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Interrelations with Other Organisms
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abundance adaptations adult algae animals average biological control biomass birds breeding changes chemical climatic climax community colonization community ecology competition constant Copyright crop curve death rate desert desert locust determine Discuss dispersal distribution dominant ecologists ecology ecosystem effects energy environment environmental equation equilibrium estimate evolutionary example extinction factors feeding fertility fish fishery forest genetic gradient grass grassland grazing grouse habitat herbivores hypothesis illustrate important individuals insect interactions island Lake leaf limits locust logistic logistic curve measured moisture mortality natural niche nitrogen North America number of species occur organisms parasites percent pest phosphorus photosynthesis phytoplankton pine plankton plants population density population growth predators prey primary production problem range red grouse Reprinted with permission respiration salmon sample season seedlings seeds selection shows soil species diversity stability studied succession survival Table temperature timberline tion trees trophic level tropical tundra vegetation zone zooplankton