ANNEX– Literature review Table S1. Keywords used in search queries. For each query, one item from each column was selected and their unique combination was used. For water level, all effects were included, while for salinity only biological effects were considered. Object Cause Effect (Shallow) lake Water level Macrophytes Reservoir Salinity Phytoplankton Chlorophyll a Zooplankton Fish Nutrients Conductivity pH Oxygen Suspended solids Stratification Mixing regime Table S2: Number of studies on lakes, reservoirs and mesocosms in each climate zone. Climate classes were determined according to the updated Köppen-Geiger classification (Peel et al., 2007; A= tropical; B=arid or desert; C= Temperate; D= cold or continental and E=polar or alpine) Climate class lakes reservoirs experiments All A 6 6 0 12 B 6 2 2 10 C 49 15 6 70 D 23 2 1 26 E 1 0 0 1 Total 85 25 9 119 Table S3: Literature survey using Web of Science and a number of key word combinations. The single impacts cannot fully exclude synergistic or antagonistic effects due to potential multiple stressors (e.g. phytoplankton increase due to water level reduction can be masked by a concomitant increase in nutrient levels due to intensified anthropogenic impacts). Water body Cause shallow Water lake level Effects Phytoplankton increase Change in phytoplankton community reduction Bacterioplankton increase (climate) Change in zooplankton community Zooplankton increase Zooplankton decrease Macrophyte increase References 1,2,3,4,5,6,7 8,9,10,11 1 12 5,13 14 15,16,17,10,11,12,18,19,20, 21,22,23,24 Macrophyte decrease 4,7 Change in macroinvertebrate community 25 Fish increase 12 Fish decrease 19 Fish spawn earlier 26 Oxygen decrease 27 Water transparency decrease Water transparency increase Conductivity increase Salinity increase DIN increase NO3 decrease 2,4,14,28 10 5 23 23,29 20 TP increase 23,29 TP decrease 28 SRP increase 20 TN decrease 28 Internal loading 23,29 Water Phytoplankton decrease 30,31 level Cyanobacteria increase reduction (other) Macrophyte increase level 33,34,30,31,35 Change in macrophyte community 36,37,38 Reed bed increase 37,38,39 Fish reproduction decrease 40 Periphyton increase 45 Oxygen decrease 43 Water transparency increase Water 32 33,34 Conductivity increase 44 TP increase 42 SRP increase 41 TN increase 42 Phytoplankton decrease 46,8,47 Macrophyte increase 46 increase Oxygen increase 27 (climate) SRP decrease 48 Change in phytoplankton community 49 Phytoplankton decrease 49 Water level increase (other) Salinity Change in phytoplankton community increase Change in zooplankton community 50,51 52,53,54,55,56,57,58,59,60, 61,62,63,64,65,66 Zooplankton decrease Zooplankton increase 55,69 Change in macrophyte community 52,70 Change in macroinvertebrate community Macroinvertebrate decrease Change in fish community deep lake 52,56,67,68,60,66,62 52,55,71,61,63,64 71 52,61 Macrobenthos decrease 72 Phytoplankton increase 73 level Macrophyte decrease 74 reduction Water mixing ceasing 75 Water (climate) Water level Phytoplankton increase 76,77 Macrophyte decrease 78 Reed bed increase 78 Macroinvertebrate decrease 78 Fish community change 78 Fish reproduction decrease 79 Nutrients increase 76 DIN decrease 78 Salinity increase 78 Phytoplankton increase 80 Zooplankton decrease 80 increase Fish increase 80 (other) TP decrease 80 NH4 decrease 80 Change in zooplankton composition 81 reduction (other) Water level Salinity increase shallow reservoir Water level Phytoplankton increase 82 Macrophyte decrease 82 reduction (climate) deep Water reservoir level reduction (climate) Phytoplankton increase Change in phytoplankton community 85,77,86 87,84 Macrophyte decrease 88 Change in macrophyte community 89 TP increase 83,84 DIN increase 84 Break up stratification 77 Internal loading 77 Water Phytoplankton increase 90 level Cyanobacteria decrease 91 reduction (other) Change in zooplankton community Macrophyte increase 91,92,93 33 Macrophyte decrease 100 Change in macrophyte community 101 Fish reproduction decrease 96,97,98 Change in fish community 99 Fish pelagic species decrease 99 Macro-invertebrate increase 94 Change in macro-invertebrate community 95 Nutrients increase 95 TP increase 92,102 Chlorophyll a increase 92 Water transparency decrease 92 Water transparency increase 33 Longer stratification 103 Water Phytoplankton increase 104 Change in phytoplankton community 105 Change in zooplankton community 105 level increase (other) Experiment al setup Water level reduction (climate) Macrophyte increase 105,106,107,108 Increase in bacteria, HNF and ciliates 114 Salinity Change in phytoplankton community 111,112 increase Change in zooplankton community 111,113 Zooplankton decrease Change in macrophyte community Macrophyte decrease 1 109 110,111 111 Kisand, V. & T. 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