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Temperature-induced variability in metabolic activity of ecologically important estuarine macrobenthos

机译：温度引起的重要生态河口底栖动物代谢活动的变异性

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摘要

Temperature is one of the more important factors affecting metabolism and fitness of aquatic ectothermic animals. The present study aimed, therefore, at quantifying and comparing the oxygen consumption rates of several subtropical macrobenthos organisms living in two South African estuarine systems. Oxygen fluxes were measured in the laboratory at an individual level for temperatures ranging between 16 and 30 degrees C. The metabolic response differed significantly among taxa, developmental stage, and microhabitat, with higher activation energy for the animals from the permanently open estuary compared to the one from the temporarily open/closed system. The invasive snails showed an exceptional higher metabolic performance at higher temperatures compared to the other organisms collected within the temporarily open/closed system. The results suggest that estuaries experiencing prolonged closure with stable environmental conditions and lower biodiversity host the least performing native species. Setting this pattern in a future global change scenario, this study highlights that longer closures of the estuarine mouth caused by changing rainfall regimes and increased freshwater abstractions from catchments are likely to create the ideal conditions for the proliferation of more adaptable invasive species in temporally open/closed subtropical estuaries.
机译：温度是影响水生吸热动物代谢和适应性的重要因素之一。因此，本研究旨在量化和比较生活在两个南非河口系统中的几种亚热带大型底栖生物的耗氧率。在实验室中针对温度在16至30摄氏度之间的个体水平测量了氧气通量。在分类单元，发育阶段和微生境之间，代谢反应存在显着差异，与永久开放河口相比，动物的活化能更高。一个来自临时打开/关闭的系统。与在临时打开/关闭的系统中收集的其他生物相比，侵入性蜗牛在较高的温度下表现出异常高的代谢性能。结果表明，河口经历长期封闭，稳定的环境条件和较低的生物多样性，是表现最差的本地物种。在未来的全球变化情景中设定这种模式，这项研究强调指出，由于降雨制度的变化和流域淡水抽取量的增加而导致河口口更长的闭合时间，很可能为暂时开放/封闭的亚热带河口。

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  • 来源
    《Marine biology》 |2018年第1期|23.1-23.13|共13页
  • 作者

    Tagliarolo M.; Porri F.; Scharler U. M.;

  • 作者单位

    Univ KwaZulu Natal, Sch Life Sci, Durban, South Africa;

    South African Inst Aquat Biodivers, Private Bag 1015, ZA-6140 Grahamstown, South Africa;

    Univ KwaZulu Natal, Sch Life Sci, Durban, South Africa;

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