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Snejana Moncheva1, Maria Pantazi2, Larisa Pautova3, Laura Boichenko4, Dan Vassiliu4,Luydmila Mantzosh5 1Institute of Oceanology-BAS, Parvi Mai str., No.

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Presentation on theme: "Snejana Moncheva1, Maria Pantazi2, Larisa Pautova3, Laura Boichenko4, Dan Vassiliu4,Luydmila Mantzosh5 1Institute of Oceanology-BAS, Parvi Mai str., No."— Presentation transcript:

1 Snejana Moncheva1, Maria Pantazi2, Larisa Pautova3, Laura Boichenko4, Dan Vassiliu4,Luydmila Mantzosh5 1Institute of Oceanology-BAS, Parvi Mai str., No 40, P.O.Box 152, Bulgaria 2HCMR P.O. BOX 712, Anavissos 19013, Greece 3P.P Shirshov IO-RAS, 36, Nahimovski prospect, Moscow, Russia, NIMRD “Grigore Antipa”, Mamaia bul., No 300, Constanta 3, RO IBSS,2 Nakhimov Ave. Sevastopol, Ukraine Black sea OUTLOOK Conference, Odessa, October, 2011

2 The quality of biological data has gained a recognition as an essential part of international monitoring programmes, in response to the demand for strategic environmental evaluations such as the EU WFD, the MSFD etc. Informed decisions for environmental sound management can be made only on the basis of reliable data, and therefore certain level of data quality should be achieved to assure accuracy and precision of all measurement systems. The structural characteristics of phytoplankton communities bear valuable information about the evolution of microalgal communities and the trajectories of shifts under multiple environmental factors, including anthropogenic impacts. Details of phytoplankton analytical procedures are essential to compare data produced by different analysts either during a long-term monitoring programs in one area or between different areas in order to evaluate statistically significant long-term trends or spatial differences.

3 OBJECTIVES I - present results from the intercalibration excercise  assess the degree of comparability/differences in phytoplankton and chlorophyll a data analysis among 4 Black sea laboratories  and where possible to make recommendations for further improvement and harmonization of research methodology in the Black Sea. II present actions taken towards solutions The expectation is that the results will assist regional assessments based on combined data sets “Quality control of phytoplankton counting and biovolume estimates—an easy task or a Gordian knot?” E.Rott et all., 2007

4 MATERIALS AND METHODS Samples from two stations (coastal and open sea) were collected and distributed for laboratory analysis in 3 replicates for each partner (SESAME intercalibation cruise- Apri’2009) Map of sampling stations Phytoplankton attributes: Phytoplankton Total abundance [cells/l] Phytoplankton Total biomass (wet weight) – [mg/m3] Phytoplankton common Taxonomic classes (Bacillariophyceae, Dinophyceae, Prymnesiophyceae, Cryptophyceae and Small flagellates ). Chlorophyll a measurements Participants IBSS-Sebastopol - UkR NIMRD – RO IO-BAS – BG IO-RAS - RU Statistical analysis Robust statistical treatment (ANOVA test, Tukey test and a Lavene statistic) was applied in order to check the homogeneity of the variance between the groups. Stock plots were designed based on averages and standard deviation and the the Bray Curtis similarity index Common statistics employed during phytoplankton ring tests (average ±1 stdev and CV < 20 %).

5 Participant Sample concentration Counting chamberType of microscope Volume of subsample No cells counted per sample IO-BASDecantation Utermol Segwick Rafter Utermol Nicon inverted+ immage analysis1 ml400 cells NIMRD- Decantation Utermol Utermol Inverted 0.1 ml IO-RUS Decantation/inverse filtration Nogott’s up to 0.1 ml Nauman’s chamber 1 or 5 mlLight compound1 ml IBSSDecantation Nauman’s chamber 1 ml 0.05 mlLight compound0.1 ml Inventory of in-house lab methods PartnerExtractionSample preparationInstrument Equations reference IO-BAS90% acetone 24 hours extraction 7000 rpm cuvette 1cm LSpectrophotometer Jeffrey and Humphrey (1975) NIMRD90% acetone 24 hours extraction 4000 rpm cuvette 1cm LSpectrophotometer SCOR UNESCO (1968) IO-RAS90% acetone Fluorimeter Phytoplankton counts Chlorophyll a measurements

6 RESULTS Stock plot of the total phytoplankton abundance [cells/l - average and stdev] by partners The statistical treatment of total abundance data show significant differences between the Ukrainian-Bulgarian results and between the Ukrainian - Russian results, while the difference between Bulgarian and Russian data were not significant Similarity cluster matrix of total phytoplankton abundance [cells/l - square root transformation] by labs Hierarchical clustering showed similarity between Bulgarian and Russian data > 85% while between Ukrainian - Bulgarian and Ukrainian - Russian was > 75% ) Phytoplankton abundance

7 Countries / Tukey (HSD) / Analysis of the differences between the categories with a confidence interval of 95%: Contrast Differen ce Standardized difference Critical value Pr > Diff Signific ant BLG vs. UKR1,4175,5303,564 0,01 1 Yes BLG vs. RUS0,1990,8523,564 0,69 5 No RUS vs. UKR1,2175,2063,564 0,01 4 Yes Tukey's d critical value:5,04 Countries / Tukey (HSD) / Analysis of the differences between the categories with a confidence interval of 95%: Contrast Differ ence Standardized difference Critical value Pr > Diff Signifi cant UKR vs. RUS0,7627,9873,564 0,00 3 Yes UKR vs. BLG0,6396,1133,564 0,00 8 Yes BLG vs. RUS0,1231,2913,564 0,47 1 No Tukey's d critical value:5,04 Countries / Tukey (HSD) / Analysis of the differences between the categories with a confidence interval of 95%: Contrast Differe nce Standardized difference Critical value Pr > Diff Signific ant BLG vs. UKR1,4175,5303,564 0,0 11 Yes BLG vs. RUS0,1990,8523,564 0,6 95 No RUS vs. UKR1,2175,2063,564 0,0 14 Yes Tukey's d critical value:5,04 Phytoplankton abundance

8 Based on testing the reproducibility of the in-house analysis (replicates) and employing the CV < 20% assumption for the total numerical abundance the results reveal a good reproducibility of the in-house replicates and very close results between the different labs, with the exception of Ukraine, where the difference was between 25-30% Lab Average N [cells/l] stdev CV% BLG RUS UKR RO all BG/RO BG/RO/RUS Average abundance [cells/l] stdev and CV [%] by partners Average BAC [cells/l] stdevCV% RU BG RO UK All LAB Dinophyce ae average {cells/l] stdevCV % Prymnesio phyceae Average [cells/l] stdevCV%Small flagellates Average [cells/l] stdevCV % RU BG RO UK All The comparison of phytoplankton abundance results by taxonomic classes reveal compliance to the 20% CV only for Bacillariophyceae, while for the other classes the differences among the participating labs are substantial, especially critical for the small flagellates, where even the in-house results show inconsistencies for all partners Phytoplankton abundance

9 Stock plot of the total phytoplankton biomass [mg/m3 - average and stdev] by partners Countries / Tukey (HSD) / Analysis of the differences between the categories with a confidence interval of 95%: Contrast Differen ce Standardized difference Critical value Pr > Diff Signif icant UKR vs. RUS0,1923,3193,564 0,06 2 No UKR vs. BLG0,1151,8093,564 0,27 8 No BLG vs. RUS0,0781,3383,564 0,45 0 No Tukey's d critical value:5,04 Similar to the total abundance the hierarchical clustering of total biomass showed similarity between Bulgarian and Russian data > 85% while between Ukrainian - Bulgarian and Ukrainian - Russian was > 75% ) Phytoplankton biomass

10 Average B [mg/m3]stdevCV% RU BG RO UK All LABBacillari ophycea e Av B [mg/m3] stdevCV%Dino- phyceae Av B [mg/m3 stdevCV%Prymne sio phyceae Av B [mg/m3 stdevCV%Small flagell ates Av B [mg/ m3] stdevCV% RU BG RO UKR All Similar to the phytoplankton abundance at the level of taxonomic classes the differences among the participating labs are substantial, especially critical for Prymnesiophyceae and small flagellates, where even the in-house results show inconsistencies for all partners. Albeit the good agreement between the data among some of the labs this is not systematic for all the taxonomic groups Phytoplankton biomass

11 Bacillariophyceae 1.Cerataulina pelagica 2.Chaetoceros socialis 3.Chaetoceros curvisetus 4. Nitzschia tenuirostris 5. Proboscia alata 6. Pseudo-nitzschia p-delicatissima 7. Skeletonema costatum 8.Thalassionema nitzschioides Dinophyceae Ceratium fusus -1 Gyrodinium fusius -2 Heterocapsa triquetra -3 Prorocentrum compressum -4 Prorocentrum micans -5 Protoperidinium bipes -6 Protoperidinium granii -7 Scrippsiella trochoidea -8 Prymnesiophyceae Emiliania huxleyi Small flagellates For the common species biovolume comparative analysis reveal the differences are substantial, for the most abundant species such as Pseudo-nitzschia delicatissima and Emiliania huxley the biovolume varies more than twice ( mkm3 and mkm3 respectively ) for some species the differences exceeding 3 fold Volume of subsampleNo species RUS157 BG159 RO0.139 UKR0.131 As expected the analyzed sub-sample volume is important for the species diversity (no of species) recorded in the samples

12 The results of chlorophyll a measurements reveal good in-house reproducibility for BG and RO and higher than 10% difference for RU lab - Table 18. The difference between the BG and RO data is within the (range average ±s 1stdev) StationBGRORORUS S-BG01-05 (M301) S-BG01-05 (M301) S-BG01-05 (M301) average stdev CV% S-BG S-BG S-BG average stdev CV% S-BG01-08 (M304) S-BG01-08 (M304) S-BG01-08 (M304) average stdev CV% Chlorophyll a [mg/m3]

13 For the total phytoplankton abundance the results between Bulgaria, Russia and Romania are comparable (insignificant differences) while the difference with Ukrainian lab is between 25-30% For the total phytoplankton biomass there is a good agreement between Romania and Ukraine, about 20% (acceptable) difference between Bulgaria and all other labs and a 30% difference between Russia, Romania and Ukraine. Both for the phytoplankton abundance and biomass at the level of taxonomic classes the differences are substantial especially for Prymnesiophyceae and Small flagellates. If taxonomic classes data would be used as one data set they should be treated with caution. The difference of chl. a results between BG and RO is about 10% and the data sets could be comparable. The BG and RO measurements are between higher than the RUS results. The results give ground for the following recommendations:  A phytoplankton check-list with unified geometric shapes for the different species is essential to avoid differences in the species biovolume estimation that reflect the final biomass results  Analysis of at least 1 ml counting chamber is highly recommended to better detect species diversity  In order to avoid taxonomic miss-match WoRMS taxonomy is mandatory CONCLUSSIONS and RECCOMENDATIONS

14 BLACK SEA COMMISSIONUP-GRADE BS SCENE PROJECT + Phytoplankton expert group Phytoplankton Workshop, Istanbul June 2010 CountryOrganisation Expert NameContact details BulgriaIO-BAS-BGAssoc. Prof. Snejana RomaniaNIMRD –,RODr. Laura Boichenko RussiaIO P.P.Shirshov, RAS,Dr. Alexander Mikaelyan Turkey,inop,TurkeyMr. Fatih UkraineIBSS, SebastopolMrs. Oleksandra UkraineIBSS, SebastopolDr. Vladimir UkraineIBSS, SebastopolDr. Yuliya UkraineIBSS, SebastopolMr. Denis UkraineBotanical Institute, KievDr. Alexander UkraineOdessa University, OdessaMrs. Natalia Black Sea Commission Permanent Secretariat Prof. Ahmet commission.org Black Sea Commission Permanent Secretariat Dr. Violeta Velikova commission.org Black Sea Commission Permanent Secretariat Mr. Vladimir acksea-commission.org Black Sea Commission Permanent Secretariat Ms. Nilufer

15 CHECK LIST OF BLACK SEA PHYTOPLANKTON, REFERENCE BIOVOLUMES and DATA BASE Software (Oleksandra Sergeyeva, Kseniia Skuratova IBSS, Sebastopol, Ukraine) The special software for creation of online marine species checklists was developed. This software is based on wiki engine and has special developed functions which make it easy to add, delete, move species and add any type of structured information in the form of patterns, which can be easily added by the checklist administrator on request of users. Each species has the corresponding page, where all information is placed either in form of predefined patterns or in the form of text, images, tables etc. on-line: Biovolume, shapes etc.(Bryantsteva Y., IBSS, Sebastopol, Ukraine) Efforts have been made to create one reference list of biovolumes for Black Sea microalgae. Thus for each species in the checklist the appropriate suggested figure to calculate biovolume was attached. For detailed research of morphometric characteristics of the community the more precise figure is also suggested where possible. on-line:

16 UPGRADE BLACK SEA SCENE GA , FP7, EC GUIDELINES FOR QUALITY CONTROL OF BIOLOGICAL DATA- PHYTOPLANKTON Snejana Moncheva November 2010

17 PHYTOPLANKTON MANUAL - updated

18 THE WAY FORWARD Finalise the check-list Phytoplankton expert group Finalise the automated system Apply the QC/QA guidelines to real data sets Finalise the data-base format Conduct ring tests Maintain the BS Commission web site operational !!!!

19 THANK YOU FOR THE ATTENTION Participants in theSESAME intercalibration cruise


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