caa a22 4500 463175107 CHVBK 20180406164823.0 cr unu---uuuuu 170326e20070101xx s 000 0 eng 10.1007/s10336-006-0102-4 doi (NATIONALLICENCE)springer-10.1007/s10336-006-0102-4 Reproductive parameters in relation to food supply in the whiskered tern ( Chlidonias hybrida ) [Elektronische Daten] [Jean-Marc Paillisson, Sébastien Reeber, Alexandre Carpentier, Loïc Marion] It is generally accepted that breeding terns are sensitive to food supply and that their reproductive effort could be substantially affected by the availability and access to resources. In this study we examined reproductive parameters in the whiskered tern Chlidonias hybrida in relation to food supply during the courtship feeding period (food brought by males to females) over a 2-year period (2004-2005). We also studied whether the condition of the nestlings [body condition index (BCI)] was related to a proxy of the reproductive investment of the adults (the clutch size) during a season of food shortage. Behavioural observations showed a decrease in the intensity of male courtship feeding between years (2004>2005), and a strong shift in the relative abundance of the two prey groups (invertebrates/fish; invertebrate prey dropped from 88.0 to 49.3%) brought by males. This change in food delivery rates did not result in a delay in laying, but there was a significant difference in mean clutch size between years (2.71±0.49 eggs in 2004 and 2.05±0.78 eggs in 2005) without any within-year variation in relation to the laying dates. The egg size (volume and length) was related to the year (2004<2005), suggesting a trade-off in the quantity and the quality of eggs between the two seasons. We also found no evidence that the investment in a large clutch affected nestling BCI in the course of the food shortage season. Since many pairs (about 60%) interrupted breeding during the incubation stage, we assumed that parents that succeeded in rearing nestlings in these conditions were probably ‘high-quality' individuals. Our results therefore showed that whiskered terns are sensitive to the varying food conditions they experienced throughout the courtship period. The diversity of prey types could be a key factor in the reproductive investment of this tern species. Dt. Ornithologen-Gesellschaft e.V., 2006 Body condition nationallicence Chlidonias hybrida nationallicence Clutch size nationallicence Courtship feeding nationallicence Egg size nationallicence Laying date nationallicence Paillisson Jean-Marc UMR-CNRS 6553 Ecobio, Biologie des Populations et de la Conservation, Campus de Beaulieu, Université de Rennes 1, Av. du Général Leclerc, 35042, Rennes, France aut Reeber Sébastien SNPN, Réserve naturelle du Lac de Grand-Lieu, 15 rue de la Châtaigneraie, 44830, Bouaye, France aut Carpentier Alexandre UMR-CNRS 6553 Ecobio, Biologie des Populations et de la Conservation, Campus de Beaulieu, Université de Rennes 1, Av. du Général Leclerc, 35042, Rennes, France aut Marion Loïc UMR-CNRS 6553 Ecobio, Biologie des Populations et de la Conservation, Campus de Beaulieu, Université de Rennes 1, Av. du Général Leclerc, 35042, Rennes, France aut Journal of Ornithology Springer-Verlag 148/1(2007-01-01), 69-77 0021-8375 148:1<69 2007 148 10336 https://doi.org/10.1007/s10336-006-0102-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10336-006-0102-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Paillisson Jean-Marc UMR-CNRS 6553 Ecobio, Biologie des Populations et de la Conservation, Campus de Beaulieu, Université de Rennes 1, Av. du Général Leclerc, 35042, Rennes, France aut NATIONALLICENCE 700 1- Reeber Sébastien SNPN, Réserve naturelle du Lac de Grand-Lieu, 15 rue de la Châtaigneraie, 44830, Bouaye, France aut NATIONALLICENCE 700 1- Carpentier Alexandre UMR-CNRS 6553 Ecobio, Biologie des Populations et de la Conservation, Campus de Beaulieu, Université de Rennes 1, Av. du Général Leclerc, 35042, Rennes, France aut NATIONALLICENCE 700 1- Marion Loïc UMR-CNRS 6553 Ecobio, Biologie des Populations et de la Conservation, Campus de Beaulieu, Université de Rennes 1, Av. du Général Leclerc, 35042, Rennes, France aut NATIONALLICENCE 773 0- Journal of Ornithology Springer-Verlag 148/1(2007-01-01), 69-77 0021-8375 148:1<69 2007 148 10336 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer