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CCA shows the effects of environmental parameters on the occurrence of dragonfly larvae before the dredging. Abbreviations: Cal spl − Calopteryx splendens, Cal vir − Calopteryx virgo, Ery naj − Erythromma najas, Gom vul − Gomphus vulgatissimus, Pla pen − Platycnemis pennipes, Sym vul − Sympetrum vulgatum.
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