1. Ecology Habitat Biotic Factors Abiotic Factors Organism---
Living Thing
Organisms obtain food, water,
shelter and other needs to live,
grow and reproduce from its
environment
Different needs----Different Habitats
Habitat
Biotic Factors
Abiotic Factors
Nonliving parts
of Habitat
Living Part of Habitat

2. Abiotic Factors in Habitat
Water---needed for life processes---Photosynthesis and Metabolism
Sunlight---ultimate source of all energy
Oxygen/Carbon Dioxide---needed to carry out life processes
Temperature---cannot live in extremes---some animals alter environments to survive
Soil---mixture of rock fragments, nutrients, air, water and decaying matter

3. Organisms Share their Habitat
Ecology- study of how living things interact with
each other and their environment.
Organisms Share their Habitat
Live in Populations--- members of one
species in a particular area
Communities--- all different populations
that live and interact together
Ecosystems---organisms that live in a
particular area along with
their nonliving (abiotic)
surroundings

4. Studying Populations Determining Population Size Direct Observation
Define Population---
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Determining Population Size
Method Description
Direct Observation
Count all members of a population
Indirect Observation
Observe evidence of or signs of organisms
Estimate—approximate number
Count population in a small area/multiply to find
Number in large area
Sampling
Catch without harming---count---mark
By some method---release---return and
Recapture—count those with and without
Markings—use formula to estimate pop
Mark and
Recapture
What causes changes in populations?
Births---Deaths Immigration---Emigration
How do you calculate population density?
What is a limiting factor?
Name some.
into
out
Population = Number Individuals students
Density Unit of Area classrooms
30 students per class
Something that causes a population to decrease
Food, water, temperature, rainfall, space