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The demographic drivers of local population dynamics in two rare migratory birds

The exchange of individuals among populations can have strong effects on the dynamics and persistence of a given population. Yet, estimation of immigration rates remains one of the greatest challenges for animal demographers. Little empirical knowledge exists about the effects of immigration on popu... Full description

Journal Title: Oecologia 2012-01-01, Vol.168 (1), p.97-108
Main Author: Schaub, Michael
Other Authors: Reichlin, Thomas S , Abadi, Fitsum , Kéry, Marc , Jenni, Lukas , Arlettaz, Raphaël
Format: Electronic Article Electronic Article
Language: English
Subjects:
Publisher: Berlin/Heidelberg: Springer
ID: ISSN: 0029-8549
Link: https://www.ncbi.nlm.nih.gov/pubmed/21786022
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recordid: cdi_pubmed_primary_21786022
title: The demographic drivers of local population dynamics in two rare migratory birds
format: Article
creator:
  • Schaub, Michael
  • Reichlin, Thomas S
  • Abadi, Fitsum
  • Kéry, Marc
  • Jenni, Lukas
  • Arlettaz, Raphaël
subjects:
  • Age Factors
  • Analysis
  • Animal Migration
  • Animals
  • Automobile drivers
  • Aves
  • Bayes Theorem
  • Bayesian analysis
  • Biomedical and Life Sciences
  • Birds
  • Breeding
  • Conservation
  • Demography
  • Ecology
  • Emigration and immigration
  • Fecundity
  • Female
  • Fertility
  • Growth rate
  • Hydrology/Water Resources
  • Immigration
  • Jynx torquilla
  • Life Sciences
  • Male
  • Mathematical models
  • Migratory birds
  • Models, Theoretical
  • Mortality
  • Plant Sciences
  • Population Dynamics
  • Population ecology
  • Population ecology - Original Paper
  • Population estimates
  • Population Growth
  • Population growth rate
  • Population studies
  • Rare species
  • Recruitment
  • Survival
  • Switzerland
  • Torticollis
  • Upupa epops
ispartof: Oecologia, 2012-01-01, Vol.168 (1), p.97-108
description: The exchange of individuals among populations can have strong effects on the dynamics and persistence of a given population. Yet, estimation of immigration rates remains one of the greatest challenges for animal demographers. Little empirical knowledge exists about the effects of immigration on population dynamics. New integrated population models fitted using Bayesian methods enable simultaneous estimation of fecundity, survival and immigration, as well as the growth rate of a population of interest. We applied this novel analytical framework to the demography of two populations of long-distance migratory birds, hoopoe Upupa epops and wryneck Jynx torquilla, in a study area in south-western Switzerland. During 2002-2010, the hoopoe population increased annually by 11%, while the wryneck population remained fairly stable. Apparent juvenile and adult survival probability was nearly identical in both species, but fecundity and immigration were slightly higher in the hoopoe. Hoopoe population growth rate was strongly correlated with juvenile survival, fecundity and immigration, while that of wrynecks strongly correlated only with immigration. This indicates that demographic components impacting the arrival of new individuals into the populations were more important for their dynamics than demographic components affecting the loss of individuals. The finding that immigration plays a crucial role in the population growth rates of these two rare species emphasizes the need for a broad rather than local perspective for population studies, and the development of wide-scale conservation actions.
language: eng
source:
identifier: ISSN: 0029-8549
fulltext: no_fulltext
issn:
  • 0029-8549
  • 1432-1939
url: Link


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descriptionThe exchange of individuals among populations can have strong effects on the dynamics and persistence of a given population. Yet, estimation of immigration rates remains one of the greatest challenges for animal demographers. Little empirical knowledge exists about the effects of immigration on population dynamics. New integrated population models fitted using Bayesian methods enable simultaneous estimation of fecundity, survival and immigration, as well as the growth rate of a population of interest. We applied this novel analytical framework to the demography of two populations of long-distance migratory birds, hoopoe Upupa epops and wryneck Jynx torquilla, in a study area in south-western Switzerland. During 2002-2010, the hoopoe population increased annually by 11%, while the wryneck population remained fairly stable. Apparent juvenile and adult survival probability was nearly identical in both species, but fecundity and immigration were slightly higher in the hoopoe. Hoopoe population growth rate was strongly correlated with juvenile survival, fecundity and immigration, while that of wrynecks strongly correlated only with immigration. This indicates that demographic components impacting the arrival of new individuals into the populations were more important for their dynamics than demographic components affecting the loss of individuals. The finding that immigration plays a crucial role in the population growth rates of these two rare species emphasizes the need for a broad rather than local perspective for population studies, and the development of wide-scale conservation actions.
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subjectAge Factors ; Analysis ; Animal Migration ; Animals ; Automobile drivers ; Aves ; Bayes Theorem ; Bayesian analysis ; Biomedical and Life Sciences ; Birds ; Breeding ; Conservation ; Demography ; Ecology ; Emigration and immigration ; Fecundity ; Female ; Fertility ; Growth rate ; Hydrology/Water Resources ; Immigration ; Jynx torquilla ; Life Sciences ; Male ; Mathematical models ; Migratory birds ; Models, Theoretical ; Mortality ; Plant Sciences ; Population Dynamics ; Population ecology ; Population ecology - Original Paper ; Population estimates ; Population Growth ; Population growth rate ; Population studies ; Rare species ; Recruitment ; Survival ; Switzerland ; Torticollis ; Upupa epops
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descriptionThe exchange of individuals among populations can have strong effects on the dynamics and persistence of a given population. Yet, estimation of immigration rates remains one of the greatest challenges for animal demographers. Little empirical knowledge exists about the effects of immigration on population dynamics. New integrated population models fitted using Bayesian methods enable simultaneous estimation of fecundity, survival and immigration, as well as the growth rate of a population of interest. We applied this novel analytical framework to the demography of two populations of long-distance migratory birds, hoopoe Upupa epops and wryneck Jynx torquilla, in a study area in south-western Switzerland. During 2002-2010, the hoopoe population increased annually by 11%, while the wryneck population remained fairly stable. Apparent juvenile and adult survival probability was nearly identical in both species, but fecundity and immigration were slightly higher in the hoopoe. Hoopoe population growth rate was strongly correlated with juvenile survival, fecundity and immigration, while that of wrynecks strongly correlated only with immigration. This indicates that demographic components impacting the arrival of new individuals into the populations were more important for their dynamics than demographic components affecting the loss of individuals. The finding that immigration plays a crucial role in the population growth rates of these two rare species emphasizes the need for a broad rather than local perspective for population studies, and the development of wide-scale conservation actions.
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abstractThe exchange of individuals among populations can have strong effects on the dynamics and persistence of a given population. Yet, estimation of immigration rates remains one of the greatest challenges for animal demographers. Little empirical knowledge exists about the effects of immigration on population dynamics. New integrated population models fitted using Bayesian methods enable simultaneous estimation of fecundity, survival and immigration, as well as the growth rate of a population of interest. We applied this novel analytical framework to the demography of two populations of long-distance migratory birds, hoopoe Upupa epops and wryneck Jynx torquilla, in a study area in south-western Switzerland. During 2002-2010, the hoopoe population increased annually by 11%, while the wryneck population remained fairly stable. Apparent juvenile and adult survival probability was nearly identical in both species, but fecundity and immigration were slightly higher in the hoopoe. Hoopoe population growth rate was strongly correlated with juvenile survival, fecundity and immigration, while that of wrynecks strongly correlated only with immigration. This indicates that demographic components impacting the arrival of new individuals into the populations were more important for their dynamics than demographic components affecting the loss of individuals. The finding that immigration plays a crucial role in the population growth rates of these two rare species emphasizes the need for a broad rather than local perspective for population studies, and the development of wide-scale conservation actions.
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