Naslov
Invasive crustacean species in Croatian section of the Danube and Drava rivers

Autori
Hudina, Sandra ; Žganec, Krešimir ; Faller, Matej ; Gottstein, Sanja ; Lajtner, Jasna ; Maguire, Ivana ; Lucić, Andreja ; Erben, Radovan

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
NEOBIOTA: Towards a Synthesis 5th European Conference on Biological Invasions - Book of abstracts / - , 2008

Skup
NEOBIOTA: Towards a Synthesis 5th European Conference on Biological Invasions

Mjesto i datum
Prag, Češka Republika, 23.09.2008. - 26.09.2008

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
invasive crustaceans; Danube; Drava

Sažetak
Within last several decades European rivers have been invaded by numerous non-indigenous species (NIS). As presence, distribution and impact of invasive aquatic species in Croatia is mostly unknown, a project aimed at determining invasive species status has recently been initiated at the Department of Zoology, Faculty of Science, University of Zagreb. This work presents initial results of the research on distribution of invasive crustacean fauna in Croatia. Research was conducted at the Croatian section of Danube river (10 locations) and its tributary, river Drava (12 locations). Information on distribution of non-indigenous crustaceans has been gathered for the total of 27 sites (research and literature data for respective rivers). Baited LiNi traps and hand search were used for crayfish sampling and benthos nets for macrozoobenthos sampling. Literature data on invasive freshwater crustaceans in the respective rivers in neighbouring countries were also inspected in order to detect potential records in bordering areas. Altogether we recorded 10 non-indigenous invasive crustacean species: one decapod, five amphipods, one isopod and three mysidacea species. In the Danube river non-indigenous crustaceans were recorded at all sites, while in Drava they were recorded up to the 212th kilometre from river mouth. The spiny-cheek crayfish (Orconectes limosus) was caught only in the Danube and its smaller tributaries in the area of Nature Park Kopacki rit. The most widespread NIS was Dikerogammarus villosus (recorded at 17 of 27 sites). It was found at all sites in the main course of the Danube river, and at all sites in Drava River up to 212th kilometre upstream. At the most upstream site of its record, it coexists with the native species Gammarus roeseli. It is assumed that at examined Danube sites, Orconectes limosus has significantly reduced or displaced populations of native narrow-clawed crayfish (Astacus leptodactylus), which has not been recorded by our sampling. Following the defined size classes for O. limosus, caught specimens were 3– 4 years old, which indicates that the population has been established in the area for at least 5 years. Since one of the records was only 3 kilometres downstream from the confluence with Drava, there is a potential risk of O. limosus spread to Drava watercourse.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

POVEZANOST RADA