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Sensitivity of aquatic insect eggs to elevated fine sediment and phosphate concentrations in rivers

水生昆虫卵对河流中细泥沙和磷酸盐浓度升高的敏感性

基本信息

批准号：
2273126
负责人：
金额：
--
依托单位：
University of Nottingham
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2019
资助国家：
英国
起止时间：
2019 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=studentship-2273126
关键词：
Sensitivity aquatic insect eggs elevated

项目摘要

Insect populations are declining at an alarming rate, globally. Aquatic insects live as larvae in rivers before hatching as terrestrial flies, reproducing and laying eggs onto the water surface or marginal areas. Aquatic insects have a crucial functional role in the environment and are used to monitor stream impairment.Despite the significance of aquatic insects, the majority of research is focused on the larval stage of these animals, with very little consideration of eggs. This is despite pollutants having potentially greater effects on early life stages that are typically the least mobile and most vulnerable to stressors. An exception is the work of Everall et al. (2018) who found eggs of the mayfly Serratella ignita were significantly impacted by chronic low dosages of fine sediment (FS) and orthophosphate (OP), well below legal thresholds in the UK and internationally. It is, therefore, essential that greater focus is given to the impacts of pollutants on insect eggs, rather than solely focusing on larvae. OP and FS are the leading cause of degradation to freshwater systems internationally. Legal thresholds of pollutants in rivers are largely based on larval tolerances and on annual average concentrations calculated from monthly measurements, not accounting for shortterm peaks in pollutant concentrations that could be highly significant.

全球范围内，昆虫数量正在以惊人的速度下降。水生昆虫的幼虫生活在河流中，然后孵化为陆生苍蝇，繁殖并在水面或边缘地区产卵。水生昆虫在环境中起着至关重要的作用，并被用于监测河流受损情况。尽管水生昆虫具有重要意义，但大多数研究都集中在这些动物的幼虫阶段，很少考虑卵。尽管污染物对生命早期阶段有潜在的更大影响，但这些阶段通常是移动的最少，最容易受到压力的影响。一个例外是Everall等人（2018）的工作，他们发现蜉蝣Serratella ignita的卵受到长期低剂量细沉积物（FS）和正磷酸盐（OP）的显著影响，远低于英国和国际上的法律的阈值。因此，必须更加关注污染物对昆虫卵的影响，而不仅仅是关注幼虫。OP和FS是国际淡水系统退化的主要原因。河流中污染物的法律的阈值主要基于幼虫的耐受性和根据每月测量值计算的年平均浓度，而不考虑可能非常重要的污染物浓度的短期峰值。