ecosystems and communities for blog
TRANSCRIPT
Ecosystems and
Communities
Climate vs. Weather
• Weather – day to day conditions in a particular place at a particular time.
• Climate – avg. of temperature and precipitation in a region from year to year.
Greenhouse Effect
• Where heat is retained in the earths atmosphere by greenhouse gases (CO2)
Global Warming
• Term used to describe an increase in the average temperature of the biosphere
• Cause is believed to be human activities
What shapes an Ecosystem?
• Biotic factors – living parts of an ecosystem
• Abiotic factors – nonliving parts of an ecosystem
What shapes an Ecosystem con’t
• Habitat – where an organism lives.
• Niche – an organisms purpose (includes food, space, reproduction, & how it interacts with other organisms)
Community Interactions
• Competition – occurs when members of the same or different species attempt to use resources in the same place at the same time.
Community Interactions
• Predation Predator
organism that kills (hunts)
• Prey organism that is
the food– Ex. Cat and
mouse
Community Interactions
• Symbiosis – 2 species living closely together– Mutualism
both species benefit •Ex. Flower & insect
Community Interactions
– Commensalism when one member benefits while the other is neither helped nor harmed.•Ex barnacles on whales skin
– Parasitism when one organism lives on or inside another organism and harms it.•Ex. Flea, tick