Seasonal variation of tidal prism and energy in the Changjiang River estuary: a numerical study
Seasonal variation of tidal prism and energy in the Changjiang River estuary: a numerical study
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DOI：
10.1007/s00343-015-4302-8
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发表时间：
2015
影响因子：
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通讯作者：
Min Zhang;I. Townend;H. Cai;Yunxuan Zhou
中科院分区：
文献类型：
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作者：
Min Zhang;I. Townend;H. Cai;Yunxuan Zhou
本研究旨在评估引进文蛤对河口生态系统的潜在影响，以及与本地文蛤的生态位竞争。研究了M.采用沉积物捕集器和封闭式呼吸器，在野外季节性地测定紫茎泽兰。M.紫茎泽兰为0.06-0.37 g/ind. d，呼吸速率为0.31- 14.66mg/ind./ D.氨和磷排泄率分别为0.18-36.70和1.44-14.87 µg/ind./ D、分别。文蛤M.紫茎泽兰每年向养殖池塘排放干沉积物2.1× 105 t，贡献NH3 18.3t，P 9.0t，消耗O2 7.9× 103 t。这表明文蛤M.在池塘生态系统中，紫茎泽兰可能通过生物沉积和排泄在浮游-底栖耦合中发挥重要作用。对引进的文蛤M.文蛤（Meretrix meretrix）和文蛤（M.双台子河口的文蛤生态位相似，若能在一定程度上与文蛤竞争栖息地和食物，则可能与文蛤发生潜在的竞争。河口生态系统中有从养殖池中逃逸或人工释放的紫茎泽兰种。
This study aimed to evaluate the potential impacts of an introduced clam Mercenaria mercenaria on estuarine ecosystem, and implications for the niche competition with a native clam Meretrix meretrix. The biodeposition, respiration, and excretion rates of M. mercenaria were determined seasonally using a sediment trap and a closed respirator in field. The biodeposition rates of M. mercenaria were 0.06–0.37 g/ind./d, and the respiration rates were 0.31–14.66 mg/ind./d. The ammonia and phosphate excretion rates were 0.18–36.70 and 1.44–14.87 µg/ind./d, respectively. The hard clam M. mercenaria may discharge dry deposits up to 2.1× 105 t, contribute 18.3 t ammonia and 9.0 t phosphate to culture ponds, and consume 7.9× 103 t O2 from ponds annually. It suggested that the hard clam M. mercenaria might play an important role in pelagic-benthic coupling in pond ecosystem through biodeposition and excretion. A comparison of the key physiological parameters of the introduced clam M. mercenaria and the native clam Meretrix meretrix suggested that M. mercenaria had a niche similar to that of Meretrix meretrix in Shuangtaizi estuary and might have a potential competition with Meretrix meretrix for habitat and food if M. mercenaria species escaped from the culture pond or artificially released in estuarine ecosystem.