Warm Up 10 4/7 ______ is the day to day condition. 2. ________ is the average, year after year condition. List the 3 main gases of the greenhouse effect that trap in heat to keep Earth warm. What are the 3 main climate zones? Which one are we in? Heat is transported in the biosphere by ______ & ______ currents.

4.2 What Shapes an Ecosystem

Biotic factor: biological influence on organisms within an ecosystem Ex: predators, competition, bacteria, trees, plants

Abiotic factor: nonliving factor that shapes an ecosystem Ex: Soil type, rainfall, temperature, sunlight, winds, cave, nutrient availability

Abiotic or Biotic factor?

Habitat: area where an organism lives (includes abiotic & biotic factors)

Niche: full range of physical & biological conditions in which an organisms lives & the way they use those conditions (occupation) Ex: 3 types of warblers have own niche in tree food, how it obtains, how it reproduces, where it needs to live

Resource: any necessity of life Ex: Water, nutrients, light, food, or space Competition: organisms of same or different species attempt to use same resource at same time

Competitive exclusion principle: no 2 species can occupy the same niche in the same habitat at the same time

Predation: one organism captures & feeds on another organism Ex: snake eats frog

Any necessity of life (water, shelter, mates)

nonliving factor that shapes an ecosystem Ex: Soil type, rainfall

Where an organism lives

biological influence on organisms within an ecosystem Ex: predators, competition, bacteria,

full range of physical & biological conditions in which an organisms lives & the way they use those conditions (occupation)

one organism captures & feeds on another organism

no 2 species can occupy the same niche in the same habitat at the same time

organisms of same or different species attempt to use same resource at same time

Symbiosis any relationship in which two species live closely together “living together”

Mutualism (+/+) both species benefit from the relationship

Commensalism (+/0) one member of the association benefits and the other is neither helped nor harmed

Parasitism (+/-) one organism lives on or inside another organism and harms it