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Philippines Clams In (ruditapes Philippinarum), Bioturbation Experimental Research

Posted on:2006-03-12Degree:MasterType:Thesis
Country:ChinaCandidate:Y F DuFull Text:PDF
GTID:2190360152966693Subject:Marine Ecology
Abstract/Summary:PDF Full Text Request
The effect of bioturbation of Manila Clam Ruditapes philippinarum on the sedimentary particle's flux, which was suspended into water and transferred downwards, was conducted with tracer beads by quantitative study. Sediments were sampled currently with minimal disturbance using PVC corer at station selected in the intertide of Huiquan Bay Qingdao, in July, October and December of 2003. To discuss the relationship between the bioturbation and its weight, food and temperature , the Manila clam was selected by two size groups under two feeding condition in the three periods of time. The competition experiment was carried out using Chlamys farreri suspended in the water by cage and Ruditapes Philippinarum inhabited in the sediment at the same container. Present study aims at offering the basic parameters for crucial ecological course on farming fields and benthic-pelagic coupling.The result showed that the bioturbation of the Manila clam was evidenced. The tracer bead on the surface of the sediment was suspended into overlying water with the mean value of 21.6%, and the vertical transportation into sediment was 27.7%. At a depth of 8 cm 16.4% of the tracer bead was transferred upwards and 8.1% downwards respectively .The bioturbation led the sediment particles to mix under its active range and prompted particulate matter into overlying water. The experimental data proved that the Manila calm not only occupied an important position in the biogeochemical cycle interface of sediment/waters, but also performed a crucial role in the benthic-pelagic coupling.Weight, Feeding condition, temperature and their interaction all had effects on the bioturbation, but the extent of effect was different under different condition .The general trend was that effect of bioturbation increased with the increase of individual weight and water temperature, while decreased with unit weight increase, and the group with food was higher than the group without. In the condition of the experiment Manila Calm's the activities in competition were enhanced compared with the dependence group; The parameters of bioturbation decreased with the food's decrease with no obvious difference, which was possibly related to the lower temperature...
Keywords/Search Tags:Ruditapes philippinarum, Bioturbation, Competition, Tracer beads
PDF Full Text Request
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