The systematic and ecological contribution of the benthic fauna in the Drino River

Abstract

Identification and evaluation of natural and biological resources of the rivers, it's very important and necessary for the protection, usefulness, and refinement of their condition. The usage of benthic macroinvertebrates in the monitoring of water quality of rivers is considered an efficient method according to the Water Framework Directive (WFD, 2000). This research is conducted in the course of the year 2019 in the Drino River where its purpose was to assess its biological diversity regarding to index - Simpson and also to estimate the river's water quality using Family Biotic Index - FBI. The method used for sampling was based in technique Kick net with mesh size 500 micron. From the sampling taken in three stations, 1084 individuals were collected that belong to 25 families. The values of the FBI for the station I (FBI = 4.69) belong to the third class of the quality "Good," meanwhile station II (FBI = 2.95) and station III (FBI = 3.38) belong to the first class of quality "Excellent". Simpson Diversity Index where represents with value D = 0.84 showing a high level of diversity. The evaluation of the water quality according to the FBI as "Excellent" quality at two stations and "Very good" at one station was associated with the highest biological diversity according to "Simpson Index". We detect also correlation between the two ecological parameters taken under consideration. In the first station was observed a lower good water quality and a lower number of sampled individuals compared to the other two stations. This situation indicates possible organic pollution.