Titlebook: European Large Lakes; Ecosystem changes an Tiina Nõges,Reiner Eckmann,Markku Viljanen Book 2008 Springer Science+Business Media B.V. 2008 E

HIKE

mettlesome

值得尊敬

思乡病

History of anthropogenically mediated eutrophication of Lake Peipsi as revealed by the stratigraphy o increase around the end of the 1930s. We conclude that this rise was generated by a coincidence of several anthropogenic and natural factors. The pore-water data also show that a slight relative reduction in the autochthonous organic matter took place in the 1990s. A discordance in the paleodata o

有限

Seasonality and trends in the Secchi disk transparency of Lake Ladogas. Both the minimum mean value of water transparency and minimum horizontal gradients of .. for the lake occur in August. The regions with significant interannual (climatic) decreasing trends of .. have been identified. These areas increase in summertime and cover approximately half the lake area. I

output

Silicon load and the development of diatoms in three river-lake systems in countries surrounding therent patterns among the river systems. We found significant season-specific correlations of the NAOw with either the biomass or the share of diatoms in each lake, but no coherent pattern among the lakes. Our results indicate that processes driven by water discharge are more coherent across regions t

礼节

Critical N:P ratio for cyanobacteria and N2-fixing species in the large shallow temperate lakes Peip at or below 20 for both TN:TP and Nmin:SRP. In Võrtsjärv, the TN:TP supporting a high Nfix% was between 30 and 40 and the N.:SRP supporting this high percentage was in the same range as that in Peipsi (<20), though the maximum Nfix% values in Võrtsjärv (69%) were much lower than in Peipsi (96%). Th

设施

Phytoplankton nitrogen demand and the significance of internal and external nitrogen sources in a lareased slowly in the spring (0.38 and 0.45 µg N cm. day.) and peaked in late summer (0.82 and 1.29 µg N cm. day., respectively). Ammonium uptake was predominant in spring in the Eastern basin and in summer in the Western basin, coincident with the cyanobacterial bloom. The amount of N. fixed was les

裤子

Changes in the water level of Lake Peipsi and their reflection in a sediment coreer depth and area of the lake increased, wave-induced erosion and resedimentation smoothed or even disturbed the initial information. The increase of phosphorus content in the unconsolidated, high-porosity surface sediments (0.5 m) is most probably connected with active diffusion and matter exchange

围裙