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GEOGRAPHIC AND TEMPORAL ASPECTS OF MITOCHONDRIAL REPLACEMENT IN NOTHONOTUS DARTERS (TELEOSTEI: PERCIDAE: ETHEOSTOMATINAE).
Author(s) -
Keck Benjamin P.,
Near Thomas J.
Publication year - 2010
Publication title -
evolution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.84
H-Index - 199
eISSN - 1558-5646
pISSN - 0014-3820
DOI - 10.1111/j.1558-5646.2009.00901.x
Subject(s) - biology , introgression , mitochondrial dna , sympatry , clade , sympatric speciation , lineage (genetic) , phylogenetic tree , evolutionary biology , phylogeography , zoology , ecology , genetics , gene
A growing number of molecular studies have identified mitochondrial replacement among closely related animal species, but there has been limited investigation into the phylogenetic, geographic, and temporal patterns, especially in more inclusive clades. We present a phylogenetic analysis of DNA sequences collected from mitochondrial and nuclear genes sampled from all 20 species of the darter clade Nothonotus and reveal extensive mtDNA replacement in N. rufilineatus . Using phylogenetic trees, haplotype networks, analysis of molecular variance (AMOVAs), and distributions of minimum pairwise genetic distances, we discovered that the mtDNA of N. rufilineatus has been replaced by that of different sympatric species of Nothonotus in different river drainages. In the Cumberland River, N. rufilineatus populations were fixed for N. camurus mtDNA. In the upper Tennessee River, N. rufilineatus contained N. chlorobranchius and N. camurus mtDNA. Most surprising, our analyses indicated that N. rufilineatus has acted as a “conduit species,” facilitating the introgression of N. chlorobranchius mtDNA into N. camurus in the upper Tennessee River. We identified several potential mechanisms for the observed pattern of introgression, and suggest experiments to assess their relative contributions. Comparisons among darter subclades indicated that the mitochondrial lineage of the clade is most influential in determining if the lineage is a mitochondrial donor or recipient.