Development and application of genomic tools to the restoration of green abalone in southern California
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Abstract
Due to severe declines in abundance throughout southern California, the green abalone (Haliotis fulgens Philippi 1845) became protected under a state-sponsored fishery moratorium in 1997 and was declared a NOAA NMFS Species of Concern in 2004. Recently, H. fulgens was chosen for possible stock restoration via translocation of wild adults to depleted habitat and supplementation through releasing cultured individuals. Before a management plan could be developed, however, an understanding of the species’ natural population genetic structure was needed. We used a genomic technique called restriction site associated DNA sequencing (RADSeq) to address the issue. RADSeq enabled discovery of 1,209 single nucleotide polymorphisms theoretically spread genome-wide in H. fulgens. Analyses suggested the species may be panmictic throughout our sampled range, with an effective population size (Ne) of 1,100–3,600. Hence, limitations to management, such as requiring local broodstock and restricting translocation potential, might be unnecessary. Sites with larger populations may be suitable sources for restoration of depleted sites (e.g. the Palos Verdes Peninsula), although the extent of local adaptation remains unknown. Despite this potential for restoration, results gathered on a sample of cultured H. fulgens illustrated how quickly genetic diversity can be lost through captive breeding. To help mitigate a drop in Ne due to hatchery supplementation, we recommend collection and replacement of ≥100 wild abalone per generation for broodstock and close management of the proportion of cultured individuals in the wild. Successful implementation will depend on operational capacity and the resilience of the source populations to broodstock collection.
Keywords
Abalone Genomics Population genetics Restriction site associated DNA sequencing Single nucleotide polymorphism Stock enhancementNotes
Acknowledgments
This work was supported by the U.S. Department of Commerce’s National Oceanic and Atmospheric Administration (NOAA) under a Species of Concern Internal Grant awarded to Ford et al. and an Office of Aquaculture Research Tiger Team Internal Grant awarded to Dr. Hyde. Wesley Larson was supported by a National Science Foundation Graduate Research Fellowship Grant # DGE-0718124. The views expressed herein do not necessarily reflect the views of those organizations. Tissue from wild H. fulgens was collected by the authors, as well as Brian Meux, Ray Hiemstra, and several staff. The SEA Lab sample was provided by Brent Scheiwe. Dr. Jim Seeb at the University of Washington provided guidance and laboratory space. We would like to thank Seeb Lab members Carita Pascal for lab instruction and Ryan Waples for help initiating the Stacks pipeline. We would also like to thank Drs. Fred Utter, Brent Vadopalas, and Robin Waples and two anonymous reviewers for valuable commentary on this manuscript.
Supplementary material
References
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