Long-term decline in breeding abundance of Black-headed Gull (Chroicocephalus ridibundus) in the Czech Republic: a case study of a population trend at the Chomoutov lake
Abstract The aim of this paper is to evaluate the long-term trend in breeding abundance of Black-headed Gull (Chroicocephalus ridibundus) at the Chomoutov lake, Czech Republic. In the period 1978-2014 (always between April 22 and May 10), we conducted 14 nest counts in the bird colony using the dire...
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Language: | English |
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Online Access: | http://dx.doi.org/10.1515/eko-2016-0028 https://content.sciendo.com/view/journals/eko/35/4/article-p350.xml https://www.sciendo.com/article/10.1515/eko-2016-0028 |
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crdegruyter:10.1515/eko-2016-0028 2023-05-15T18:49:32+02:00 Long-term decline in breeding abundance of Black-headed Gull (Chroicocephalus ridibundus) in the Czech Republic: a case study of a population trend at the Chomoutov lake Poprach, Karel Machar, Ivo Maton, Karel 2016 http://dx.doi.org/10.1515/eko-2016-0028 https://content.sciendo.com/view/journals/eko/35/4/article-p350.xml https://www.sciendo.com/article/10.1515/eko-2016-0028 en eng Walter de Gruyter GmbH http://creativecommons.org/licenses/by-nc-nd/4.0 CC-BY-NC-ND Ekológia (Bratislava) volume 35, issue 4, page 350-358 ISSN 1337-947X Ecology journal-article 2016 crdegruyter https://doi.org/10.1515/eko-2016-0028 2022-04-14T05:06:36Z Abstract The aim of this paper is to evaluate the long-term trend in breeding abundance of Black-headed Gull (Chroicocephalus ridibundus) at the Chomoutov lake, Czech Republic. In the period 1978-2014 (always between April 22 and May 10), we conducted 14 nest counts in the bird colony using the direct nest search method. In total, we counted 57,860 nests, from which 2,174 nests were found in the initial year 1978, the maximum number of nests (8,371) in 1993 and 3,304 nests in the last counting year 2014. The nests were located on the ground on an island elevated 2-3 m above the water level. In 1997, we found an unusually located nest on a nesting pad in a poplar tree (Populus sp.), 821 cm above the water level. In this paper, we point out the long-term decline in breeding abundance of Black-headed Gull in major breeding colonies in the Czech Republic, where the abundance declined by up to 95%, while numerous colonies have vanished completely. We discuss factors influencing the negative population trend of Black-headed Gull on the monitored site and in the entire Czech Republic. Article in Journal/Newspaper Black-headed Gull Chroicocephalus ridibundus De Gruyter (via Crossref) Ekológia (Bratislava) 35 4 350 358 |
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De Gruyter (via Crossref) |
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English |
topic |
Ecology |
spellingShingle |
Ecology Poprach, Karel Machar, Ivo Maton, Karel Long-term decline in breeding abundance of Black-headed Gull (Chroicocephalus ridibundus) in the Czech Republic: a case study of a population trend at the Chomoutov lake |
topic_facet |
Ecology |
description |
Abstract The aim of this paper is to evaluate the long-term trend in breeding abundance of Black-headed Gull (Chroicocephalus ridibundus) at the Chomoutov lake, Czech Republic. In the period 1978-2014 (always between April 22 and May 10), we conducted 14 nest counts in the bird colony using the direct nest search method. In total, we counted 57,860 nests, from which 2,174 nests were found in the initial year 1978, the maximum number of nests (8,371) in 1993 and 3,304 nests in the last counting year 2014. The nests were located on the ground on an island elevated 2-3 m above the water level. In 1997, we found an unusually located nest on a nesting pad in a poplar tree (Populus sp.), 821 cm above the water level. In this paper, we point out the long-term decline in breeding abundance of Black-headed Gull in major breeding colonies in the Czech Republic, where the abundance declined by up to 95%, while numerous colonies have vanished completely. We discuss factors influencing the negative population trend of Black-headed Gull on the monitored site and in the entire Czech Republic. |
format |
Article in Journal/Newspaper |
author |
Poprach, Karel Machar, Ivo Maton, Karel |
author_facet |
Poprach, Karel Machar, Ivo Maton, Karel |
author_sort |
Poprach, Karel |
title |
Long-term decline in breeding abundance of Black-headed Gull (Chroicocephalus ridibundus) in the Czech Republic: a case study of a population trend at the Chomoutov lake |
title_short |
Long-term decline in breeding abundance of Black-headed Gull (Chroicocephalus ridibundus) in the Czech Republic: a case study of a population trend at the Chomoutov lake |
title_full |
Long-term decline in breeding abundance of Black-headed Gull (Chroicocephalus ridibundus) in the Czech Republic: a case study of a population trend at the Chomoutov lake |
title_fullStr |
Long-term decline in breeding abundance of Black-headed Gull (Chroicocephalus ridibundus) in the Czech Republic: a case study of a population trend at the Chomoutov lake |
title_full_unstemmed |
Long-term decline in breeding abundance of Black-headed Gull (Chroicocephalus ridibundus) in the Czech Republic: a case study of a population trend at the Chomoutov lake |
title_sort |
long-term decline in breeding abundance of black-headed gull (chroicocephalus ridibundus) in the czech republic: a case study of a population trend at the chomoutov lake |
publisher |
Walter de Gruyter GmbH |
publishDate |
2016 |
url |
http://dx.doi.org/10.1515/eko-2016-0028 https://content.sciendo.com/view/journals/eko/35/4/article-p350.xml https://www.sciendo.com/article/10.1515/eko-2016-0028 |
genre |
Black-headed Gull Chroicocephalus ridibundus |
genre_facet |
Black-headed Gull Chroicocephalus ridibundus |
op_source |
Ekológia (Bratislava) volume 35, issue 4, page 350-358 ISSN 1337-947X |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/4.0 |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1515/eko-2016-0028 |
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Ekológia (Bratislava) |
container_volume |
35 |
container_issue |
4 |
container_start_page |
350 |
op_container_end_page |
358 |
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