Conference Proceedings - IAD

39th IAD Conference, August 2012, Szentendre, Hungary
marsh samples in the Orsoya Marshland (OTO), positioned in the middle bottom
of the diagram, influenced mainly by the transparency and the oxygen
concentration. An extreme development and extinction of macrophytes in the
peat-marsh were observed annually. The third group, formed by the channels
and the fishponds in the Orsoya Marshland, is located from the center along the
axis of the temperature and the water level fluctuation. The channel system (OK)
and (ORI) are the most decreased water level stations. This has caused
shallowness of the channel system and higher temperature fluctuations.
Figure 6. Correspondence between environmental parameters and zooplankton
community structure. P-value = 0.009
The significance of environmental parameters on the different habitats of
macrozoobenthos communities were analyzed (Fig.7). The first two axis explain
48.77 of the total variation with eigenvalues 0.526 for the first and 0.455 for the
second axis respectively. The diagram (Fig. 7) showed that dissolved oxygen
and oxygen saturation are the most significant factors that have influenced the
communities in the habitats peat-marsh (OTO) and fishponds (ORI) of the
Orsoya Marshland, just as like as for the littoral (MPO) and profundal (MPS)
zones of Malak Preslavets. The oxygen values were influenced by the growth of
the submerged vegetation, which was limited by the depth of the wetland. The
sampling points from the channels (OK) showed correlation with the vectors
depth, water temperature and conductivity. In the shallower sampling points of
Malak Preslavets (MPO) the significant factors were dissolved oxygen, water
temperature and conductivity. The samples (OK1030) and (MPS061) were
gathered from the deepest points in each wetland, revealing the depth as
significant factor here. While dissolved oxygen and saturation correlated as a
main factor that determines the highest species richness of the
macrozoobenthos.
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