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Body Girth as an Alternative to Body Mass for Establishing Condition Indexes in Field Studies: A Validation in the King Penguin 5
Viblanc, Vincent A.; Bize, Pierre; Criscuolo, Francois; Le Vaillant, Maryline; Saraux, Claire; Pardonnet, Sylvia; Gineste, Benoit; Kauffmann, Marion; Prud'Homme, Onesime; Handrich, Yves; Massemin, Sylvie; Groscolas, Rene; Robin, Jean-patrice.
Body mass and body condition are often tightly linked to animal health and fitness in the wild and thus are key measures for ecophysiologists and behavioral ecologists. In some animals, such as large seabird species, obtaining indexes of structural size is relatively easy, whereas measuring body mass under specific field circumstances may be more of a challenge. Here, we suggest an alternative, easily measurable, and reliable surrogate of body mass in field studies, that is, body girth. Using 234 free-living king penguins (Aptenodytes patagonicus) at various stages of molt and breeding, we measured body girth under the flippers, body mass, and bill and flipper length. We found that body girth was strongly and positively related to body mass in both molting...
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Ano: 2012 URL: http://archimer.ifremer.fr/doc/00098/20918/18590.pdf
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Starting with a handicap: phenotypic differences between early- and late-born king penguin chicks and their survival correlates 5
Stier, Antoine; Viblanc, Vincent A.; Massemin-challet, Sylvie; Handrich, Yves; Zahn, Sandrine; Rojas, Emilio R.; Saraux, Claire; Le Vaillant, Maryline; Prud'Homme, Onesime; Grosbellet, Edith; Robin, Jean-patrice; Bize, Pierre; Criscuolo, Francois.
1. The exceptionally long (c. 11 months) growth period of king penguin chicks (Aptenodytes patagonicus) is interrupted by the Austral winter. As a consequence, penguin chicks born late in the breeding season have little time to build-up their energy reserves before the drastic energy bottleneck they experience during winter and face greater risks of mortality than early-born chicks. 2. Whereas it is well known that breeding adults alternate between early- and late-breeding attempts, little is known on the phenotype of early- and late-chicks, and on the potential existence of specific adaptive phenotypic responses in late-born individuals. 3. We investigated phenotypic differences between early- and late-chicks and tested their survival correlates both...
Tipo: Text Palavras-chave: Early-life conditions; Phenotypic plasticity; Oxidative stress; Individual quality; Growth; Telomere; Corticosterone; Reproductive timing.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00170/28175/32107.pdf
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Telomere length reflects individual quality in free-living adult king penguins 5
Le Vaillant, Maryline; Viblanc, Vincent A.; Saraux, Claire; Le Bohec, Celine; Le Maho, Yvon; Kato, Akiko; Criscuolo, Francois; Ropert-coudert, Yan.
Growing evidence suggests that telomeres, non-coding DNA sequences that shorten with age and stress, are related in an undefined way to individual breeding performances and survival rates in several species. Short telomeres and elevated shortening rates are typically associated with life stress and low health. As such, telomeres could serve as an integrative proxy of individual quality, describing the overall biological state of an individual at a given age. Telomere length could be associated with the decline of an array of physiological traits in age-controlled individuals. Here, we investigated the links between individuals' relative telomere length, breeding performance and various physiological (body condition, natural antibody levels) and life...
Tipo: Text Palavras-chave: Breeding performances; Long-lived seabird; Natural antibody level; Body condition.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00302/41327/41093.pdf
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