Effect of acute acidic stress on survival and metabolic activity of zooplankton from Lake Biwa, Japan

Effect of acute acidic stress on survival and metabolic activity of zooplankton from Lake Biwa, Japan
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急性酸性胁迫对日本琵琶湖浮游动物生存和代谢活性的影响

DOI:
10.1080/20442041.2022.2058861
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发表时间:
2022
期刊:
影响因子:
3.1
通讯作者:
Syuhei Ban
Syuhei Ban
中科院分区:
环境科学与生态学3区
文献类型:
--
作者:
Huanan Gao;Xin Liu;Syuhei Ban

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酸雨等来源的急性酸胁迫可能会对湖泊生态系统产生多方面的影响。由于浮游动物对环境变化很敏感,它们可能是酸化效应的良好生物指示器。本文调查了琵琶湖3种优势浮游动物的存活率和代谢率,即枝角类蚤状水蚤和桡足类日本始针水蚤和剑水蚤,当在低温(10 °C)和高温(20 °C)下经受不同pH值(pH 4.0-8.0)时。由于D. Pulicaria和Cyclopoida spp.在pH < 4.6条件下培养24 h,其降解率超过50%,而E.在pH <5.6时,E. japonicus可能比其他2个分类群更容易受到酸性胁迫。在较宽的pH范围内(4.6-8.0),蚤状蚤的代谢速率相对稳定,但在酸性条件下(pH4.6 -7.0),两种桡足类的代谢速率均下降。这种代谢率的降低可能与它们在酸性条件下游泳活动减少有关。
Acute acidic stress from sources such as acid rain might impact lake ecosystems in many aspects. Because zooplankton are sensitive to environmental change, they could be a good biotic indicator of acidification effects. We investigated survival and metabolic rates of 3 dominant zooplankton taxa in Lake Biwa, the cladoceranDaphnia pulicariaand the copepodsEodiaptomus japonicusand Cyclopoida spp., when subjected to different pH values (pH 4.0–8.0) at low (10 °C) and high (20 °C) temperatures. Because mortality ofD. pulicariaand Cyclopoida spp. exceeded 50% over 24 h of incubation at pH < 4.6, but forE. japonicusat pH < 5.6,E. japonicusmay be more vulnerable to acidic stress than the other 2 taxa. This vulnerability to acidification slightly increased at 10 °C for each taxon. Metabolic rates inD. pulicariaremained relatively constant over a wide pH range (4.6–8.0), but those of both copepods decreased at acidic conditions (pH 4.6–7.0). This decrease of metabolic rate might be related to their swimming activity, which decreased in acidic conditions.
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