Role of filter-feeding mollusk in ecosystem of composite cultivation of Penaeus
- 生命科学－已发表论文 
就混养虾池中滤食性贝类如何影响虾池整个生态系统这个问题 ,综合了国内外这方面的文献 ,从滤食性贝类对混养虾池的水质、底质和其中的浮游植物、浮游动物的影响 ,以及混养对养殖效益的影响这几个方面作了探讨How does the filter feeding mollusk influence the ecosystem of polybasic composite cultivation? This paper deals with the studies on this question in recent years and concludes the following:(1) The filter feeding mollusk survive on the phytoplankton, other microorganisms and some crumb of organism. They feed so much everyday that there has an enormous feeding pressure on the ecosystem which leads to the descent of phytoplankton's biomass;(2)The cultivation excrement and the excrement discharged by the mollusk result in biodeposition ,which enhance the activity of the microbe in the substratum and make an non oxygen or oxy sparse surrounding .At the same time ,the activity of biodeposition accelerate the release of inorganic salts.So biodeposition has a great effect on the structure and function of the ecosystem and is able to change the population composition of the benthos ;(3)The increase of the inorganic salts fertilizes the water in ponds, which will be good for the microphytoplankton to grow and reproduce because of its adaption and will inhibit the growth of miniphytoplankton and some pelagic protozoa for their maladjustment. Some bigger zooplankton and Copepoda are less accessible;(4) the model of polybasic composite cultivation which makes the living space of the zoo isolated relatively and makes the niche combine with each other has greater efficiency than other models do if managed well.