The responses of morphological variation of Keratella cochlearis to environmental changes

LIU Lu; LIANG Di-wen; YANG Yu-feng; JIN Ding; YE Xiao-tong; WANG Qing

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China Environmental Science ›› 2021, Vol. 41 ›› Issue (11) : 5326-5333.

Environmental Ecology

The responses of morphological variation of Keratella cochlearis to environmental changes

LIU Lu^1,2, LIANG Di-wen¹, YANG Yu-feng^1,2, JIN Ding¹, YE Xiao-tong¹, WANG Qing^1,2

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Abstract

In this study, to measure and analyze the morphometric parameters of K.cochlearis, 14sites were selected in Nan'ao Island, Guangdong Province and Changde city, Hunan Province with different water trophic statuses from mesotrophic to moderate-eutrophic. Samples were collected quarterly from July 2015 to December 2018. The results showed that the water temperature was the most important factor affecting the morphological changes of K.cochlearis and had a significant negative correlation with lorica length, lorica width and spine length (P<0.01). There were significant differences in morphometric parameters of K.cochlearis in different latitudes, with individuals from Changde area being significantly larger than those in Nan'ao (P<0.05). There were also significant seasonal changes in the morphology of K.cochlearis, and the morphological parameters of this species showed different pattern between summer-autumn and winter-spring. The length of the posterior spines of K.cochlearis decreased with the increased of nutrient loading (F=159.4, P<0.01), and the ratio of the length of the posterior spines to the total length of rotifer decreased under eutrophic condition (F=167.5, P<0.01). The results showed that the spine length of K.cochlearis can be used as a biological monitoring index of water quality, and provided an important reference for the study of global warming.

Key words

cyclomorphosis / ecological indicator / environmental response / phenotypic plasticity / rotifer

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LIU Lu, LIANG Di-wen, YANG Yu-feng, JIN Ding, YE Xiao-tong, WANG Qing. The responses of morphological variation of Keratella cochlearis to environmental changes[J]. China Environmental Science. 2021, 41(11): 5326-5333

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