GENOMIC SIGNATURES OF PRE-ADAPTATION AND POST-INVASION RAPID ADAPTIVE EVOLUTION IN THE BLUESPOTTED CORNETFISH, A MEDITERRANEAN LESSEPSIAN INVADER
Biological invasions are increasingly creating ecological and economical disasters both on land and in aquatic environments. For over a century, the Mediterranean Sea has steadily been invaded by Red Sea species (called Lessepsian invaders) via the Suez Canal, with a current estimate of approximately 450 species. The bluespotted cornetfish, Fistularia commersonii, considered a “Lessepsian sprinter”, entered the Mediterranean in 2000, and by 2005 had invaded the entire basin from Israel to Spain. The situation is unique and interesting both because of its unprecedented rapidity, and by the fact that it took this species approximately 130 years to migrate from the Red Sea into the Mediterranean. Using genome scans, with restriction site associated DNA (RAD) sequencing, we evaluated neutral and selected genomic regions for Mediterranean vs. Red Sea cornetfish individuals. We found that little neutral changes were detectable among populations. However, almost half of the genes associated with the 47 loci under selection were related to disease resistance and osmoregulation. Due to the short time elapsed from the beginning of the invasion to our sampling, we interpret these changes as signatures of pre-adaptation, where Red Sea individuals that carried those traits were primed to successfully invade the Mediterranean. Such genomic regions are therefore good candidates to further study their role in invasion success.
Bernardi, G., University of California Santa Cruz, USA, email@example.com
Azzurro, E., Institute for Environmental Protection and Research, Italy, firstname.lastname@example.org
Golani, D., The Hebrew University of Jerusalem, Israel
Miller, M. R., University of California Davis, USA, email@example.com
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