Agroecosystems and conservation of migratory waterbirds: importance of coastal pastures and factors influencing their use by wintering shorebirds
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- 作者：Juan G. Navedo (1)
David Arranz (2)
Alejandro G. Herrera (2)
Pablo Salmón (2)
José A. Juanes (3)
José A. Masero (1) - 关键词：Curlews ; Disturbances ; Godwits ; Harvesting ; Shellfishing ; Supplementary foraging
- 刊名：Biodiversity and Conservation
- 出版年：2013
- 出版时间：August 2013
- 年：2013
- 卷：22
- 期：9
- 页码：1895-1907
- 全文大小：337KB
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David Arranz (2)
Alejandro G. Herrera (2)
Pablo Salmón (2)
José A. Juanes (3)
José A. Masero (1)
1. Conservation Biology Research Group, Department of Zoology, University of Extremadura, 06006, Badajoz, Spain
2. Aves Cantábricas SL., Plaza de los Valles 10, 39300, Torrelavega, Cantabria, Spain
3. Environmental Hydraulics Institute ‘IH Cantabria- University of Cantabria, Santander, Spain
文摘
Coastal pastures are common agroecosystems adjacent to estuarine areas that can provide valuable habitat for wildlife, particularly for migratory shorebirds. Disentangling the factors that influence coastal pasture use by wintering shorebirds will provide new insights into its role for buffering human disturbances and habitat loss in intertidal areas. We examined whether numbers of two shorebirds (Eurasian curlew and Black-tailed godwit) foraging actively on coastal pastures was affected by weather conditions, tidal stage (low/high tide) and number of harvesters at intertidal areas throughout winter. Both species frequently used coastal pastures and most individuals foraged actively there. The average percentage of the total wintering population of curlews and godwits foraging on coastal pastures was 27.4 and 7.8?%, respectively, and was significantly higher during high tide compared to low tide. The number of harvesters on mudflats also had a positive significant effect in explaining the presence of curlews, and to a lesser extent for godwits, on coastal pastures, and accumulated rainfall had a positive effect for both species too. These supratidal areas were consistently used as alternative foraging grounds during low tide by curlews, as well as supplementary foraging areas during high tide by wintering populations of both large shorebirds. By supplementary foraging, wintering curlews, and probably godwits, seemed to compensate for a negative effect of the presence of harvesters on their foraging activity. We recommend managing of those coastal agricultural fields adjacent to intertidal foraging grounds in order to increase the availability of supratidal foraging habitats for declining shorebird populations. These habitats may thus have a beneficial role in sustaining populations of wintering shorebirds, but further studies are needed to estimate if birds can compensate for any shortfall in daily energy budget by supplementary foraging on coastal pastures, thus providing insights into whether they are involved in large-scale population regulation of migratory birds.