Museomics of an extinct European flat oyster population

Area of Science:

• Marine Biology
• Population Genomics
• Conservation Genetics

Background:

• Understanding factors driving species extinction is crucial for biodiversity research.
• Historical population genomics offers insights into past population dynamics and extinction risks.
• The European oyster (Ostrea edulis L.) has experienced significant population declines.

Purpose of the Study:

• To investigate the historical population genomics of an extinct European oyster population from the Wadden Sea.
• To compare the Wadden Sea population with contemporary French and English populations.
• To identify potential genetic factors contributing to the extinction of the Wadden Sea oyster population.

Main Methods:

• Museomic analysis of historical oyster samples (1868-1888).
• Population genomic comparisons using Fst outlier loci.
• Analysis of historical population-wide genomic diversity.

Main Results:

• The extinct Wadden Sea oyster population was genetically isolated from French and English populations.
• Evidence of local adaptation was found in the Wadden Sea population (Fst outlier loci).
• Genomic diversity suggests a sudden population contraction in the Wadden Sea oysters.

Conclusions:

• Genetic isolation and lack of natural replenishment may have predisposed the Wadden Sea oysters to extinction.
• Local adaptation, while indicating unique evolutionary history, did not prevent decline.
• Historical population genomics reveals potential drivers of extinction in marine invertebrates.