The recent PhD thesis defense by Mariana unveiled important insights into marine genetic connectivity along the stunning coast of California and Baja California. Her research examined various marine species, enhancing our understanding of genetic patterns, evolutionary changes, and their impact on managing marine biodiversity.
Mariana’s work focused on reconstruction of genetic connectivity among 63 species, which included fish, invertebrates, algae, seagrasses, and marine mammals. By evaluating data from 200 studies published between 2000 and 2023, she identified 42 genetic breaks along her study area. These breaks were commonly located in biogeographical transition zones like Punta Eugenia and Punta Concepción. This finding indicates that such areas may act as natural obstacles to genetic flow among the studied species, each with unique life history traits that complicate interconnections. Access full paper on this topic here.
Mariana also explored the genetic makeup of the white seabass Caulolatilus princeps, a key species in Baja California's artisanal fishery. The research examined samples from four sites: Islas Coronado, San Quintín, Santa Rosaliita, and Bahía Tortugas. Through the analysis of 1,607 single nucleotide polymorphisms (SNPs), Mariana measured genetic diversity and conducted multivariate and Bayesian genetic structure analyses. The findings were noteworthy; they showed minimal genetic differentiation among the locations, with a global Fst value of -0.0002 and a p-value of 1. This suggests the presence of two distinct genetic clusters that do not match geographically. This aligns with findings of high gene flow among the locations, indicating a more intricate structure than previously thought.
Implications for Environmental Management
Mariana’s research has significant implications for managing marine biodiversity along the California and Baja California coasts. By revealing genetic connectivity patterns, her work offers vital insights into how marine species could respond to environmental shifts, fishing impacts, and habitat loss.
Identifying these genetic breaks can guide conservation efforts aimed at preserving isolated populations, helping to maintain high genetic diversity across species. Moreover, understanding species like Caulolatilus princeps can support sustainable fishing practices that protect the economic and ecological health of marine resources in the region.
Moving forward, integrating these findings into policy and conservation efforts is crucial. This approach will better equip us to address future challenges, ensuring our coastal ecosystems remain resilient and thriving for years to come.
Comments