Related by context. Frequent words. (Click for all words.) 64 aquatic ecosystems 62 organisms 61 species 60 aquatic species 60 marine ecosystems 60 ecosystems 59 aquatic organisms 58 biosphere 57 invertebrates 57 fauna 56 marine ecosystem 56 diatoms 56 zooplankton 56 sediments 56 microorganisms 56 ocean ecosystems 55 mammals 54 microbes 54 forest ecosystems 54 freshwater 54 microscopic organisms 53 marine organisms 53 coastal ecosystems 53 biodiversity 53 coral reefs 52 amphibians 52 micro organisms 52 coral species 52 microbial 52 flora 52 sediment 52 acidification 52 cyanobacteria 51 alga 51 microorganism 51 plankton 51 ecology 51 flora fauna 50 boreal forests 50 organism 50 lakes 50 soils 50 habitats 50 contaminants 50 lichens 50 taxa 50 landforms 50 wetlands 49 reefs 49 boreal 49 watersheds 49 birdlife 49 salinity 49 Invasive species 49 frog species 49 habitat 49 freshwater lakes 49 aquatic insects 49 phytoplankton 48 marine ecology 48 vertebrate 48 wetland habitat 48 estuarine 48 ecological 48 mountain glaciers 48 bird species 48 marine biodiversity 48 invasive species 48 vertebrates 48 fungi 48 pathogens 48 bacteria 48 amphibian species 48 aquatic habitat 48 karst 48 wetland 48 dissolved oxygen 48 herbivores 48 corals 48 ecosystem 48 anthropogenic 47 estuaries 47 dugongs 47 Zebra mussels 47 geological formations 47 glaciers 47 sedimentation 47 biodiverse 47 sediment samples 47 sedimentary rocks 47 oceans 47 aquatic 46 intestinal bacteria 46 eutrophication 46 bacterial 46 vegetation 46 mammal 46 arthropods 46 methyl mercury 46 sulfides 46 fragile ecosystem