Biology 1001A Lecture Notes - Ecological Succession, Secondary Succession, Primary Succession

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ochrebee715

30 Apr 2012

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Species, richness, evenness, diversity: species diversity or species richness: the total number of different species in a community, species evenness: the relative abundance of each of those different species in the community. Islands farther away from the mainland have fewer species: immigration rates are lower because it is more difficult to reach the islands. Applications of island biogeography: habitat islands: area of habitats surrounded by a sea of unsuitable habitat (example: a nature park surrounded by a large city, the patterns above apply to these environments as well. Ecological succession: a change in the species make up of a community. Primary succession: when a new community comes in and colonizes in an area where there was no previous plant growth. As plant communities change: animal communities change as well. Ecological disturbance: physical damage to a community, which removes biomass (typically the plant community is disturbed) Disturbance and secondary succession: some forests need ecological disturbance (disclimax communities need secondary successions)

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What do ecological descriptions of communities â species richness,relative abundance, species diversity â tell us about interactionsbetween species? Relative stability or health of the communitythrough time?

blackwasp560

Students inventoried the species of trees in a patch of forest near their school. They counted 55 trees and identified 12 different species of trees. Most of the 55 individual trees were either red oaks or the scarlet oaks; other species were represented by less than 3 individuals each. They then inventoried a patch of forest of equal size in a nearby national forest and found 80 trees representing 28 species of trees, and there were 2 - 4 individual trees for each species in the patch. Compared to the forest near the school, the national forest has: a. greater species richness and evenness. b. greater species richness but lower species evenness. c. lower species richness and evenness. d. lower species richness but greater species evenness.

goldfly112

11. As energy flows through the food web in an ecosystem, the amount of energy that is transferred from one trophic level to the next trophic level increases. stays the same. decreases. may increase or decrease, depending upon the system.

12. Autotrophs are organisms that obtain energy by breaking down tissues of organisms that have died. harness external energy sources to produce complex chemical compounds. depend directly on primary producers for their energy and nutrients. eat other autotrophs to obtain energy.

13. Which of the following gives the correct order for energy flow through an ecosystem? primary producers â secondary producers â tertiary producers primary consumers â primary producers â secondary producers secondary consumers â primary consumers â primary producers primary producers â primary consumers â secondary consumers

14. Which one of the following aspects of plant biology is not directly involved in maintaining an adequate supply of water for the entire plant? phloem roots xylem transpiration pull

15. Which structure(s) do most plants use to acquire the energy that they need for cellular processes? the roots the leaves the stem

Biology 1001A Lecture Notes - Ecological Succession, Secondary Succession, Primary Succession

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