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Bioinformatic Development: As Chair of the Bioinformatics and Biocomputational Support Group at the Josephine Bay Paul Center, overseeing the development and maintenance of bioinformatic and biocomputational resources; writing shell and perl scripts for data processing and analysis for a wide variety of projects in the Center, including tag pyrosequencing projects; and training graduate students, postdoctoral scientists, visiting scientists, and faculty in phylogenetics, bioinformatics, and computational biology.
Teaching: Teaching assistant in nine classical and molecular genetics courses, including six years as Head Teaching Fellow of genetics courses (100-350 students; administering 5-15 teaching assistants) at Harvard. Helped design and implement a new introductory genetics course required of all biology concentrators at Harvard, including designing lab experiments and writing the laboratory manual. Supervised eight undergraduate honors thesis research projects, four REU summer student projects, ten graduate student rotation projects, and two visiting graduate students; currently serving on one graduate student thesis committee and supervising one postdoctoral scientist.
Service. Referee of grants for the NSF (Division of Environmental Biology), NIH (Minority Biomedical Research), ESF (Young Investigators Program), and the New Zealand Academy of Sciences (Marsden Fund); referee of manuscripts for Acta Zoologica Sinica, Astrobiology, Biological Journal of the Linnean Society, BMC Evolutionary Biology, Diversity and Distribution, Evolution, Hydrobiologia, Journal of Biogeography, Journal of Evolutionary Biology, Journal of Molecular Evolution, Molecular Biology and Evolution, Molecular Phylogenetics and Evolution, Nature Reviews Genetics, Oecologia, PLoS Biology, PLoS ONE, Proceedings of the National Academy of Sciences, Proceedings of the Royal Society, Science, Zoological Scripta. Member of the Scientific Council, IV Plankton Symposium, Joćo Pessoa, Brasil, April 2007.
Seminars and Lectures: In addition to dozens of university seminars and oral presentations at professional meetings, invited conference particpation has included: IXth International Rotifer Symposium, Khon Kaen, Thailand (2000); International Symposium on the Evolution of Sex in Memory of W.D. Hamilton, Kyushu, Japan (2000); VIIIth Congress of the European Society for Evolutionary Biology, Aarhus, Denmark (2001); Royal Entomological Society-Linnean Society Symposium on Intraclonal Genetic Variation, London (2002); European Science Foundation Parthenogenesis Network Workshop, Wageningen, the Netherlands (2003); Gordon Research Conference on Meiosis (2006); Wenner-Gren Foundation Meeting on Mutation, Selection, and Genome Evolution, Stockholm (2006); and the 3rd International Apomixix Conference, Wernigrode, Germany (2007).
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Mark Welch, D.B.: Evidence from a protein coding gene that acanthocephalans are rotifers, Invert. Biol. 111:17-23 (2000).
Mark Welch, D.B. and M. Meselson: Evidence for the evolution of bdelloid rotifers without sexual reproduction or genetic exchange, Science 288:1211-1215 (2000).
D.B. Mark Welch: Early contributions of phylogenetics to understanding the evolution of Rotifera, Hydrobiologia 446/447:315-322 (2001).
Mark Welch, D.B. and M. Meselson: Rates of nucleotide substitution in sexual and anciently asexual rotifers, Proceedings of the National Academy of Sciences (USA) 98:6720-6724 (2001).
Mark Welch, D.B. and M. Meselson: A survey of introns in three genes of rotifers, Hydrobiologia 446/447:333-336 (2001).
Mark Welch, D.B.: Rotifera, in McGraw-Hill Yearbook of Science and Technology, McGraw-Hill, New York, NY, 304-306 (2002).
Mark Welch, D.B. and M. Meselson: Oocyte nuclear DNA content and GC proportion in rotifers of the anciently asexual Class Bdelloidea, Biological Journal of the Linnean Society 79:85-91 (2003).
Mark Welch, D.B., M.P. Cummings, D.M. Hillis, and M. Meselson: Divergent gene copies in the asexual class Bdelloidea (Rotifera) separated before the bdelloid radiation or within bdelloid families, Proceedings of the National Academy of Sciences (USA) 101:1622-1625 (2004).
Mark Welch, J.L., D.B. Mark Welch, and M. Meselson: Cytogenetic evidence for asexual evolution of bdelloid rotifers, Proceedings of the National Academy of Sciences (USA) 101:1618-1621 (2004).
Mark Welch, D. B. Bayesian and maximum likelihood analysis of rotifer-acanthocephalan relationships. Hydrobiologia 546: 47-54 (2005).
Mark Welch, D. B. and J. L. Mark Welch. 2005. Genomic approaches to rotifer ecology. Hydrobiologia 546: 101-108 (2005).
Sogin, M.L., H.G. Morrison, J.A. Huber, D Mark Welch, S.M. Huse, P.R. Neal, J.M. Arrieta, and G.J. Herndl. Microbial diversity in the deep sea and the underexplored "rare biosphere." Proceedings of the National Academy of Sciences (USA) 103: 1211512120 (2006).
Ekanayake, D.K., D.B. Mark Welch, R. Kieft, S. Hajduk, and W.P.J. Dittus. 2007.
Transmission dynamics of Cryptosporidium infection in a natural population of non-human primates at Polonnaruwa, Sri Lanka.
Am. J. Trop. Med. Hyg. 77 (5): 818-822.
Suga, K., D. B. Mark Welch, Y. Tanaka, Y. Sakakura, and A. Hagiwara. 2007. Analysis of expressed sequence tags of the cyclically parthenogenetic rotifer Brachionus plicatilis. PLoS ONE 2(8): e671.
Huse, S.M., J.A. Huber, H.G. Morrison, M.L. Sogin, and D.B. Mark Welch. 2007. Accuracy and quality of massively parallel pyrosequencing. Genome Biology 8: R143.
Huber, J.A.,
D.B. Mark Welch,
H.G. Morrison,
S.M. Huse,
P.R. Neal,
D.A. Butterfield, and
M.L. Sogin. 2007.
Microbial population structures in the deep marine biosphere.
Science
318: 97-100.
Mark Welch, D.,
Mark Welch, J.,
Meselson, M., 2008.
Evidence for degenerate tetraploidy in bdelloid rotifers.
Proceedings of the National Academy of Sciences
10.1073/pnas.0800972105.
Koushirou Suga,
David B. Mark Welch,
Yukari Tanaka, Yoshitaka Sakakura,
and Atsushi Hagiwara, 2008.
Two Circular Chromosomes of Unequal Copy Number Make Up the Mitochondrial Genome of the Rotifer Brachionus plicatilis.
Molecular Biology and Evolution
2008 25: 1129-1137; doi:10.1093/molbev/msn058.
Non-Peer Reviewed Publications:
Meselson, M.
and
D.B. Mark Welch. 2007. Stable heterozygosity?
Science 318: 202-203.
Mark Welch, D.B. Bdelloidea, In: McGraw-Hill Encyclopedia of Science and Technology, 10th Edition (in press).
Mark Welch, D.B. Monogononta, In: McGraw-Hill Encyclopedia of Science and Technology, 10th Edition (in press).
Mark Welch, D.B. Rotifera, In: McGraw-Hill Encyclopedia of Science and Technology, 10th Edition (in press).
Mark Welch, D.B., C. Ricci, and M. Meselson. Bdelloid rotifers: ecology, physiology, and genome evolution of a successful asexual, In: Lost Sex: The Evolutionary Biology of Parthenogenesis, K. Martens and I. Shoen, eds. Springer-Verlag, Heidelberg (in revision).
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