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Transitional and freshwater bioassessments: one site, two perspectives?
J M Neto1, M J Feio1, H Teixeira1
1IMAR - Institute of Marine Research, Marine and Environmental Research Centre, Faculty of Sciences and Technology, University of Coimbra, 3004-517 Coimbra, Portugal.
Marine Pollution Bulletin
|November 20, 2013
Summary
Comparing sampling protocols for transitional waters revealed initial differences in macroinvertebrate communities. Harmonizing assessment methods improved agreement, crucial for effective River Basin Management Plans.
Area of Science:
- Ecology
- Environmental Science
- Water Quality Assessment
Background:
- Transitional water zones (ecotones) present unique ecological challenges for water quality assessment.
- Standardized methodologies are crucial for consistent monitoring across diverse aquatic ecosystems.
Purpose of the Study:
- To compare the agreement of freshwater and estuarine sampling protocols and assessment tools in transitional water zones.
- To evaluate the impact of different protocols on macroinvertebrate community composition and quality assessments.
- To explore harmonization strategies for water quality assessment across adjacent water categories.
Main Methods:
- Analysis of macroinvertebrate communities using two distinct sampling protocols (freshwater and estuarine).
- Application of two assessment methodologies (IPtIs and BAT tools) with indices like IBMWP and AMBI.
- Modification of index sensitivity scores to harmonize assessments.
Main Results:
- Initial use of different protocols led to significant differences in macroinvertebrate communities, index scores, and quality classes.
- Harmonization of sensitivity scores for IBMWP and AMBI indices substantially reduced assessment discrepancies.
- Modified assessments resulted in coincident quality classes between IPtIs and BAT tools.
Conclusions:
- Harmonizing assessment metrics is essential for consistent water quality evaluation in transitional zones.
- Effective harmonization facilitates the accomplishment of River Basin Management Plans under the Water Framework Directive.
- Standardized approaches are vital for managing interconnected freshwater and transitional water bodies.
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