Ecology Essay

1408 WordsFeb 1, 20156 Pages
Ecology Unit Ecology: the study of how living and non-living things interact with their surroundings Fundamental Concept: All living things are interdependent and they interact with each other and the environment Interactions result in a flow of energy and material cycling Environment = every living and non-living thing that surrounds an organism Biosphere = all locations in, on, and above earth where life exists; biologically inhabited part of the planet [pic] Ecosystem = any portion of the environment Abiotic factors – non-living things (or influences) *Soil, water, physical space, energy, temperature, rainfall activity, light Biotic factors – living things affecting others (ex. predation; competition) *Relationships between organisms include: Predator/Prey relationships Parasite/Host Disease causer – pathogen Producer/Consumer Scavengers Decomposers Environmental Limits on Population Size The growth and survival of organisms depends on physical conditions and the resources available to an organism [pic] Competition = the struggle among organisms for resources Competition keeps the population size in check -Over time the population size remains the same -Many populations vary with seasons; populations increase or decrease depending on resources that are available at the time Interdependence often results in approximate stability over 100’s – 1000’s of years. As one population increases it’s held in check by one or more environmental factors or another species. Some relationships between organisms are beneficial to some Ex. Symbiotic relationships including mutualism & commensalism Limiting factors [pic] Those essential living (biotic) and non-living (abiotic) factors that a population runs

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