Effects of Cold Winters on the Genetic Diversity of an Estuarine Fish, the Spotted Seatrout. Issue 1 (23rd June 2016)

• Record Type: Journal Article
• Authors: O'Donnell, Timothy P.; Arnott, Stephen A.; Denson, Michael R.; Darden, Tanya L.
• Is Part Of: Marine and coastal fisheries. Volume 8:Issue 1(2016)
• Page Start: 263
• Page End: 276
• Publication Date: 2016-06-23
• Subjects: Fisheries -- Periodicals; Pêches -- Périodiques; Fisheries; Periodicals; 639.205
• DOI: 10.1080/19425120.2016.1152333
• Languages: English
• ISSNs: 1942-5120

Abstract

Abstract: Spotted Seatrout Cynoscion nebulosus are recreationally important fish that have been harvested in South Carolina for centuries. The Spotted Seatrout in South Carolina suffered substantial declines in estuarine abundance during the cold winters of 2000, 2009, and 2010, when water temperatures dropped below their tolerance threshold. As these population declines may result in genetic bottlenecks and their repetitive occurrence over a short timescale could reduce the population's adaptive potential, we estimated the genetic diversity and effective population size ( Ne ) of the Charleston Harbor Spotted Seatrout population at six time points related to recent cold winters using a suite of 13 microsatellite markers. Grouping individuals by year‐class (fish spawned in the same year) was the most appropriate and effective method for measuring interannual fluctuations in observed and expected heterozygosity and allelic richness, superior to partitioning fish by collection year. The genetic diversity of Spotted Seatrout was significantly influenced by catch per unit effort, although only minor changes were observed and Ne remained high. Short overlapping generations appear to allow Spotted Seatrout to genetically recover during population growth and maintain moderate levels of genetic diversity. Received May 7, 2015; accepted February 2, 2016