Date post: | 14-Jan-2016 |
Category: |
Documents |
Upload: | primrose-tamsin-white |
View: | 214 times |
Download: | 1 times |
What shapes an ecosystem?4-1, 4-2 A
Greenhouse effect
• CO2, methane, water vapor trap heat energy
• Maintains Earth’s temp range
• Solar E is trapped, heat E doesn’t escape into space
Latitude effects
• Cause: Angle of sun’s heating and tilt of the earth • Effect: Earth has 3 major climate zones
PolarTemperateTropical
Heat transport
Habitat = address
• Biotic factors:
All other living things in the community
• Abiotic factors: climate, temp, rainfall, nutrients, sunlight
• Both determine survival and growth of organisms
Niche = job • What it eats• Place in the food
web• Physical conditions
it needs to survive• How it reproduces
Competition
• No two species can share the same niche in the same habitat.
• Ex: 3 types of warbler share the same tree, but feed at different places to decrease their competition
Bay-Breasted WarblerFeeds in the middlepart of the tree
Yellow-Rumped WarblerFeeds in the lower part of the tree andat the bases of the middle branches
Cape May WarblerFeeds at the tips of branchesnear the top of the tree
Spruce tree
Section 4-2
Figure 4-5 Three Species of Warblers and Their Niches
Succession• A series of
predictable changes to an ecosystem, in response to natural or human disturbances
• Primary: begins where no soil exists
• Secondary: change after a disturbance like fire or farming
Succession at Mt. St. Helens following a volcanic eruption
Succession: from pioneer species to climax forest
Lichens, moss create soil for succeeding plant species
Marine succession
• A whale dies and sinks to the ocean floor
• Fishes will eat the meat
• Amphipods, worms, bacteria complete the process of releasing nutrients back into the ecosystem