Water quality assessment of streams Bistrec and Boščak (Međimurje) using benthic macroinvertebrates

Cilj ovog diplomskog rada je procjena kakvoće voda potoka Bistrec i Bošćak na temelju makrozoobentosa. Istraživanje je provedeno od travnja do rujna 2010.godine na četiri postaje: Bistrec I, Bistrec II, Bošćak I i Bošćak II. Zabilježeni su predstavnici ukupno 17 skupina beskralješnjaka, a na svim postajama dominantna je skupina Amphipoda. Kakvoća vode određena je pomoću proširenog biotičkog indeksa i indeksa saprobnosti. Prema proširenom biotičkom indeksu kakvoća vode oba potoka pripada II vrsti, osim u kolovozu kada je III vrste. Indeks saprobnosti potoka Bistrec pokazuje II vrstu, dok na potoku Bošćak varira između II i III vrste. Uz analizu makrozoobentosa mjereni su i neki fizikalno kemijski parametri.The objective of this graduation thesis was water quality assessment of streams Bistrec and Bošćak based on the analysis of macrozoobenthos. The research was carried out from April until September of 2010 on four locations: Bistrec I, Bistrec II, Bošćak I and Bošćak II. 17 groups of invertebrates were recorded, with the Amphipoda group dominating on all locations. Water quality was determined by Extended Biotic Index and Saprobity Index. According to the Extended Biotic Index water quality on both streams was class II, except in August when it was class III. Saprobic index of Bistrec shows class II water, while on Bošćak it varies between class II and III. Beside macrozoobenthos analysis, physico-chemical parameters were measured