality patterns and reasons. We used program MARK and Seber models to estimate annual survival (S) and recovery (r) rates. Survival rates were used in a Monte Carlo simulation to evaluate the correspondence between observed and predicted annual population sizes of a Finnish sub-population. About 90% of recovered birds died from hunting. Most recoveries were from the hunting season, and more males than females were shot. Predation was the most common cause of natural mortality. Finnish capture-recapture data fitted best the global model in which survival and recovery vary with age and sex. Annual survival and recovery rates for adult and juvenile males and females were overlapping, ranging from 0.46 to 0.90 (survival) and 0.07 to 0.17 (recovery), whereas pulli had lower survival rates (0.21-0.42). Pulli that were successfully sexed at the time of ringing had higher recovery rates (female pulli: 0.23; male pulli: 0.32) than juveniles and adults. Density-dependent fledgling production was detected in the Finnish sub-population and was accounted for in the Monte Carlo simulation, which estimated predicted breeding population size quite well, although one of the observed annual values (2003) fell outside the 95% confidence limits.},
  author       = {Gunnarsson, Gunnar and Elmberg, Johan and Dessborn, Lisa and Jonzén, Niclas and Poysa, Hannu and Valkama, Jari},
  issn         = {0003-455X},
  language     = {eng},
  number       = {6},
  pages        = {483--495},
  publisher    = {Finnish Zoological and Botanical Publishing Board},
  series       = {Annales Zoologici Fennici},
  title        = {Survival estimates, mortality patterns, and population growth of Fennoscandian mallards Anas platyrhynchos},
  volume       = {45},
  year         = {2008},
}