Spatial and temporal variation in demography of a house sparrow metapopulation
1. In order to compare spatial and temporal variation in the demography of a metapopulation of house sparrows living on four islands off the coast of Northern Norway, we computed the asymptotic population growth rate (λ) for three transitions between years, using a projection matrix model. 2. The me...
Published in: | Journal of Animal Ecology |
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Wiley
1999
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Online Access: | http://dx.doi.org/10.1046/j.1365-2656.1999.00314.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-2656.1999.00314.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-2656.1999.00314.x https://onlinelibrary.wiley.com/doi/full-xml/10.1046/j.1365-2656.1999.00314.x https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-2656.1999.00314.x |
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crwiley:10.1046/j.1365-2656.1999.00314.x 2024-09-09T19:59:32+00:00 Spatial and temporal variation in demography of a house sparrow metapopulation Saether, Bernt‐Erik Ringsby, Thor Harald Bakke, Øyvind Solberg, Erling Johan 1999 http://dx.doi.org/10.1046/j.1365-2656.1999.00314.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-2656.1999.00314.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-2656.1999.00314.x https://onlinelibrary.wiley.com/doi/full-xml/10.1046/j.1365-2656.1999.00314.x https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-2656.1999.00314.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Animal Ecology volume 68, issue 3, page 628-637 ISSN 0021-8790 1365-2656 journal-article 1999 crwiley https://doi.org/10.1046/j.1365-2656.1999.00314.x 2024-07-02T04:10:03Z 1. In order to compare spatial and temporal variation in the demography of a metapopulation of house sparrows living on four islands off the coast of Northern Norway, we computed the asymptotic population growth rate (λ) for three transitions between years, using a projection matrix model. 2. The mean growth rate of the metapopulation was positive (λ = 1·05). 3. Large variation was found in space and time in the asymptotic growth rate. Even though the standard deviations of the estimates were large, λ was significantly greater than 1 on one island in 2 out of 3 years. In contrast, λ significantly less than 1 occurred on an island on five occasions. 4. Decomposition of the magnitude of the spatial and temporal components of λ showed that one year (1995) had a particularly negative impact on λ. In contrast, one island had a great positive effect. 5. These differences in λ were most closely related to variation in the juvenile survival rate and in the fecundity rate, which, in turn, was closely related to variation both in space and time in the proportion of the eggs that produced a fledgling. 6. As expected from the large spatio‐temporal variation in λ, the sensitivities and the elasticities of λ to variation in the different elements in the projection‐matrix also differed both in space and time. When λ was small, it was most influenced by variation in adult survival rate. In contrast, for large λ, it was most sensitive to variation in the recruitment rate. 7. We suggest that conditions during the breeding season determine whether a population acts as a source or sink in this temperate small passerine metapopulation, and that the ratio of juveniles to adults can be used to characterize populations as sources or sinks. 8. These results demonstrate large variation in space and time in the demography of a small passerine metapopulation. These differences result from a combination of regional effects on the whole metapopulation, and factors that occur at one particular island in a single year. Article in Journal/Newspaper Northern Norway Wiley Online Library Four Islands ENVELOPE(-108.218,-108.218,56.050,56.050) Norway Journal of Animal Ecology 68 3 628 637 |
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Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
description |
1. In order to compare spatial and temporal variation in the demography of a metapopulation of house sparrows living on four islands off the coast of Northern Norway, we computed the asymptotic population growth rate (λ) for three transitions between years, using a projection matrix model. 2. The mean growth rate of the metapopulation was positive (λ = 1·05). 3. Large variation was found in space and time in the asymptotic growth rate. Even though the standard deviations of the estimates were large, λ was significantly greater than 1 on one island in 2 out of 3 years. In contrast, λ significantly less than 1 occurred on an island on five occasions. 4. Decomposition of the magnitude of the spatial and temporal components of λ showed that one year (1995) had a particularly negative impact on λ. In contrast, one island had a great positive effect. 5. These differences in λ were most closely related to variation in the juvenile survival rate and in the fecundity rate, which, in turn, was closely related to variation both in space and time in the proportion of the eggs that produced a fledgling. 6. As expected from the large spatio‐temporal variation in λ, the sensitivities and the elasticities of λ to variation in the different elements in the projection‐matrix also differed both in space and time. When λ was small, it was most influenced by variation in adult survival rate. In contrast, for large λ, it was most sensitive to variation in the recruitment rate. 7. We suggest that conditions during the breeding season determine whether a population acts as a source or sink in this temperate small passerine metapopulation, and that the ratio of juveniles to adults can be used to characterize populations as sources or sinks. 8. These results demonstrate large variation in space and time in the demography of a small passerine metapopulation. These differences result from a combination of regional effects on the whole metapopulation, and factors that occur at one particular island in a single year. |
format |
Article in Journal/Newspaper |
author |
Saether, Bernt‐Erik Ringsby, Thor Harald Bakke, Øyvind Solberg, Erling Johan |
spellingShingle |
Saether, Bernt‐Erik Ringsby, Thor Harald Bakke, Øyvind Solberg, Erling Johan Spatial and temporal variation in demography of a house sparrow metapopulation |
author_facet |
Saether, Bernt‐Erik Ringsby, Thor Harald Bakke, Øyvind Solberg, Erling Johan |
author_sort |
Saether, Bernt‐Erik |
title |
Spatial and temporal variation in demography of a house sparrow metapopulation |
title_short |
Spatial and temporal variation in demography of a house sparrow metapopulation |
title_full |
Spatial and temporal variation in demography of a house sparrow metapopulation |
title_fullStr |
Spatial and temporal variation in demography of a house sparrow metapopulation |
title_full_unstemmed |
Spatial and temporal variation in demography of a house sparrow metapopulation |
title_sort |
spatial and temporal variation in demography of a house sparrow metapopulation |
publisher |
Wiley |
publishDate |
1999 |
url |
http://dx.doi.org/10.1046/j.1365-2656.1999.00314.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-2656.1999.00314.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-2656.1999.00314.x https://onlinelibrary.wiley.com/doi/full-xml/10.1046/j.1365-2656.1999.00314.x https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-2656.1999.00314.x |
long_lat |
ENVELOPE(-108.218,-108.218,56.050,56.050) |
geographic |
Four Islands Norway |
geographic_facet |
Four Islands Norway |
genre |
Northern Norway |
genre_facet |
Northern Norway |
op_source |
Journal of Animal Ecology volume 68, issue 3, page 628-637 ISSN 0021-8790 1365-2656 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1046/j.1365-2656.1999.00314.x |
container_title |
Journal of Animal Ecology |
container_volume |
68 |
container_issue |
3 |
container_start_page |
628 |
op_container_end_page |
637 |
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1809930638854193152 |