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首页> 外文期刊>Mycologia >Aquatic hyphomycete strains from metal-contaminated and reference streams might respond differently to future increase in temperature
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Aquatic hyphomycete strains from metal-contaminated and reference streams might respond differently to future increase in temperature

机译：来自金属污染和参考水流的水生疏水菌菌株对未来温度升高的反应可能不同

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摘要

Aquatic hyphomycetes, a group of polyphyletic fungi, have been reported in streams contaminated with metals. This tolerance to metal contamination however can result in limited performance and limited ability to cope with additional environmental change. The predicted increase in water temperature, as a consequence of global warming, will have an additional effect on many streams. The sensitivity to temperature of strains of three aquatic hyphomycete species isolated from a metal-contaminated stream and an uncontaminated stream was assessed by determining their radial growth and activity (conidial production, oxygen consumption, mycelial biomass accumulation, fine particulate organic matter [FPOM] production, and microbial induced leaf mass loss) at 13 C (present water temperature in autumn) and at 18 C (predicted water temperature under global warming). Growth and reproductive activity generally were depressed for the strains isolated from the metal-contaminated stream when compared with those isolated from the unpolluted stream. These differences however were not translated into differences in FPOM production and leaf-litter mass loss, indicating that the strains isolated from the contaminated stream can decompose leaf litter similar to those of the reference stream. The 5 C increase in temperature stimulated fungal activity and litter decomposition, irrespective of species and strain. This might have strong effect on aquatic food-web and ecosystem functioning under global warming because increases in litter decomposition might lead to food shortage for higher trophic levels. The sensitivity to temperature depended on the response variable, species and strain. FPOM production was the variable most sensitive to temperature across strains and species and that for which temperature sensitivities differed most between strains. Fungal tolerance to metal contamination affects the extent to which its functions are stimulated by an increase in temperature, constituting an additional cost of metal tolerance.
机译：据报道，在金属污染的溪流中，水生真菌是一种多菌种真菌。但是，这种对金属污染的耐受性可能会导致性能下降和应对其他环境变化的能力下降。由于全球变暖，预计的水温升高将对许多溪流产生附加影响。从金属污染流和未污染流中分离出的三种水生浮游菌种对菌株的温度敏感性通过确定其径向生长和活性（分生孢子产生，耗氧量，菌丝生物量积累，细颗粒有机物[FPOM]产生）来评估，以及微生物引起的叶片质量损失）在13 C（秋天的当前水温）和18 C（在全球变暖下的预测水温）下。与从无污染流中分离出的菌株相比，从金属污染流中分离出的菌株通常会抑制其生长和繁殖活性。但是，这些差异并没有转化为FPOM产量和叶片凋落物质量损失的差异，表明从受污染流中分离出的菌株可以分解叶片凋落物，类似于参考流。温度升高5 C会刺激真菌活性和凋落物分解，而与物种和品系无关。这可能会对全球变暖下的水生食物网和生态系统功能产生重大影响，因为凋落物分解的增加可能导致营养水平较高的食物短缺。对温度的敏感性取决于响应变量，种类和应变。 FPOM生产是跨菌株和物种对温度最敏感的变量，而菌株之间的温度敏感性差异最大。真菌对金属污染的耐受性影响了温度升高刺激其功能的程度，从而增加了金属耐受性的成本。

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