Journal Title
Title of Journal: Wetlands Ecol Manage
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Abbravation: Wetlands Ecology and Management
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Publisher
Springer Netherlands
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Authors: Sucharit Basu Neogi M Sirajul Islam G Balakrish Nair Shinji Yamasaki Rubén J Lara
Publish Date: 2012/01/26
Volume: 20, Issue: 3, Pages: 271-285
Abstract
Cholera epidemics are thought to be influenced by changes in populations of estuarine Vibrio cholerae We investigated the abundance and distribution of this bacterium as “freeliving” 20 μm fraction and associated with microphytoplankton 20 μm or zooplankton 60 μm in the Karnaphuli estuary of Bangladesh during pre and postmonsoon seasons Cultivable Vibrio populations were ~102–104 colony forming units CFU ml−1 in the high saline zone 19–23 practical salinity unit PSU and declined in freshwater 101 CFU ml−1 Culture independent detection of toxigenic V cholerae O1 and O139 serogroups revealed a higher abundance of “freeliving” 104–105 cells l−1 than those attached to plankton 101–103 cells l−1 However “freeliving” O1 and O139 cells were sometimes absent in the medium saline and freshwater areas 00–11 practical salinity unit PSU In contrast plankton samples always harbored these serogroups despite changes in salinity and other physicochemical properties Microphytoplankton and zooplankton were dominated by diatoms and bluegreen algae and copepods and rotifers respectively Toxigenic V cholerae abundance did not correlate with plankton abundance or species but had a positive correlation with chitin in the 20 μm fraction where suspended particulate matter SPM V cholerae and chitin concentrations were highest CN ratios indicated that organic matter in SPM originated predominantly from plankton The differential occurrence of “freeliving” and attached V cholerae suggests a pivotal function of plankton in V cholerae spreading into freshwater areas The probable association of this pathogen with organisms and particles in the nanoplankton 20 μm fraction requires validation of the concept of the “free living” state of V cholerae in aquatic habitatsThis study was performed in partial fulfillment of the requirements of a PhD thesis for SB Neogi from the Graduate School of Life and Environmental Sciences Osaka Prefecture University Osaka Japan We thank D Peterke and D Dasbach of ZMT Bremen Germany and members of the Environmental Microbiology Laboratory ICDDR B Dhaka Bangladesh for their kind support during sample collection and processing This collaborative research work was funded by grant LA 868/51 from DFG/BMZ Germany
Keywords:
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Other Papers In This Journal:
- A three-tiered framework to select, prioritize, and evaluate potential wetland and stream mitigation banking sites
- African wetlands and their seasonal use by wild and domestic herbivores
- Wetland hydrologic class change from prior to European settlement to present on the Des Moines Lobe, Iowa
- Assessing impacts of habitat modification on a subtropical salt marsh: 20 years of monitoring
- The implications of harvesting on the population structure and sediment characteristics of the mangroves at Mngazana Estuary, Eastern Cape, South Africa
- Spatial and temporal dynamics of diffusive methane emissions in the Okavango Delta, northern Botswana, Africa
- Tracking marsh restoration using macrobenthic metrics: implementing a functional approach
- Vegetation dynamics in the Bangladesh Sundarbans mangroves: a review of forest inventories
- Vegetation along hydrologic, edaphic, and geochemical gradients in a high-elevation poor fen in Canaan Valley, West Virginia
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