Biodiversity – probability (a chance) of meeting individuals belonging to the different species The higher probability – the higher diversity

Factors influencing the probability Number of individuals (density) Number of taxa Threatened Endemics Relicts Rare Bioindicators Commercial Predators Herbivores List of taxa: Sp. 1 Sp. 2 Sp. 3 Sp. 4 Sp. 5 Sp. 6 Sp. 7 Sp. 8 Sp. 9 Natural geogr. distr. Historical reasons

Information for site evaluation & conservation measures Knowledge on: Density Geogr. Distr. Taxa categories Information for site evaluation & conservation measures (RAP approach)

Information management, protection & conservation measures Knowledge on: Density Geogr. Distr. Taxa categories Monitoring system Information management, protection & conservation measures

How to identify (measure) biodiv. (COP/3/13, p. 10 – should be transparent, pragmatic, scintific principals) Need to know: taxa numbers - taxa density Biodiv. Index (p. 3 CBD/SBSTTA/3/7 Nor possible to identify all Not possible to give density of all taxa (p. 6 & 10 BBD/COP/3/13 Not possible to estimate biodiv. Of the whole ecosystem

What possible? To measure biodiv. of certain taxocenosis, eg. Chironomids of sandy lake sediments, or: Diversity of particular groups, like: Molluscs Hirudinea Turbellaria Gastrotricha, etc Other groups depending on: -access to the id. keys -specialists available -time -money Best known – indicatory Groups – RBA approach p. 36, 37, 39, 42 CBD/COP/3/13 With time better and better biodiv. evaluation