Roseate Terns Sterna dougallii successfully rearing a young Sandwich Tern S. sandvicensis
Cadiou, B.1* 
and Jacob, Y.2
https://doi.org/10.61350/sbj.23.139
* Correspondence author. Email: bernard.cadiou@bretagne-vivante.org
1 Bretagne Vivante - SEPNB, 186 rue Anatole France, BP 63121, F-29231 BREST cedex 3, France
2 Réserve ornithologique des îlots de la baie de Morlaix, Bretagne Vivante-SEPNB, 10 rue de Brest, F-29600 Morlaix, France
Introduction
Isle aux Dames in the Bay of Morlaix, northern Brittany (48°41’N 3°53’W), holds one of the largest mixed tern colonies in France, with Sandwich Terns Sterna sandvicensis, Roseate Terns S. dougallii and Common Terns S. hirundo, and this island has been the main French Roseate Tern colony since the 1980s (Cadiou et al. 2004; Le Nevé 2005). Annual surveys are conducted to obtain data on breeding numbers and productivity. In 2007 the census of the colony was carried out on 12 June by a team of eight experienced and inexperienced people. Different teams covered different areas of the colony, counting nests, using different colour of small paper marks put inside to avoid double-counting, and reporting nest-contents.
Acknowledgements
This work was funded by the EU Life-Nature programme LIFE05 NAT/F/000137 ‘Conservation of the Roseate Tern in Brittany’ (2006–2010). Rings were provided by CRBPO (French ringing scheme) and BTO (Roseate special rings). We are grateful to Jean-Noël Ballot, Yannick Cherel, Émilie Drunat, Jonathan Gueguen, Jean-Raymond Guivarc’h, Even de Kergariou, Maïwenn Magnier, Bertrand Rivoal and Laurent Thébault for their help in fieldwork, and to Jean-Yves Monnat, Steve Newton, Ian Nisbet, Norman Ratcliffe and Jorge Saliva for providing comments and unpublished data. Steve Newton improved the English of the manuscript, and Martin Heubeck and an anonymous referee provided additional helpful comments.
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