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首页> 外文期刊>Marine ecology progress series >Limits to top-down control of phytoplankton by oysters in Chesapeake Bay
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Limits to top-down control of phytoplankton by oysters in Chesapeake Bay

机译：切萨皮克湾对牡蛎自上而下控制浮游植物的限制

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Restoration of the oyster Crassostrea virginica population in Chesapeake Bay is often advocated as an easy solution for controlling phytoplankton blooms. Even at their pre-colonial densities, oysters are unlikely to have controlled blooms, despite the fact that sediment cores suggest that pre-colonial spring blooms were smaller than at present. Lack of access to all bay water and low springtime filtration rates would make it impossible for oysters to control the spring bloom and the resulting summer hypoxia. Previous studies have overestimated potential oyster filtration rates, because they extrapolated summer rates to spring conditions that are 20℃ cooler. Previous studies have also assumed that oysters have access to all phytoplankton, without considering the spatial separation. In Chesapeake Bay, oysters and the spring bloom are separated horizontally owing to the size of the bay and its small tidal amplitude. Indeed, a multi-species guild of suspension feeders now present in the bay should have a filtration capacity approaching that of pre-colonial oysters, but it does not control the bloom. Actual oyster filtration potential must be lower than many advocates of oyster restoration assume, and replenishing the bay with oysters is not the means of controlling blooms and hypoxia.
机译：切萨皮克湾的牡蛎Crassostrea virginica种群恢复通常被认为是控制浮游植物开花的简便方法。牡蛎即使在其前殖民地密度下也不太可能控制花开，尽管事实是沉积物的核心表明牡蛎的前花期比现在小。缺乏获得所有海湾水的能力以及春季过滤率低将使牡蛎无法控制春季开花和由此导致的夏季缺氧。以前的研究高估了牡蛎的潜在过滤速率，因为他们将夏季的速率推断为凉爽20℃的春季条件。先前的研究还假设牡蛎可以使用所有浮游植物，而无需考虑空间分隔。在切萨皮克湾，由于海湾的大小和潮汐幅度小，牡蛎和春暖花开水平分开。的确，现在海湾中存在的悬浮饲养者的多物种行会的过滤能力应接近殖民地牡蛎之前的水平，但不能控制水华。实际的牡蛎过滤潜能必须低于许多牡蛎恢复倡导者所假定的，并且用牡蛎补充海湾并不是控制水华和缺氧的手段。

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