Population fluctuations and regulation in great snipe : a time-series analysis
1. During the last centuries, the breeding range of the great snipe Gallinago media has declined dramatically in the western part of its distribution. To examine present population dynamics in the Scandinavian mountains, we collected and analysed a 19-year time series of counts of great snipe males...
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ftubkonstanz:oai:kops.uni-konstanz.de:123456789/47709 2024-02-11T10:03:58+01:00 Population fluctuations and regulation in great snipe : a time-series analysis Kölzsch, Andrea Saether, Stein Are Gustafsson, Henrik Fiske, Peder Höglund, Jacob Kålås, John Atle 2007 application/pdf http://nbn-resolving.de/urn:nbn:de:bsz:352-2-k4x2v7n0hy4s6 https://doi.org/10.1111/j.1365-2656.2007.01246.x eng eng http://nbn-resolving.de/urn:nbn:de:bsz:352-2-k4x2v7n0hy4s6 http://dx.doi.org/10.1111/j.1365-2656.2007.01246.x 17584380 1684181380 https://rightsstatements.org/page/InC/1.0/ Journal of Animal Ecology. 2007, 76(4), pp. 740-749. ISSN 0021-8790. eISSN 1365-2656. Available under: doi:10.1111/j.1365-2656.2007.01246.x density dependence environmental covariates Gallinago media Parametric Bootstrap Likelihood Ratio test population dynamics ddc:570 doc-type:article doc-type:Text 2007 ftubkonstanz https://doi.org/10.1111/j.1365-2656.2007.01246.x 2024-01-21T23:57:57Z 1. During the last centuries, the breeding range of the great snipe Gallinago media has declined dramatically in the western part of its distribution. To examine present population dynamics in the Scandinavian mountains, we collected and analysed a 19-year time series of counts of great snipe males at leks in central Norway, 1987-2005. 2. The population showed large annual fluctuations in the number of males displaying at lek sites (range 45-90 males at the peak of the mating season), but no overall trend. 3. We detected presence of direct density-dependent mechanisms regulating this population. Inclusion of the density-dependent term in a Ricker-type model significantly improved the fit with observed data (evaluated with Parametric Bootstrap Likelihood Ratio tests and Akaike's Information Criterion for small sample size). 4. An analysis of (a number of a priori likely) environmental covariates suggests that the population dynamics were affected by conditions influencing reproduction and survival of offspring during the summer, but not by conditions influencing survival at the wintering grounds in Africa. This is in contrast to many altricial birds breeding in the northern hemisphere, and supports the idea that population dynamics of migratory nidifugous birds are more influenced by conditions during reproduction. 5. Inclusion of these external factors into our model improved the detectability of density dependence. This illustrates that allowing for external effects may increase statistical power of density dependence tests and thus be of particular importance in relatively short time series. 6. In our best model of the population dynamics, two likely density-independent offspring survival covariates explained 47.3% of the variance in great snipe numbers (predation pressure estimated by willow grouse reproductive success and food availability estimated by the amount of precipitation in June), whereas density dependence explained 35.5%. Demographic stochasticity and unidentified environmental stochasticity may ... Article in Journal/Newspaper Gallinago media great snipe KOPS - The Institutional Repository of the University of Konstanz Norway Journal of Animal Ecology 76 4 740 749 |
institution |
Open Polar |
collection |
KOPS - The Institutional Repository of the University of Konstanz |
op_collection_id |
ftubkonstanz |
language |
English |
topic |
density dependence environmental covariates Gallinago media Parametric Bootstrap Likelihood Ratio test population dynamics ddc:570 |
spellingShingle |
density dependence environmental covariates Gallinago media Parametric Bootstrap Likelihood Ratio test population dynamics ddc:570 Kölzsch, Andrea Saether, Stein Are Gustafsson, Henrik Fiske, Peder Höglund, Jacob Kålås, John Atle Population fluctuations and regulation in great snipe : a time-series analysis |
topic_facet |
density dependence environmental covariates Gallinago media Parametric Bootstrap Likelihood Ratio test population dynamics ddc:570 |
description |
1. During the last centuries, the breeding range of the great snipe Gallinago media has declined dramatically in the western part of its distribution. To examine present population dynamics in the Scandinavian mountains, we collected and analysed a 19-year time series of counts of great snipe males at leks in central Norway, 1987-2005. 2. The population showed large annual fluctuations in the number of males displaying at lek sites (range 45-90 males at the peak of the mating season), but no overall trend. 3. We detected presence of direct density-dependent mechanisms regulating this population. Inclusion of the density-dependent term in a Ricker-type model significantly improved the fit with observed data (evaluated with Parametric Bootstrap Likelihood Ratio tests and Akaike's Information Criterion for small sample size). 4. An analysis of (a number of a priori likely) environmental covariates suggests that the population dynamics were affected by conditions influencing reproduction and survival of offspring during the summer, but not by conditions influencing survival at the wintering grounds in Africa. This is in contrast to many altricial birds breeding in the northern hemisphere, and supports the idea that population dynamics of migratory nidifugous birds are more influenced by conditions during reproduction. 5. Inclusion of these external factors into our model improved the detectability of density dependence. This illustrates that allowing for external effects may increase statistical power of density dependence tests and thus be of particular importance in relatively short time series. 6. In our best model of the population dynamics, two likely density-independent offspring survival covariates explained 47.3% of the variance in great snipe numbers (predation pressure estimated by willow grouse reproductive success and food availability estimated by the amount of precipitation in June), whereas density dependence explained 35.5%. Demographic stochasticity and unidentified environmental stochasticity may ... |
format |
Article in Journal/Newspaper |
author |
Kölzsch, Andrea Saether, Stein Are Gustafsson, Henrik Fiske, Peder Höglund, Jacob Kålås, John Atle |
author_facet |
Kölzsch, Andrea Saether, Stein Are Gustafsson, Henrik Fiske, Peder Höglund, Jacob Kålås, John Atle |
author_sort |
Kölzsch, Andrea |
title |
Population fluctuations and regulation in great snipe : a time-series analysis |
title_short |
Population fluctuations and regulation in great snipe : a time-series analysis |
title_full |
Population fluctuations and regulation in great snipe : a time-series analysis |
title_fullStr |
Population fluctuations and regulation in great snipe : a time-series analysis |
title_full_unstemmed |
Population fluctuations and regulation in great snipe : a time-series analysis |
title_sort |
population fluctuations and regulation in great snipe : a time-series analysis |
publishDate |
2007 |
url |
http://nbn-resolving.de/urn:nbn:de:bsz:352-2-k4x2v7n0hy4s6 https://doi.org/10.1111/j.1365-2656.2007.01246.x |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Gallinago media great snipe |
genre_facet |
Gallinago media great snipe |
op_source |
Journal of Animal Ecology. 2007, 76(4), pp. 740-749. ISSN 0021-8790. eISSN 1365-2656. Available under: doi:10.1111/j.1365-2656.2007.01246.x |
op_relation |
http://nbn-resolving.de/urn:nbn:de:bsz:352-2-k4x2v7n0hy4s6 http://dx.doi.org/10.1111/j.1365-2656.2007.01246.x 17584380 1684181380 |
op_rights |
https://rightsstatements.org/page/InC/1.0/ |
op_doi |
https://doi.org/10.1111/j.1365-2656.2007.01246.x |
container_title |
Journal of Animal Ecology |
container_volume |
76 |
container_issue |
4 |
container_start_page |
740 |
op_container_end_page |
749 |
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1790600367068676096 |