Anisotropic larval connectivity and metapopulation structure driven by directional oceanic currents in a marine fish targeted by small-scale fisheries
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The dispersal during the planktonic larval period is a key feature to understand the metapopulation structure of marine fishes, and is commonly described by four general models: (1) lack of population structure due to extensive larval dispersal; (2) isolation by geographic distance, where larval connectivity decreases with increasing distance between sites in all directions (isotropy); (3) population structure without any clear geographic trend (chaotic); and (4) population structure explained by seascape approaches that explicitly incorporate the spatial and temporal variations in the direction and strength of oceanic currents via oceanographic modeling. We tested the four models in the Pacific red snapper Lutjanus peru, a key commercial species in the Gulf of California (GC), Mexico. We genotyped 15 microsatellite loci in 225 samples collected during 2015–2016 from 8 sites, and contrasted the observed empirical genetic patterns against predictions from each model. We found low but significant levels of population structure among sites. Only the seascape approach was able to significantly explain levels of genetic structure and diversity, but exclusively within spring and summer, suggesting that this period represents the spawning season for L. peru. We showed that in the GC, the strong asymmetry in the oceanic currents causes larval connectivity to show different values when measured in distinct directions (anisotropy). Management tools, including marine reserves, could be more effective if placed upstream of the predominant flow. Managers should consider that oceanographic distances describing the direction and intensity of currents during the spawning period are significant predictors of larval connectivity between sites, as opposed to geographic distances.
We would like to acknowledge Juan Leonardo Lucero Cuevas (Tito), Aaron León, Jose Amador Gutierrez (Pepe), Amairany León, Mariely Alvarez, Jaime de la Toba and Joel Castro for their assistance with acquiring samples in the field. Mariana Walther helped with logistics during the early stage of the project. Geraldine Parra, Alexander Ochoa, Karla Vargas, Jose Francisco Dominguez-Contreras (Borre), and Stacy L. Sotak helped us at various stages during microsatellite genotyping. DAPG received a CONACYT fellowship (250126). This work was funded by The Walton Family Foundation Grant # 2011-1235, The David and Lucile Packard Foundation Grants #2013-39359, #2013-39400, and #2015-62798, and Fondo Institucional CONACYT-Fronteras de la Ciencia (Project 26/2016).
Compliance with ethical standards
All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. Necessary permits were obtained prior to conducting the research.
Conflict of interest
All authors declare that they have no conflict of interest.
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