Zlatko Mihaljević, Ana Previšić, Igor Stanković Dept. of Biology, Faculty of Science, Univ. of Zagreb Development of Development of biological assessment biological assessment systems for rivers and systems for rivers and lakes – benthic lakes – benthic macroinvertebrates macroinvertebrates European Union Twinning Project Implementation of the WFD in Croatia
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Development of biological assessment systems for rivers and lakes – benthic macroinvertebrates
European Union Twinning Project Implementation of the WFD in Croatia. Development of biological assessment systems for rivers and lakes – benthic macroinvertebrates. Zlatko Mihaljević, Ana Previšić, Igor Stanković Dept. of Biology, Faculty of Science, Univ. of Zagreb. - PowerPoint PPT Presentation
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Zlatko Mihaljević, Ana Previšić, Igor StankovićDept. of Biology, Faculty of Science,
Univ. of Zagreb
Development of biological Development of biological assessment systems for assessment systems for
rivers and lakes – benthic rivers and lakes – benthic macroinvertebratesmacroinvertebrates
European Union Twinning ProjectImplementation of the WFD in Croatia
Surface water quality monitoring in Surface water quality monitoring in CroatiaCroatia
• continuous monitoring in Republic of Croatia started in the 1950’
• Water quality monitoring is mainly based on physico-chemical parameters
• since 2000 water quality assessment is significantly improved
• sampling and assessment of water quality is done in accordance with Croatian (HRN) or international norms (ISO-EN) in authorized laboratories.
Biological surface water quality determinants being monitored according to Water Classification Act (“National Gazette” , NN 77/98) are:
Saprobic index (Pantle – Buck), Extended Biotic Index and Trophy status (lakes)
Bioindicator system that is currently in use in Croatia: Wegl (1983)Wegl (1983)
Comparison of water quality indicesComparison of water quality indices
Mountain stream Large lowland river - middle reach
Comparison of water quality indicesComparison of water quality indices
Crenal section Mountain river - middle reach
Need for revision of the water Need for revision of the water monitoring systemmonitoring system
• According to WFD water bodies as primary water According to WFD water bodies as primary water management units must be nominated;management units must be nominated;
• Prevent deteriorationPrevent deterioration,, rreduce pollutioneduce pollution and achieve good and achieve good status ofstatus of aquatic ecosystems; aquatic ecosystems;
• Information on ecological quality status must be obtained;Information on ecological quality status must be obtained;• BQE – Aquatic flora: Phytoplankton, Macrophytes, BQE – Aquatic flora: Phytoplankton, Macrophytes,
• Information on water bodies` ecological quality are Information on water bodies` ecological quality are prerequisite for establishment of management plans.prerequisite for establishment of management plans.
• For WFD implementation a multimetric method for assessing For WFD implementation a multimetric method for assessing the ecological statusthe ecological status of rivers is in preparation.of rivers is in preparation.
Application of AApplication of AQEMQEM sampling protocols sampling protocols
• Implementation of AQEM methodology in CroatiaImplementation of AQEM methodology in Croatia– Project: Project: “Ecological Research of freshwater in “Ecological Research of freshwater in
Croatia regarding criteria of the Water Croatia regarding criteria of the Water Framework Directive of EU”Framework Directive of EU”
• Its application is under developmentIts application is under development
• Definition of type specific reference conditionsDefinition of type specific reference conditions
• Required modification;Required modification;– Integration of HRISIntegration of HRIS– Characteristic type-specific species (Dinaric Characteristic type-specific species (Dinaric
• 3 type specific watercourses for each 3 type specific watercourses for each eco/subecoregion; eco/subecoregion; – Mountain streamsMountain streams– Mountain riversMountain rivers– Lowland riversLowland rivers
• Problems: selection of referent sites Problems: selection of referent sites (conditions) for the lowland rivers in the (conditions) for the lowland rivers in the Pannonian regionPannonian region– all rivers highly influenced (general degradation)all rivers highly influenced (general degradation)– historical data insufficienthistorical data insufficient
Preliminary revised typology for Croatia
Application of AApplication of AQEMQEM methodology methodology
Mutihabitat sampling – 80 sampling sites
All habitat types according to previous typology of freshwater ecotypes were sampled
- Saprobic Index (Pantle-Buck)- Shannon-Wiener- EBI
Metrics:
- number of EPT taxa- abundance of Trichoptera- number of taxa- total abundance- Index of Biocenotic Region- [%] EPT-Taxa- [%] Oligochaeta & Diptera- [%] Gatherers/Collectors- [%] littoral preferences- …
Suggested type specific sites Suggested type specific sites