Dr. Steven L. Powers

Associate Professor
Department: Biology
Office: 213 Life Science
Phone: 375-4946

powers@roanoke.edu

Degrees:

Ph.D. University of Alabama
M.S. Eastern Kentucky University
B.S. Georgetown College

Course List

Research & Teaching Interests:

My primary research interest is the evolution and ecology of stream fishes of the southeastern United States. Not only are fishes inherently interesting due to their high level of diversity, range of evolutionary novelties, and varied ecologies, they are also excellent model organisms for investigating evolutionary processes. For many fishes, confinement to small streams and low dispersal capability provide a natural setting for investigating their interaction with ecological variables, modes of speciation and biogeographic patterns. Dramatic sexual dimorphism present in several groups of fishes also indicates that sexual selection has played a major role in their evolution. Furthermore, the physical constraints of living in stream habitats have influenced the evolution of stream fishes and the communities to which they belong. My research has specifically answered and continues to answer questions of evolution, ecology, biogeography, systematics, and conservation. To answer such a wide variety of questions, I have employed many techniques, including assessments of genetic differentiation, molecular and morphological phylogenetic systematics, quantifying stream habitat and community structure, quantifying life history characteristics, developing methods for bioassessments, and testing biogeographic hypotheses.

Recent Publications:

Powers, S. L. (In Press). Mugilidae: The Mullets. In: Warren, M. L, Jr. and B. M. Burr. Evolution and Ecology of North American Freshwater Fishes. Johns Hopkins Press.

Barton, S. D. and S. L. Powers. 2010. Life-history Aspects of the Cherokee Darter, Etheostoma scotti (Actinopterygii: Percidae), an Imperiled Species in Northern Georgia. Southeastern Naturalist. 9(4):687-698.

Holder, D. S. and S. L. Powers. 2010. Life-history aspects of the Rainbow Shiner, Notropis chrosomus (Actinopterygii: Cyprinidae) in Northern Georgia. Southeastern Naturalist. 9(2):347-358

Edberg, K. M. and S. L. Powers. 2010. Life-history aspects of the Southern Studfish, Fundulus stellifer (Actinopterygii: Fundulidae) in Northern Georgia. Southeastern Naturalist. 9(1):119-128.

Powers, S. L. and M. L. Warren, Jr. 2009. Phylogeography of Three Snubnose Darters (Percidae: subgenus Ulocentra) Endemic to the Southeastern U.S. Coastal Plain. Copeia 2009(3):523-528.

Jolly, D. M. and S. L. Powers. 2008. Life-history aspects of the Coosa Shiner, Notropis xaenocephalus (Actinopterygii: Cyprinidae) in Northern Georgia. Southeastern Naturalist 7(3):449-458.

O’Kelley, C. T. and S. L. Powers. 2007. Life-history aspects of the Alabama Hog Sucker, Hypentelium etowanum (Actinopterygii: Catostomidae) in Northern Georgia. Southeastern Naturalist. 6(3):479-490.

Powers, S. L. and R. L. Mayden. 2007. Evolution, systematics and biogeography of the Etheostoma simoterum species complex (Percidae: subgenus Ulocentra). Bulletin of the Alabama Museum of Natural History. 25:1-23.

Lang, N. J., S. L. Powers, and R. L. Mayden. 2005. Conservation status of undescribed madtoms of the Noturus elegans species complex in the Upper Tennessee River system. Southeastern Naturalist. 4(4):585-596.

Mayden, R. L. and S. L. Powers. 2004. Biochemical systematics and species diversity in the Macrhybopsis aestivalis species complex from Gulf Coastal Rivers, with comments on species relationships (Teleostei: Cyprinidae). In: Vilano, M. and A. Bladeras (eds.). Homanaje al Doctor Andres Resendez Medina, Un Ictiologo Mexicano. Universidad Autonoma de Neuvo Leon.

Powers, S. L., R. L. Mayden, and D. A. Etnier. 2004. Conservation genetics of the Ashy Darter, Etheostoma cinereum (Percidae: subgenus Allohistium), in the Cumberland and Tennessee rivers of the southeastern United States. Copeia. 2004(3):632-637.

Powers, S. L. and R. L. Mayden. 2003. Etheostoma cervus: a new species from the Forked Deer River System in western Tennessee with comparison to Etheostoma pyrrhogaster (Percidae: subgenus Ulocentra). Copeia. 2003(3):576-582.

Powers, S. L. 2003. Modification of Index of Biotic Integrity for Russell Fork of upper Big Sandy River system, Kentucky. Journal of the Kentucky Academy of Science. 64(1):6-11.

Powers, S. L., G. L. Jones, P. Redinger, and R. L. Mayden. 2003. Habitat associations with upland stream fish assemblages in Bankhead National Forest, Alabama. Southeastern Naturalist. 2(1):85-92.

Powers, S. L. and R. L. Mayden. 2002. Threatened fishes of the world: Etheostoma cinereum Storer, 1845 (Percidae). Environmental Biology of Fishes. 63:264.

Powers, S. L. and R. L. Mayden. 2002. Threatened fishes of the world: Percina aurolineata Suttkus & Ramsey, 1967 (Percidae). Environmental Biology of Fishes. 63:116.

Powers, S. L. and P. A. Ceas. 2000. Ichthyofauna and biogeography of Russell Fork (Big Sandy River - Ohio River). Southeastern Fishes Council Proceedings. 41:1-13.

Courses:

Vertebrate Biology, Aquatic Ecology, Biogeography and Systematics, How Do Living Organisms Evolve?

Available as a Media resource for the following topics:

Biodiversity, streams, non-game fishes

Willing to speak to professional, social or civic groups on:

Biodiversity, streams, non-game fishes