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Ecology
Flashcards for the course "Ecololgy and Society"
23
Environmental Studies
Undergraduate 2
01/20/2010

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Cards

Term
Ecology
Definition
The study of relationships between organisms and the environment.
Term
Evolution
Definition
The process by which populations change over time.
Term
Biosphere
Definition
The largest spacial scale and highest level of ecological organization -- i.e. the Earth.
Term
Robert MacArthur
Definition
Studied warbler species in North America to see how they coexisted in their environment. The warblers were gathering insects from different parts of the trees.
Term
Stable Isotope Analysis
Definition
Analysis of the relative concentrations of stable isotopes, such as C13 and C12, in materials. This is used to study the flow of energy and materials through ecosystems.
Term
Ecosystem
Definition
All organisms that live in an area and the physical environment in which those organisms interact.
Term
Nutrients
Definition
The raw materials an organism must require from the environment to live.
Term
Epiphytes
Definition
Plants such as orchids and ferns that live on the branches and trunks of other plants. As they grow the form a "mat" as they trap organic matter, and these mats are rich in nutrients.
Term
Adaptation
Definition
Evolutionary process by which organisms increase their ability to live in a new climate regime.
Term
Biomes
Definition
Major divisions of the terrestrial environment. Biomes are distinguished by their dominant plants.
Term
What causes the variation in climates?
Definition
The uneven way in which the Earth is heated by the sun. This is due to the angle and which the Earth sits in relation to the sun.
Term
What causes wind?
Definition
Differences in temperature and moisture level in the air.
Term
Coriolis effect
Definition
Caused by the rotation of the earth which produced a deflection of winds and water currents to the right of their direction of travel in the N. Hemisphere and to the left in the S. Hemisphere. This is why winds do not move directly north to south.
Term
O Horizon
Definition
organic horizon. The top layer of soil, made up of fallen organic matter. The deeper areas of the O horizon include partially decomposed matter.
Term
A horizon
Definition
This horizon contains a mixture of mineral materials such as clay, silt, and sand. The A horizon is generally rich in mineral nutrients.
Term
B horizon
Definition
Clays, humus, and other materials that have been transported by leaching from the A horizon. This horizon has the roots of many plants.
Term
C horizon
Definition
The deepest layer of soil. It contains weathered parent material and rocks. Under the C horizon is unweathered parent material, such as bedrock.
Term
Mycorrhizae
Definition
Partnerships between fungi and root systems in which nutrients are gathered.
Term
Tropical rain forest characteristics
Definition
By the equator, warm and wet all year, organisms have evolved to use the vertical dimension of the forest.
Term
Tropical dry forest characteristics
Definition
Are found north and south of tropical rainforests, are more seasonal and have a dry season, old soils that are less acidic, and life depends on water.
Term
Tropical savanna characteristics
Definition
North and south of tropical dry forests and within 10-20 degrees of the equator. Has wet and dry seasons, and drought combines with fire to maintain the savanna. Has impermeable soils that keep moisture toward the top of the soil layers.
Term
Desert characteristics
Definition
Occur where subtropical air descends and drys the landscape. Little precipitation. Soil low in organic matter and can sometimes be classified as "lithosols" meaning stone or mineral soils.
Term
Caliche
Definition
Calcium carbonate rich soil horizon found in aged desert soils.
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