The Composition of Macrozoobenthos Communities on Selected Sites of the Krupa River, Tributary of the River Vrbas

Balta Marina1, Bilbija Branka2


1 Vrbaska 147, 78400 Gradiška

2 Faculty of Science, Mladena Stojanovića 2, 78000 Banja Luka




Research was conducted from April to August of 2014. We identified the presence of 4552 individuals from 18 taxa. The greatest taxa diversity was recorded in August, while the highest number of individuals was recorded in April. In April and August, the highest community density was registered among Ephemeroptera, compared to June where Gammarus sp. appears as the most abundant taxon. Gammarus sp., Ephemeroptera and Chironomidae larvae emerge from April to August at all sites. Based on Trent Biotic Index, the water quality in the Krupa River was assessed as a class I - II. The highest value of faunal similarity (90%) was recorded in April between the first and second site, while the lowest value was recorded in June between the second and fourth sites (53%). It was pointed out that the Krupa River still maintained relatively clean water despite a great influence from anthropogenic factors.

Keywords: water macroinvertebrata, benthos, water bonity, faunal similarity.



Krupa on Vrbas is a populated city located 25 km south of Banja Luka, where the Vrbas River leaves the canyon and enters the Krupsko field (Figure 1). It flows through this area (and empties into the Vrbas River) as a subterranean river, which is called the Krupa in its lower stream.

The Krupa River is actually a part of the Ponor River. The Ponor River is a unique hydro- geomorphological phenomenon, made of several small rivers which originate mainly on Lisina Mountain, and sinks beneath the southwest side of Manjača Mountain and emerges again on Krupa on the Vrbas.

The source of the Krupa River is about 3 km west of Krupa on the Vrbas. The source is a tectonic downward-type, and the water stream well is located at the merging point of cretaceous limestone and neogene sediments (Vodoprivredna osnova sliva rijeke Vrbas, 1989).

The spring is located in a populated area and it consists of three karst springs, which unite to form the Krupa River. The water rises at all three sources from the surface, which is rocky and overgrown with aquatic plants.

The conducted research is a continuation of the research initiated in 2010 (Pavlović, et al., 2011). Study of zoobenthos communities along the Krupa River were carried out within ichthyofaunistic research of the Vrbas River (Aganović et al, 1975; Kosorić et al., 1985). Similar studies in the region were conducted in Croatia on the Sutli River (Ćuka et al., 2009) and in Serbia on the Ribnica River, Lepenica River (Jović et al. 2006) and Jablanica River (Stefanović et al., 2009).


Figure 1: Cartographic display of Krupa on Vrbas. (