Related by context. Frequent words. (Click for all words.) 51 bark beetle 51 outbreaks 50 insect infestations 50 El Niños 50 prolonged droughts 49 Volcanic eruptions 48 beetle infestation 48 dieback 48 influenza epidemics 48 temperate zones 47 winterkill 47 forest fires 47 veld fires 47 bark beetles 47 epidemics 47 Pandemics 46 Droughts 46 Infestations 46 insect populations 46 forbs 46 Tularemia 46 pine beetle epidemic 46 Salmonellosis 45 species extinctions 45 mountain pine beetles 45 bark beetle infestation 45 canine distemper 45 honey bee colonies 45 avian flu outbreaks 45 Algae blooms 44 Sudden Oak 44 overhunting 44 defoliation 44 prolonged drought 44 infestations 44 anaplasmosis 44 Hantavirus 44 Outbreaks 44 temperate regions 44 terrestrial ecosystems 44 Genital herpes 44 overgrazing 43 Distemper 43 Feral hogs 43 spider bites 43 cholera epidemics 43 bee populations 43 warmer winters 43 hydrological cycle 43 sicknesses 43 droughts 43 snow melt 43 insect borne diseases 43 harmattan 43 Cambrian explosion 43 mountain lion sightings 43 peat fires 43 wildfires 43 White Nose Syndrome 43 amphibian populations 43 pneumonias 43 habitat degradation 43 avian influenza viruses 43 recur 43 toxic algae blooms 42 snowmelt 42 psychogenic 42 honeybee population 42 harvested acreage 42 hatchings 42 accidental poisonings 42 armyworms 42 glacial melting 42 lodgepole 42 coral bleaching 42 Viral meningitis 42 Allergic reactions 42 St. Louis encephalitis 42 inundations 42 occurences 42 causes chickenpox 42 aspen trees 42 habitat fragmentation 42 hotter summers 42 saturated soils 42 iatrogenic 42 Spanish flu pandemic 42 chytrid fungus 42 salmonella infection 41 parasitic infection 41 mass extinctions 41 influenza pandemics 41 zoonotic diseases 41 infects humans 41 mosquito populations 41 mild winters 41 cheatgrass 41 Salmonella Typhimurium 41 El Nino phenomenon 41 pine beetle infestation 41 WNV infection