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Populations in Ecosystems Carrying capacity – the maximum # of individuals a species can produce with environmental resistance - Biotic and Abiotic Biotic potential – Maximum # of individuals a species can produce without environmental resistance, i.e. fish fill the universe? No predation unlimited resources no disease, etc. Limiting factors: Density independent factors – Abiotic factors, effect each individual member of a population regardless of #’s present, i.e. forest fire, drought, flood. Density dependent factors – Biotic factors that effect population size as a result of the #’s in the population, i.e. disease, competition, predation Growth Curves Exponential growth Logistic growth Linear growth POPULATION SIZE TIME -Period of rapid growth -Includes lag phase, growth phase, and stabilization -Shows carrying capacity -Steady growth Biotic relationships Predation – organism that eats another organism Scavenger – organism that eats dead organism Competition – Interaction between two organisms for a limited resource Parasitism – Relationship between two organisms where 1 is harmed and one benefits Mutualism – 2 organisms live together cooperatively – they both benefit form the interaction Commensalism – 1 organisms benefits and the other organism neither benefits or is harmed LOGISTIC GROWTH
