期刊
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
卷 288, 期 1951, 页码 -出版社
ROYAL SOC
DOI: 10.1098/rspb.2020.3118
关键词
Crassostrea virginica; heritability; quantitative genetics; rapid evolution; transgenerational plasticity
资金
- Louisiana Environmental Education Committee (LEEC) grant
- NSF-BioOCE [1731710]
- Louisiana Sea Grant award [NA14OAR4170099]
The salinity conditions in oyster breeding grounds in the Gulf of Mexico are expected to change drastically due to climate change and human-induced alterations in local hydrology. This study investigated the adaptive capacity of eastern oysters to low salinity through genetic variation and transgenerational plasticity. The results suggest that genetic variation, with a heritability estimated at 0.68 +/- 0.25, plays a key role in evolving traits for future salinity changes.
Salinity conditions in oyster breeding grounds in the Gulf of Mexico are expected to drastically change due to increased precipitation from climate change and anthropogenic changes to local hydrology. We determined the capacity of the eastern oyster, Crassostrea virginica, to adapt via standing genetic variation or acclimate through transgenerational plasticity (TGP). We outplanted oysters to either a low- or medium-salinity site in Louisiana for 2 years. We then crossed adult parents using a North Carolina II breeding design, and measured body size and survival of larvae 5 dpf raised under low or ambient salinity. We found that TGP is unlikely to significantly contribute to low-salinity tolerance since we did not observe increased growth or survival in offspring reared in low salinity when their parents were also acclimated at a low-salinity site. However, we detected genetic variation for body size, with an estimated heritability of 0.68 +/- 0.25 (95% CI). This suggests there is ample genetic variation for this trait to evolve, and that evolutionary adaptation is a possible mechanism through which oysters will persist with future declines in salinity. The results of this experiment provide valuable insights into successfully breeding low-salinity tolerance in this commercially important species.
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