To determine: The way in which habitat fragmentation contributes to declining biological diversity.

1) Compare the biodiversity indices to one another. State a claim about the effect of pollution on the biodiversity of the stream ecosystem. Describe how the pollution levels affect the species richness and biodiversity of the stream. Justify your claim with evidence. Describe the difference in species richness you observed. Explain how human intervention can change biodiversity in positive ways.

Competition is often an important driver of early succession, while facilitative interactions tend to play a more dominate role later in succession.   True  False

Match the following definitions or descriptions of community ecology to the most appropriate vocabulary word A model where there is a unidirectional influence from lowe to higher trophic levels A model where predation mainly controls community organization. An event, such as a storm, fire, flood, drought, or human activity, that changes a community by removing organisms from it or altering resource availability. ✓ [Choose ] top-down model disturbance A term which describes most communities as constantly changing after disturbance Occurs in a virtually lifeless area where soil has not yet formed, such as on a new volcanic island or on the rubble left by a retreating glacier Occurs when an existing community has been cleared by a disturbance that leaves the soil intact secondary succession bottom-up model nonequilibrium model primary succession [Choose ] [Choose ] [Choose ] [Choose ] + +