David B. Mark Welch

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BACKGROUND Marine microbial communities have been essential contributors to global biomass, nutrient cycling, and biodiversity since the early history of Earth, but so far their community distribution patterns remain unknown in most marine ecosystems. METHODOLOGY/PRINCIPAL FINDINGS The synthesis of 9.6 million bacterial V6-rRNA amplicons for 509 samples(More)
The taxon Syndermata comprises the biologically interesting wheel animals ("Rotifera": Bdelloidea + Monogononta + Seisonidea) and thorny-headed worms (Acanthocephala), and is central for testing superordinate phylogenetic hypotheses (Platyzoa, Gnathifera) in the metazoan tree of life. Recent analyses of syndermatan phylogeny suggested paraphyly of(More)
The human mouth is an excellent system to study the dynamics of microbial communities and their interactions with their host. We employed oligotyping to analyze, with single-nucleotide resolution, oral microbial 16S ribosomal RNA (rRNA) gene sequence data from a time course sampled from the tongue of two individuals, and we interpret our results in the(More)
  • Scott Mills, J. Arturo Alcántara-Rodríguez, Jorge Ciros-Pérez, Africa Gómez, Atsushi Hagiwara, Kayla Hinson Galindo +17 others
  • 2016
Understanding patterns and processes in biological diversity is a critical task given current and rapid environmental change. Such knowledge is even more essential when the taxa under consideration are important ecological and evolutionary models. One of these cases is the monogonont rotifer cryptic species complex Brachionus plicatilis, which is by far the(More)
  • Lokendra Sharma, Yidong Bai, Ching-Heng Chou, James Bain, Gerda Fillenbaum, Carl Pieper +162 others
  • 2015
Leber's Hereditary Optic Neuropathy (LHON) is a neurodegenerative mitochondrial disease characterized by retinal ganglionic cell death and eventual loss of central vision. Specific mtDNA mutations in respiratory complex I subunits (ND4/ND6/ND1) coding genes have been identified in most of LHON patients, and these mutations have been shown to cause(More)
Comparative biogerontology has much to contribute to the study of aging. A broad range of aging rates have evolved to meet environmental challenges, and understanding these adaptations can produce valuable insights into aging. The supra Phylum Lophotrochozoa is particularly understudied and has several groups that have intriguing patterns of aging. Members(More)
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