title: Discordant patterns of morphological and molecular change in broadtail madtoms (genus Noturus).
abstract: Two morphologically distinct forms of an undescribed madtom catfish (Noturus sp.) occur in the rivers and lakes of southeastern USA. 'Lake' broadtail madtoms are endemic to Lake Waccamaw and are probably related to nearby 'river' broadtail populations. To investigate phylogenetic relationships, we surveyed mitochondrial DNA (mtDNA) sequence variation in 'lake' and 'river' broadtails and other members of the genus Noturus. Mitochondrial rDNA data suggest a sister group relationship between broadtail madtoms and N. insignis, not N. leptacanthus as posited previously. Population-level analyses using additional mtDNA characters (NADH dehydrogenase subunit 2 (ND2) and cytochrome b (Cytb)) identified two highly divergent genetic lineages within broadtail madtoms that do not correspond to the morphological designations 'river' and 'lake'.
authors.affiliation: Department of Biological Sciences, University of South Carolina, Columbia 29208, USA.
authors.forename: R Q
authors.initials: RQ
authors.lastname: Bennetts
authors.forename: J M
authors.initials: JM
authors.lastname: Grady
authors.forename: F C
authors.initials: FC
authors.lastname: Rohde
authors.forename: J M
authors.initials: JM
authors.lastname: Quattro
mesh_terms: D000818:Animals; D001483:Base Sequence; D002397:Catfishes / Q000033:anatomy & histology / Q000145:classification* / Q000235:genetics*; D003573:Cytochrome b Group / Q000235:genetics; D004272:DNA, Mitochondrial / Q000235:genetics*; D004275:DNA, Ribosomal / Q000235:genetics*; D019143:Evolution, Molecular; D014644:Genetic Variation; D008969:Molecular Sequence Data; D009245:NADH Dehydrogenase / Q000235:genetics; D010802:Phylogeny; D012335:RNA, Ribosomal / Q000235:genetics; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D016415:Sequence Alignment; D012689:Sequence Homology, Nucleic Acid; D015144:Southeastern United States
chemical_list: D003573:Cytochrome b Group; D004272:DNA, Mitochondrial; D004275:DNA, Ribosomal; D012335:RNA, Ribosomal; D012336:RNA, Ribosomal, 16S; C075526:RNA, ribosomal, 12S; D009245:NADH Dehydrogenase