Phenology, stopover dynamics and population size of migrating Black-tailed Godwits Limosa limosa limosa in Portuguese rice plantations
Between 2005/06 and 2008/09 we studied Black-tailed Godwits Limosa I. limosa staging in the rice fields surrounding the Tejo and Sado estuaries, Portugal. Godwits were counted weekly and flocks were scanned for colour-ringed individuals. We analysed phenology, dynamics of the stopover, and estimated...
Published in: | Ardea |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2010
|
Subjects: | |
Online Access: | https://hdl.handle.net/11370/70bd6824-8020-40a7-9d58-f773f5a9ad7d https://research.rug.nl/en/publications/70bd6824-8020-40a7-9d58-f773f5a9ad7d https://doi.org/10.5253/078.098.0105 https://pure.rug.nl/ws/files/6745714/2010ArdeaLourenco.pdf |
id |
ftunigroningenpu:oai:pure.rug.nl:publications/70bd6824-8020-40a7-9d58-f773f5a9ad7d |
---|---|
record_format |
openpolar |
spelling |
ftunigroningenpu:oai:pure.rug.nl:publications/70bd6824-8020-40a7-9d58-f773f5a9ad7d 2024-06-02T08:15:59+00:00 Phenology, stopover dynamics and population size of migrating Black-tailed Godwits Limosa limosa limosa in Portuguese rice plantations Lourenco, Pedro M. Kentie, Rosemarie Schroeder, Julia Alves, José A. Groen, Niko M. Hooijmeijer, Jos C.E.W. Piersma, Theunis 2010 application/pdf https://hdl.handle.net/11370/70bd6824-8020-40a7-9d58-f773f5a9ad7d https://research.rug.nl/en/publications/70bd6824-8020-40a7-9d58-f773f5a9ad7d https://doi.org/10.5253/078.098.0105 https://pure.rug.nl/ws/files/6745714/2010ArdeaLourenco.pdf eng eng https://research.rug.nl/en/publications/70bd6824-8020-40a7-9d58-f773f5a9ad7d info:eu-repo/semantics/openAccess Lourenco , P M , Kentie , R , Schroeder , J , Alves , J A , Groen , N M , Hooijmeijer , J C E W & Piersma , T 2010 , ' Phenology, stopover dynamics and population size of migrating Black-tailed Godwits Limosa limosa limosa in Portuguese rice plantations ' , Ardea , vol. 98 , no. 1 , pp. 35-42 . https://doi.org/10.5253/078.098.0105 Limosa limosa phenology population estimate rice fields staging area stopover duration BIRDS RECAPTURE MIGRANTS ECOLOGY FIELDS article 2010 ftunigroningenpu https://doi.org/10.5253/078.098.0105 2024-05-07T18:43:19Z Between 2005/06 and 2008/09 we studied Black-tailed Godwits Limosa I. limosa staging in the rice fields surrounding the Tejo and Sado estuaries, Portugal. Godwits were counted weekly and flocks were scanned for colour-ringed individuals. We analysed phenology, dynamics of the stopover, and estimated the size of the Portuguese staging population as well as the total western limosa population. Godwits started arriving in January. Numbers peaked in the second half of February, after which they quickly departed from the area. Comparison with previous records suggested that numbers have decreased since the early 1990s, and that godwits currently peak later than some 15 years ago. Individual staging durations averaged 22.6 days in 2007 and 25.3 days in 2009, and increased towards the end of the staging period. We estimated that a total 59 200 birds used the area in 2007 and 53 100 in 2009. Using estimates for the proportion of colour-ringed birds in the flocks, we estimated the population size of the western part of the L. I. limosa population at 133 151-140 722 birds. This is higher than previous estimates based on inventories of the breeding population, but accounts for the non-breeding segment of the population. Thus, we estimate that 38-44% of the NW European Black-tailed Godwit population stage in Portugal. It is argued that processes in Iberia are not likely to have contributed to the population decline as the area for rice cultivation has increased. Nevertheless, as godwits staging in Iberia are totally dependent on human-made habitats, changes in rice farming practices could have great impact on the total population size. Article in Journal/Newspaper black-tailed godwit Limosa limosa University of Groningen research database Ardea 98 1 35 42 |
institution |
Open Polar |
collection |
University of Groningen research database |
op_collection_id |
ftunigroningenpu |
language |
English |
topic |
Limosa limosa phenology population estimate rice fields staging area stopover duration BIRDS RECAPTURE MIGRANTS ECOLOGY FIELDS |
spellingShingle |
Limosa limosa phenology population estimate rice fields staging area stopover duration BIRDS RECAPTURE MIGRANTS ECOLOGY FIELDS Lourenco, Pedro M. Kentie, Rosemarie Schroeder, Julia Alves, José A. Groen, Niko M. Hooijmeijer, Jos C.E.W. Piersma, Theunis Phenology, stopover dynamics and population size of migrating Black-tailed Godwits Limosa limosa limosa in Portuguese rice plantations |
topic_facet |
Limosa limosa phenology population estimate rice fields staging area stopover duration BIRDS RECAPTURE MIGRANTS ECOLOGY FIELDS |
description |
Between 2005/06 and 2008/09 we studied Black-tailed Godwits Limosa I. limosa staging in the rice fields surrounding the Tejo and Sado estuaries, Portugal. Godwits were counted weekly and flocks were scanned for colour-ringed individuals. We analysed phenology, dynamics of the stopover, and estimated the size of the Portuguese staging population as well as the total western limosa population. Godwits started arriving in January. Numbers peaked in the second half of February, after which they quickly departed from the area. Comparison with previous records suggested that numbers have decreased since the early 1990s, and that godwits currently peak later than some 15 years ago. Individual staging durations averaged 22.6 days in 2007 and 25.3 days in 2009, and increased towards the end of the staging period. We estimated that a total 59 200 birds used the area in 2007 and 53 100 in 2009. Using estimates for the proportion of colour-ringed birds in the flocks, we estimated the population size of the western part of the L. I. limosa population at 133 151-140 722 birds. This is higher than previous estimates based on inventories of the breeding population, but accounts for the non-breeding segment of the population. Thus, we estimate that 38-44% of the NW European Black-tailed Godwit population stage in Portugal. It is argued that processes in Iberia are not likely to have contributed to the population decline as the area for rice cultivation has increased. Nevertheless, as godwits staging in Iberia are totally dependent on human-made habitats, changes in rice farming practices could have great impact on the total population size. |
format |
Article in Journal/Newspaper |
author |
Lourenco, Pedro M. Kentie, Rosemarie Schroeder, Julia Alves, José A. Groen, Niko M. Hooijmeijer, Jos C.E.W. Piersma, Theunis |
author_facet |
Lourenco, Pedro M. Kentie, Rosemarie Schroeder, Julia Alves, José A. Groen, Niko M. Hooijmeijer, Jos C.E.W. Piersma, Theunis |
author_sort |
Lourenco, Pedro M. |
title |
Phenology, stopover dynamics and population size of migrating Black-tailed Godwits Limosa limosa limosa in Portuguese rice plantations |
title_short |
Phenology, stopover dynamics and population size of migrating Black-tailed Godwits Limosa limosa limosa in Portuguese rice plantations |
title_full |
Phenology, stopover dynamics and population size of migrating Black-tailed Godwits Limosa limosa limosa in Portuguese rice plantations |
title_fullStr |
Phenology, stopover dynamics and population size of migrating Black-tailed Godwits Limosa limosa limosa in Portuguese rice plantations |
title_full_unstemmed |
Phenology, stopover dynamics and population size of migrating Black-tailed Godwits Limosa limosa limosa in Portuguese rice plantations |
title_sort |
phenology, stopover dynamics and population size of migrating black-tailed godwits limosa limosa limosa in portuguese rice plantations |
publishDate |
2010 |
url |
https://hdl.handle.net/11370/70bd6824-8020-40a7-9d58-f773f5a9ad7d https://research.rug.nl/en/publications/70bd6824-8020-40a7-9d58-f773f5a9ad7d https://doi.org/10.5253/078.098.0105 https://pure.rug.nl/ws/files/6745714/2010ArdeaLourenco.pdf |
genre |
black-tailed godwit Limosa limosa |
genre_facet |
black-tailed godwit Limosa limosa |
op_source |
Lourenco , P M , Kentie , R , Schroeder , J , Alves , J A , Groen , N M , Hooijmeijer , J C E W & Piersma , T 2010 , ' Phenology, stopover dynamics and population size of migrating Black-tailed Godwits Limosa limosa limosa in Portuguese rice plantations ' , Ardea , vol. 98 , no. 1 , pp. 35-42 . https://doi.org/10.5253/078.098.0105 |
op_relation |
https://research.rug.nl/en/publications/70bd6824-8020-40a7-9d58-f773f5a9ad7d |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5253/078.098.0105 |
container_title |
Ardea |
container_volume |
98 |
container_issue |
1 |
container_start_page |
35 |
op_container_end_page |
42 |
_version_ |
1800740323323805696 |