Over het archief
Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.
Dit archief wordt uitgebouwd en beheerd volgens de principes van de Open Access Movement, en het daaruit ontstane Open Archives Initiative.
Basisinformatie over ‘Open Access to scholarly information'.
What ecological factors can affect albumen corticosterone levels in the clutches of seabirds? Timing of breeding, disturbance and laying order in rockhopper penguins (Eudyptes chrysocome chrysocome)
Poisbleau, M.; Demongin, L.; Angelier, F.; Dano, S.; Lacroix, A.; Quillfeldt, P. (2009). What ecological factors can affect albumen corticosterone levels in the clutches of seabirds? Timing of breeding, disturbance and laying order in rockhopper penguins (Eudyptes chrysocome chrysocome). Gen. Comp. Endocrinol. 162(2): 139-145. https://dx.doi.org/10.1016/j.ygcen.2009.03.022
In: General and Comparative Endocrinology. Elsevier: New York,. ISSN 0016-6480; e-ISSN 1095-6840, meer
|  |
| Trefwoorden |
Eudyptes chrysocome chrysocome (Forster, 1781) [WoRMS]
Marien/Kust |
| Author keywords |
Albumen corticosterone; Maternal investment; Disturbance; Reversedhatching asynchrony; Laying sequence; Laying date; Southern rockhopperpenguins (Eudyptes chrysocome chrysocome) |
| Auteurs | | Top |
- Poisbleau, M., meer
- Demongin, L., meer
- Angelier, F.
|
- Dano, S.
- Lacroix, A.
- Quillfeldt, P.
|
|
| Abstract |
Female birds deposit corticosterone into their eggs. Elevated concentrations of this hormone may interfere with the development of their offspring, and mothers should thus regulate corticosterone levels deposited into the eggs adaptively. However, if females are unable to regulate deposition, then the corticosterone concentration in eggs should reflect that in female plasma and should be influenced by stressors to the females. We measured corticosterone levels in the albumen of rockhopper penguins, and assessed their relationship with hatching order, human disturbance and laying date. Rockhopper penguins (Eudyptes chrysocome chrysocome) lay two eggs, of which the second egg (B-egg) is larger and hatches faster than the first egg (A-egg). The chick hatching from the B-egg is also much more likely to survive than its sibling. Albumen corticosterone concentrations were lower in B-eggs. However, as B-eggs contained more albumen than A-eggs, the total corticosterone deposited in the albumen was not significantly different between the two eggs. Daily disturbance by human observers during albumen production did not influence albumen corticosterone levels. Laying date had an effect on total albumen corticosterone through a higher albumen mass. However, we observed a high individual component in the composition of eggs from the same clutch. Thus, more work is required to explore the hypotheses of passive versus active transfer to eggs and to understand the adaptive value of contrary effects on the amount and concentration of corticosterone. |
IMIS is ontwikkeld en wordt gehost door het VLIZ.
