- 期刊
Temporal and Spatial Variation in the Zooplankton: Phytoplankton Biomass Ratio in a Large Shallow Lake
並列摘要
The material of the present study was collected from the pelagial of L. Peipsi (Estonia/Russia) mainly during the vegetation periods of 1997-2008. The zooplankton: phytoplankton biomass ratio (B(subscript Zp)/B(subscript Phyt)) was followed in different lake parts: the northern eutrophic L. Peipsi s.s. and the southern hypertrophic L. Pihkva (together with L. Lämmijärv connecting the other parts). During 1997-2008 the average values of B(subscript Zp)/B(subscript Phyt) for the growing season were lower than 0.5 (0.27 and 0.16 for L. Peipsi s.s. and L. Lämmijärv, respectively). The average monthly values of B(subscript Zp)/B(subscript Phyt) fluctuated in a wide range: from 0.06 to 0.62 for L. Peipsi s.s. and from 0.06 to 0.29 for L. Lämmijärv in May-October. For L. Pihkva, this value was 0.06 in August. Maximum values (up to 2) occurred for L. Peipsi s.s. in June and quite a high value (up to 1) was also found in May. In parallel with the increasing trophic state of the lake, the mean values of B(subscript Zp)/B(subscript Phyt) for the growing season decreased from 0.34 in 1997 to 0.18 in 2008 in L. Peipsi s.s., and from 0.24 to 0.10 in L. Lämmijärv. The widest range of fluctuations in B(subscript Zp)/B(subscript Phyt) was found in May and August. For May this is explicable with differences in the melting time of the ice cover and therefore, in the timing of the spring peak of phytoplankton in different years. In August the absolute values of phytoplankton (water bloom caused by cyanobacteria) varied by years and depended mainly on weather conditions. The ratio demonstrated lowest variability in autumn months. This ratio revealed significant differences in the content of nutrients and characteristic features in plankton between the lake parts with different levels of trophy (P-level＜0.0001). We consider mean values of the ratio B(subscript Zp)/B(subscript Phyt) in a growing season to be quite a reliable indicator for assessing the quality of the ecosystem and water of a large lake.
延伸閱讀
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