Brackish-water phytoplankton of the Flemish lowland by A.G. Caljon

By A.G. Caljon

Numerous papers were released at the animal and algal groups of fresh-water and marine biotopes, and their relation to the actual and chemical components in their surroundings. Brackish-water biotopes were studied less intensely, possibly because of their constrained distribution and to the complexity in their bioco­ enoses, composed of fresh-water, brackish-water and marine organisms. The diminished measurement of the species current types a supplementary hassle, that's specially mentioned within the algal groups, a huge a part of that are composed of nanno-phytoplankters. The collage of Ghent thought of a close survey sufficiently appealing to establish a result of excessive species variety, the gaps within the wisdom of brackish-water nannophytoplankton on the species and inhabitants degrees, and the handy proximity of brackish-water biotopes. additionally, the brackish-water biotopes proved to be precise, and encompass a chain of landlocked creeks, con­ nected to the ocean via an underground salt water provide. VII Contents bankruptcy 1 creation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 bankruptcy 2 research quarter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . three 2. 1. Topographical scenario . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . three 2. 2. old facets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . four 2. three. Edaphic elements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . five 2. four. Hydrology. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . five 2. four. 1. Salinity fluctuations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . five 2. four. 2. starting place of the brownish color of definite creeks. . . . . . . . . . . . . . . . . . . . . . . . 6 2. four. three. Hydrography. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2. five. Biotopes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2. 6. Climatic positive factors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 bankruptcy three equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . eleven three. 1. Sampling approach. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . eleven three. 2. actual houses, water chemistry, chlorophyll a and phaeophytin a . . . . . . . . . . . . . eleven three. three. Phytoplankton samples. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 three. four. Periphyton and benthos samples. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Ammonia in the Grote Geule (1), the Rode Geule (2) and the Boerenkreek (10) is positively correlated with other nutrients and negatively with chlorophyll a, surface area of the total phytoplankton and dissolved oxygen (Fig. 9). In the Kapellenpolderkreek (5), ammonia is negatively correlated with dissolved oxygen but positively with chlorophyll a and surface area of the total phytoplankton. This inverse relation relates to the fact that phytoplankton density and ammonia (and other nutrient salts) increased with the desiccation of this creek.

Evolution of nitrate in the landlocked creeks of East Flanders. ~'--'---'--r--'--' FMAM JJ 1973 ASONDJF 1974 Fig. 29. Monthly variation in dissolved oxygen in the Grote Geule (1), Rode Reule (2), Kapellenpolderkreek (5) and Boerenkreek (10). 12. Active chlorophyll a of the total phytoplankton Three maxima could be distinguished in the seasonal course of active chlorophyll a in the total phytoplankton of the Grote Geule (1): winter, spring and late summer. The same three maxima also occurred in the Rode Geule (2).

I I ,it I' ,,'' \\1 / \ \ " , I \ I ,I I I ,! I I-/ / , , ,, o a '" J 1974 I /\ ! • -,..... 0~ 2,5 \ ! , ! ,/ , / ,,. / i. 9 F ........... \. M A ~--. L_ .... _ "\ ~.. J , , a36,O A s Creek 10 DESICCATED Creek 5 o N // / --- ........ o i / ,, ~ '\ ...... 8 .. _- ,- , ! ,'1 ---- , 7,8 kreek (10). Fig. 25. ' n itri te - .. -~' ~ j. 5 1~~ \ w w 34 that the activity of nitrifying bacteria is low in winter 10°C) and ammonia is only partially oxidized to nitrite and nitrate. High ammonia in winter may also be explained by a reduced consumption of ammonia by the phytoplankton.

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