engleski

Community structure of aquatic insects in the karst river Jadro (Dinaric karst, Croatia)

This study focused on the aquatic insect community in longitudinal gradient and temporal scales of the river jadro. The river was sampled for ten years period (2000 – 2010), four times per year through seasons along the river course. Sampling stations were selected in upper, middle and downstream the river. A total of 21 852 specimens of aquatic insects belonging to 6 orders were obtained. The species determination confirms 27 different species. The data were analysed by the multivariate methodologies of Correspondence Analysis (CA) and Cluster Analysis (UPGMA) using the similarity index of Morosita for all ten years. The Canonical Correspondence Analysis (CCA) was applied to the data to check which of the mesured physicochemical variables significantly explained community variation. The most significant variables was water temperature for the upper stations and water temperature and dissolved oxygen for the lower stations.

insects; longitudinal gradient; karst river; multivariate analysis.

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