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    Influence of Two Common Bryophytes on Acidity and Divalent Cation Concentrations in Standing Spring Water

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    Author
    Bland, Stephen N.
    Keyword
    Bryophytes
    Calcium
    Magnesium
    Manov A
    Ph Streams
    Date Published
    2002-04-15
    
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    URI
    http://hdl.handle.net/20.500.12648/6470
    Abstract
    This laboratory experiment examines the influence of two common mosses on the pH and solute dynamics of water from a spring brook. Bivariate analysis of variance tests (MANOVA) revealed significant changes in concentrations of H+ and the combined variable, divalent cations (Ca++ & Mg++) over a three week incubation period in microcosms containing Thuidium delicatulum and Brachythecium rivulare, mosses commonly found in low order woodland streams. Divalent cation concentrations in the presence of moss were 36% higher, on average, than in similar microcosms with moss absent. In microcosms containing decomposing wood, W concentrations were 15% lower in the presence of moss. There were approximately 7 mg of divalent cations in every gram of moss tissue (AFDM), while a gram of wood contained 1-2 mg of divalent cations, values similar to those reported elsewhere in the literature. I suggest reversed cation exchange is the mechanism responsible for elevated divalent cation concentrations and changes in solute dynamics. A hypothesis concerning expected responses of fungal enzymes to the observed changes in solute dynamics is discussed.
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