Differences in the damage caused by hypoxia to the macrobenthic communities in source regions of hypoxic water and in regions with advected hypoxic water
Differences in the damage caused by hypoxia to the macrobenthic communities in source regions of hypoxic water and in regions with advected hypoxic water
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低氧水源区与平流低氧水区缺氧对大型底栖动物群落损害的差异
DOI：
10.1007/s10872-018-0485-x
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发表时间：
2018
影响因子：
2.3
通讯作者：
H Tsutsumi
中科院分区：
文献类型：
--
作者：
S Ishimatsu;T Komorita;R Orita;H Tsutsumi
本研究的目的是确定输送低氧水对日本九州伊萨谷湾大型底栖动物物种组成的影响。为此，我们对水质、沉积物质量和大型底栖动物群落进行了跨季节的实地调查。根据海湾六个监测塔的连续监测数据，计算了2014年7月1日至9月30日夏季期间的低氧强度，定义为一个地区出现低氧状态的时间百分比[DO<； 3.0 mg−1]。在这里，我们讨论了低氧引起的损害，即海湾大型底栖动物群落物种组成因低氧而发生的变化，在海湾内部和中部区域(泥质沉积物)和海湾外部区域(沙质沉积物)之间有何不同。湾内大型底栖动物种群密度的下降与DO浓度最低的时期(<； 1.0 mg和L−1)有关。在DO浓度降至最低水平后，尽管该区域的缺氧强度最低(6.6%)，但大量物种从该区域的大型底栖动物群落中消失。消失的物种，包括甲壳类和一些多毛类，被推定对缺氧敏感，并逃脱了缺氧。湾内和湾中的物种消失较少，缺氧强度较高，分别为14.0%和26.7%。原因似乎是耐低氧物种在内部和中间区域占优势，而在外部区域并不占优势。我们的研究表明，在空间不同的环境中估计低氧的影响必须谨慎。
The objective of this study was to determine the effects of transported hypoxic water on macrobenthic species composition in Isahaya Bay, Kyushu, Japan. To this end, we conducted a field survey of water quality, sediment quality, and the macrobenthic community across seasons. Hypoxic intensity, defined as the percentage of the time that a region exhibits hypoxic conditions [dissolved oxygen (DO) < 3.0 mg L−1], was calculated for the summer period from July 1 to September 30, 2014 based on continuous monitoring data derived from six monitoring towers in the bay. Here, we discuss how the hypoxia-induced damage, defined as the change in the species compositions of the macrobenthic communities in the bay due to hypoxia, differs between the inner and middle regions of the bay (with muddy sediment) and the outer regions of the bay (with sandy sediment). A decrease in the density of macrobenthic species that was correlated to the period of lowest DO concentration (< 1.0 mg L−1) was observed in the inner region of the bay. A large number of species disappeared from the macrobenthic community in the outer region after the DO concentration had dropped to its lowest level, even though this region presented the lowest hypoxic intensity (6.6%). The species that disappeared, including crustaceans and some polychaetes, were presumed to be sensitive to, and to have escaped from, hypoxia. Fewer species disappeared from the inner and intermediate regions of the bay, which had high hypoxic intensities of 14.0 and 26.7%, respectively, than from the outer region. The reason for this appeared to be a predominance of hypoxia-tolerant species in the inner and intermediate regions but not in the outer region. Our study suggests that estimating the effect of hypoxia in a spatially heterogeneous environment must be done with caution.
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