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Lake responses to reduced nutrient loading - an analysis of contemporary long-term data from 35 case studies
30 auth. E. Jeppesen, M. Søndergaard, J. P. Jensen, K. Havens, O. Anneville, L. Carvalho, M. Coveney, R. Deneke, M. Dokulil, B. Foy, D. Gerdeaux, S. Hampton, S. Hilt, K. Kangur, J. Köhler, ...
SUMMARY 1. This synthesis examines 35 long-term (5–35 years, mean: 16 years) lake re-oligotrophication studies. It covers lakes ranging from shallow (mean depth <5 m and/or polymictic) to deep (mean depth up to 177 m), oligotrophic to hypertrophic (…
SUMMARY 1. This synthesis examines 35 long-term (5–35 years, mean: 16 years) lake re-oligotrophication studies. It covers lakes ranging from shallow (mean depth <5 m and/or polymictic) to deep (mean depth up to 177 m), oligotrophic to hypertrophic (summer mean total phosphorus concentration from 7.5 to 3500 l gL )1 before loading reduction), subtropical to temperate (latitude: 28–65� ), and lowland to upland (altitude: 0–481 m). Shallow northtemperate lakes were most abundant. 2. Reduction of external total phosphorus (TP) loading resulted in lower in-lake TP concentration, lower chlorophyll a (chl a) concentration and higher Secchi depth in most lakes. Internal loading delayed the recovery, but in most lakes a new equilibrium for TP
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29
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10 | 2005 |
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