Abstract:
:We investigated genetic variability and genetic correlations in early life-history traits of Crassostrea gigas. Larval survival, larval development rate, size at settlement and metamorphosis success were found to be substantially heritable, whereas larval growth rate and juvenile traits were not. We identified a strong positive genetic correlation between larval development rate and size at settlement, and argue that selection could optimize both age and size at settlement. However, trade-offs, resulting in costs of metamorphosing early and large, were suggested by negative genetic correlations or covariances between larval development rate/size at settlement and both metamorphosis success and juvenile survival. Moreover, size advantage at settlement disappeared with time during the juvenile stage. Finally, we observed no genetic correlations between larval and juvenile stages, implying genetic independence of life-history traits between life-stages. We suggest two possible scenarios for the maintenance of genetic polymorphism in the early life-history strategy of C. gigas.
journal_name
J Evol Bioljournal_title
Journal of evolutionary biologyauthors
Ernande B,Clobert J,McCombie H,Boudry Pdoi
10.1046/j.1420-9101.2003.00543.xkeywords:
subject
Has Abstractpub_date
2003-05-01 00:00:00pages
399-414issue
3eissn
1010-061Xissn
1420-9101journal_volume
16pub_type
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