Seasonal variation in the diet of Spoonbill chicks in the Wadden Sea: a stable isotopes approach

摘要

We used stable isotope tracers in the growing primary feathers of Eurasian Spoonbill chicks (Platalea leucorodia leucorodia) to study seasonal variation in their diet on one of the Frisian islands, Schiermonnikoog, The Netherlands. Using growing individual primaries as natural samplers over time, samples were taken along the length of primary feathers to estimate both within- and between-individual variation in diet. Absolute isotopic ratios of feather material ranged from -26.2 to -14.7 aEuro degrees for carbon (delta C-13) and from 13.0 to 18.7 aEuro degrees for nitrogen (delta N-15). The variation in delta C-13 values suggests the use of a variety of feeding habitats, ranging from freshwater to marine. Across the breeding season, there was a shift from predominantly freshwater prey early on to a more marine diet later in the season. Surprisingly, this shift did not occur within the growth trajectory of early born chicks which instead showed the opposite, but it did occur within individual chicks born later in the season. Stable isotope Bayesian mixing-model (SIAR) outcomes demonstrated that the freshwater/brackish prey had the highest isotopic contribution "(51 %; 95 % confidence interval 39-63 %) to the diet early in the breeding season, whereas marine prey contributed most (78 %; 66-89 %) to the diet later. That chicks fed with either freshwater or marine food items had similar body condition indices suggests that the eating of marine prey did not come at a major cost for growing Spoonbill chicks.C1 El-Hacen, El-Hacen Mohamed; Univ Groningen, Ctr Ecol and Evolutionary Studies, Anim Ecol Grp, POB 11103, NL-9700 CC Groningen, NetherlandsSC Dermatology; Meteorology & Atmospheric Sciences; Environmental Sciences & Ecology; Marine & Freshwater Biology