Recent activity

Help needed - information on body mass loss while resting in shags

Elodie Camprasse, July 16, 2015

Hello all, I am a PhD student working on individual specialisations in seabirds and their consequences on reproductive success. I have worked on Kerguelen shags and so far have emphasized important differences in the consistency of their foraging strategies. I am now trying to link them with differences in mass gain during foraging trips. The problem I am facing at the moment is that my study birds have not been weighted in a consistent manner before departing for a trip and after returning to their colony. As a result, I am having trouble measuring an accurate mass gain that is solely associated with the amount of prey caught at sea as my measure of body mass at retrieval - body mass at deployment also includes a body mass loss during resting for up to 15 hours. I have not been successful at finding in the literature a way to correct these body masses so far and have no idea whether the body mass loss during resting would actually be significant enough to want to correct masses. Any tips/suggestions would be welcome! Thanks for paying attention to this request! Elodie