Feeding rate of the oyster Crassostrea gigas in a natural planktonic community of the Mediterranean Thau Lagoon
Feeding rate of the oyster Crassostrea gigas in a natural planktonic community of the Mediterranean Thau Lagoon
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DOI：
10.3354/meps205171
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发表时间：
2000-01-01
影响因子：
2.5
通讯作者：
Le Gall, S
中科院分区：
文献类型：
--
作者：
Dupuy, C;Vaquer, A;Le Gall, S
地中海托泻湖是欧洲重要的牡蛎养殖区。尽管叶绿素浓度较低，但牡蛎的生长率在法国名列前茅。先前的研究表明，微型浮游植物、纳米微型浮游植物、甲藻和金毛纤毛虫（如丁丁类）的数量非常丰富。然而，异养鞭毛虫和有毛纤毛虫尚未被研究。这项研究的目的是评估泻湖中微型浮游植物、原生生物和浮游动物的丰度，并调查微生物食物网的特殊结构，这可能解释这种矛盾的牡蛎生长。在 Thau 泻湖的贫营养水域中，超微核生物金牛骨球菌是主要的自养超微浮游生物，其丰度在夏季达到最大值。 1998 年 8 月 17 日，一场降雨事件之后，微微型和微型浮游植物的丰度没有预期的那么高，我们观察到大型硅藻的丰度很高。此时，可用的碳资源是由微型浮游植物产生的（84.5%），而微微浮游植物的碳仅占1.27%。异养细胞丰度较低，由5mm鞭毛虫、浮游微型植物、甲藻、纤毛虫和大型浮游动物组成，被牡蛎鳃保留。只有鞭毛虫
The Mediterranean Thau Lagoon is an important oyster farming area in Europe. Oyster growth rates are among the highest in France, although chlorophyll a concentration is low. Previous studies have demonstrated that picophytoplankton, nano-microphytoplankton, dinoflagellates and loricate ciliates such as tintinnids are abundant. However, heterotrophic flagellates and aloricate ciliates have not been investigated. The aim of this study was to assess picophytoplankton, protist and zooplankton abundances in the Lagoon and to investigate the particular structure of the microbial food web, which may explain such paradoxical oyster growth. In oligotrophic waters in the Thau Lagoon, the picoeukaryote Ostreococcus tauri is the dominant autotrophic picoplankter, with an abundance maximum in summer. On 17 August 1998, following a rainfall event, pico- and nanophytoplankton abundances were not as high as expected and we observed a high abundance of large diatoms. At this time, the available carbon resources were produced by microphytoplankton (84.5%), and picoplank-tonic cells represented only 1.27 % in terms of carbon. Heterotrophic cells were low in abundance and constituted 5 mum flagellates, microphytoplankton, dinoflagellates, ciliates and large zooplankton were retained by the oyster gills. Only flagellates