Crested penguins (genus Eudyptes) have a peculiar hatching pattern, with the first-laid egg (A-egg) hatching after the second-laid egg (B-egg) and chicks from A-eggs typically having a much lower survival probability. Maternal yolk androgens have been suggested to contribute to the competitive superiority of the B-chick in southern rockhopper penguins Eudyptes chrysocome, given their important role in mediating sibling competition in other species. We therefore increased the yolk androgen levels in freshly-laid eggs and examined the consequences for sibling competition- via effects on embryonic developmental times, chick growth and early survival. We placed one androgen-treated egg and one control egg into each foster nest, matching them fo...
Hormonally mediated maternal effects link maternal phenotype and environmental conditions to offspri...
Hatching asynchrony in avian species generally leads to a size hierarchy among siblings, favouring t...
Black-headed gulls, Larus ridibundus, produce clutches of three eggs, which contain high levels of m...
Crested penguins (genus Eudyptes) have a peculiar hatching pattern, with the first-laid egg (A-egg) ...
Crested penguins (genus Eudyptes) have a peculiar hatching pattern, with the first-laid egg (A-egg) ...
Crested penguins (genus Eudyptes) have a peculiar hatching pattern, with the first-laid egg (A-egg) ...
Crested penguins (genus Eudyptes) have a peculiar hatching pattern, with the first-laid egg (A-egg) ...
Crested penguins (genus Eudyptes) have a peculiar hatching pattern, with the first-laid egg (A-egg) ...
Crested penguins (genus Eudyptes) have a peculiar hatching pattern, with the first-laid egg (A-egg) ...
Crested penguins (genus Eudyptes) have a peculiar hatching pattern, with the first-laid egg (A-egg) ...
Whether androgen deposition in eggs is physiologically costly for female birds has remained a crucia...
Hatching asynchrony in avian species generally leads to a size hierarchy among siblings, favouring t...
Hormonally mediated maternal effects link maternal phenotype and environmental conditions to offspri...
Hormonally mediated maternal effects link maternal phenotype and environmental conditions to offspri...
Hormonally mediated maternal effects link maternal phenotype and environmental conditions to offspri...
Hormonally mediated maternal effects link maternal phenotype and environmental conditions to offspri...
Hatching asynchrony in avian species generally leads to a size hierarchy among siblings, favouring t...
Black-headed gulls, Larus ridibundus, produce clutches of three eggs, which contain high levels of m...
Crested penguins (genus Eudyptes) have a peculiar hatching pattern, with the first-laid egg (A-egg) ...
Crested penguins (genus Eudyptes) have a peculiar hatching pattern, with the first-laid egg (A-egg) ...
Crested penguins (genus Eudyptes) have a peculiar hatching pattern, with the first-laid egg (A-egg) ...
Crested penguins (genus Eudyptes) have a peculiar hatching pattern, with the first-laid egg (A-egg) ...
Crested penguins (genus Eudyptes) have a peculiar hatching pattern, with the first-laid egg (A-egg) ...
Crested penguins (genus Eudyptes) have a peculiar hatching pattern, with the first-laid egg (A-egg) ...
Crested penguins (genus Eudyptes) have a peculiar hatching pattern, with the first-laid egg (A-egg) ...
Whether androgen deposition in eggs is physiologically costly for female birds has remained a crucia...
Hatching asynchrony in avian species generally leads to a size hierarchy among siblings, favouring t...
Hormonally mediated maternal effects link maternal phenotype and environmental conditions to offspri...
Hormonally mediated maternal effects link maternal phenotype and environmental conditions to offspri...
Hormonally mediated maternal effects link maternal phenotype and environmental conditions to offspri...
Hormonally mediated maternal effects link maternal phenotype and environmental conditions to offspri...
Hatching asynchrony in avian species generally leads to a size hierarchy among siblings, favouring t...
Black-headed gulls, Larus ridibundus, produce clutches of three eggs, which contain high levels of m...