Testing of Zooplankton indicators in the Baltic Sea waters of - - PowerPoint PPT Presentation

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Feb 21, 2024 371 likes •492 views

Testing of Zooplankton indicators in the Baltic Sea waters of Mecklenburg- Vorpommern, Germany Martina Stiasny, Geomar Marina Carstens & Mario v. Weber, LU/LUNG M-V HELCOM core indicator Mean size = Total zooplankton abundance/total

SLIDE 1

Testing of Zooplankton indicators

in the Baltic Sea waters of Mecklenburg- Vorpommern, Germany

Martina Stiasny, Geomar Marina Carstens & Mario v. Weber, LU/LUNG M-V

SLIDE 2

HELCOM core indicator

Mean size

= Total zooplankton abundance/total biomass

& Total stock

= Total abundance (or total biomass) Combined as MSTS (Mean Size - Total Stock) in a two-dimensional indicator

SLIDE 3

MSTS – Good Environmental Status

Poor ES: Small mean size and total stock Medium ES: Small mean size and high total stock OR Large mean size and small total stock Good Environmental Status: Large Mean Size and Total stock

Source: Elena Gorokhova/HELCOM ZEN

SLIDE 4

GES – reference period

Find periods with good Weight-at-age in Herring (Food web) good Chlorophyll-a levels (Eutrophication) Calculate mean MSTS for this period and use the lower 95% CI as GES boundary

SLIDE 5

LUNG Samples

LUNG Stations Open sea, but close to the coastal waters of Meckl.-Vorpommern July 2013 – September 2014

SLIDE 6

MSTS LUNG Samples

0,0002 0,0004 0,0006 0,0008 0,001 0,0012 0,0014 0,0016 0,0018 50000 100000 150000 200000 250000 300000 350000

Mean Size Total Abundance (Ind. m-3) O22 O5 O9 O11 O133 OB4

SLIDE 7

0,0002 0,0004 0,0006 0,0008 0,001 0,0012 0,0014 0,0016 0,0018 50000 100000 150000 200000 250000 300000 350000

Mean Size Abundance (Ind m-3) O22 O5 O9 O11 O133 OB4

Gulf of Finland Gulf of Riga 0.0063 0.0027

SLIDE 8

MSTS LUNG Samples

Eastern Stations Western Stations

0,0002 0,0004 0,0006 0,0008 0,001 0,0012 0,0014 0,0016 0,0018 50000 100000 150000 200000 250000 300000 350000

Mean Size Abundance (Ind m-3) O22 O5 O9 O11 O133 OB4 Probably necessary to define GES boundaries for the Eastern and Western coastline separately

SLIDE 9

LUNG & IOW Samples

SLIDE 10

Check possibility of matching IOW stations, further from the coast, to LUNG stations to

btain a longer-ranging data set

Use the IOW data to find GES reference periods Find Herring Weight-at-age Data and Chlorophyll-a Data to define GES

SLIDE 11

Other indicators

Copepod Biomass – as an indicator of good food quality for fish larvae Microphageous zooplankton biomass – as an indicator of eutrophication