Related by context. Frequent words. (Click for all words.) 73 ecosystems 70 marine ecosystems 65 marine ecosystem 63 aquatic species 63 habitats 61 biodiversity 61 watersheds 60 wildlife habitats 60 wildlife habitat 59 waterways 59 freshwater 58 estuaries 58 lakes 57 ecology 57 algae blooms 57 wetlands 56 ecosystem 56 coral reefs 56 habitat 56 algal blooms 55 biosphere 55 flora 54 species 54 ecological 54 oceans 54 acidification 54 plankton 53 fauna 53 zooplankton 53 aquatic 53 invasive species 53 wetland 53 reefs 53 sedimentation 53 salinity 53 bio diversity 53 marine organisms 52 organisms 52 fisheries 52 vegetation 52 phytoplankton 52 soils 52 sediment 51 invertebrates 51 fragile ecosystem 51 estuary 51 corals 50 wildlife 50 Wetlands 50 cyanobacteria 50 toxic algae 50 pollinators 50 rivers 49 lichens 49 algae 49 soil fertility 49 amphibians 49 nutrient 49 shorelines 49 salt marshes 49 ocean acidification 49 sediments 49 nutrients 49 rivers lakes 48 soil erosion 48 lake 48 ecologically 48 zebra mussels 48 microorganisms 48 riparian 48 carbon sinks 47 lakes rivers 47 atmospheric carbon dioxide 47 seagrass 47 fishery 47 boreal forest 47 microbial 47 dissolved oxygen 47 coral reef 47 mangrove forests 47 tributaries 46 micro organisms 46 microbes 46 cutthroat trout 46 mussels 46 pollutants 46 inland lakes 46 grasslands 46 shellfish beds 46 mangroves 46 siltation 46 biodiversity conservation 46 ponds 46 glaciers 45 rangelands 45 aquifers 45 groundwater 45 toxic pollutants 45 Biodiversity 45 river basins 45 Wetland