Extinction risks in deep-sea populations revealed by genomic data and ecological niche modeling.

Genomic and niche-modeling analyses of five Gulf of Mexico mesopelagic species show current effective population sizes below long-term viability thresholds and forecast declining habitat suitability under future climate scenarios.

• Why it matters: The deep sea’s conservation status is largely unknown, especially for the mesopelagic zone, leaving a gap in assessing extinction risk despite its ecological importance.
• What they did: Using genomic data from 2011–2023 and ecological niche modeling, the study assessed five mesopelagic species’ effective population sizes, tracked genomic diversity changes over a decade, ran demographic modeling for historical declines, and projected habitat suitability under future climate change scenarios.
• The result: All five species had effective population sizes below minimum long-term viability thresholds; some showed genomic diversity declines comparable to threatened taxa, demographic modeling indicated historical declines, and niche models predicted declining Gulf habitat suitability for most species.

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