Temperature-dependent adverse effects of drifting macroalgae on the survival of Manila clams in a eutrophic coastal lagoon
Temperature-dependent adverse effects of drifting macroalgae on the survival of Manila clams in a eutrophic coastal lagoon
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DOI：
10.3800/pbr.12.238
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发表时间：
2017-11
影响因子：
0.6
通讯作者：
Y. Miyamoto;Katsumasa Yamada;K. Hatakeyama;M. Hamaguchi
中科院分区：
文献类型：
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作者：
Y. Miyamoto;Katsumasa Yamada;K. Hatakeyama;M. Hamaguchi
大型漂流藻类的增殖和随之而来的底栖动物物种的贫化已成为世界范围内的一个重大问题。我们研究了日本西部中海泻湖中大型藻类对马尼拉蛤存活的影响的温度依赖性。我们进行了（i）每半月一次的实地调查，以阐明大型藻丰度和蛤密度的季节变化，以及（ii）在两种温度设置（平均水温：19°C和29°C）下进行为期7天的大型藻类封闭和排除实验，以测试温度引起的藻类对底水氧化还原条件和蛤存活的影响差异。夏季（7 月至 9 月）期间，蛤的密度下降，此时观察到大型漂流藻类的覆盖度和厚度增加。相反，从秋季到春季，随着大型藻类丰度的减少，蛤的密度增加。此外，还原条件（Eh29°C）表明，漂浮的大型藻类在夏季温度下引起缺氧，从而导致蛤死亡。当平均水温为 29°C 时，为期 7 天的藻类封闭实验减少了底层水条件。此外，在 29°C 的温度下，蛤在藻类围场中的存活率下降，而在 19°C 时没有检测到这种变化。这些结果表明，漂流大型藻类对地球化学环境和蛤存活的影响取决于温度；因此，全球变暖可能会增加大型藻类引起的缺氧的可能性，并对海洋生物产生相关的不利后果。
The proliferation of drifting macroalgae and the accompanying occurrence of the impoverishment of zoobenthic species has become a major problem worldwide. We examined the temperature dependency of the effects of macroalgae on the survival of Manila clams in Nakaumi Lagoon in western Japan. We conducted (i) semi-monthly field surveys to clarify seasonal changes in macroalgal abundance and clam density and (ii) 7-day macroalgal enclosing and excluding experiments in two temperature settings (mean water temperatures: 19 and 29°C) to test temperature-induced differences in algal effects on bottom-water redox conditions and clam survival. Clam density decreased during summer (July–September), when increased coverage and thickness of drifting macroalgae was observed. In contrast, clam density increased from autumn to spring as macroalgal abundance decreased. Further, reducing conditions (Eh29°C), suggesting that drifting macroalgae induced hypoxia under summer temperatures and consequently led to clam mortality. The 7-day algal enclosure experiment resulted in reducing bottom water conditions when mean water temperature was 29°C. Further, clam survival decreased in the algal enclosure at 29°C, whereas no such changes were detected at 19°C. These results indicate that the effects of drifting macroalgae on the geochemical environment and clam survival are temperature dependent; therefore, global warming may enhance the likelihood of macroalgae-induced hypoxia with its associated adverse consequences in marine life.