Ecology of The Sonoran Desert Soil Crusts
Ecology Vocabulary answer Sheet
Using the chalk board or overhead, have the students take these notes. give plenty of examples using personal interactions. For example, competition could happen when you are trying to get into line at McDonalds (Comensalism) .
D. Symbiosis: everyone wins and nobody loses [you cut grass that your friend uses to make a hat for you to cut more grass....]
E. Coöperation: both help each other [friends who help each other get their chores done so they can have fun]
F. Compensatory: to avoid competition an organism will use other resources [They want all the Good-n-Plenty so you eat all the popcorn at the theater]
II. Habitat Origin
A. Native: an organism that was discovered in its niche as opposed to introduced to its niche.
B. Invaders: a non-native that takes over space and habitat of a native
C. Increasers: a population that is recruiting more new individuals than dying. (a net increase)
D. Decreasers: a population that is dying more than it recruiting new individuals.(a net decrease)
III. Desert Adaptations
A. Drought avoiders: plant dies off and leaves only seeds to with stand the drought.
1. Deciduous: drops its leaves.
2. Annual: lives for only a year or part of the year
B. Drought Resistant
1. Perennials: lives on year after year
2. Evergreen: never drops its leaves
3. Succulents: a plant that holds its water instead of waiting for it to fall.
C. Water Preferences
1. Xerophytic: likes dry climates
2. Mesophytic: likes moist climates
3. Halophyte: likes salty soils
D. Root types:
1. Tap root: Main root greater than 6 feet. Only found near washes (mesquite)
2. Surficial root: Less than 12 inches- (cacti)
3. Generalized: A deep root along with a surficial system (Creosote)
The University of Arizona
Department of Biochemistry and Molecular Biophysics
General Biology Program for Secondary Teachers