Exploration of the utility of fluctuating asymmetry as an indicator of river condition using larvae of the caddisfly Hydropsyche morosa (Trichoptera: Hydropsychidae)
Exploration of the utility of fluctuating asymmetry as an indicator of river condition using larvae of the caddisfly Hydropsyche morosa (Trichoptera: Hydropsychidae)
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利用石蛾 Hydropsyche morosa（毛翅目：Hydropsychidae）的幼虫探索波动不对称作为河流状况指标的实用性
DOI：
10.1023/a:1021297503935
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发表时间：
2002
期刊：
影响因子：
2.6
通讯作者：
D. Williams
中科院分区：
文献类型：
--
作者：
N. Bonada;D. Williams
生物体有三种形态不对称：定向不对称、反不对称和波动不对称，但只有波动不对称与个体发育过程中的环境压力有关。在加拿大安大略的五条河流中，每一条河流都表现出不同程度的人类影响，对水鳖进行了FA检查。标本来自皇家安大略博物馆1951年的藏品，以及1999年的新藏品。对297头幼虫的左右两侧进行了12个形态学特征的评估，其中8头表现出FA。有一种趋势，随着时间的推移增加FA的水平。河水中的氮，电导率和氯化物的水平，作为一个指标的污染，显着和正相关的FA的发病率增加的四个字符，其余的是独立的污染。
Organisms are subject to three types of morphological asymmetry: Directional Asymmetry, Antiasymmetry and Fluctuating Asymmetry, but only the latter (FA) is related to the environmental stress acting upon individuals during their development. Larvae of Hydropsyche morosa from five rivers in Ontario, Canada, each exhibiting different degrees of human impact, were examined for FA. Specimens were obtained from collections in the Royal Ontario Museum dating back to 1951, and from fresh collections to 1999. Twelve morphological characters were assessed on both the left and right sides of 297 larvae, and eight of them demonstrated FA. There was a tendency to increase the levels of FA over time. Levels of nitrogen, conductivity and chloride in the river water, used as an index of pollution, were significantly and positively correlated with increasing incidence of FA in four of the characters, the remainder were independent of pollution.