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 elements in their setting. Brackish-water biotopes were studied less intensely, most likely because of their restricted distribution and to the complexity in their bioco­ enoses, composed of fresh-water, brackish-water and marine organisms. The decreased measurement of the species current types a supplementary hassle, that is specially stated within the algal groups, a tremendous a part of that are composed of nanno-phytoplankters. The college of Ghent thought of an in depth survey sufficiently appealing to establish as a result excessive species range, the gaps within the wisdom of brackish-water nannophytoplankton on the species and inhabitants degrees, and the handy proximity of brackish-water biotopes. furthermore, the brackish-water biotopes proved to be specified, and encompass a chain of landlocked creeks, con­ nected to the ocean through an underground salt water offer. VII Contents bankruptcy 1 creation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 bankruptcy 2 learn sector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . three 2. 1. Topographical scenario . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . three 2. 2. ancient elements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . four 2. three. Edaphic components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 gains. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 bankruptcy three equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . eleven three. 1. Sampling process. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . eleven three. 2. actual homes, water chemistry, chlorophyll a and phaeophytin a . . . . . . . . . . . . . eleven three. three. Phytoplankton samples. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 three. four. Periphyton and benthos samples. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Sample text

The core of this group is composed of samples 6-11 (April-June). Samples 12, 13 and 14 which are overlapping with these of the summerautumn group are joined to this core. A. (Fig. 43). The variance values for the 1st and 2nd axis are 30 and 13% respectively. A. was applied to the same data matrix (52 taxa, 17 samples) and taxa (Fig. 44) and samples (Fig. 59) were ordinated. 16 respectively. Taxa and samples were classified by cluster analysis (Fig. 45 and Fig. 60 respectively). Based on the combination of these ordinations and classifications four seasonal groups were identified (Table 33).

Lund (1961) found that nanno-phytoplankters are very common in lakes with a low concentration of nutrients. The 6,000 4,000 .... , C. 29,000' c 12,000 ~ ~ Creek 5 Q, 10,000 iii :s Q) o 8,000 ~ :; II) 6,000 DESICCATED 1 F Creek 10 M A M J J 1973 A S 0 N 0 J 1974 F Fig. 34. Monthly variation in surface area of the total phytoplankton in the Grote Geule 0), Rode Geule (2), Kapellenpolderkreek (5) and Boerenkreek (10). 44 6,000 JANUARY 1973 4,000 2,000 . n I~~ In 8 9 10 11 12 13 14 15 16 17 18 19 20 21 Fig.

5 . o E .. ~ .. ~20 Table 18. Summary of 1973-74 ammonia values. 357 max. min. 026 not be considered, because no literature values were available. 8. Nitrite The seasonal variations in nitrite (Fig. 25, Table 19) are well comparable in the Grote Geule (1) and the Boerenkreek (10). Only during winter was a very slight increase in nitrite noticed. The values in other seasons were extremely low. The slightly higher concentration during winter is correlated (Fig. 9, 25) with higher concentrations of nitrate and ammonia and with lower phytoplankton density.

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