Genetic diversity and demographic history of Dosidicus gigas (Cephalopoda: Ommastrephidae) in the Humboldt Current System

摘要: During the late Pleistocene-Holocene, Humboldt Current System (HCS, Peru-Chile) was subject to important oceanographic variations that may have affected abundance and distri- bution of marine populations, as well their genetic structure diversity. The fast growth short life span jumbo squid Dosidicus gigas make this a valuable model organism for evalu- ating how environmental fluctuations affect diversity populations. We sequenced 657 bp fragment mtDNA cytochrome c oxidase I (COI) gene 169 squids from 6 locations in HCS. measured compared among localities per- formed neutrality tests detect deviation mutation-drift equilibrium. inferred demo- graphic history using Bayesian skyline analyses estimate effective population size through time. A total 23 haplotypes were found sequences. Haplotype nucleotide low all locations. D. characterized by an absence star-like haplotype network. Neutrality test values negative statistically sig- nificant, therefore consistent with past expansion. Similarly, indicated recent demographic expansion after last glacial maximum. Our results suggest consists single, large HCS, experienced dramatic popu lation changes associated glacial- interglacial transition.