A genetic approach to resolving taxonomic ambiguity among Pleurobema (Bivalvia : Unionidae) of the eastern Gulf coast

Citation
Kl. Kandl et al., A genetic approach to resolving taxonomic ambiguity among Pleurobema (Bivalvia : Unionidae) of the eastern Gulf coast, MALACOLOGIA, 43(1-2), 2001, pp. 87-101
Citations number
42
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Animal Sciences
Journal title
MALACOLOGIA
ISSN journal
0076-2997 → ACNP
Volume
43
Issue
1-2
Year of publication
2001
Pages
87 - 101
Database
ISI
SICI code
0076-2997(2001)43:1-2<87:AGATRT>2.0.ZU;2-J
Abstract
Freshwater mussels in the genus Pleurobema (Bivalvia: Uniondae) from the ea stern Gulf drainages of Florida, Georgia, and Alabama are variable concholo gically, and several taxonomic names have been applied to shell phenotypes. Clarification of the species status of these mussels is important because they are recognized as imperiled throughout their range, mainly due to habi tat destruction. Allozyme electrophoresis and restriction fragment length p olymorphisms (RFLPs) of the nuclear ribosomal array showed little genetic d ifferentiation among samples representing the phenotypes designated P. pyri forme and P. bulbosum, Partial DNA sequences of the mitochondrial cytochrom e c oxidase subunit 1 distinguished P reclusum from P. pyriforme and P. bul bosum. Genetic differentiation was observed between other Pleurobema specie s, specifically R strodeanum, P. clava, and P. sintoxia. Genetic evidence i ndicates that the eastern Gulf Coast Pleurobema (P. pyriforme and P. bulbos um) are a single species, P. pyriforme, with variable shell characteristics . Pleurobema reclusum is different genetically and may represent a distinct valid species, Pleurobema pyriforme is a federally endangered species. Alt hough we hesitate to call P. reclusum a distinct species because we were ab le to sequence DNA from only one individual, it is distinct genetically fro m P. pyriforme of the Apalachicola-Chattahoochee-Flint rivers basin and sho uld merit conservation status.