Genomic Ghosts: Philippine Fish Reveal a Century of Lost Diversity
Source PublicationProceedings of the National Academy of Sciences
Primary AuthorsClark, Reid, Garcia et al.
The vibrant tropical oceans, teeming with life, are facing threats we are only just beginning to see. While we focus on species loss, a new study reveals a more insidious form of damage: the erosion of genetic diversity. This variety within a species' genes is crucial for its ability to adapt and survive.
Scientists have long suspected such a decline in the tropics, but data has been scarce. To peer into the past, researchers compared the genomes of two commercially harvested fish species from a single location in the Philippines with samples from a century ago.
The results were stark. Both species showed a marked loss in genetic diversity and a dramatic reduction in their effective population size – the number of individuals successfully contributing to the gene pool. This hidden collapse, a direct consequence of a century of intense human activity, reveals the profound and lasting genomic scars being inflicted upon the world's most biodiverse marine regions.