Reduced breeding success of Pied Flycatchers Ficedula hypoleuca along regulated rivers
Most large rivers in northern Sweden are regulated to produce hydropower, with subsequent effects on flow dynamics and aquatic insect communities. Several studies have shown that aquatic and terrestrial systems are intimately connected via the export of emergent aquatic insects, but few have assesse...
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crwiley:10.1111/ibi.12024 2024-06-02T08:12:09+00:00 Reduced breeding success of Pied Flycatchers Ficedula hypoleuca along regulated rivers Strasevicius, Darius Jonsson, Micael Nyholm, N. Erik I. Malmqvist, Björn Browne, Stephen 2013 http://dx.doi.org/10.1111/ibi.12024 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fibi.12024 https://onlinelibrary.wiley.com/doi/pdf/10.1111/ibi.12024 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Ibis volume 155, issue 2, page 348-356 ISSN 0019-1019 1474-919X journal-article 2013 crwiley https://doi.org/10.1111/ibi.12024 2024-05-03T11:27:23Z Most large rivers in northern Sweden are regulated to produce hydropower, with subsequent effects on flow dynamics and aquatic insect communities. Several studies have shown that aquatic and terrestrial systems are intimately connected via the export of emergent aquatic insects, but few have assessed how human modifications of aquatic habitats may influence this connection. We compared breeding success of the insectivorous P ied F lycatcher F icedula hypoleuca in near‐riparian upland forests along two regulated and two free‐flowing large rivers in northern Sweden over 3 years. The regulated rivers showed lower aquatic insect export to the surroundings, as a consequence of regulation‐induced loss of suitable aquatic insect habitats. Survival of Pied Flycatcher nestlings was 10–15% greater along the free‐flowing rivers. Females breeding near the free‐flowing rivers also started egg‐laying earlier and with greater synchrony than those at the regulated rivers, and showed a smaller decrease in weight during breeding than did females along the regulated rivers. However, there were no differences in occupation rate, clutch size or number of successfully hatched juveniles between regulated and free‐flowing rivers. As regulated rivers showed lower abundance of flying aquatic insects, which may also reduce the abundance of terrestrial invertebrate prey, regulation‐induced changes in the export of emergent aquatic insects may explain both directly and indirectly the observed reduction in Pied Flycatcher breeding success along regulated rivers. Large‐scale river regulation may therefore impair the breeding success of insectivorous birds through impacts on prey availability. Article in Journal/Newspaper Northern Sweden Wiley Online Library Ibis 155 2 348 356 |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Most large rivers in northern Sweden are regulated to produce hydropower, with subsequent effects on flow dynamics and aquatic insect communities. Several studies have shown that aquatic and terrestrial systems are intimately connected via the export of emergent aquatic insects, but few have assessed how human modifications of aquatic habitats may influence this connection. We compared breeding success of the insectivorous P ied F lycatcher F icedula hypoleuca in near‐riparian upland forests along two regulated and two free‐flowing large rivers in northern Sweden over 3 years. The regulated rivers showed lower aquatic insect export to the surroundings, as a consequence of regulation‐induced loss of suitable aquatic insect habitats. Survival of Pied Flycatcher nestlings was 10–15% greater along the free‐flowing rivers. Females breeding near the free‐flowing rivers also started egg‐laying earlier and with greater synchrony than those at the regulated rivers, and showed a smaller decrease in weight during breeding than did females along the regulated rivers. However, there were no differences in occupation rate, clutch size or number of successfully hatched juveniles between regulated and free‐flowing rivers. As regulated rivers showed lower abundance of flying aquatic insects, which may also reduce the abundance of terrestrial invertebrate prey, regulation‐induced changes in the export of emergent aquatic insects may explain both directly and indirectly the observed reduction in Pied Flycatcher breeding success along regulated rivers. Large‐scale river regulation may therefore impair the breeding success of insectivorous birds through impacts on prey availability. |
author2 |
Browne, Stephen |
format |
Article in Journal/Newspaper |
author |
Strasevicius, Darius Jonsson, Micael Nyholm, N. Erik I. Malmqvist, Björn |
spellingShingle |
Strasevicius, Darius Jonsson, Micael Nyholm, N. Erik I. Malmqvist, Björn Reduced breeding success of Pied Flycatchers Ficedula hypoleuca along regulated rivers |
author_facet |
Strasevicius, Darius Jonsson, Micael Nyholm, N. Erik I. Malmqvist, Björn |
author_sort |
Strasevicius, Darius |
title |
Reduced breeding success of Pied Flycatchers Ficedula hypoleuca along regulated rivers |
title_short |
Reduced breeding success of Pied Flycatchers Ficedula hypoleuca along regulated rivers |
title_full |
Reduced breeding success of Pied Flycatchers Ficedula hypoleuca along regulated rivers |
title_fullStr |
Reduced breeding success of Pied Flycatchers Ficedula hypoleuca along regulated rivers |
title_full_unstemmed |
Reduced breeding success of Pied Flycatchers Ficedula hypoleuca along regulated rivers |
title_sort |
reduced breeding success of pied flycatchers ficedula hypoleuca along regulated rivers |
publisher |
Wiley |
publishDate |
2013 |
url |
http://dx.doi.org/10.1111/ibi.12024 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fibi.12024 https://onlinelibrary.wiley.com/doi/pdf/10.1111/ibi.12024 |
genre |
Northern Sweden |
genre_facet |
Northern Sweden |
op_source |
Ibis volume 155, issue 2, page 348-356 ISSN 0019-1019 1474-919X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/ibi.12024 |
container_title |
Ibis |
container_volume |
155 |
container_issue |
2 |
container_start_page |
348 |
op_container_end_page |
356 |
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1800758503535542272 |