NUCLEAR AND MITOCHONDRIAL SEQUENCE DATA REVEAL AND CONCEAL DIFFERENT DEMOGRAPHIC HISTORIES AND POPULATION GENETIC PROCESSES IN CARIBBEAN REEF FISHES

摘要: Mitochondrial and nuclear sequence data should recover historical demographic events at different temporal scales due to differences in their effective population sizes substitution rates. This expectation was tested for two closely related coral reef fish, the tube blennies Acanthemblemaria aspera A. spinosa. These have similar life histories dispersal potentials, co-occur throughout Caribbean. Sequence one mitochondrial markers were collected 168 individuals across species' Caribbean ranges. Although both species shared a pattern of genetic subdivision, spinosa had 20-25 times greater nucleotide divergence among populations than all three markers. Substitution rates estimated using relaxed clock approach revealed that COI is evolving 11.2% pairwise per million years. rapid rate obscured signal old expansions species, which only recovered more slowly However, allowed recovery recent expansion corresponding period increased habitat availability. Only by combining we able complex history these fish.