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Phylogenetic Systematics of the Darter Subgenus Nothonotus (Teleostei: Percidae)

Robert M. Wood
Copeia
Vol. 1996, No. 2 (May 16, 1996), pp. 300-318
DOI: 10.2307/1446846
Stable URL: http://www.jstor.org/stable/1446846
Page Count: 19
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Phylogenetic Systematics of the Darter Subgenus Nothonotus (Teleostei: Percidae)
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Abstract

Allozyme variation at 38 presumptive gene loci was assayed for 24 populations representing 16 species of the percid subgenus Nothonotus. One behavioral and 11 morphological characters also were evaluated. Distance-Wagner, neighbor-joining, and character-based parsimony analysis were employed to generate trees from allozyme data. Nonallozyme data were analyzed in conjunction with allozyme data by using character-based parsimony. Most parsimonious solutions were chosen through FREQPARS optimization of all trees derived from distance-based analyses and of all equally most parsimonious trees resulting from character-based analyses. Results indicate that Nothonotus is monophyletic with respect to outgroup taxa analyzed. Two, near-equal most parsimonious solutions to the combined allozyme plus nonallozyme data sets were found: (E. juliae ((E. tippecanoe (E. rubrum, E. moorei)) (E. acuticeps (E. bellum ((E. camurum, E. chlorobranchium) (E. rufilineatum (E. jordani ((E. vulneratum, E. wapiti) (E. microlepum (E. aquali (E. sanguifluum, E. maculatum))))))))))); and (E. juliae ((E. tippecanoe (E. rubrum, E. moorei)) ((E. rufilineatum (E. bellum (E. camurum, E. chlorobranchium))) ((E. jordani, E. acuticeps) ((E. vulneratum, E. wapiti) (E. microlepidum (E. aquali (E. sanguifluum, E. maculatum)))))))). Both trees support existence of an upper Tennessee River/Mobile Basin connection. Hypothesized relationships in the E. maculatum species-group support a closer affinity of the Duck River to the Green and Cumberland rivers than to the Tennessee River system within the time frame relevant to speciation within this clade. Hypothesized relationships within the E. tippecanoe species-group suggest a continuous Ozarkian/Lower Mississippi River connection after the vicariant event separating the Eastern Highlands from the Interior Highlands.

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