Presentation on theme: "Community Interactions"— Presentation transcript:
1 Community Interactions Ecology Notes 4-2Community Interactions
2 Biotic vs. AbioticBiotic factors – living factors in an environment. Ex. Trees, birds, bacteria, etc.Abiotic factors – non living factors in an environment. Ex. Temp., rainfall, humidity, soil.
3 NicheNiche – full range of conditions in which an organism lives (biotic and abiotic). It is like your “occupation”.
4 CompetitionCompetition – occurs when organisms attempt to use a resource (water, nutrients, light, food or space) at the same time.We call this a +/- relationship.Competitive Exclusion Principle – no two organisms can occupy exactly the same niche in the same habitat at the same time.
5 Predation One organism captures and feeds on another organism. This is a +/- relationship.
6 Symbiosis – any relationship where two organisms live closely together. 3 types of Symbiosis1. Mutualism +/+ both organisms benefit. Ex. Flowers/insects.
7 2. Commensalism +/0 one organism benefits and the other is neither helped nor harmed. Ex. Whales/barnacles
8 3. Parasitism +/- One organism lives on or in another organism. Ex 3. Parasitism +/- One organism lives on or in another organism. Ex. Dog/flea