Separate effects of triploidy, parentage and genomic diversity upon feeding behaviour, metabolic efficiency and net energy balance in the Pacific oyster Crassostrea gigas
|Author(s)||Hawkins Ajs, Magoulas A, Heral Maurice, Bougrier Serge, Naciri-Graven Y, Day Aj, Kotoulas G|
|Affiliation(s)||Natl Environm Res Council, Plymouth Marine Lab, Ctr Coastal Marine Sci, Plymouth PL1 3DH, Devon, England.
Inst Francais Rech Exploitat Mer, F-17390 La Tremblade, France.
Inst Marine Biol Crete, Iraklion 71003, Crete, Greece.
Conservatorie & Jardin Bot, CH-1292 Geneva, Switzerland.
|Source||Genetical Research (0016-6723) (Cambridge Univ Press), 2000-12 , Vol. 76 , N. 3 , P. 273-284|
|WOS© Times Cited||36|
|Abstract||Triploid oysters were induced using cytochalasin B upon retention of either the first (meiosis I triploids) or the second (meiosis II triploids) polar body in embryos from a single cohort derived from mixed parentage. Allozyme and microsatellite assays enabled the confirmation of both parentage and triploidy status in each oyster. Comparison of meiosis I triploids, meiosis II
triploids and diploid siblings established that improved physiological performance in triploids was associated with increased allelic variation, rather than with the quantitative dosage effects of ploidy status. An unidentified maternal in¯uence also interacted with genotype. Among full sibs, allelic
variation measured as multi-locus enzyme heterozygosity accounted for up to 42% of the variance in physiological performance; significant positive in influences were identified upon feeding rate, absorption efficiency, net energy balance and growth efficiency (=net energy balance/energy absorbed). Whilst allelic variation was greater in both meiosis I and meiosis II triploids than in
diploid siblings, both allelic variation and net energy balance were highest in triploids induced at meiosis I. This suggests that it may be preferable to induce triploidy by blocking meiosis I, rather than meiosis II as has traditionally been undertaken during commercial breeding programmes.