Typology of Danubian fish assemblages

Frontiers in Marine Science

Tibor Eros¹  Zoltan Szaloky²  Vinzenz Bammer³  Lachezar Pehlivanov⁴  Michael Schabuss⁵  Agnes Irma Gyorgy⁶ 

[1] Centre for Ecological Research HAS, Balaton Limnological Institute;Centre for Ecological Research HAS, Danube Research Institute;Federal Agency for Water Management, Institute for Water Ecology;Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences;PRO FISCH OG Ecological Consultants;Research Institute of Agricultural Economics;

关键词: danube;    benthic habitat;    Large river;    Electrified trawl;    fish typology;   

DOI  :  10.3389/conf.FMARS.2015.03.00182

来源: DOAJ

【 摘 要 】

Environmental management needs well definable management units for the establishment of which typological approaches are often applied. However, inconsistent sampling strategies among countries can hinder large scale evaluation of aquatic assemblages for bioassessment purposes in very large transboundary rivers. We examined spatial changes in fish assemblages along the longitudinal profile of the Danube River, the second largest river in Europe, using a standardized sampling protocol, to define management units and thereby aid water management at the international level. The conventionally applied inshore electrofishing protocol was combined with sampling of offshore benthic habitats with an electrified trawl to provide a more accurate picture on fish assemblages, for the first time in any transboundary large river survey. We found that well definable assemblage classes can be set up at large spatial scales, although fish assemblages of relatively natural and impounded stretches show some separation. Contrary to the zonation concept many characteristic species could be found along the profile of the whole river, although indicator species analysis defined many character species for the typology classes. Results of the two sampling protocols complemented each other and revealed that multi gear evaluations are necessary for a better assessment of fish assemblages in very large rivers.

【 授权许可】

Unknown