Diet of the eastern oyster, Crassostrea virginica, growing in a eutrophic tributary of Chesapeake Bay, Maryland, USA
Diet of the eastern oyster, Crassostrea virginica, growing in a eutrophic tributary of Chesapeake Bay, Maryland, USA
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DOI：
10.1016/j.aqrep.2021.100655
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发表时间：
2021-03-10
影响因子：
3.7
通讯作者：
Glibert, Patricia M.
中科院分区：
文献类型：
--
作者：
Weissberger, Eric J.;Glibert, Patricia M.
在美国马里兰州切萨皮克湾富营养化支流罗德河中，对东北牡蛎的摄食选择性进行了为期2年的研究。一个子集的实验悬浮牡蛎每月收集和环境参数同时测量。测量牡蛎的高度，以确定增长，并在他们的肠道浮游植物进行了检查，显微镜下，并使用指示颜料和浮游植物的丰度和组成的水柱进行比较。增长是较高的第二年的研究时，流量较低，盐度较高。食物选择性计算使用修改的选择性指数（Ei），这涉及浮游植物组成的肠道中的水。牡蛎似乎优先放牧或至少优先保留在肠道各种（身份不明）鞭毛虫，Ochrophyta（硅藻）和Myzozoa（甲藻），并出现一般拒绝蓝藻，特别是picocyanobacteria，从他们的饮食。其中包括几种常见的有害藻华类群，包括Prorocentum minimum（=P. cordatum）和Heterocapsa rotundatum，这可能会对牡蛎的生长产生不利影响。减少富营养化可能是有益的牡蛎饮食，如果这种减少导致更少的甲藻水华和picocyanobacteria丰度在关键的喂养夏季。
A 2-year study was undertaken to understand feeding preferences of the eastern oyster Crassostrea virginica in the eutrophic Rhode River, a tributary of Chesapeake Bay, Maryland, USA. A subset of experimentally suspended oysters was collected monthly and environmental parameters were simultaneously measured. Oysters were measured in height to determine growth, and the phytoplankton in their gut were examined both microscopically and using indicator pigments and compared with phytoplankton abundance and composition in the water column. Growth was higher in the second year of the study when flow was lower and salinity higher. Food selectivity was calculated using a modified electivity index (Ei), which relates phytoplankton composition in the gut to that in the water. Oysters appeared to preferentially graze-or at least preferentially retain in the gut-various (unidentified) flagellates, Ochrophyta (diatoms) and Myzozoa (dinoflagellates), and appeared to generally reject cyanobacteria, especially picocyanobacteria, from their diet. The Myzozoa included several common harmful algal bloom taxa, including Prorocentum minimum (=P. cordatum) and Heterocapsa rotundatum, that can detrimentally affect oyster growth. Reductions in eutrophication will likely be beneficial for oyster diets if such reductions result in fewer dinoflagellate blooms and in picocyanobacteria abundance during the critical feeding summer months.