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Helfenstein, Fabrice
Résultat de la recherche
Resistance to oxidative stress shows low heritability and high common environmental variance in a wild bird
2014, Losdat, Sylvain, Helfenstein, Fabrice, Blount, Jonathan D., Richner, Heinz
Immune activation reduces sperm quality in the great tit
2011, Losdat, Sylvain, Richner, Heinz, Blount, Jonathan D., Helfenstein, Fabrice
Sperm of colourful males are better protected against oxidative stress
2010, Helfenstein, Fabrice, Losdat, Sylvain, Moller, Anders Pape, Blount, Jonathan D., Richner, Heinz
Nestling erythrocyte resistance to oxidative stress predicts fledging success but not local recruitment in a wild bird
2013, Losdat, Sylvain, Helfenstein, Fabrice, Blount, Jonathan D., Marri, V., Maronde, L., Richner, Heinz
Stressful conditions experienced by individuals during their early development have long-term consequences on various life-history traits such as survival until first reproduction. Oxidative stress has been shown to affect various fitness-related traits and to influence key evolutionary trade-offs but whether an individual's ability to resist oxidative stress in early life affects its survival has rarely been tested. In the present study, we used four years of data obtained from a free-living great tit population (Parus major; n = 1658 offspring) to test whether pre-fledging resistance to oxidative stress, measured as erythrocyte resistance to oxidative stress and oxidative damage to lipids, predicted fledging success and local recruitment. Fledging success and local recruitment, both major correlates of survival, were primarily influenced by offspring body mass prior to fledging. We found that pre-fledging erythrocyte resistance to oxidative stress predicted fledging success, suggesting that individual resistance to oxidative stress is related to short-term survival. However, local recruitment was not influenced by pre-fledging erythrocyte resistance to oxidative stress or oxidative damage. Our results suggest that an individual ability to resist oxidative stress at the offspring stage predicts short-term survival but does not influence survival later in life.
Reproductive effort transiently reduces antioxidant capacity in a wild bird
2011, Losdat, Sylvain, Helfenstein, Fabrice, Gaude, Benoît, Richner, Heinz
Females of carotenoid-supplemented males are more faithful and produce higher quality offspring
2008, Helfenstein, Fabrice, Losdat, Sylvain, Saladin, Verena, Richner, Heinz
Higher in vitro resistance to oxidative stress in extra?pair offspring
2011, Losdat, Sylvain, Helfenstein, Fabrice, Saladin, Verena, Richner, Heinz
Effect of sibling competition and male carotenoid supply on offspring condition and oxidative stress
2010-11-28, Losdat, Sylvain, Helfenstein, Fabrice, Gaude, Benoît, Richner, Heinz