Conférences et séminaires » Séminaire présenté par Vincent VIBLANC, Doctorant, IPHC-DEPE
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Is there an energy cost to group-living ? Insights from heart rate monitoring in wild breeding king penguins.
Par : Vincent VIBLANC, Doctorant, IPHC-DEPE, Equipe Ecophysiologie Adaptative
Date : jeudi 16 décembre 2010 à 13h30
Lieu : IPHC, amphithéâtre Matthias Grünewald, bâtiment 25
For those having walked through the crowds which mass the seasonal world famous Christmas market of the European capital, the effects of population density and social stress on individuals’ physiology may intuitively seem plain as day. The insight takes root as many empirical studies show how population density might influence the biology and ecology of species throughout the animal kingdom. Surprisingly however, whereas the effects of population density on Darwinian fitness have been well investigated, very few studies have considered the association between social stress experienced at high densities and the energy expended by group-living animals. Yet, such studies would prove useful for understanding the evolution of group living in the light of a trade-off between advantages gained and costs suffered from aggregating with conspecifics. During this clubbing, I wish to present some preliminary results of my PhD research on colonial breeding in seabirds, and open a discussion on the costs of group-living. I will focus on two studies essentially. The first will investigate whether breeding penguins are sensitive to their social environment, and whether in a colonial species acclimatizing to social stress may be adaptive. The second will consider whether seasonal changes in the social environment may incur substantial energy costs on the long term, which may be consequent in a species where breeding is associated to periods of strong energy constraints (i.e. long term fasting).