7-Systems and Ecosystems post

7-Systems and Ecosystems post - Ecology &...

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Ecology & Environmental Problems Biology 1305 Systems and Ecosytems The Earths systems System = a network of relationships among parts elements or components that interact with and influence one another Exchange of energy, matter, or information Receives inputs of energy, matter, or information; processes these inputs; and produces outputs Systems often show behavior that is hard to understand and predict Feedback loop = a systems output serves as input to that same system A circular process Negative feedback loop Negative feedback loop = output that results from a system moving in one direction acts as input that moves the system in the other direction. - Input and output essentially neutralize one another Stabilizes the system Example: body temperature Most systems in nature Positive feedback loop Positive feedback loop = instead of stabilizing a system, it drives it further toward one extreme or another Examples: exponential growth in human population, spread of cancer, erosion Rare in nature But are common in natural systems altered by human impact Systems are active Dynamic equilibrium = system processes move in opposing directions at equivalent rates, balancing their effects Homeostasis = a system maintains constant or stable internal conditions Emergent properties = system characteristics not evident in the components alone The whole is more than the sum of the parts It is hard to fully understand systems; they connect to other systems and do not have sharp boundaries Environmental entities are complex systems that interact with each other For example, river systems consist of hundreds of smaller tributary subsystems To solve environmental problems, all appropriate systems must be considered Categorizing environmental systems helps make Earths dazzling complexity comprehensible For example, the earth consists of structural spheres Lithosphere = rock and sediment Atmosphere = the air Hydrosphere = liquid, solid or vapor water Biosphere = all the planets living organisms and the abiotic portions of the environment Boundaries overlap, so the systems interact The Gulf of Mexico from a systems perspective Nutrients from fertilizer enter the Mississippi River from Midwestern farms Fertilizer use has increased, which causes....
View Full Document

Page1 / 47

7-Systems and Ecosystems post - Ecology &...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online