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Lakes - Central GIG progress report July 2004

Presented by Sandra Poikane from the Joint Research Centre, this report discusses intercalibration parameters for lakes in 12 countries, such as chlorophyll levels, phytoplankton species composition, and macrophyte vegetation analysis.

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Lakes - Central GIG progress report July 2004

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  1. Lakes - Central GIG progress reportJuly 2004 Presented bySandra PoikaneJoint Research CentreInstitute for Environment and SustainabilityInland and Marine Waters Unit

  2. 12 countries • Belgium • Czech Republic • Denmark • Estonia • France • Germany • Hungary • Latvia • Lithuania • Netherlands • Poland • Slovakia • United Kingdom

  3. Central GIG - Lakes • <

  4. Common IC types • Lowland, very shallow, calcareous, • Lowland, shallow, stratified, calcareous • Lowland,shallow , siliceous, vegetation dominated by Lobelia

  5. Discussion on Intercalibration parameters • Chlorophyll a • Phytoplankton – species composition • Macrophyte vegetation - species composition, abundance

  6. Chlorophyll a - relatively easy ! • What kind of chlorophyll data to ask? - average value of vegetation season - maximum value of late summer • How to aggregate data ? The mean value would be the most appropriate

  7. Chlorophyll a - relatively easy ! • What time period to choose ? The vegetation period (described as April – October or 2 weeks after ice – break) • Sampling method ? to report the sampling methods, preferably surface sample • Analyses methods ? to report the extraction methods, anyway data should be comparable between different methods • How many years ? if possible, average and maximum values for the last 5 years

  8. Phytoplankton species composition Which parameter ? • Abundance (cells/l) • Biomass (mg/l) • Biomass (% of the total biomass) • Numerical scale for dominant species

  9. Phytoplankton species composition • to ask for 5 dominant taxa (even in case, if there are no pronounced dominants) • to choose late summer dominant species • dominance based on biovolume or considering the typical cell volume • to provide numerical scale for dominant species (see table) • species or genus level

  10. Macrophyte vegetation

  11. Macrophyte vegetation • 5 dominant taxa and maximal colonized water depth and the covered area (in % of lake ?) • use of ECOFRAME classification of abundance (5 levels) • only submerged plants • genus or species level • based on cover of littoral of deep lakes (3 – 15 m) or whole lakes for very shallow lakes (< 3 m)

  12. Common metrics for macrophyte vegetation ? 3 possibilities for a common metric: • submerged covered area • a list of indicator species which are present in reference conditions • deep lakes (>3 m): maximum colonised water depth

  13. Overview

  14. Data template for chlorophyll, P, Secchi,supporting data, pressure data

  15. Thank you for attention ! Deep hard light lakes(3-15 m, > 165 µS/cm, < 150 mgPt/l)

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