Declining reproductive output in capercaillie and black grouse – 16 countries and 80 years
Declines in populations of capercaillie ( Tetrao urogallus ) and black grouse ( Lyrurus tetrix ) have been reported from both Central Europe and the continuous boreal forests of Fennoscandia. While intensified land-use is assumed to be the underlying cause of these declines, the mechanisms are not y...
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crbrillap:10.1163/15707563-00002514 2024-09-15T18:05:59+00:00 Declining reproductive output in capercaillie and black grouse – 16 countries and 80 years Jahren, Torfinn Storaas, Torstein Willebrand, Tomas Fossland Moa, Pål Hagen, Bjørn-Roar 2016 http://dx.doi.org/10.1163/15707563-00002514 https://brill.com/view/journals/ab/66/3-4/article-p363_11.xml https://brill.com/downloadpdf/journals/ab/66/3-4/article-p363_11.xml unknown Brill http://creativecommons.org/licenses/by-nc/4.0 Animal Biology volume 66, issue 3-4, page 363-400 ISSN 1570-7555 1570-7563 journal-article 2016 crbrillap https://doi.org/10.1163/15707563-00002514 2024-08-26T04:07:28Z Declines in populations of capercaillie ( Tetrao urogallus ) and black grouse ( Lyrurus tetrix ) have been reported from both Central Europe and the continuous boreal forests of Fennoscandia. While intensified land-use is assumed to be the underlying cause of these declines, the mechanisms are not yet understood. Predation is the proximate cause of mortality of eggs, chicks and adults throughout capercaillie and black grouse ranges, but the link between predation and habitat and/or climate change remains unclear. To investigate temporal trends in reproductive output of woodland grouse, we collated previously published and unpublished data of reproduction in capercaillie and black grouse throughout their ranges from 1930 to 2012. We show that, overall, reproductive success has decreased and stabilized at low levels in most regions whilst capercaillie reproductive output in Scotland is still declining. With today’s net reproduction, capercaillie and black grouse adult survival is too low to compensate for reproduction declines. Consequently, populations are expected to further decline unless reproductive performances improve. We put our findings in the context of changes in land use, climate and generalist predator numbers. By critically reviewing how these factors limit reproductive success in capercaillie and black grouse, we hope to shed light on the underlying mechanisms causing the decline. Our results imply that measures should be undertaken to reduce mortality of capercaillie and black grouse chicks and eggs. We suggest that future studies should aim to better understand which predators limit capercaillie and black grouse populations and how predation rates are mediated by continuously changing habitat and climate. Article in Journal/Newspaper Fennoscandia Brill Animal Biology 66 3-4 363 400 |
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Declines in populations of capercaillie ( Tetrao urogallus ) and black grouse ( Lyrurus tetrix ) have been reported from both Central Europe and the continuous boreal forests of Fennoscandia. While intensified land-use is assumed to be the underlying cause of these declines, the mechanisms are not yet understood. Predation is the proximate cause of mortality of eggs, chicks and adults throughout capercaillie and black grouse ranges, but the link between predation and habitat and/or climate change remains unclear. To investigate temporal trends in reproductive output of woodland grouse, we collated previously published and unpublished data of reproduction in capercaillie and black grouse throughout their ranges from 1930 to 2012. We show that, overall, reproductive success has decreased and stabilized at low levels in most regions whilst capercaillie reproductive output in Scotland is still declining. With today’s net reproduction, capercaillie and black grouse adult survival is too low to compensate for reproduction declines. Consequently, populations are expected to further decline unless reproductive performances improve. We put our findings in the context of changes in land use, climate and generalist predator numbers. By critically reviewing how these factors limit reproductive success in capercaillie and black grouse, we hope to shed light on the underlying mechanisms causing the decline. Our results imply that measures should be undertaken to reduce mortality of capercaillie and black grouse chicks and eggs. We suggest that future studies should aim to better understand which predators limit capercaillie and black grouse populations and how predation rates are mediated by continuously changing habitat and climate. |
format |
Article in Journal/Newspaper |
author |
Jahren, Torfinn Storaas, Torstein Willebrand, Tomas Fossland Moa, Pål Hagen, Bjørn-Roar |
spellingShingle |
Jahren, Torfinn Storaas, Torstein Willebrand, Tomas Fossland Moa, Pål Hagen, Bjørn-Roar Declining reproductive output in capercaillie and black grouse – 16 countries and 80 years |
author_facet |
Jahren, Torfinn Storaas, Torstein Willebrand, Tomas Fossland Moa, Pål Hagen, Bjørn-Roar |
author_sort |
Jahren, Torfinn |
title |
Declining reproductive output in capercaillie and black grouse – 16 countries and 80 years |
title_short |
Declining reproductive output in capercaillie and black grouse – 16 countries and 80 years |
title_full |
Declining reproductive output in capercaillie and black grouse – 16 countries and 80 years |
title_fullStr |
Declining reproductive output in capercaillie and black grouse – 16 countries and 80 years |
title_full_unstemmed |
Declining reproductive output in capercaillie and black grouse – 16 countries and 80 years |
title_sort |
declining reproductive output in capercaillie and black grouse – 16 countries and 80 years |
publisher |
Brill |
publishDate |
2016 |
url |
http://dx.doi.org/10.1163/15707563-00002514 https://brill.com/view/journals/ab/66/3-4/article-p363_11.xml https://brill.com/downloadpdf/journals/ab/66/3-4/article-p363_11.xml |
genre |
Fennoscandia |
genre_facet |
Fennoscandia |
op_source |
Animal Biology volume 66, issue 3-4, page 363-400 ISSN 1570-7555 1570-7563 |
op_rights |
http://creativecommons.org/licenses/by-nc/4.0 |
op_doi |
https://doi.org/10.1163/15707563-00002514 |
container_title |
Animal Biology |
container_volume |
66 |
container_issue |
3-4 |
container_start_page |
363 |
op_container_end_page |
400 |
_version_ |
1810443488655835136 |