Bauchau, V. and Horn, H. and Overdijk, O. (1998) Survival of Spoonbills on Wadden Sea islands. Journal of Avian Biology, 29, 177-182. ISSN 0908-8857.
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Official URL: http://www.jstor.org/stable/3677196
The Spoonbill populations in Europe are fragmented and threatened. The dynamics of the species is poorly known but ringing and observation programmes are under way. Here we estimated the local survival of two colour-ringed populations of Spoonbills in the Netherlands. Adult survival and sighting rates, estimated with the Cormack-Jolly-Seber model, were high and constant over a 10-year period (1986-1996) and no differences could be detected between the two populations. Juvenile survival, estimated from the observed return rate, did not vary over a 5-year period (cohorts 1986-1990). However, at least in one of the two populations, the proportion of birds returning by two years of age increased over a 9-year period (cohorts 1986-1994). Thus there is only weak support for the idea that the recent increase in population size was driven by an increase in local survival. Our work on survival provide a first step towards a larger appreciation of the population dynamics and life-history of the Spoonbill.
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