Functional,Phylogenetic and Host-Geographic Signatures of <Emphasis Type="Italic">Labyrinthula</Emphasis> spp. Provide for Putative Species Delimitation and a Global-Scale View of Seagrass Wasting Disease |
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| Authors: | Email author" target="_blank">Daniel?L?MartinEmail author Ylenia?Chiari Emily?Boone Timothy?D?Sherman Cliff?Ross Sandy?Wyllie-Echeverria Joseph?K?Gaydos Anne?A?Boettcher |
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| Institution: | 1.Biology Department,University of South Alabama,Mobile,USA;2.The SeaDoc Society, Karen C. Drayer Wildlife Health Center—Orcas Island Office,University of California at Davis,Eastsound,USA;3.Prescott,USA;4.Department of Biology,University of Richmond,Richmond,USA;5.Department of Biology,University of North Florida,Jacksonville,USA;6.Friday Harbor Laboratories,University of Washington,Friday Harbor,USA;7.Center of Marine and Environmental Studies, College of Science and Math,University of the Virgin Islands,Saint Thomas,USA;8.Embry-Riddle Aeronautical University,Prescott,USA |
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| Abstract: | Seagrass meadows form ecologically and economically valuable coastal habitat on every continental margin except the Antarctic, but their areal extent is declining by approximately 2–5 % per year. Seagrass wasting disease is a contributing factor in these declines, with the protist Labyrinthula identified as the etiologic agent. To help elucidate the role of Labyrinthula spp. in global seagrass declines, we surveyed roughly one fourth of all seagrass species to identify Labyrinthula diversity at the strain and/or species level, combining results from culturing methods and two common nuclear DNA markers: the ITS and 18S regions of the ribosomal RNA gene complex. After assaying a subset of the resulting isolates (of which 170 were newly sequenced), we produced a cladogenic context for putative seagrass-pathogenic versus non-pathogenic Labyrinthula while also defining host and geographic ranges. Assays also suggest that pathogenicity is consistently high (when present; and, even when comparing susceptibility of US East- versus West Coast Zostera marina hosts) while virulence is variable, that some isolate-host combinations have the potential for host cross-infection, and that several modes of transmission can be effective. Taken together, these data provide additional means for delimiting putative species of Labyrinthula, suggesting at least five seagrass-pathogenic and perhaps ten or more non-pathogenic marine “species”, yielding a working definition for ecologists and epidemiologists attempting to reconcile the sundry data related to seagrass wasting disease. |
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