TESTING OF THE ZOOPLANKTON MEAN SIZE … & Calkiewicz: Testing of the Zooplankton Mean Size and Total Stock (MSTS) Indicator … Frequencyofsamplingduringthesummerperiodattheopen-waterstationswas

TESTING OF THE ZOOPLANKTON MEAN SIZE AND TOTAL STOCK (MSTS) INDICATOR IN THE SOUTHERN BALTIC SEA

Piotr Margonski & Joanna Calkiewicz

National Marine Fisheries Research Institute, Gdynia, POLAND

Margonski & Calkiewicz: Testing of the Zooplankton Mean Size and Total Stock (MSTS) Indicator …

Location of the zooplankton monitoring stations being the Polish contribution to the HELCOM COMBINE Programme. The longest data series (since 1979) were collected at deepwater stations in the Polish EEZ. In most of the cases, samples were taken 5 times per year using the WP-2 net (100 µm).


Frequency of sampling during the summer period at the open-water stations wastemporarily unbalanced as we have years with clear domination of samples takenat the beginning of the summer or in the end only. Thus, we decided to test thebest month which for those stations appeared to be August. To fill the gaps in thedata-series we regarded samples taken late in July or at the beginning ofSeptember as a good proxy of August conditions (highlighted in yellow).

P16 7 8 9

1986 1986-06-10 1986-07-29 x1987 1987-07-01 1987-08-07 1987-09-171988 1988-06-161989 1989-06-06 1989-08-11 1989-09-201990 1990-06-29 1990-08-21 1990-09-131991 1991-06-20 1991-08-23 1991-09-301992 1992-06-11 1992-08-22 1992-09-201993 1993-06-16 x 1993-09-121994 1994-07-05 1994-08-071995 1995-08-081996 1996-08-04 1996-09-251997 1997-06-0619981999 1999-06-13 1999-08-11200020012002 2002-06-10 2002-07-31 x 2002-09-282003 2003-09-172004 2004-06-03 2004-08-05 2004-09-202005 2005-06-02 2005-08-13 2005-09-132006 2006-08-08 2006-09-072007 2007-06-01 2007-08-02 2007-09-062008 2008-06-09 2008-08-04 2008-09-072009 2009-06-05 2009-08-06 2009-09-072010 2010-06-11 2010-08-05 2010-09-102011 2011-06-01 2011-08-04 2011-09-072012 2012-06-14 2012-08-02 2012-09-062013 2013-06-06 2013-08-08 2013-09-122014 2014-06-07 2014-08-05 2014-09-12

20 4 23 20

P56 7 8 9

1979 1979-08-221980 1980-06-13 1980-09-211981 1981-06-04 x 1981-09-121982 x 1982-09-031983 x 1983-09-021984 1984-06-03 1984-07-27 x 1984-09-031985 x 1985-09-041986 1986-06-13 1986-07-31 x 1986-09-111987 1987-06-26 1987-08-05 1987-09-181988 1988-06-18 1988-08-071989 1989-06-08 1989-08-13 1989-09-221990 1990-06-27 1990-08-26 1990-09-111991 1991-06-22 1991-09-291992 1992-06-09 1992-08-20 1992-09-221993 1993-06-18 1993-08-151994 1994-07-07 1994-08-051995 1995-08-101996 1996-08-06 1996-09-271997 1997-06-0819981999 1999-06-11 1999-08-1320002001200220032004200520062007 2007-08-07 2007-09-112008 2008-06-03 2008-08-07 2008-09-042009 2009-06-02 2009-08-04 2009-09-082010 2010-06-08 2010-08-03 2010-09-072011 2011-06-07 2011-08-02 2011-09-062012 2012-06-12 2012-08-06 2012-09-042013 2013-06-04 2013-08-06 2013-09-102014 2014-06-04 2014-08-06 2014-09-09

20 3 25 21

P1406 7 8 9

1979 1979-08-161980 1980-06-15 1980-09-201981 1981-06-07 x 1981-09-111982 1982-06-01 x 1982-09-111983 x 1983-09-041984 1984-07-28 x1985 1985-07-17 x1986 1986-06-12 1986-07-30 x 1986-09-101987 1987-06-25 1987-08-06 1987-09-181988 1988-06-171989 1989-06-07 1989-08-12 1989-09-211990 1990-06-28 1990-08-27 1990-09-121991 1991-06-21 1991-08-24 1991-09-281992 1992-08-21 1992-09-211993 1993-06-17 1993-08-141994 1994-07-06 1994-08-061995 1995-08-091996 1996-08-05 1996-09-261997 1997-06-071999 1999-06-12 1999-08-122002 2002-06-10 2002-08-012003 2003-09-182004 2004-06-04 2004-08-05 2004-09-262005 2005-06-03 2005-08-11 2005-09-142006 2006-08-11 2006-09-132007 2007-06-01 2007-08-06 2007-09-102008 2008-06-06 2008-08-06 2008-09-042009 2009-06-01 2009-08-03 2009-09-072010 2010-06-07 2010-08-02 2010-09-072011 2011-06-02 2011-08-01 2011-09-052012 2012-06-11 2012-08-03 2012-09-032013 2013-06-03 2013-08-05 2013-09-092014 2014-06-07 2014-08-06 2014-09-08

23 4 29 23


For the two coastal stations the analysis of September samples seemed to bebetter solution (ZP6 – station located in the Puck Bay and KW – the one in theVistula Lagoon).

ZP66 7 8 9

1999 1999-06-222002 2002-06-26 2002-08-06 2002-09-122003 2003-09-1220042005 2005-06-14 2005-08-03 2005-09-222006 2006-08-24 2006-09-252007 2007-06-06 2007-07-11 2007-08-24 2007-09-242008 2008-07-23 2008-08-27 2008-09-302009 2009-06-06 2009-07-17 2009-08-17 2009-09-172010 2010-06-28 2010-07-27 2010-08-26 2010-09-142011 2011-06-29 2011-08-24 2011-09-202012 2012-06-20 2012-07-25 2012-08-29 2012-09-132013 2013-06-26 2013-07-25 2013-08-27 2013-09-262014 2014-06-10 2014-07-21 2014-08-12 2014-09-05

10 7 11 12

KW6 7 8 9 9

1999 1999-06-072003 2003-09-112004 2004-06-23 2004-09-092005 2005-06-17 2005-07-29 2005-09-212006 2006-08-25 2006-09-262007 2007-08-29 2007-09-182008 2008-07-11 2008-08-14 2008-09-182009 2009-07-07 2009-09-182010 2010-06-29 2010-08-16 2010-09-242011 2011-07-26 2011-08-23 2011-09-01 2011-09-192012 2012-06-29 2012-07-12 2012-08-21 2012-09-182013 2013-06-17 2013-08-22 2013-09-192014 2014-06-11 2014-08-29 2014-09-30

7 5 8 1 12


Reference periods assessed based on chlorophyll a EQR data were taken from theRCO-Scobi model (Meier et al., 2012).


Results for station P1 (Gdansk Basin).

GES values were calculated as the lower99% CI of the time series (after Box-Coxtransformation if needed).

For lower panels the black horizontal barsare presenting the extension of thereference periods, blue lines indicateCuSum, and the lower red dashed lines arethe thresholds for CuSum

It seems to be a bit too optimistic picture …


Results for station P5 (Borholm Basin).




Results for station P140 (the southernslope of the Gotland Basin).




Results for station KW (Vistula Lagoon).


For lower panels blue lines indicate CuSum,and the lower red dashed lines are thethresholds for CuSum.

Time series was too short to be linked withreference periods.


Results for station ZP6 (Puck Bay).


For lower panels blue lines indicate CuSum,and the lower red dashed lines are thethresholds for CuSum.

Time series was too short to be linked withreference periods.


Summary table with suggested GES values (those results are still prliminary)

Station and its location GES values for Mean Size

and Total Biomass

(µg wet weight/mg m-3).

Reference periods

P1 (Gdansk Basin) 10.2/102.8 RefConFish/RefConFish

P5 (Bornholm Basin) 12.2/223.0 RefConChl/RefConChl

P140 (the southern slope of the

Gotland Basin)

11.6/156.3 RefConFish/RefConFish

KW (Vistula Lagoon) 7.7/272.9 NA

ZP6 (Puck Bay) 3.3/47.6 NA


Summary and further steps:

• calculation of GES values seems to be sensitive to the length and temporalallocation of the reference periods (more tests are needed),

• for presented calculations the individual body masses were standarized over theentire data series but we will test also the total abundance (TA) instead of totalbiomass (TB) to verify if the temporal patterns are the same (i.e. consistent withthe TB approach),

• sub-regional intercalibration is needed once all the results are available (weagreed to start with BY-5 data from SE, DE, and PL.

Documents

TESTING OF THE ZOOPLANKTON MEAN SIZE … & Calkiewicz: Testing of the Zooplankton Mean Size and Total Stock (MSTS) Indicator … Frequencyofsamplingduringthesummerperiodattheopen-waterstationswas