@article{lindstrom_blum_walter_gagne_gilliam_2012, title={Molecular and Morphological Evidence of Distinct Evolutionary Lineages of Awaous guamensis in Hawai'i and Guam}, ISSN={["1938-5110"]}, DOI={10.1643/ci-11-027}, abstractNote={Questions remain about the taxonomy and distribution of geographically widespread species in the circumtropical gobiid genus Awaous. Previous work that placed two species in synonymy on the basis of morphological characteristics effectively redefined the range of Awaous guamensis to include distant locations from Hawai'i and Guam to the islands of South-East Melanesia. Here we evaluate the synonymy of A. guamensis and A. stamineus through phylogeographic analysis of mitochondrial DNA sequence variation and morphological comparisons of Hawai'i and Guam populations. Phylogenetic assessments show clear separation of molecular characteristics, and morphological analyses illustrate statistically significant phenotypic differences indicating that the populations represent distinct evolutionary lineages. Based upon genetic, morphological, and geographic distributional differences, we recommend that Hawaiian populations be recognized as a distinct species, and reversion to the previous nomenclature of Awaous stamineus.}, number={2}, journal={COPEIA}, author={Lindstrom, Daniel P. and Blum, Michael J. and Walter, Ryan P. and Gagne, Roderick B. and Gilliam, James F.}, year={2012}, month={Jun}, pages={293–300} }
 @article{walter_blum_snider_paterson_bentzen_lamphere_gilliam_2011, title={Isolation and differentiation of Rivulus hartii across Trinidad and neighboring islands}, volume={20}, ISSN={["1365-294X"]}, DOI={10.1111/j.1365-294x.2010.04968.x}, abstractNote={Diversification of freshwater fishes on islands is considered unlikely because the traits that enable successful colonization—specifically, broad salinity tolerances and the potential for oceanic dispersal—may also constrain post‐colonization genetic differentiation. Some secondary freshwater fish, however, exhibit pronounced genetic differentiation and geographic structure on islands, whereas others do not. It is unclear what conditions give rise to contrasting patterns of differentiation because few comparative reconstructions of population history have been carried out for insular freshwater fishes. In this study, we examined the phylogeography of Hart’s killifish (Rivulus hartii) across Trinidad, with reference to neighboring islands and northern South America, to test hypotheses of colonization and differentiation derived from comparable work on co‐occurring guppies (Poecilia reticulata). Geographic patterns of mitochondrial DNA haplotype variation and microsatellite genotype variation provide evidence of genetic differentiation of R. hartii among islands and across Trinidad. Our findings are largely consistent with patterns of geographically structured ancestry and admixture found in Trinidadian guppies, which suggests that both species share a history of colonization and differentiation and that post‐colonization diversification may be more common among members of insular freshwater fish assemblages than has been previously thought.}, number={3}, journal={MOLECULAR ECOLOGY}, author={Walter, Ryan P. and Blum, Michael J. and Snider, Sunny B. and Paterson, Ian G. and Bentzen, Paul and Lamphere, Brad A. and Gilliam, James F.}, year={2011}, month={Feb}, pages={601–618} }