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Abstract

This paper examines the impact of disturbance factors -flooding and desiccation -on the distribution of water mites in the riparian springs situated in the valley of a small lowland river, the Krąpiel. The landscape factors and physicochemical parameters of the water were analysed in order to gain an understanding of the pattern of water mite assemblages in the riparian springs. Three limnological types of springs were examined (helocrenes, limnocrenes and rheocrenes) along the whole course of the river and a total of 35 water mite species were found. Our study shows that flooding influences spring assemblages, causing a decrease in crenobiontic water mites in flooded springs. The impact of intermittency resulted in a high percentage of species typical of temporary water bodies.Surprisingly, the study revealed the positive impact of the anthropogenic transformation of the river valley: preventing the riparian springs from flooding enhances the diversity of crenobiontic species in non-flooded springs. In the conclusion our study revealed that further conservation strategies for the protection of the riparian springs along large rivers would take into account ongoing climatic changes and the positive impact of the anthropogenic transformation of river valleys.PeerJ Preprints | https://doi.org/10.7287/peerj.preprints.26895v1 | CC BY 4.0 Open Access | recABSTRACT 24 This paper examines the impact of disturbance factors -flooding and desiccation -on the 25 distribution of water mites in the riparian springs situated in the valley of a small lowland river, 26 the Krąpiel. The landscape factors and physicochemical parameters of the water were analysed in 27 order to gain an understanding of the pattern of water mite assemblages in the riparian springs.28 Three limnological types of springs were examined (helocrenes, limnocrenes and rheocrenes) 29 along the whole course of the river and a total of 35 water mite species were found. Our study 30 shows that flooding influences spring assemblages, causing a decrease in crenobiontic water 31 mites in flooded springs. The impact of intermittency resulted in a high percentage of species 32 typical of temporary water bodies. Surprisingly, the study revealed the positive impact of the 33 anthropogenic transformation of the river valley: preventing the riparian springs from flooding 34 enhances the diversity of crenobiontic species in non-flooded springs. In the conclusion our 35 study revealed that further conservation strategies for the protection of the riparian springs along 36 large rivers would take into account ongoing climatic changes and the positive impact of the 37 anthropogenic transformation of river valleys.