Seasonal survival and migratory connectivity of the Eurasian Oystercatcher revealed by citizen science

Allen, Andrew, Ens, Bruno J., van de Pol, Martijn, Van Der Jeugd, Henk, Frauendorf, Magali, Oosterbeek, Kees, and Jongejans, Eelke (2019) Seasonal survival and migratory connectivity of the Eurasian Oystercatcher revealed by citizen science. Auk, 136 (1). pp. 1-17.

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Migratory connectivity describes linkages between breeding and non-breeding areas. An ongoing challenge is tracking avian species between breeding and non-breeding areas and hence estimating migratory connectivity and seasonal survival. Collaborative color-ringing projects between researchers and citizen scientists provide opportunities for tracking the annual movements of avian species. Our study describes seasonal survival and migratory connectivity using data from more than 4,600 individuals with over 51,000 observations, predominantly collected by citizen scientists. Our study focuses on the Eurasian Oystercatcher (Haematopus ostralegus), a species that has experienced a substantial and ongoing decline in recent decades. Multiple threats have been described, and given that these threats vary in space and time, there is an urgent need to estimate demographic rates at the appropriate spatio-temporal scale. We performed a seasonal multi-state (5 geographical areas within The Netherlands) live- and dead-recoveries analysis under varying model structures to account for biological and data complexity. Coastal breeding populations were largely sedentary, while inland breeding populations were migratory and the direction of migration varied among areas, which has not been described previously. Our results indicated that survival was lower during winter than summer and that survival was lower in inland areas compared with coastal areas. A concerning result was that seasonal survival of individuals over-wintering in the Wadden Sea, an internationally important site for over-wintering shorebirds, appeared to decline during the study period. We discuss the outcomes of our study, and how citizen science was integral for conducting this study. Our findings identify how the demographic rates of the oystercatcher vary in space and time, knowledge that is vital for generating hypotheses and prioritizing future research into the causes of decline.

Item ID: 69634
Item Type: Article (Research - C1)
ISSN: 2732-4613
Keywords: burgerwetenschap, citizen science, meervoudige toestanden, migratory connectivity, multi-state, partial migration, program mark, programma MARK, seasonal survival, seizoensoverleving, trekwegverbindingen
Copyright Information: © American Ornithological Society 2019. All rights reserved. For permissions, e-mail: This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model.
Date Deposited: 14 Oct 2021 00:02
FoR Codes: 31 BIOLOGICAL SCIENCES > 3103 Ecology > 310307 Population ecology @ 100%
SEO Codes: 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280102 Expanding knowledge in the biological sciences @ 100%
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