caa a22 4500 606164820 CHVBK 20210128100650.0 cr unu---uuuuu 210128e20151001xx s 000 0 eng 10.1007/s10144-015-0511-4 doi (NATIONALLICENCE)springer-10.1007/s10144-015-0511-4 Apparent annual survival of staging ruffs during a period of population decline: insights from sex and site-use related differences [Elektronische Daten] [Lucie Schmaltz, Cédric Juillet, Joost Tinbergen, Yvonne Verkuil, Joslyn Hooijmeijer, Theunis Piersma] The ruff Philomachus pugnax, a lekking shorebird wintering in Africa and breeding across northern Eurasia, declined severely in its western range. Based on a capture-mark-resighting programme (2004-2011) in the westernmost staging area in Friesland (the Netherlands), we investigated changes in apparent annual survival in relation to age and sex to explore potential causes of decline. We also related temporal variation in apparent survival to environmental factors. We used the Capture-Mark-Recapture multievent statistical framework to overcome biases in survival estimates after testing for hidden heterogeneity of detection. This enabled the estimation of the probability to belong to high or low detectability classes. Apparent survival varied between years but was not related to weather patterns along the flyway, or to flood levels in the Sahel. Over time, a decline in apparent survival is suggested. Due to a short data series and flag loss in the last period this cannot be verified. Nevertheless, the patterns in sex-specific detectability and survival lead to new biological insights. Among highly detectable birds, supposedly most reliant on Friesland, males survived better than females ( $$\bar{\phi }_{\text{HD males}}$$ ϕ ¯ HD males =0.74, range 0.51-0.93; $$\bar{\phi }_{\text{HD females}}$$ ϕ ¯ HD females =0.51, range 0.24-0.81). Among low detectable birds, the pattern is reversed ( $$\bar{\phi }_{\text{LD males}}$$ ϕ ¯ LD males =0.64, range 0.37-0.89; $$\bar{\phi }_{\text{LD females}}$$ ϕ ¯ LD females =0.73, range 0.48-0.93). Probably the staging population contains a mixture of sex-specific migration strategies. A loss of staging females could greatly affect the dynamics of the western ruff population. Further unravelling of these population processes requires geographically extended demographic monitoring and the use of tracking devices. The Author(s), 2015 Capture-mark-resight nationallicence E-SURGE nationallicence Heterogeneity of detection nationallicence Multievent models nationallicence Philomachus pugnax nationallicence Staging behaviour nationallicence Schmaltz Lucie Conservation Ecology Group, Groningen Institute for Evolutionary Life Sciences (GELIFES), University of Groningen, P.O. Box 11103, 9700 CC, Groningen, The Netherlands aut Juillet Cédric Health, Environment and Indigenous Communities Research Group, Department of Environmental Resource Studies and Sciences, Trent University, 1600 West Bank Drive, K9J7B8, Peterborough, ON, Canada aut Tinbergen Joost Conservation Ecology Group, Groningen Institute for Evolutionary Life Sciences (GELIFES), University of Groningen, P.O. Box 11103, 9700 CC, Groningen, The Netherlands aut Verkuil Yvonne Conservation Ecology Group, Groningen Institute for Evolutionary Life Sciences (GELIFES), University of Groningen, P.O. Box 11103, 9700 CC, Groningen, The Netherlands aut Hooijmeijer Joslyn Conservation Ecology Group, Groningen Institute for Evolutionary Life Sciences (GELIFES), University of Groningen, P.O. Box 11103, 9700 CC, Groningen, The Netherlands aut Piersma Theunis Conservation Ecology Group, Groningen Institute for Evolutionary Life Sciences (GELIFES), University of Groningen, P.O. Box 11103, 9700 CC, Groningen, The Netherlands aut Population Ecology Springer Japan 57/4(2015-10-01), 613-624 1438-3896 57:4<613 2015 57 10144 https://doi.org/10.1007/s10144-015-0511-4 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10144-015-0511-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Schmaltz Lucie Conservation Ecology Group, Groningen Institute for Evolutionary Life Sciences (GELIFES), University of Groningen, P.O. Box 11103, 9700 CC, Groningen, The Netherlands aut NATIONALLICENCE 700 1- Juillet Cédric Health, Environment and Indigenous Communities Research Group, Department of Environmental Resource Studies and Sciences, Trent University, 1600 West Bank Drive, K9J7B8, Peterborough, ON, Canada aut NATIONALLICENCE 700 1- Tinbergen Joost Conservation Ecology Group, Groningen Institute for Evolutionary Life Sciences (GELIFES), University of Groningen, P.O. Box 11103, 9700 CC, Groningen, The Netherlands aut NATIONALLICENCE 700 1- Verkuil Yvonne Conservation Ecology Group, Groningen Institute for Evolutionary Life Sciences (GELIFES), University of Groningen, P.O. Box 11103, 9700 CC, Groningen, The Netherlands aut NATIONALLICENCE 700 1- Hooijmeijer Joslyn Conservation Ecology Group, Groningen Institute for Evolutionary Life Sciences (GELIFES), University of Groningen, P.O. Box 11103, 9700 CC, Groningen, The Netherlands aut NATIONALLICENCE 700 1- Piersma Theunis Conservation Ecology Group, Groningen Institute for Evolutionary Life Sciences (GELIFES), University of Groningen, P.O. Box 11103, 9700 CC, Groningen, The Netherlands aut NATIONALLICENCE 773 0- Population Ecology Springer Japan 57/4(2015-10-01), 613-624 1438-3896 57:4<613 2015 57 10144