Apparent breeding success drives long-term population dynamics of a migratory swan
The ability of a species to adapt to environmental change is ultimately reflected in its vital rates – i.e., survival and reproductive success of individuals. Together, vital rates determine trends in numbers, commonly monitored using counts of species abundance. Rapid changes in abundance can give...
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ftzenodo:oai:zenodo.org:4086400 2024-09-15T18:03:25+00:00 Apparent breeding success drives long-term population dynamics of a migratory swan Nuijten, Rascha Vriend, Stefan Wood, Kevin Haitjema, Trinus Rees, Eileen Jongejans, Eelke Nolet, Bart 2020-09-28 https://doi.org/10.5061/dryad.g1jwstqpj unknown Zenodo https://zenodo.org/communities/dryad https://doi.org/10.5061/dryad.g1jwstqpj oai:zenodo.org:4086400 info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode info:eu-repo/semantics/other 2020 ftzenodo https://doi.org/10.5061/dryad.g1jwstqpj 2024-07-26T21:46:44Z The ability of a species to adapt to environmental change is ultimately reflected in its vital rates – i.e., survival and reproductive success of individuals. Together, vital rates determine trends in numbers, commonly monitored using counts of species abundance. Rapid changes in abundance can give rise to concern, leading to calls for research into the biological mechanisms underlying variations in demography. For the NW European population of Bewick's swan ( Cygnus columbianus bewickii ), there have been major changes in the population trends recorded during nearly five decades of monitoring (1970-2016). The total number of birds increased to a maximum of c. 30,000 in 1995 and subsequently decreased to about 18,000 individuals in 2010. Such large fluctuation in population numbers is rare in long-lived species and understanding the drivers of this population change is crucial for species management and conservation. Using the integrated population model (IPM) framework, we analysed three demographic datasets in combination: population counts, capture-mark-resightings (CMR) and the proportion of juveniles in winter over a period of ~50 years. We found higher apparent breeding success in the years when the population had a positive growth rate compared to years with a negative growth rate. Moreover, no consistent trend in adult and yearling survival, and an increasing trend in juvenile survival was found. A transient life-table response experiment showed that apparent breeding success and adult survival contributed most to the variation in population trend. We explored possible explanatory variables for the different demographic rates and found a significant association between juvenile survival both with the water level in lakes during autumn migration, which affects food accessibility for the swans, and with summer temperatures. Such associations are important for understanding the dynamics of species with fluctuating population sizes, and thus for informing management and conservation decisions. Funding ... Other/Unknown Material Cygnus columbianus Zenodo |
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The ability of a species to adapt to environmental change is ultimately reflected in its vital rates – i.e., survival and reproductive success of individuals. Together, vital rates determine trends in numbers, commonly monitored using counts of species abundance. Rapid changes in abundance can give rise to concern, leading to calls for research into the biological mechanisms underlying variations in demography. For the NW European population of Bewick's swan ( Cygnus columbianus bewickii ), there have been major changes in the population trends recorded during nearly five decades of monitoring (1970-2016). The total number of birds increased to a maximum of c. 30,000 in 1995 and subsequently decreased to about 18,000 individuals in 2010. Such large fluctuation in population numbers is rare in long-lived species and understanding the drivers of this population change is crucial for species management and conservation. Using the integrated population model (IPM) framework, we analysed three demographic datasets in combination: population counts, capture-mark-resightings (CMR) and the proportion of juveniles in winter over a period of ~50 years. We found higher apparent breeding success in the years when the population had a positive growth rate compared to years with a negative growth rate. Moreover, no consistent trend in adult and yearling survival, and an increasing trend in juvenile survival was found. A transient life-table response experiment showed that apparent breeding success and adult survival contributed most to the variation in population trend. We explored possible explanatory variables for the different demographic rates and found a significant association between juvenile survival both with the water level in lakes during autumn migration, which affects food accessibility for the swans, and with summer temperatures. Such associations are important for understanding the dynamics of species with fluctuating population sizes, and thus for informing management and conservation decisions. Funding ... |
format |
Other/Unknown Material |
author |
Nuijten, Rascha Vriend, Stefan Wood, Kevin Haitjema, Trinus Rees, Eileen Jongejans, Eelke Nolet, Bart |
spellingShingle |
Nuijten, Rascha Vriend, Stefan Wood, Kevin Haitjema, Trinus Rees, Eileen Jongejans, Eelke Nolet, Bart Apparent breeding success drives long-term population dynamics of a migratory swan |
author_facet |
Nuijten, Rascha Vriend, Stefan Wood, Kevin Haitjema, Trinus Rees, Eileen Jongejans, Eelke Nolet, Bart |
author_sort |
Nuijten, Rascha |
title |
Apparent breeding success drives long-term population dynamics of a migratory swan |
title_short |
Apparent breeding success drives long-term population dynamics of a migratory swan |
title_full |
Apparent breeding success drives long-term population dynamics of a migratory swan |
title_fullStr |
Apparent breeding success drives long-term population dynamics of a migratory swan |
title_full_unstemmed |
Apparent breeding success drives long-term population dynamics of a migratory swan |
title_sort |
apparent breeding success drives long-term population dynamics of a migratory swan |
publisher |
Zenodo |
publishDate |
2020 |
url |
https://doi.org/10.5061/dryad.g1jwstqpj |
genre |
Cygnus columbianus |
genre_facet |
Cygnus columbianus |
op_relation |
https://zenodo.org/communities/dryad https://doi.org/10.5061/dryad.g1jwstqpj oai:zenodo.org:4086400 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode |
op_doi |
https://doi.org/10.5061/dryad.g1jwstqpj |
_version_ |
1810440914038947840 |