Presentations at meetings, 1978 - 2013.
R. T. Dillon

2013.  Dillon, R. T., S. Jacquemin and M. Pyron.  Phenotypic plasticity in the freshwater gastropod genus Pleurocera: Extreme, cryptic, or both?  Society for Freshwater Science (Formerly NABS), Jacksonville, FL.

2013.  Dillon, R. T.  The freshwater gastropods of the Chesapeake Bay watershed: An interim report.  Chesapeake Bay Freshwater Mollusk Workgroup, Annapolis, MD.

2012.  Dillon, R. T., S. Jacquemin, and M. Pyron.  Pleurocera acuta (Raf. 1824) and P. pyrenellum (Conrad 1834) are small-stream ecophenotypic morphs of P. canalculata (Say 1821).  American Malacological Society, Cherry Hill, NJ.

2011.  Dillon, R. T. and J. D. Robinson.  When cometh our reformation?  Molecular typology meets population genetics in the pleurocerid gastropod fauna of east Tennessee.  Invited symposium address - American Malacological Society, Pittsburgh, PA.

2011.  Dillon, R. T., A. R. Wethington and C. Lydeard.  The evolution of reproductive isolation in a simultaneous hermaphrodite, the freshwater snail Physa.  American Malacological Society, Pittsburgh, PA.

2011.  Dillon, R. T.  Robust shell phenotype is a local response to stream size in the genus Pleurocera.  Freshwater Mollusk Conservation Society, Louisville, KY.

2009.  Dillon, R. T. and J. D. Robinson.  The Opposite of Speciation: Genetic relationships among the populations of Goniobasis ("Elimia") in central Georgia.  Invited symposium address - American Malacological Society, Ithaca, NY.  

2009.  Dillon, R. T.  Genetic divergence among populations of pleurocerid snails inhabiting rivers of the Southern Appalachians: Evidence of a two-stage process.  Invited symposium address - North American Benthological Society, Grand Rapids, MI.

2008.  Herman, J. J. and R. T. Dillon.  Genetics, shell morphology, and life history of the freshwater pulmonate limpets Ferrissia rivularis and F. fragilis.  [Poster] American Malacological Society, Carbondale, IL.

2008.  Dillon, R. T. and J. D. Robinson.  Extreme intrapopulation sequence divergence suggests an ancient origin for the pleurocerid snails of the southern Appalachians.  American Malacological Society, Carbondale, IL.

2007.  Herman, J. J. and R. T. Dillon.  Life history, shell morphology, and genetic variation in the freshwater limpets Ferrissia rivularis and F. fragilis.  [Poster]  Sigma Xi student research conference, Orlando, FL.

2006.  Dillon, R. T. and J. D. Robinson.  Genetic relationships among populations of Goniobasis ("Elimia") from central Georgia.  American Malacological Society, Seattle, WA.

2005.  Dillon, R. T., J. D. Robinson and A. R. Wethington.  Empirical estimates of reproductive isolation among the freshwater pulmonate snails Physa acuta, P. pomilia, and P. hendersoni.  American Malacological Society, Asilomar, CA.

2004.  DeNitto, N. W., R. C. Frankis and R. T. Dillon.  Extensive mitochondrial CO1 sequence diversity in a population of the freshwater snail, Physa: Admixture or cryptic speciation?  [Poster] American Malacological Society, Sanibel, FL.

2004.  Robinson, J. D., R. T. Dillon, T. P. Smith and A. R. Wethington.  No reproductive isolation between the freshwater pulmonate snails Physa virgata and P. acuta.  American Malacological Society, Sanibel, FL.

2004.  Dillon, R. T. and P. D. Johnson.  Population genetic survey of the pleurocerid genus Lithasia in the Duck River of central Tennessee.  American Malacological Society, Sanibel, FL.

2004.  Drennan, R. H. and R. T. Dillon.  No evidence of sperm sharing in the freshwater pulmonate Physa acuta.  [Poster]  American Malacological Society, Sanibel, FL.

2004.  Dillon, R. T.  The biological species concept and the conservation of freshwater gastropods.  Invited presentation, Conservation Genetics Workshop on Imperiled Freshwater Mollusks and Fishes.  Freshwater Mollusk Conservation Society, Shepherdstown, WV. 

2004.  Dillon, R. T.  Freshwater gastropod distribution and ecology. Invited presentation, Water Quality Conference and Freshwater Snail Workshop.  Freshwater Mollusk Conservation Society, Tuscaloosa, AL.

2003.  Dillon, R. T., T. E. McCullough, and C. E. Earnhardt.  The Leaky Faucet Model: A direct estimate of self-fertilization rate in a natural population of the freshwater snail, Physa acuta.  American Malacological Society, Ann Arbor, MI.

2003.  Dillon, R. T., and R. C. Frankis.  High levels of mitochondrial DNA sequence divergence in isolated populations of the freshwater snail, Goniobasis.  Freshwater Mollusk Conservation Society, Durham, NC.

2003.  Stewart, T. W., and R. T. Dillon.  Taxonomic composition and geographic distribution of Virginia's freshwater gastropod fauna: A review using historical records.  Freshwater Mollusk Conservation Society, Durham, NC.

2003.  Wethington, A. R., R. T. Dillon, J. M. Rhett, and C. Lydeard.  Tracking the evolutionary legacy of the biologically invasive cosmopolitan species - Physa acuta.  Freshwater Mollusk Conservation Society, Durham, NC.

2002.  Cowie, R. H., D. G. Robinson, and R. T. Dillon.  The AMS list of unwanted alien snails in the USA: progress report.  American Malacological Society.  Charleston, SC.

2002.  Wise, J., M. G. Harasewych, and R. T. Dillon.  COI, allozyme, and morphological survey of the sinistral Busycon of North America.  American Malacological Society.  Charleston, SC.

2002.  Smith, T. P., A. R. Wethington and R. T. Dillon.  Evidence of social facilitation from interspecific crosses in Physa.  American Malacological Society.  Charleston, SC.

2002.  Stewart, T.W., and R. T. Dillon.  Geographic distribution and conservation status of Virginia’s freshwater gastropods.  American Malacological Society.  Charleston, SC.

2002.  Wethington, A. R., R. T. Dillon, R. Guralnick and C. Lydeard.  Delimiting species boundaries in the cosmopolitan freshwater snail, Physa (Physella) acuta group.  Society for the Study of Evolution.  Champaign-Urbana, IL.

2001.  Dillon, R.T., A.R. Wethington, J.M. Rhett and T.P. Smith.  Populations of the European freshwater pulmonate Physa acuta are not reproductively isolated from American Physa heterostropha or Physa integra.  American Malacological Society, meeting with the World Congress of Malacology.  Vienna, Austria.

2001.  Wethington, A.R., R.T. Dillon, J. M. Rhett and C. Lydeard.  Allozyme, 16s, and COI sequence divergence among populations of the cosmopolitan freshwater snail, Physa acuta.  American Malacological Society, meeting with the World Congress of Malacology.  Vienna, Austria.

2001.  Dillon, R.T.  and A. J. Reed.  A survey of allozyme variation among Goniobasis populations inhabiting Atlantic drainages of the southeastern United States.  Freshwater Mollusk Conservation Society.  Pittsburgh, PA.

2000.  Dillon, R.T.  Sex ratio variation among populations of the freshwater snail, Goniobasis proxima.  American Malacological Society.  San Francisco, CA.

2000.  Dillon, R.T.  Evidence for density dependence in long-term censuses of freshwater mollusks.  North American Benthological Society.  Keystone, CO.

1999.  Wethington, A. R., E. R. Eastman, and R. T. Dillon.  Tests for sexual isolation among populations of a simultaneous hermaphrodite, the freshwater snail Physa.  Freshwater Mollusk Conservation Society.  Chattanooga, TN.

1999.  Dillon, R. T., and E. P. Keferl.  Survey of the pleurocerid snails of South Carolina.  Freshwater Mollusk Conservation Society.  Chattanoonga, TN.

1998.  Wethington, A.R., and R. T. Dillon.  Gender choice and gender conflict in Physa.  American Malacological Union, meeting with the World Congress of Malacology.  Washington, D.C.

1998.  Dillon, R.T.  The USR model of Life History Evolution in freshwater mollusks.  American Malacological Union, meeting with the World Congress of Malacology.  Washington, D.C.

1998.  Wise, J., R. T. Dillon, and M. G. Harasewych.  Morphological, allozyme, and RAPD survey of the sinistral Busycon of North America.  American Malacological Union, meeting with the World Congress of Malacology.  Washington, D.C.

1998.  Dillon, R. T.  A time series analysis of larval survivorship at the CMI scallop farm, Bahia Inglesa, Chile.  National Shellfisheries Association, joint meeting with "Aquaculture 98."  Las Vegas, NV.

1997. Dillon, R. T. A biogeographic analysis of freshwater mollusk diversity. North American Benthological Society.  San Marcos, TX.

1997. Dillon, R. T. Allozyme frequencies and hard clam populations: The origin of the world's oldest hybrid zone. Invited symposium address, South Carolina Statewide Research Conference. Isle of Palms, SC.

1996. Dillon, R. T. The heritability of shell metrics in the freshwater snail, Physa heterostropha. Society for the Study of Evolution.  St. Louis, Mo.

1996. Rosebrock, C., and R. T. Dillon. Individual instruction: A comparison of long-term trends in four science departments. South Carolina Academy of Sciences.  Charleston, SC.

1995. Geiger, G. L., and R. T. Dillon. Map distances between three chromosome two loci in Drosophila melanogaster, as estimated from 20 semesters of ugly data. South Carolina Academy of Sciences. Greenville, SC.

1995. Austin, J. R., and R. T. Dillon. Genetic association between ulcerative colitis and GM/KM allotypes in two Japanese populations. South Carolina Academy of Sciences. Greenville, SC.

1994. Dillon, R.T., and A.R. Wethington. Population genetics of the freshwater snail, Physa heterostropha: Are estuaries barriers to dispersal? North American Benthological Society. Orlando, Fl.

1994. Dillon, R.T., and N.H. Hadley. Rapid morphometric discrimination between the hard clams Mercenaria mercenaria, Mercenaria campechiensis, and their hybrids. National Shellfisheries Association. Charleston, SC.

1994. Wethington, A.R., and R.T. Dillon. Selfing and outcrossing the the pulmonate snail, Physa heterostropha: estimates of absolute fitness. Society for the Study of Evolution. Athens, Ga.

1994. Dillon, R.T., and N.S. Dayan. The population genetics of Littorina irrorata: Is Florida the boundary it seems? Invited symposium address, American Malacological Union. Houston, Texas.

1993. Dillon, R.T., and A. R. Wethington. Albinism, isozymes, and the search for sperm "sharing" in the hermaphroditic freshwater snail, Physa. Society for the Study of Evolution. Snowbird, Utah.

1993. Dillon, R.T., and J. J. Manzi. Ranking bivalve broodstocks by progeny testing in commercial aquaculture. World Aquaculture Society (U.S. Chapter) / South Atlantic Aquaculture Conference. Hilton Head, S.C.

1992. Wethington, A.R., and R.T. Dillon. Reproductive development in the hermaphroditic freshwater snail, Physa, monitored with complementing albino lines. American Malacological Union, Sarasota, FL.

1992. Bradley, R.J., A.R. Wethington, and R.T. Dillon. The inheritance of pigmentation in the freshwater snail, Physa. SC Academy of Sciences, Conway.

1992. Eastman, E.R., A.R. Wethington, and R.T. Dillon. No premating reproductive isolation in Physa. SC Academy of Sciences, Conway.

1992. Wethington, A.R., and R.T. Dillon. Timing of reproductive development in Physa. SC Academy of Sciences, Conway.

1991. Dillon, R.T. Pleurocerid snails. Atlantic slope freshwater mollusk conservation workshop. U.S. Fish & Wildlife Service, Arlington, Va.

1991. Hadley, N.H., and R.T. Dillon. Determination of "best parents" in a spawning of hard clams by comparison of parental and progeny genotypes at six enzyme loci. National Shellfisheries Association, Portland, Me.

1991. Dillon, R.T. Reproductive isolation between natural populations of the northern quahog, Mercenaria mercenaria, and the southern quahog, M. campechiensis, in South Carolina. National Shellfisheries Association, Portland, Me.

1991. Hadley, N.H., and R.T. Dillon. Choosing hatchery broodstock. South Atlantic Regional Aquaculture Conference, Hilton Head, SC.

1990. Dillon, R.T., and A. R. Wethington. Sperm storage and multiple insemination in a natural population of the freshwater snail, Physa heterostropha. Invited symposium address - American Malacological Union, Woods Hole, Mass.

1989. Dillon, R.T., and J. J. Manzi. Reproductive isolation between hard clams, M. mercenaria and M. campechiensis, in the Indian River Lagoon, Florida. Joint meeting of the National Shellfisheries Association, World Aquaculture Society, and several others ("Aquaculture `89"), Los Angeles, Ca.

1989. Manzi, J.J., N.H. Hadley, and R.T. Dillon. Selection for rapid growth in the hard clam, Mercenaria mercenaria. "Aquaculture `89", Los Angeles, Ca.

1988. Harris, S.E.G., R.T. Dillon, P.A. Sandifer, and L. J. Lester. Electrophoresis of isozymes in cultured Penaeus vannamei. Poster - International Association for Genetics and Aquaculture, Trondheim, Norway.

1988. Dillon, R.T. and K. B. Davis. The diatoms ingested by diverse freshwater snails co-occurring in a small mountain river. Amer. Malacological Union. Charleston, SC.

1988. McLean, D.C., R.T. Dillon, and J.J. Manzi. Variations in allelic frequencies in juveniles of the hard clam, M. mercenaria. National Shellfisheries Association, New Orleans, La.

1988. Manzi, J.J., N. H. Hadley, and R.T. Dillon. Selective breeding for rapid growth in M. mercenaria: Early growth and survival of high and mean-selected lines. National Shellfisheries Association, New Orleans, La.

1988. McLean, D.C., R.T. Dillon, and J.J. Manzi. Poster - Variations in allelic frequencies in juveniles of the hard clam, M. mercenaria. American Association for the Advancement of Science, Boston, Mass.

1988. Manzi, J.J., N.H. Hadley, and R.T. Dillon. Applied breeding of the hard clam, Mercenaria: Results of outcrossing selected commercial hatchery stocks. World Aquaculture Society, Honolulu, Ha.

1987. Dillon, R.T. and J.J. Manzi. Heterozygosity, growth, and linkage disequilibrium in hybrid populations of M. mercenaria. Invited symposium address - National Shellfisheries Association, Halifax, N.S.

1987. Dillon, R.T., and J.J. Manzi. Outcrossing selected lines of the hard clam, M. mercenaria. Invited symposium address - USA/Japan Natural Resources Panel on Aquaculture, Charleston, SC.

1986. Dillon, R.T. "Degree of speciation" estimated using artificial introductions and isozyme markers. Society for the Study of Evolution, Durham, N.H.

1986. Manzi, J.J., N.H. Hadley, and R.T. Dillon. Improved stocks of hard clams (Mercenaria spp.) through genetic manipulation. National Shellfisheries Association, Seattle, Wa.

1986. Dillon, R.T. and J.J. Manzi. Hybridization of hard clam (M. mercenaria) broodstocks II. Relationship between size and genotype. World Mariculture Society, Reno, Nv.

1986. Manzi, J.J., N.H. Hadley, and R.T. Dillon. Progress of genetic research on Mercenaria spp. at the SC Marine Resources Research Institute. Sixth Annual Shellfish Biology Seminar, Milford, Ct.

1985. Dillon, R.T. A new Monte Carlo method for assessing taxonomic similarity within faunal samples: Reanalysis of the gastropod community of Oneida Lake, NY. Invited symposium address - American Malacological Union, Kingston, RI.

1985. Manzi, J.J., N.H. Hadley, A.R. Eversole, and R.T. Dillon. Preliminary results from a hard clam, M. mercenaria, breeding program to improve stocks for commercial mariculture. Poster - National Shellfisheries Association, Norfolk, Va.

1984. Dillon, R.T. Artificial introductions used to assess gene flow potential within and between populations of the freshwater snail, Goniobasis proxima. American Malacological Union, Norfolk, Va.

1982. Dillon, R.T. What shall I measure on my snails? Allozyme data and multivariate analysis used to evaluate the genetic component of morphological variables in Goniobasis proxima. Invited symposium address - American Malacological Union, New Orleans, La.

1981. Dillon, R.T. Evolution at the octopine dehydrogenase locus in a linear population of the freshwater snail, Goniobasis proxima: A two-year report. American Malacological Union, Ft. Lauderdale, Fl.

1979. Dillon, R.T. An electrophoretic and shell morphometric survey of Goniobasis from the upper New River and surrounding drainages. American Malacological Union, Corpus Christi, Tx.

1978. Dillon, R.T. Multivariate analysis of structure in a freshwater gastropod community: preliminary results. American Malacological Union, Wilmington, NC.


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