Preface ...................................................... 1-2
CLIMATE CHANGE AND ANTHROPOGENIC IMPACTS ON LARGE LAKES
ECOSYSTEMS
Nutrients and phytoplankton in Lake Peipsi during two
periods that differed in water level and temperature
M. Haldna, A. Milius, R. Laugaste, K. Kangur .............. 3-11
Pollen, diatom and plant macrofossil assemblages indicate
a low water level phase of Lake Peipsi at the beginning
of the Holocene
T. Hang, V. Kalm, K. Kihno, M. Milkevicius ............... 13-21
Water level changes in a large shallow lake as reflected
by the plankton:periphyton-ratio of sedimentary diatoms
A. Heinsalu, H. Luup, T. Alliksaar, P. Noges, T. Noges ... 23-30
Changes in spatial distribution of phosphorus and
nitrogen in the large north-temperate lowland Lake
Peipsi (Estonia/Russia)
K. Kangur, T. Mols ....................................... 31-39
Recent trends in Lake Ladoga ice cover
S.G. Karetnlkov, M.A. Naumenko ........................... 41-48
History of anthropogenically mediated eutrophication of
Lake Peipsi as revealed by the stratigraphy of fossil
pigments and molecular size fractions of pore-water
dissolved organic matter
A. Leeben, I. Tonno, R. Freiberg, V. Lepane, N.
Bonningues, N. Makarotseva, A. Heinsalu, T. Alliksaar .... 49-58
Seasonality and trends in the Secchi disk transparency of
Lake Ladoga
M.A. Naumenko ............................................ 59-65
Silicon load and the development of diatoms in three
river-lake systems in countries surrounding the Baltic
Sea
P. Noges, T. Noges, R. Adrian, G.A. Weyhenmeyer .......... 67-76
Critical N:P ratio for cyanobacteria and N2-fixing
species in the large shallow temperate lakes Peipsi
and Vortsjarv, North-East Europe
T. Noges, R. Laugaste, P. Noges, I. Tonno ................ 77-86
Phytoplankton nitrogen demand and the significance of
internal and external nitrogen sources in a large shallow
lake (Lake Balaton, Hungary)
M. Presing, T. Preston, A. Takatsy, P. Spröber,
A.W. Kovacs, L. Vörös, G. Kenesi, I. Kobor ............... 87-95
Changes in the water level of Lake Peipsi and their
reflection in a sediment core
J.-M. Punning, G. Kapanen, T. Hang, N. Davydova,
M. Kangur ............................................... 97-104
Rates of change in physical and chemical lake variables
- are they comparable between large and small lakes?
G.A. Weyhenmeyer ....................................... 105-110
Increasingly ice-free winters and their effects on
water quality in Sweden's largest lakes
G.A. Weyhenmeyer, A.-K. Westöö, E. Willen .............. 111-118
Phosphorus fractions and alkaline phosphatase activity
in sediments of a large eutrophic Chinese lake
(Lake Taihu)
Y. Zhou, C. Song, X. Cao, J. Li, G. Chen, Z. Xia,
P. Jiang ............................................... 119-125
FOOD WEB INTERACTIONS AND DYNAMICS IN LARGE LAKES
The impact of the invasive Ponto-Caspian amphipod
Pontogammarus robustoides on littoral communities
in Lithuanian lakes
S. Gumuliauskaite, K. Arbaciauskas ..................... 127-134
Spatiotemporal and long-term variation in phytoplankton
communities in the oligotrophic Lake Pyhäjärvi on the
Finnish-Russian border
A.-L. Holopainen, L. Lepistö, R. Niinioja, A. Rämö ..... 135-141
Plant-associated invertebrates and hydrological balance
in the large volcanic Lake Bracciano (Central Italy)
during two years with different water levels
L. Mastrantuono, A.G. Solimini, P. Noges,
M. Bazzanti ............................................ 143-152
A comparison of zooplankton densities and biomass in
Lakes Peipsi and Vortsjarv (Estonia): rotifers and
crustaceans versus ciliates
P. Zingel, J. Haberman ................................. 153-159
MODELING TOOLS IN LARGE LAKES RESEARCH
Validation of the MERIS products on large European
lakes: Peipsi, Vanern and Vattern
K. Alikas, A. Reinart .................................. 161-168
Relations of phytoplankton in situ primary production,
chlorophyll concentration and underwater irradiance in
turbid lakes
H. Arst, T. Noges, P. Noges, B. Paavel ................. 169-176
Models as tools for understanding past, recent and
future changes in large lakes
T. Blenckner ........................................... 177-182
The ice cover on small and large lakes: scaling
analysis and mathematical modelling
M. Lepparänta, K. Wang ................................. 183-189
Effects of warmer world scenarios on hydrologic inputs
to Lake Malaren, Sweden and implications for nutrient
loads
K. Moore, D. Pierson, K. Pettersson, E. Schneiderman,
P. Samuelsson .......................................... 191-199
Variability of bio-optical parameters in two North-
European large lakes
B. Paavel, H. Arst, A. Reinart ......................... 201-211
Contributions of DOC from surface and groundflow into
Lake Vortsjarv (Estonia)
T. Tamm, T. Noges, A. Järvet, F. Bouraoui .............. 213-220
WATER POLICY AND SOCIOECONOMIC ASPECTS OF LARGE LAKE
MANAGEMENT
Implications of flexibility in European Community
environmental law: exemptions from environmental
objectives in the Water Framework Directive
E. Grönlund, T. Määttä ................................. 221-226
Analysis of long-term ecological status of Lake Balaton
based on the ALMOBAL phytoplankton database
Ё. Hajnal, J. Padisak .................................. 227-237
Towards ecofogical goals for the heavily modified lakes
in the IJsselmeer area, The Netherlands
E. Lammens, F. van Luijn, Y. Wessels, H. Bouwhuis,
R. Noordhuis, R. Portielje, D. van der Molen ........... 239-247
Environmental awareness of the permanent inhabitants
of towns and villages on the shores of Lake Balaton
with special reference to issues related to global
climate change
A. Varkuti, K. Kovacs, C. Stenger-Kovacs, J. Padisak ... 249-257
Highlights of large lake research and management in
Europe
P. Noges, K. Kangur, T. Noges, A. Reinart, H. Simola,
M. Viljanen ............................................ 259-276
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