Quantifying the historic contribution of Olympia oysters to filtration in Pacific Coast (USA) estuaries and the implications for restoration objectives
Quantifying the historic contribution of Olympia oysters to filtration in Pacific Coast (USA) estuaries and the implications for restoration objectives
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DOI：
10.1007/s10452-013-9431-6
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发表时间：
2013-06-01
期刊：
影响因子：
1.8
通讯作者：
Brumbaugh, R. D.
中科院分区：
文献类型：
--
作者：
Ermgassen, P. S. E. Zu;Gray, M. W.;Brumbaugh, R. D.
奥林匹亚牡蛎，Ostrea lurida Carpenter，以前广泛分布在美国太平洋沿岸的许多河口。继1800年代末和1900年代初急剧减少之后，该物种现在成为重新恢复工作的焦点。恢复是为了恢复亲鱼以及一系列生态系统服务，如过滤;然而，这些生态系统服务尚未得到很好的量化。我们提出了第一个实验室测量的过滤速率（FR）的O。lurida，其中我们拟合的模型FR作为干组织重量和水温的函数。我们发现O. lurida在最适温度下的FR与先前建立的牡蛎物种在1 g干组织重量（DTW）下的平均值相似，但低于许多Crassostrea物种。我们还发现O.比先前公布的各牡蛎品种的平均值低。根据我们推导出的过滤速率和历史数据，我们估计了O。在太平洋沿岸的五个河口。我们发现历史悠久的O。lurida种群没有能力在任何河口停留时间内过滤河口的全部体积。这一结果主要是由太平洋沿岸典型的低水温和短河口停留时间驱动的。我们的结论是，不同的Crassostrea virginica Gmelin在大西洋和墨西哥湾沿岸，奥林匹亚牡蛎在历史上是不是一个主导力量，在太平洋沿岸河口大规模调节悬浮物浓度。鉴于这两种牡蛎在生态作用和栖息地结构上的差异，我们建议谨慎地在它们之间进行类比。我们讨论了我们的研究结果对制定恢复目标的影响。
The Olympia oyster, Ostrea lurida Carpenter, was formerly widespread in many US Pacific coast estuaries. Following dramatic declines in the late 1800s and early 1900s, this species is now the focus of renewed restoration efforts. Restoration is undertaken for brood stock rehabilitation as well as a range of ecosystem services such as filtration; however, these ecosystem services are as yet poorly quantified. We present the first laboratory measurements of filtration rates (FR) for O. lurida, to which we fit a model of FR as a function of dry tissue weight and water temperature. We find that O. lurida has a FR at optimum temperature similar to previously established means across oyster species at 1 g dry tissue weight (DTW), but lower than many Crassostrea species. We also find that the allometric exponent relating FR to DTW in O. lurida is lower than the previously published mean across oyster species. Based on our derived filtration rates and historical data, we estimate the historic impact of filtration by O. lurida in five Pacific coast estuaries. We find that historic O. lurida populations did not have the capacity to filter the full volume of the estuary within the estuary residence time in any of the estuaries examined. This result is primarily driven by the low water temperatures and the short estuary residence times that typify the Pacific coast. We conclude that, unlike Crassostrea virginica Gmelin on the Atlantic and Gulf coasts, the Olympia oyster was not historically a dominant force in regulating seston concentrations at large scales in Pacific coast estuaries. Given the differences in the ecological role and habitat structure of these two oyster species, we recommend that analogies between them be drawn with caution. We discuss the implications of our results for developing restoration objectives.