Related by context. Frequent words. (Click for all words.) 60 subarctic 58 Seafloor 58 terrestrial ecosystems 57 Polar Regions 56 refugia 56 plankton blooms 55 bioregion 55 hydrologic cycle 55 Subtropical 54 Svalbard archipelago 54 planktonic 54 deglaciation 54 subglacial 53 temperate rainforest 53 Melting glaciers 53 Diatoms 53 deplete oxygen 53 Weddell Sea 53 Cyanobacteria 53 amphipods 53 Equatorial Pacific 52 NASA MODIS Image 52 intertidal zone 52 Arctic permafrost 52 equatorial waters 52 Arctic 52 marine sediments 51 biogeochemical 51 coniferous forests 51 Biogeography 51 admiral asks 51 subtropical regions 51 freshwater habitats 51 Geochemistry 51 upwellings 50 gyres 50 Antartic 50 Coral reef 50 Biogeochemistry 50 phytoplankton blooms 50 Phytoplankton 50 Spiny 50 nitrification 50 biodiversity hotspot 50 Foraging 50 volcanic lava 50 abyssal 50 Quaternary 50 Methylmercury 50 humid climates 50 hydrological cycle 50 Australian aborigines 50 Ice Ages 49 Hydrothermal 49 Permafrost 49 Extinctions 49 atmospheric pollutants 49 methane CH4 49 Neoproterozoic 49 Coral bleaching 49 Salamanders 49 temperate zones 49 wetland ecosystems 49 Coral Reefs 49 faunal 49 aquatic habitats 49 Temperate 49 atmospheric ozone 49 Microorganisms 49 isotope ratios 49 Wadden Sea 48 montane 48 boreal forests 48 Sea otters 48 Holocene 48 hydrothermal vent 48 intertidal 48 loess 48 temperature gradients 48 evergreen forests 48 Algal 48 macroinvertebrates 48 Fiord 48 bioaccumulation 48 volcanic vents 48 seals sea lions 48 diatom 48 freshwater ecosystems 48 benthic 48 Salinity 48 Sediments 48 Seward Peninsula 48 relict 48 cryosphere 48 Acidity 48 Lake Vostok 48 Dry Valleys 48 biota 48 Oscillation 48 acidify 47 tidewater glaciers