Connecting foraging and roosting areas reveals how food stocks explain shorebird numbers
نویسندگان
چکیده
Shorebird populations, especially those feeding on shellfish, have strongly declined in recent decades and identifying the drivers of these declines is important for conservation. Changing food stocks are thought to be a key driver may also explain why trends not been uniform across Europe's largest estuary. We therefore investigated how winter population Eurasian oystercatchers (Haematopus ostralegus) were linked availability Dutch Wadden Sea. Our analysis incorporated two spatial scales, smaller scale focused roost counting areas available birds larger tidal basins. A novelty our study that we quantify connectivity between roosting foraging areas, identified from GPS tracking data. This allowed us estimate thus local trends. At there was no clear relationship number oystercatchers, indicating other factors drive fluctuations at finer scales. basins, however, significant food, cockle Cerastoderma edule,. Mortality recruitment alone could account large bird counts, suggesting site choice wintering migratory primarily fluctuations. Furthermore, oystercatcher abundance benthic stocks, suggests shorebird counts act as ecological indicators ecosystem health, informing about status
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ژورنال
عنوان ژورنال: Estuarine Coastal and Shelf Science
سال: 2021
ISSN: ['1096-0015', '0272-7714']
DOI: https://doi.org/10.1016/j.ecss.2021.107458