Mardi 2 mai 2023 à 11h00, Paul Dufour – post-doctorant, Centre d’Ecologie Fonctionnelle et Evolution (CEFE) – CNRS et Tour du Valat – présentera en salle Jean-Paul Taris un séminaire/webinaire [1] intitulé :
« How important is vagrancy in ecology and evolution? »
Résumé
Individuals of a species recorded ‘out of range’, i.e., beyond their normal geographic range limits, are typically referred to as vagrants and have been enthusiastically catalogued by amateur naturalists for centuries. However, there has been relatively little interest in understanding the processes that underpin vagrancy, or exploration of its potential biological significance. While instances of vagrancy are by their nature rare, their occurrence may precipitate significant ecological or evolutionary consequences which would have typically been difficult to predict.
In this presentation, I will briefly review the state of knowledge on proximate mechanisms and ultimate drivers of vagrancy. Then, I will assess the evidence that vagrancy can have important ecological and evolutionary consequences that would be impossible to predict when neglecting the occurrence of rare events. Finally, I will expand on a possible evolutionary outcome of vagrancy that has been little studied so far – the evolution of new migration routes in birds – and will present the first results of my studies on Siberian species (Richard’s Pipit, Yellow-browed Warbler) occurring in Europe.
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Note: La présentation sera en français avec des supports en anglais.