Seikai National Fisheries Research Institute, Japan Fisheries Research and Education Agency, 1551-8 Taira-machi, Nagasaki 851-2213, Japan.
Seikai National Fisheries Research Institute, Japan Fisheries Research and Education Agency, 1551-8 Taira-machi, Nagasaki 851-2213, Japan.
Mar Pollut Bull. 2017 Dec 15;125(1-2):86-91. doi: 10.1016/j.marpolbul.2017.07.073. Epub 2017 Aug 7.
Hypoxia is associated with mass mortality in estuaries, but a direct causal relationship has not been proven to date. This study aimed to demonstrate this relationship and to evaluate how the duration of hypoxia affects the survival of ark shells (Anadara kagoshimensis) using mathematical modeling. The dissolved oxygen concentration was monitored at two stations in the innermost area of Ariake Bay, Japan, to calculate the duration of hypoxia. This was then included in a mathematical model to simulate the population density with sequential computation. The population density decreased with prolonged hypoxia, reaching a value close to the observed population density, indicating that hypoxia is the main cause of mass mortality in ark shells. Furthermore, the ark shell population disappeared in 8days with constant hypoxia but persisted when hypoxia was alternated with normoxia every 6 h. Therefore, mass mortality is caused by the duration rather than the frequency of hypoxia.
缺氧与河口大规模死亡事件有关，但迄今为止尚未证明存在直接的因果关系。本研究旨在通过数学建模来证明这种关系，并评估缺氧持续时间如何影响贻贝（Anadara kagoshimensis）的存活。本研究在日本有明海最内部的两个站位监测溶解氧浓度，以计算缺氧持续时间。然后将其纳入数学模型中，通过连续计算来模拟种群密度。随着缺氧时间的延长，种群密度下降，接近观察到的种群密度，这表明缺氧是贻贝大规模死亡的主要原因。此外，在持续缺氧的情况下，贻贝壳种群在 8 天内消失，但当缺氧每 6 小时与正常氧交替时，贻贝壳种群得以存活。因此，大规模死亡是由缺氧持续时间而不是缺氧频率引起的。
