Download Populations in Ecosystems

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