Genetic structure and identification of divergent genomic regions of Solen grandis from three geographic populations based on whole genome resequencing

The recent study on the genetic structure of *Solen grandis*, commonly known as the grand jackknife clam, sheds light on the genetic variation across three geographical populations in China: Huludao (HLD), Rizhao (RZ), and Dongtai (DT). Utilizing whole-genome resequencing, researchers found that these populations exhibit low genetic diversity, as evidenced by specific metrics such as observed heterozygosity ranging from 0.097 to 0.101. While these figures may seem alarming, they also underscore the importance of understanding genetic diversity in marine species, a topic that resonates with ongoing discussions in marine biology, such as those explored in Estimating genetic diversity of abundant oceanic dolphins through repeated environmental DNA sampling and Genomic insights into population structure and somatic condition in the European sardine.

The low genetic diversity found in *Solen grandis* is particularly significant given its high economic value in mariculture. This finding raises critical questions about the resilience of these clam populations in the face of environmental changes and anthropogenic pressures. With an inbreeding coefficient (FIS) ranging from 0.042 to 0.053, there are implications for the long-term viability of these populations. Such conditions could hinder their ability to adapt to changing environments, making them more susceptible to diseases and fluctuations in habitat conditions. The genetic insights derived from this study could serve as a reference point for conservation strategies, emphasizing the need for proactive measures in managing genetic resources effectively.

The study's identification of 32 candidate selected regions and 10 significant genes also opens doors for future research. These genes, including ACE and RPS13, may play crucial roles in the clam's physiological processes and resilience to stressors. Understanding these genetic mechanisms can inform selective breeding programs aimed at enhancing the adaptability and productivity of *Solen grandis*. As we continue to confront challenges such as climate change and habitat degradation, the implications of this research extend beyond academic interest; they are vital for sustainable fisheries management and the economic stability of coastal communities reliant on this bivalve.

Moving forward, the role of genetic research in marine species conservation cannot be overstated. This study serves as a reminder that genetic diversity is not merely a statistic; it is a key component of ecological resilience. As we observe developments in marine genomics and conservation strategies, it is crucial to ask how we can leverage these insights for broader ecological benefits. Will the findings on *Solen grandis* prompt a reevaluation of mariculture practices in light of genetic health? The intersection of genetics and environmental stewardship is an area worth monitoring closely, as it holds the potential to guide future efforts in preserving not just *Solen grandis*, but a myriad of marine species facing similar challenges.