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首页> 外文期刊>Ecosystems >Rates of Sediment Resuspension and Erosion Following Green Turtle Grazing in a Shallow Caribbean Thalassia testudinum Meadow
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Rates of Sediment Resuspension and Erosion Following Green Turtle Grazing in a Shallow Caribbean Thalassia testudinum Meadow

机译：在绿色的乌龟在浅加油中，沉积物重新悬浮率和侵蚀侵蚀的速度

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Seagrass meadows buffer sediments against resuspension and erosion by reducing water velocity and attenuating wave energy, thereby promoting accumulation of sediment and associated carbon. Grazing by green turtles (Chelonia mydas) can significantly reduce the aboveground canopy in meadows. Increasing green turtle population sizes will return more seagrass areas to a naturally grazed state; however, it is not well understood how green turtle grazing will affect sediment processes in seagrass meadows. To evaluate effects of grazing, we measured sediment erosion following a clipping experiment in a shallow Caribbean Thalassia testudinum seagrass meadow and rates of sediment resuspension in an area naturally grazed by turtles. Following removal of the seagrass canopy, erosion of surface sediments did not increase compared to unclipped reference plots during the clipping experiment. We provide the first estimates of particle deposition and resuspension rates from a seagrass meadow grazed by green turtles. Rates did not differ between areas naturally grazed for at least one year and ungrazed areas. On average, 51% of the total sediment flux was comprised of resuspended sediments in the area grazed by turtles, and 52% in the ungrazed area of the meadow. Green turtle grazing also did not affect the carbon content of sediment particles or the downward carbon flux in the meadow. Our results demonstrate that grazing did not increase the vulnerability of surface sediments to loss in this system, and as green turtles recover, their natural grazing regime may not directly affect sediment processes contributing to carbon accumulation in shallow, coastal meadows.
机译：海草草甸通过减少水速度和衰减波能量，促进沉积物和相关碳的积累来缓冲沉积物的缓冲沉积物和腐蚀。掠过绿色的乌龟（Chelonia Mydas）可以在草地上显着减少地上冠层。增加绿龟口尺寸将会将更多的海草区域归还为天然放牧的国家;然而，它尚不清楚绿龟牧草将如何影响海草草甸的沉积过程。为了评估放牧的效果，我们在浅滩上的剪裁实验后测量了沉积物侵蚀，在浅加油Thalassia testudinum海草草甸和沉积物重新悬浮率，在海龟自然留下的区域。在去除海草冠层之后，与剪切实验期间与未剥夺的参考图相比，表面沉积物的侵蚀没有增加。我们提供了由绿色乌龟放牧的海草草甸的粒子沉积和重新悬浮率的第一个估计。在至少一年和未加工的地区自然地区的地区之间没有差异没有差异。平均而言，51％的总沉积物助焊剂由海龟放牧的区域中重悬的沉积物组成，并且在草地的未甲状腺区域内的52％。绿龟放牧也没有影响沉积物颗粒的碳含量或草甸的下碳通量。我们的结果表明，放牧并未增加表面沉积物在该系统中损失的脆弱性，并且随着绿色的乌龟恢复，他们的自然放牧制度可能不会直接影响沉积过程，导致浅层沿海地区的碳积累有助于碳积累。

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