Effects of age- and sex-biased dispersal on the estimation of survival rates of the Sand Martin Riparia riparia population in Hungary

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Abstract

Intensive ringing of the large Sand Martin Riparia riparia population of Eastern Hungary has been carried out at breeding colonies since 1986. Previous survival modelling has shown a close relationship between the adult survival rates and Sahelian weather conditions. The detection of such environmental effects on juvenile survival is more complicated because mortality is confounded with dispersal, which varies with age and sex. Although juveniles cannot be sexed by morphological characters, this study examines models of the survival and recapture rates of birds ringed as juvenile males and females separately by assuming a 1:1 sex ratio among juveniles at ringing. Using this approach it was possible to identify biologically realistic models which described the data, but different models were selected for each sex. To study variation in the survival rates of birds ringed as juveniles, it is thus important to model survival and recapture rates for each sex separately. The methods presented here require further development. It was not possible to produce unambiguous evidence of real differences in the survival rates of one-year-old and older birds because age- and sex-related differences in dispersal could affect the results.

Original languageEnglish
JournalBird Study
Volume46
Issue numberSUPPL.
Publication statusPublished - 1999

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Hungary
survival rate
sand
gender
ringing
birds
bird
age-related difference
sex-related difference
sex ratio
weather
breeding population
Riparia riparia
effect
rate
environmental effect
breeding
mortality
modeling
methodology

ASJC Scopus subject areas

  • Animal Science and Zoology

Cite this

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title = "Effects of age- and sex-biased dispersal on the estimation of survival rates of the Sand Martin Riparia riparia population in Hungary",
abstract = "Intensive ringing of the large Sand Martin Riparia riparia population of Eastern Hungary has been carried out at breeding colonies since 1986. Previous survival modelling has shown a close relationship between the adult survival rates and Sahelian weather conditions. The detection of such environmental effects on juvenile survival is more complicated because mortality is confounded with dispersal, which varies with age and sex. Although juveniles cannot be sexed by morphological characters, this study examines models of the survival and recapture rates of birds ringed as juvenile males and females separately by assuming a 1:1 sex ratio among juveniles at ringing. Using this approach it was possible to identify biologically realistic models which described the data, but different models were selected for each sex. To study variation in the survival rates of birds ringed as juveniles, it is thus important to model survival and recapture rates for each sex separately. The methods presented here require further development. It was not possible to produce unambiguous evidence of real differences in the survival rates of one-year-old and older birds because age- and sex-related differences in dispersal could affect the results.",
author = "T. Sz{\'e}p",
year = "1999",
language = "English",
volume = "46",
journal = "Bird Study",
issn = "0006-3657",
publisher = "Taylor and Francis Ltd.",
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T1 - Effects of age- and sex-biased dispersal on the estimation of survival rates of the Sand Martin Riparia riparia population in Hungary

AU - Szép, T.

PY - 1999

Y1 - 1999

N2 - Intensive ringing of the large Sand Martin Riparia riparia population of Eastern Hungary has been carried out at breeding colonies since 1986. Previous survival modelling has shown a close relationship between the adult survival rates and Sahelian weather conditions. The detection of such environmental effects on juvenile survival is more complicated because mortality is confounded with dispersal, which varies with age and sex. Although juveniles cannot be sexed by morphological characters, this study examines models of the survival and recapture rates of birds ringed as juvenile males and females separately by assuming a 1:1 sex ratio among juveniles at ringing. Using this approach it was possible to identify biologically realistic models which described the data, but different models were selected for each sex. To study variation in the survival rates of birds ringed as juveniles, it is thus important to model survival and recapture rates for each sex separately. The methods presented here require further development. It was not possible to produce unambiguous evidence of real differences in the survival rates of one-year-old and older birds because age- and sex-related differences in dispersal could affect the results.

AB - Intensive ringing of the large Sand Martin Riparia riparia population of Eastern Hungary has been carried out at breeding colonies since 1986. Previous survival modelling has shown a close relationship between the adult survival rates and Sahelian weather conditions. The detection of such environmental effects on juvenile survival is more complicated because mortality is confounded with dispersal, which varies with age and sex. Although juveniles cannot be sexed by morphological characters, this study examines models of the survival and recapture rates of birds ringed as juvenile males and females separately by assuming a 1:1 sex ratio among juveniles at ringing. Using this approach it was possible to identify biologically realistic models which described the data, but different models were selected for each sex. To study variation in the survival rates of birds ringed as juveniles, it is thus important to model survival and recapture rates for each sex separately. The methods presented here require further development. It was not possible to produce unambiguous evidence of real differences in the survival rates of one-year-old and older birds because age- and sex-related differences in dispersal could affect the results.

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