For example, sea stars prey on a variety of bivalve mollusks and prevent these bivalves from monopolizing habitats on the sea floor.

例如，海星捕食各种双壳类软体动物，防止这些双壳类动物独占海底的栖息地。

Among 52 species of mollusca identified, 45 were gastropods, 7 were bivalves.

调查期间采到的软体动物已鉴定52种，其中腹足类45种，双壳类7种。

However, it does not include trade of bivalves, fish health and quarantine issues.

不过，协定没有涉及到双壳贝类、水产品卫生和检疫问题。

When they attach to clams, as shown above, they prevent these bivalves from opening.

当它们附在蛤蜊上时，象上面插图显示的那样，它们会妨碍这些双壳类生物打开。

The tasty bivalves are known for removing excess phytoplankton from water and sequestering nutrients in their shells and flesh.

这些美味的双壳贝类生物以清除水中过量的浮游植物闻名于世，它们把营养变成肉和贝壳。

Speciation and content of arsenic in four Marine bivalves of Zhejiang province coast districts. The collection of four bivalves was done.

本实验主要围绕两个方面进行1浙江沿海地区四种海洋贝类中砷的形态和含量分析四种贝类样品采集。

It is highlighted that besides passive transport, dissolved metal transport into bivalves was involved in active transport coupled with ATP.

强调了贝类对溶解态重金属的转运除了被动转运之外，还涉及到需要AT P供能的主动转运过程。

Now we have recovered invertebrate fossils, such as bivalves, conchostracans, gastropods and ostracodes, in the dinosaurian egg-bearing strata.

本次研究在西峡盆地含恐龙蛋地层中首次发现了无脊椎动物化石，如双壳类、叶肢介、腹足类和介形类。

Although some studies were conducted to research in the accumulation and depuration of DA in bivalves, little is known of the metabolism mechanism of DA in fish.

尽管一些研究已对DA在双壳类动物中的积累和净化有一定的研究，但是关于DA在鱼类中的代谢机制研究得很少。

The changes of environmental factors and physiological processes of organism play an important role in controlling the bioavailability of metal to Marine bivalves.

环境因素和机体生理过程的改变在支配重金属的生物有效性方面起了重要作用。

The allopatric coral fossils are collected in the olistostromes of the Upper Triassic Zhuwo Formation in Mandi, Zamtang, and two biozones of Triassic bivalves are established.

首次于壤塘县曼迪乡上三叠统侏倭组的滑塌堆积层中，采获异地埋葬珊瑚群化石，建立三叠纪双壳类两个生物带；

The reproductive cycle of marine bivalves is closely related to cycles of nutrient storage and use and to environmental factors such as water temperature and food availability.

海洋贝类的繁殖周期与营养物质储存、利用和环境因子（如海水温度、食物可得性、盐度等）密切相关。

Out front, families are ankle-deep in bivalves, shovelling them into soybean sacks and stacking these in piles. The haul, says a woman with a grin, is on its way to the tables of Beijing.

在屋前，家庭成员们正在没膝的牡蛎堆里把牡蛎装到袋子里并堆放好，一位妇女笑着说，这些袋子里的东西要送到北京的餐桌上。

The fossils show that the bottom of the food chain was dominated by species typical of later Triassic Marine faunas - such as crustaceans, fishes and bivalves - and different from preceding ones.

这些化石揭示了生物链的底层被三叠纪后期海洋生物群典型物种所掌控，这不同于之前的世纪里的动物。