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首页> 外文期刊>Marine ecology progress series >Benthic flow environments affect recruitment of Crassostrea virginica larvae to an intertidal oyster reef
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Benthic flow environments affect recruitment of Crassostrea virginica larvae to an intertidal oyster reef

机译：底栖水流环境影响潮州牡蛎向潮蟹的吸收

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Restoration efforts to enhance Crassostrea virginica oyster populations along the Virginia, USA, coastline focus on creating benthic habitat suitable for larval recruitment, survival, and growth. To determine how benthic flow processes affect larval recruitment, velocity and turbulence we collected data over multiple intertidal benthic surfaces including a mud bed, a C. virginica oyster reef, and 2 restoration sites comprised of deposited C. virginica oyster shell or the relatively larger Busycotypus canaliculatus whelk shell. Mean estimates of the drag coefficient, C_D, used as a measure of hydrodynamic roughness over the C. virginica reef were found to be 2 times greater than over the restoration sites and 5 times greater than over the mud bed. Enhanced fluid shear increased both peak Reynolds stresses and vertical momentum transport above the reef, but within the interstitial areas between individual oysters, velocities and turbulence were reduced. Larval settlement plates of varying triangular-shaped benthic roughness were used to mimic the natural topographic variability found along oyster reefs. The greatest larval recruitment occurred along interstitial regions between high-roughness topography, where shear stresses, which act to dislodge larvae, were found to be up to 20 times smaller than along exposed surfaces. Greater recruitment was also found on the more hydrodynamically rough whelk shell compared to the oyster shell restoration site. Results suggests that restoration efforts should consider creating 3-dimensional benthic topography similar to established oyster reefs to provide hydrodynamic conditions and settlement surfaces that promote larval recruitment, prevent burial by sediment, and provide refuge from predation.
机译：恢复努力以增加美国弗吉尼亚州沿岸的Crassostrea virginica牡蛎种群，海岸线的重点是创建适合幼体募集，生存和生长的底栖生境。为了确定底栖生物的流动过程如何影响幼虫的募集，速度和湍流，我们收集了多个潮间底栖生物的数据，包括泥浆床，维吉尼亚牡蛎礁和由沉积的维吉尼亚牡蛎壳或相对较大的Busycotypus组成的两个恢复点。小管螺壳。测得的阻力系数C_D的平均估计值被用作对维尔纽斯礁的水动力粗糙度的量度，该值比恢复位点大2倍，比泥床大5倍。增强的流体剪切作用会增加雷诺峰应力和礁石上方的垂直动量传输，但在各个牡蛎之间的间隙区域内，速度和湍流都会减小。使用具有不同三角形底栖粗糙度的幼虫沉降板来模拟沿牡蛎礁发现的自然地形变化。最大的幼虫募集发生在高粗糙度地形之间的间隙区域，在该间隙中，起到驱赶幼虫作用的剪应力比沿裸露表面小多达20倍。与牡蛎壳修复部位相比，在流体动力学更粗糙的螺壳上也发现了更大的吸收。结果表明，恢复工作应考虑建立类似于已建立的牡蛎礁的3维底栖地形，以提供流体动力学条件和沉降表面，从而促进幼体的募集​​，防止沉积物掩埋并提供避难所。

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