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ARS Home » Northeast Area » Orono, Maine » National Cold Water Marine Aquaculture Center » Research » Publications at this Location » Publication #388898

Research Project: Genetic Improvement of North American Atlantic Salmon and the Eastern Oyster for Aquaculture Production

Location: National Cold Water Marine Aquaculture Center


item PURITZ, JON - University Of Rhode Island
item ZHAO, HONGGANG - Cornell University
item WEEDOP, BODIE - Northeastern University
item MODAK, TEJASHREE - University Of Rhode Island
item ROBERTS, ERIN - University Of Rhode Island
item ALLEN, STAN - Virginia Institute Of Marine Science
item HARE, MATT - Cornell University
item LOTTERHOS, KATIE - Northeastern University
item RAWSON, PAUL - University Of Maine
item SCHWARTZ, RACHEL - University Of Rhode Island
item Proestou, Dina
item GUO, XIMING - Rutgers University
item WARREN, WES - University Of Missouri
item GOMEZ-CHIARRI, MARTA - University Of Rhode Island

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 12/7/2020
Publication Date: N/A
Citation: N/A

Interpretive Summary: N/A

Technical Abstract: Genetic variation in the eastern oyster has been studied for over half a century with questions relating to adaptation, disease tolerance, population structure, sweepstakes reproduction and much more. Interest has been sustained because of this species’ commercial importance, the desire to supplement populations for fisheries or restoration purposes, and with basic research questions. Many of these endeavors were limited by the genetic resources available. The chromosome-scale reference genome assembly for C. virginica, described in this talk, represents a turning point. Metrics indicating robustness of the assembly and some basic genome structure findings will be described before focusing on geographic population structure and selected strain divergence as examples where genome-scale analysis of diversity provides new insights. Samples from Maine to Texas, along with five of the major selected strains, were subjected to whole genome re-sequencing. The overwhelming and genomically pervasive pattern is divergence between Atlantic and Gulf of Mexico (GoM) regions, recapitulating previous inferences from lower resolution mitochondrial and nuclear marker studies. High genetic diversity has been maintained in all selected strains examined, and their divergence from source stocks is modest relative to the Atlantic - GoM divide. Evidence of selection affecting specific loci was most convincing in high and low salinity contrasts within estuaries, where background noise from genetic drift was likely reduced by high gene flow.