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Promjene zajednica rakova u rijeci Dravi na dijelu toka od Preloga do Legrada
Šarec, M. (2021). Promjene zajednica rakova u rijeci Dravi na dijelu toka od Preloga do Legrada. MA Thesis. University of Zadar: Zadar. 59 pp.
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| Beschikbaar in | Auteur |
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Documenttype: Doctoraat/Thesis/Eindwerk
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| Trefwoorden |
Croatia, Drava R.
Amphipoda [WoRMS]; Dikerogammarus villosus (Sowinsky, 1894) [WoRMS]
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| Author keywords |
invasive Amphipoda, expansion, influence |
| Abstract |
Invasive species are one of the most important causes of biodiversity decline in freshwater ecosystems. This research was conducted to determine the influence of the invasive crustacean species Dikerogrammarus villosus on native crustacean species in the reach of the Drava river between Prelog and Legrad during five years in the period 2011 to 2019. This study aimed to examine the distribution and effect of Dikerogrammarus villosus expansion on native crustacean species. The field study was carried out at 27 sites between the upper end of the Dubrava Reservoir and its dam on the Drava River to the confluence of the Mura River. Qualitative samples of macrozoobenthos were collected with a benthic hand net on all available microhabitats and stored in 70% ethanol. After a laboratory analysis and the identification of crustacean samples to the species level, the results were analysed using graphic and spatial analyses. Four native and one alien invasive amphipod species were recorded (native: Gammarus fossarum, Gammarus roeselii, Synurella ambulans, and Niphargus sp.; alien: Dikerogammarus villosus), as well as one native isopod (Asellus aquaticus). In the main course of the Drava River, D. villosus has almost entirely replaced native species recorded in this study, while in the old course of Drava River (downstream dam of hydroelectric power plant Dubrava), D. villosus coexist with native species. During the study period, D. villosus has not spread into lower parts of the Bednja and Plitvica Rivers, although it was found at the confluences of these two tributaries in the Stara Drava. It is not expected that D. villosus will succeed in replacing native crustaceans in the Old Drava course downstream from the Dubrava dam. Microhabitat diversity and the diverse ecological conditions in the Old Drava may be the key factors that enable the coexistence of the native crustaceans with invasive D. villosus in this part of the Drava river |
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