TYPE AND SITE SPECIFIC APPROACH - TWO WAYS OF DEFINING REFERENCE CONDITIONS FOR CZECH STREAMS: PROS AND CONS

KOKEŠ, Jií, Svtlana ZAHRÁDKOVÁ, Denisa NEMEJCOVÁ and John DAVY-BOWKER. TYPE AND SITE SPECIFIC APPROACH - TWO WAYS OF DEFINING REFERENCE CONDITIONS FOR CZECH STREAMS: PROS AND CONS. In Symposium River Bottom VI. Book of Abstracts. 2005th ed. Brno: Masarykova univerzita v Brn, 2005, p. 30.

Basic information

• Original name: TYPE AND SITE SPECIFIC APPROACH - TWO WAYS OF DEFINING REFERENCE CONDITIONS FOR CZECH STREAMS: PROS AND CONS
• Name in Czech: Typov-specifický a lokáln-specifický pístup - dva zpsoby definice referenních podmínek pro eské toky: pro a proti
• Authors: KOKEŠ, Jií (203 Czech Republic), Svtlana ZAHRÁDKOVÁ (203 Czech Republic, guarantor), Denisa NEMEJCOVÁ (203 Czech Republic) and John DAVY-BOWKER (826 United Kingdom of Great Britain and Northern Ireland).
• Edition: 2005. vyd. Brno, Symposium River Bottom VI. Book of Abstracts, p. 30-30, 2005.
• Publisher: Masarykova univerzita v Brn

Other information

• Original language: English
• Type of outcome: Proceedings paper
• Field of Study: 10000 1. Natural Sciences
• Country of publisher: Czech Republic
• Confidentiality degree: is not subject to a state or trade secret
• RIV identification code: RIV/00216224:14310/05:00014734
• Organization unit: Faculty of Science
• Keywords in English: PERLA; RIVPACS; benthic macroinvertebrates; type-specific; site-specific; predictive modelling
• Tags: benthic macroinvertebrates, PERLA, predictive modelling, RIVPACS, site-specific, type-specific

Abstract

Assessment of the ecological quality of water bodies as required under the European Water Framework Directive is based on the comparison of reference and observed status. The Directive requires the definition of type-specific reference conditions for water bodies and offers two systems for deriving this typology: system A and system B, both based on abiotic descriptors. The site-specific approaches are based on a classification of benthic macro-invertebrate assemblages followed by discriminant analysis of environmental variables. A test site is then probabilistically assigned to one or more classification groups and a site-specific reference fauna is derived. Correspondence between the WFD physical typologies and a site-specific approach was investigated in the Czech Republic using PERLA (the site-specific model for the benthic macro-invertebrate assemblages). The discriminant strength of groups obtained by the site-specific model was better than those obtained by both the system A and system B typologies. We conclude that the site-specific approach is a better tool for defining reference conditions than the WFD physical typologies.

Abstract (in Czech)

Hodnocení ekologického stavu vod podle požadavk evropské Rámcové smrnice o vodách je založeno na srovnání referenního a pozorovaného stavu. Smrnice požaduje typov-specifický pístup k odvození referenních podmínek a nabízí dva pístupy pro odvození typologií" systém A a B, oba založené na abiotických deskriptorech. Lokáln specifický pístup je založen na klasifikaci makrozoobentosu, následované diskriminaní analýzou abiotických promnných. Hodnocená lokalita je pak pravdpodobnostn piazena k jedné nebo více klasifikaním skupinám a je odvozena fauna specifická pro danou lokalitu. Byla testována korespondence mezi fyzikálními typologiemi a lokáln-specifickým modelem pro eské toky (PERLA). Diskriminaní síla pro skupiny získané lokáln-specifickým pístupem byla vyšší než pro typologie odvozené systémem A i B. Dovozujeme, že lokáln-specifický pístup je lepším nástrojem pro odvození referenních podmínek než fyzikální typologie.

Links

• MSM 143100010, plan (intention): Name: Časoprostorová dynamika biodiverzity v ekosystémech střední Evropy.

Investor: Ministry of Education, Youth and Sports of the CR, Spatiotemporal biodiversity dynamics in ecosystems of Central Europe