Abstract
As shown for various species, nesting waders are non-randomly distributed on wetlands and preferentially select riparian nest-sites adjacent to limnic or marine waterbodies. Studying the redshank Tringa totanus, we tested the hypotheses that, in a coastal wader species which conceals its clutch in vegetation, predation and hatching success are affected by vegetation zonation, and that breeding in lower salt marsh areas has negative consequences for reproduction. We further predicted effects of timing of breeding and breeding experience/age of adults potentially reflected by egg biometrics both on nest-site selection and reproduction. Effects of vegetation, space, time and individual quality on hatching success of redshanks were studied in the German part of the Wadden Sea. Dominant plant species, vertical vegetation structure and nest concealment varied significantly between nests. Variation in nest concealment was relatively low: about 90% of clutches were classified as being well concealed. This variation was explainable by vegetation structure but not by vegetation composition at the nest-site, distance to shoreline, and time of clutch initiation. Vertical vegetation structure varied by dominant plant species but not by distance to shoreline and time of clutch initiation. Hatching success of clutches was low (10.6%) due to high predation (daily predation rate: 7.4%). Hatching success and duration of clutch survival were negatively and predation positively related to the date of clutch initiation. Furthermore, negative relationships were found between egg size and predation and duration of survival, respectively. We assume that concealed nests, early breeding and breeding experience diminish predation in salt marsh breeding redshanks. Thus, redshank reproduction appears to be affected by interactive effects of timing of breeding and vegetation facilitating early breeding. In contrast to open-nesting species, breeding in riparian habitats next to waterbodies may be disadvantageous for species breeding concealed in vegetation if these are covered by less structured vegetation.
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Acknowledgements
For their assistance during fieldwork and data processing, we would like to thank Rolf Nagel, Heike Büttger, Kerrin Lehn and Jutta Leyrer. Thanks also to Detlev Metzing and Albrecht Gerlach, University of Oldenburg, Germany, for co-operation and help with recording vegetation parameters. Peter H. Becker, Franz Bairlein, Birte Junge and Jutta Leyrer gave valuable comments on earlier drafts of the manuscript. Christine Frankovitch kindly checked the English. The Nationalparkverwaltung “Niedersächsisches Wattenmeer” gave permission to work on the salt marshes of the National Park. The study was supported by the III. Oldenburgischer Deichband, Jever, Germany. Many thanks to all of them.
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Thyen, S., Exo, KM. Interactive effects of time and vegetation on reproduction of redshanks (Tringa totanus) breeding in Wadden Sea salt marshes. J Ornithol 146, 215–225 (2005). https://doi.org/10.1007/s10336-005-0082-9
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DOI: https://doi.org/10.1007/s10336-005-0082-9