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Wisner, Brynne; Wang, Zhenwei; Sheehan, Ailey; Guo, Ximing; Munroe, Daphne
Estuaries and coasts, 03/2024, Letnik: 47, Številka: 2Journal Article
The Atlantic surfclam ( Spisula solidissima solidissima ) is an economically valuable clam species that supports a major US fishery. Until recently, fishery efforts along the southern edge of the surfclam range were low due to clam mortalities there in the 1990s. Recent surfclam fishing efforts off Virginia raised questions of whether the surfclam population has returned in the southern region or if a single cohort is supporting the fishery there. Questions have also arisen about whether S. s. similis is among the population fished off the coast of VA. Spisula solidissima similis is a warm-water cryptic subspecies of the Atlantic surfclam. Although morphologically indistinguishable, S. s. similis grows to a smaller size and is genetically distinct. Atlantic surfclams ( n = 103) were collected from the fishing grounds off the coast of VA. Each surfclam was aged, and shell length and tissue weight recorded for comparison to surfclams of the same age from the center of the population. Analyses of mitochondrial (mtCOI) sequences suggests that the two groups sampled off VA are genetically homogeneous, both groups contain two divergent mitochondrial lineages, and one surfclam sampled shares the S. s. similis mtCOI sequence. There are multiple cohorts of surfclams, suggesting that environmental conditions may have improved for surfclams in the south, or that this population has acclimated to altered conditions. Further research should investigate the potential for subspecies hybridization.
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