生境变化对溪流EPT水生昆虫的影响

Effects of Habitats Change on EPT Aquatic Insects in Streams

溪流是非常脆弱的生态系统,其容易遭受人类的干扰和破坏。帽儿山溪流流经黑龙江省帽儿山国家森林公园,由于人类活动的影响,一些河段的生境发生了改变,溪流生态系统面临着非常严重的压力。蜉蝣目(Ephemeroptera)、襀翅目(Plecoptera)和毛翅目(Trichoptera)幼虫是溪流生态系统中对水环境非常敏感的三类昆虫,简称EPT。2019年春,在帽儿山溪流上游划分了三个不同河段(干扰段、恢复段和自然段),并进行EPT水生昆虫的采集和水环境因子的检测和分析。对EPT水生昆虫的摄食功能群(Functional Feeding Groups: FFGs)进行了研究,利用冗余分析(RDA)探讨了FFGs与主要水体理化因子的关系。研究结果表明,溪流不同河段水环境理化因子中水温(WT)和电导率(Cond)具有显著性差异(p 2。RDA分析表明,SC与TP表现出一定的负相关性;PR与Cond表现出正相关关系。

Streams are very fragile ecosystems, and their habitats are easy to be destroyed by the human disturbance. Maoershan streams flow through Maoershan National Forest Park in Heilongjiang Province, Northeast China. The stream ecosystems are under quite serious pressure because of the human activities. And the larvae of Ephemeroptera, Plecoptera, and Trichoptera (EPT) are three types of insects that are very sensitive to habitats change in stream ecosystems. In the spring of 2019, the sampling sites were set up in the upper reaches of the streams of three different sections in the Maoershan streams to collect EPT aquatic insects and measure water environmental factors. The Functional Feeding Groups (FFGs) of EPT aquatic insects were studied, and the relationship between FFGs and the main physicochemical factors of the water body was performed using Re-dundancy Analysis (RDA). The results showed that in the different stream sections, the water temperature (WT) and conductivity (Cond) had significant differences (p 2. The RDA analysis showed that SC was negatively correlated with TP while PR was positively correlated with Cond.