Table 1ap. Numerical density (N) of principal plankton components their wet biomass (B) and whole wet plankton biomass (WPB) in lagoons and in principal channels generalized as means calculated for groups of stations with comparable environmental conditions in respect to benthic vegetation and pollution impact.
Lagoon,channel / Date / NN of stations considered / Phytoplankton / Planktonic microheterotrophs / Mesozooplankton / Whole plankton biomass
(WPB),
g m-3
B, mg m-3 / Share of Pico+ nanoalgae, % / Bacteria / Microzooplankton,
B, mg m-3 / N, 103 m-3 / mg m-3
N, 106 l-1 / B, g m-3 (Bb) / Zooflage
llates / Ciliates / Larvaceans
Polesenon / 25 .05 / 12 / 950 / 98 / 5.14 / 1.67 / 60 / 560 / 2 / 2.50 / 50 / 3.29
7,8,9,10,11 / 430 / 87 / 4.85 / 1.57 / 28 / 290 / 3 / 1.48 / 31 / 2.35
27.06 / 12 / 3720 / 95 / 10.1 / 2.81 / 120 / 750 / <0. / 0.28 / 5 / 7.41
7,8,9,10,11 / 1050 / 74 / 6.75 / 1.86 / 36 / 370 / 17 / 19.2 / 360 / 3.97
Bassan / 18.05 / 21,30a / 720 / 57 / 5.30 / 1.32 / 30 / 210 / 16 / 3.86 / 103 / 2.40
23,24,25,27,28 / 740 / 35 / 4.60 / 1.47 / 27 / 220 / 14 / 0.82 / 24 / 2.44
29.06 / 21,30a / 1730 / 42 / 6.20 / 1.80 / 20 / 520 / 5 / 2.50 / 33 / 4.11
23,24,25,2728 / 600 / 25 / 5.85 / 1.77 / 10.20 / 117 / 2.95
Ocaro / 15.05 / 13,14, / 680 / 40 / 6.60 / 1.60 / 70 / 340 / 3 / 5.90 / 80+ / 2.78
15,16,20 / 270 / 63 / 5.10 / 1.13 / 60 / 520 / 4 / 0.50 / 12 / 2.00
15.06 / 13, 14, / 1330 / 80 / 7.63 / 1.90 / 30 / 370 / 17 / 1.84 / 15 / 3.65
15,16,20 / 540 / 36 / 5.50 / 1.49. / 20 / 340 / 50 / 6.94 / 80 / 2.52
Marine channel / 27.06 / 32 / 690 / 78 / 5.10 / 1.77 / 510 / 1320 / 67 / 37.60 / 580 / 4.94
Fossa Orba channel / 27.06 / 6 / 390 / 95 / 8.40 / 2.16 / 350 / 1110 / 0 / 19.54 / 176 / 4.19
Exit channel / 29.06 / 35 / 1320 / 12 / 2.51 / 2.43 / 40 / 180 / 5 / 11.50 / 140 / 4.12
Table 2ap. Numerical density (N, 106 ml-1) and wet biomass (B, g m-3) of bacterioplankton and of chroococcoid cyanobacteria during their invasion in the Ca Pisani lagoons in August – September 2001, when their share in total phytoplankton biomass attained over 90%; PP- primary production, g C m-2 d-1.
Lagoon, 15channel / Date / NN of stations / Bacterioplankton / PhytoplanktonN / B / PP / N / B
Polesenon / 15.08 / 12 / 12.0 / 3.60 / - / 1.60 / 4.8
7, 8, 11* / 11.5 / 2.98 / - / 1.21 / 2.9
9, 10* / 9.2 / 2.20 / - / 0.43 / 1.3
Bassan / 15.09 / 12 / 6.8 / 1.71 / 3.05 / 16.70 / 60.0
26.08 / 21 / 18.0 / 4.70 / 2.26 / 17.20 / 43.00
30a / 10.3 / 2.57 / 0.42 / 2.28 / 5.7
23, 24, 27, 28* / 11.8 / 3.53 / -
15.09 / 25 / 5.1 / 1.28 / 1.57 / 9.20 / 32.2
Ocaro / 25.08 / 13, 14* / 12.7 / 2.90 / - / 26.48 / 66.2
15, 20* / 5.4 / 1.77 / - / 4.12 / 10.3
25.09 / 13 / 9.5 / 2.09 / 2.90 / 22.8 / 68.4
15 / 7.3 / 1.83 / 1.35 / 9.00 / 31.7
Marine channel / 14.08 / 32 / 5.2 / 1.27 / - / 3.12 / 9.7
Fossa Orba channel / 14.08 / 6 / 19.0 / 8.55 / - / 12.83 / 32.1
Exit channel / 20.08 / 35 / 4.7 / 1.43 / - / 0.75 / 2.2
03.09 / 35 / 15.5 / 4.02 / 1.43 / 8.80 / 22.9
*Data are given as means
Table 3ap. Results of macrozoobenthos quantification in the Ca'Pisani lagoons in May-June 2001: abbreviations for the molluscan taxa
found in the samples: ce – Cerastoderma;ab – Abra;cy – Cyclope.
Lagoon,date / NN of stations
considered / Numerical density per m2 / Total biomass, wet weight (with shells)
Molluscs / Polychaetes / Chironomids / g m-2 / Share of molluscs, % (mean)
Polesenon,
20.05 / 7 and 8 / 100-350 (ab, cy) / 25-225 / 125-375 / 67-133 / 56
8, 9, 9a and 10 / 100-225 (ab) / 0-18 / 225-600 / 12-65 / 73
11 and 12 / 400-450 (ab, ce) / 0-300 / 0 / 103-194 / 93
Bassan,
18.05 / 21 / 200 (cy) / 125 / 1500 / 125 / 56
25 / 2375 (ab) / 2 / 250 / 500 / 98
23a / 500 (ab) / 1400 / 0 / 350 / 68
28 / 125 (ab) / 25 / 500 / 52 / 72
22, 23 and 30a / 0 / 25-200 / 250-2500 / 34-64 / 0
24 27 / 0 / 0 / 750-1500 / 11-25 / 0
Bassan,
15.05 / Under the layer of nitrophylic
macrophytes / In vicinity of st. 27a / 50 (ab) / 100 / 750 / 22 / 45
Under the Zostera thicket / 1250 (ab, ce, cy) / 150 / 0 / 590 / 97
In pool free of bottom vegetation / 1800 (ab, ce, cy) / 200 / 0 / 371 / 90
Ocaro / 14a / 400 (ce, cy, ab) / 25 / 150 / 380 / 93
16 / 2850 (ab, cy, ce) / 25 / 250 / 560 / 96
20 / 1900 (ab, cy) / 25 / 875 / 284 / 94
13 / 75 (ab) / 0 / 250 / 13 / 76
14 and 15 / 0 / 0-175 / 150-200 / 3-31 / 0
Table 4ap. Dissolved inorganic phosphorus content (DIP) and parameters of its dynamics in the Polesenon lagoon and in channels during the bloom of picocyanobacteria; designations: B – biomass of picocanobacteria, At – uptake rate of DIP by microplankton and T – its residence time.
Site / NN of stations / Date / B,g m-3 / DIP,
M / At, nM l-1
min-1 / T,
min
Marine channel / 32 / 14.08 / 9.7 / 0.4 / 28 / 14
Fossa Orba channel / 6 / 16.08 / 32.1 / 1.6 / 33 / 48
Polesenon lagoon / 8 / 15.08 / 4.8 / 0.8 / 14 / 57
same / 12 / 15.09 / 60.0 / 1.1 / 55 / 20
same / 8 / 03.09 / 10.03 / 0.9 / 24 / 38
Exit channel / 32 / 03.09 / 22.9 / 0.4 / 11 / 36
Table 5ap. Mean values of key environmental parameters in some coastal Adriatic lagoons variously stressed by pollution and eutrophication; abbreviations: DO-early morning d[ssolved oxygen saturation,%; DO – dissolved oxygen and LOM – suspended and labile organic matter in water; Ptot – total phosphorus in the non-filtered water, KS – labile sulfis in upper layer of bottom sediments, PP and DR – primary production of organic matter in the surface water layer and its decomposition rate in water column, PHP –biomass of phytoplankton, BP – bacterioplankton, MIZ and MEZ – micro- and mesozooplankton, WPB – whole plankton biomass, BZB – biomass of macrozoobenthos , BBV – biomass of benthic vegetation; designations for dominant groups of benthic vegetation: ZS – Zostera, ZCE – Zostera overgrown by Ceramium, CL- Cladophora, UL – Ulva, CH – Chaetomorpha, GR– Gracilaria.
General environ-mentalsituation in the basin, date / Lagoon / Chemical parameters / Biomass of plankton (wet weight),
g m-3 / BZB,
g m-2 / Benthic vegetation / Early morning DO saturation,%
Organic matter in water, mg C l-1 / Ptot,
M l-1 / KS,
mg S dm-3 / PP,
g C l-1 d-1 / DR,
mg O2 l-1 d-1 / PHP / BP / MIZ / MEZ / WPB / BBV, kg m-2 / Domina-tion
SOM / LOM
Quasi-pristine, mid September
1993 / Venice lagoon (southern basin) / 0.7 / 1.8 / 1.6 / 280 / 87 / 0.45 / 0.36 / 0.57 / 0.10 / 0.26 / 1.3 / 360 / 2.5 / ZS / 85
Destabilized by intense waste-water discharge,
August 1993 / Polesenon / 10.6 / 11.3 / 8.1 / 1440 / 4600 / 9.30 / 26.8 / 5.33 / 4.27 / 0.03 / 9.63 / 65 / 0.3 / CL, UL / 0
Bassan / 16.9 / 9.7 / 6.3 / 1480 / 4420 / 6.51 / 88.9 / 6.45 / 13.80 / 0.15 / 20.40 / 110 / 2.4 / CH, UL, Cl / 0
Improved after the melioration
July 1995 / Polesenon / 2.0 / 5.2 / 2.9 / 270 / 70 / 2.2 / 1.67 / 0.64 / 0.34 / 0.15 / 2.80 / 360 / 3.6 / ZS, CL / 45
Bassan / 2.5 / 4.9 / 3.1 / 110 / 195 / 2.8 / 3.50 / 1.05 / 0.41 / 0.25 / 5.21 / 430 / 2.8 / ZS / 52
Ocaro / 2.3 / 4.1 / 1.8 / 230 / 260 / 1.8 / 6.39 / 0.80 / 0.78 / 0.40 / 8.39 / 910 / 1.5 / ZS, CL / 60
Destabilized again same way, end of July 2001 / Polesenon / 3.8 / 3.7 / 6.6 / 820 / 485 / 1.36 / 1.94 / 1.67 / 0.42 / 0.04 / 5.10 / 78 / 3.8 / CH, UL, CL,
ZCE / 8
Bassan / 1.8 / 3.2 / 3.4 / 662 / 278 / 1.17 / 0.88 / 1.80 / 0.26 / 0.09 / 3.22 / 88 / 5.2 / CH, UL, GR, ZCE / 14
Ocaro / 3.1 / 3.9 / 5.5 / 735 / 275 / 1.06 / 0.94 / 1.70 / 0.43 / 0.04 / 2.90 / 102 / 4.5 / CL, UL / 10