Related by context. Frequent words. (Click for all words.) 58 nitrogen deposition 58 subglacial 57 phytoplankton blooms 56 ecoregions 56 freshwater habitats 56 biogeochemical 56 deplete oxygen 55 Algae blooms 55 Coral bleaching 54 Melting glaciers 54 Schladow 54 terrestrial ecosystems 54 upwellings 54 river catchments 54 bioaccumulation 53 hydrological cycle 53 Methylmercury 53 lakes 53 plankton blooms 53 Polar Regions 53 nitrate concentrations 53 salinization 52 Cyanobacteria 52 atmospheric methane 52 receding glaciers 52 harmful algal blooms 52 freshwater lakes 52 toxic algae blooms 52 Norris Geyser Basin 52 wetland ecosystem 52 hydrologic cycle 52 shortnose sturgeon 52 biodiversity hotspot 52 algal bloom 51 refugia 51 hydrothermal activity 51 freshwater 51 permafrost thaws 51 El Nino Southern Oscillation 51 glacial melt 51 tributary rivers 51 severe droughts 51 marine sediments 51 organochlorines 51 migratory bird populations 51 endocrine disruption 51 temperate forests 51 freshwaters 51 creeks rivers 51 atmospheric ozone 51 headwater 51 Didymo 50 sediment sampling 50 tidewater glaciers 50 aquatic ecosystems 50 river deltas 50 biota 50 clathrates 50 Qinghai Tibet plateau 50 tributary streams 50 wetter winters 50 methane CH4 50 aquatic invertebrates 50 nutrient loading 50 mountain snowpacks 50 Dry Valleys 50 microcystin 50 Poyang Lake 50 snow melt 49 harmful algae blooms 49 glacial retreat 49 salination 49 species extinctions 49 wetland ecosystems 49 biodiversity hotspots 49 intersex fish 49 melting snowpack 49 cryosphere 49 amphipods 49 Lake Vostok 49 icecaps 49 Sulphur dioxide 49 streambanks 49 acidify 49 inorganic mercury 49 subarctic 49 retreating glaciers 49 groundwater aquifers 49 creeks streams 49 montane 49 Turbidity 49 groundwater depletion 49 warmer wetter 49 freshwater mussels 49 phosphorus runoff 49 aquatic habitats 49 dump raw sewage 49 temperate rainforest 49 aquatic ecosystem 48 deglaciation 48 ponded