DBPapers
DOI: 10.5593/SGEM2014/B31/S12.013

ASSESSMENT OF THE QUALITY OF AN AQUATIC HABITAT FOR SCHNEIDER IN NITRICA RIVER

P. Ivan, V. Macura
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-13-1 / ISSN 1314-2704, June 19-25, 2014, Book 3, Vol. 1, 97-104 pp

ABSTRACT
The article is focused on the process of evaluation of the quality of aquatic habitats. The habitat quality is characterized by bioindication, which is represented by ichtyofauna in habitat suitability curves. During the periods of minimum flows the ichtyofauna prefers covers with deeper habitats. This has been showed by the correlation of suitability curve characteristics for water depth. The curves are based on the frequency sorting of the fish in microhabitat, which were determined on the basis of the ichtyological survey. Accuracy assessment of the suitability curves is one of the most important steps in the IFIM methodology. Evaluation and generalization of the suitability curves for Schneider (Alburnoides bipunctatus) was done in Nitrica river. Evaluation of the suitability curves was verified on the eastern Slovakia rivers Bebrava, Chotina and Nitrica. The suitability curves were processed for two abiotic parameters - depth and velocity. Hydraulic and ichthyologic measurements were performed in summer 2013. The morphology of the Nitrica River was measured for needs of 2D hydraulic modeling, which was performed by 2D model DHI MIKE 21FM. The model was set up for 280 mday discharge of the Nitrica River. Results from the hydraulic model were used for final analysis. The final analysis was provided in GIS environment by ArcGis 10.1. The results of weighted usable area show that the Schneider prefers minimum range of flows.

Keywords: IFIM, 2D hydraulic model, Weighted Usable Area (WUA), suitability curve, Schneider