Publicaties | Kaarten

nieuwe zoekopdracht

[ meld een fout in dit record ]mandje (0): toevoegen | toon Print deze pagina
Migratory constraints on yolk precursors limit yolk androgen deposition and underlie a brood reduction strategy in rockhopper penguins
Crossin, G.; Poisbleau, M.; Demongin, L.; Chastel, O.; Williams, T.; Eens, M.; Quillfeldt, P. (2012). Migratory constraints on yolk precursors limit yolk androgen deposition and underlie a brood reduction strategy in rockhopper penguins. Biol. Lett. 8(6): 1055-1058. https://dx.doi.org/10.1098/rsbl.2012.0476
In: Biology Letters. Royal Society Publishing: London. ISSN 1744-9561; e-ISSN 1744-957X
Peer reviewed article  
Beschikbaar in  Auteurs 
Trefwoord
    Marien/Kust
Author keywords
    androstenedione; testosterone; physiological epiphenomenon hypothesis;vitellogenin; maternal effects; carryover effects
Auteurs  Top 
  • Crossin, G.
  • Poisbleau, M.
  • Demongin, L.
  • Chastel, O.
  • Williams, T.
  • Eens, M.
  • Quillfeldt, P.
Abstract
    Hormonally mediated maternal effects link maternal phenotype and environmental conditions to offspring phenotype. The production of lipid-rich maternal yolk precursors may provide a mechanism by which lipophilic steroid hormones can be transported to developing yolks, thus predicting a positive correlation between yolk precursors in mothers and androgen levels in eggs. Using rockhopper penguins (Eudyptes chrysocome), which produce a two-egg clutch characterized by extreme egg-size dimorphism, reversed hatching asynchrony and brood-reduction, we examined correlations between circulating concentrations of the primary yolk-precursor vitellogenin (VTG) and levels of yolk androgens. Previous work in Eudyptes penguins has shown that egg-size dimorphism is the product of migratory constraints on yolk precursor production. We predicted that if yolk precursors are constrained, androgen transport to developing yolks would be similarly constrained. We reveal positive linear relationships between maternal VTG and androgens in small A-eggs but not larger B-eggs, which is consistent with a migratory constraint operating on the A-egg. Results suggest that intra-clutch variation in total yolk androgen levels depends on the production and uptake of yolk precursors. The brood reduction strategy common to Eudyptes might thus be best described as the result of a migratory constraint.
Alle informatie in het Integrated Marine Information System (IMIS) valt onder het VLIZ Privacy beleid Top | Auteurs 
IMIS is ontwikkeld en wordt gehost door het VLIZ.