Complex patterns of genetic population structure in the mouthbrooding marine catfish, Bagre marinus, in the Gulf of Mexico and U.S. Atlantic

Author:

Portnoy David S.1ORCID,O'Leary Shannon J.2ORCID,Fields Andrew T.1ORCID,Hollenbeck Christopher M.1,Grubbs R. Dean3,Peterson Cheston T.3,Gardiner Jayne M.4,Adams Douglas H.5,Falterman Brett6,Drymon J. Marcus78ORCID,Higgs Jeremy M.9,Pulster Erin L.1011,Wiley Tonya R.12,Murawski Steven A.11

Affiliation:

1. Marine Genomics Laboratory, Department of Life Sciences Texas A&M University – Corpus Christi Corpus Christi Texas USA

2. Department of Biological Sciences Saint Anselm College Manchester New Hampshire USA

3. Florida State University Coastal and Marine Laboratory St. Teresa Florida USA

4. New College of Florida Sarasota Florida USA

5. Florida Fish and Wildlife Conservation Commission Fish and Wildlife Research Institute, Indian River Field Lab Melbourne Florida USA

6. Fisheries Research Support Mandeville Louisiana USA

7. Mississippi State University Coastal Research and Extension Center Biloxi Mississippi USA

8. Mississippi‐Alabama Sea Grant Consortium Ocean Springs Mississippi USA

9. Center for Fisheries Research and Development The University of Southern Mississippi Ocean Springs Mississippi USA

10. U.S. Geological Survey, Columbia Environmental Research Center Columbia Missouri USA

11. College of Marine Science University of South Florida St. Petersburg Florida USA

12. Havenworth Coastal Conservation Palmetto Florida USA

Abstract

AbstractPatterns of genetic variation reflect interactions among microevolutionary forces that vary in strength with changing demography. Here, patterns of variation within and among samples of the mouthbrooding gafftopsail catfish (Bagre marinus, Family Ariidae) captured in the U.S. Atlantic and throughout the Gulf of Mexico were analyzed using genomics to generate neutral and non‐neutral SNP data sets. Because genomic resources are lacking for ariids, linkage disequilibrium network analysis was used to examine patterns of putatively adaptive variation. Finally, historical demographic parameters were estimated from site frequency spectra. The results show four differentiated groups, corresponding to the (1) U.S. Atlantic, and the (2) northeastern, (3) northwestern, and (4) southern Gulf of Mexico. The non‐neutral data presented two contrasting signals of structure, one due to increases in diversity moving west to east and north to south, and another to increased heterozygosity in the Atlantic. Demographic analysis suggested that recently reduced long‐term effective population size in the Atlantic is likely an important driver of patterns of genetic variation and is consistent with a known reduction in population size potentially due to an epizootic. Overall, patterns of genetic variation resemble that of other fishes that use the same estuarine habitats as nurseries, regardless of the presence/absence of a larval phase, supporting the idea that adult/juvenile behavior and habitat are important predictors of contemporary patterns of genetic structure.

Funder

Gulf of Mexico Research Initiative

Publisher

Wiley

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