Toward a landscape approach in seagrass beds: using macroalgal accumulation to address questions of scale

SusanS.Bell; MargaretO.Hall; BradleyD.Robbins

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Toward a landscape approach in seagrass beds: using macroalgal accumulation to address questions of scale

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An experimental investigation of drift macroalgal accumulation in seagrass beds was conducted to determine if the relationship between passively dispersed plant structure and the spatial arrangement of rooted macrophytes differed when examined across two spatial scales. Experiments were performed from December 1992 to April 1993 at four different sites in Tampa Bay, Florida, utilizing artificial seagrass units (ASUs) of uniform shoot length and density but with different areal dimensions 1 m2(S) versus 4 m2(L). Drift macroalgae were also collected from 1 m×1 m plots of natural seagrass at each of the experimental sites from November 1990 to May 1992 to determine the relationship between macroalgal abundance and structural characteristics of natural seagrass. Disproportionately higher amounts of macroalgae were captured inLcompared toSplots suggesting that macroalgal accumulation does not scale up directly with the areal dimensions of ASU patches. Higher amounts of algae recovered inLplots is in accordance with patterns expected if algae accumulate in zones of attenuated water flow. Neither seagrass shoot density nor blade length could adequately describe the patterns of algal accumulation. These combined results suggest that explanations for trapping/retention of passively dispersed particles should extend beyond traditional measures of vegetation complexity

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《oecologia》 |1995年第2期|163-168|共页
作者
SusanS.Bell; MargaretO.Hall; BradleyD.Robbins;
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University of South Florida;

Florida Marine Research Institute;

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Toward a landscape approach in seagrass beds: using macroalgal accumulation to address questions of scale

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