Related by context. Frequent words. (Click for all words.) 55 terrestrial ecosystems 53 otolith 52 phytoplankton blooms 52 trophic 52 hydrologic cycle 51 insect populations 51 planktonic 50 nitrogen fixation 50 hydrological cycle 50 plankton blooms 50 bioaccumulation 50 atmospheric methane 49 tropospheric 49 atmospheric CO 48 sexual dimorphism 48 deglaciation 48 overharvest 48 snowshoe hares 48 infectious prions 48 temperate regions 48 perturbation 48 diatom 48 variability 48 species extinctions 47 upwellings 47 biogeochemical 47 predator prey 47 predation 47 ocean acidity 47 habituation 47 genetic variability 47 oscillations 47 asexual reproduction 47 anaplasmosis 47 temperate zones 47 oscillatory 46 Pacific Decadal Oscillation 46 reproductive hormones 46 phenology 46 drier summers 46 crocodilians 46 multicellular organisms 46 salinity 46 marine invertebrates 46 corticosterone 46 atmospheric circulation 46 conductance 46 CO2 concentrations 46 biota 46 poleward 46 solar irradiance 46 sunspot activity 46 glacial melting 46 spermatogenesis 46 glacial melt 46 bird migrations 46 Dry Valleys 45 amphibian populations 45 decoherence 45 mammals 45 thermoregulation 45 speciation 45 Migrating birds 45 marine sediments 45 organisms 45 soybean aphid 45 isotope ratios 45 faunal 45 species 45 Greater Yellowstone Ecosystem 45 clathrates 45 anthropogenic 45 otoliths 45 ocean salinity 45 habitat fragmentation 45 avian species 45 equatorial Pacific 44 Bt crops 44 climatic conditions 44 nutrient loading 44 geomagnetic 44 temperature gradient 44 streamflows 44 evolutionary adaptation 44 severe droughts 44 SSTs 44 Cyanobacteria 44 aquatic invertebrates 44 zooplankton 44 intertidal zone 44 anoxia 44 fluctuations 44 geomagnetic field 44 perturbations 44 prolonged droughts 44 abundances 44 glaciations 44 metastable 44 reproduce asexually 44 atmospheric CO2 44 isotopic composition