Unit Eight: Community Ecology- module c

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Why do communities and ecosystems change

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12 Terms

1

Why do communities and ecosystems change

by basis of interactions among populations and disruptions to enviroments

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2

How is the structure of a community measured and described

in terms of species composition and species diversity

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3

What is the Simpson’s Diversity Index

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4

What determines how populations access energy and matter within a community

interactions

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5

What are the characterizations of relationship interactions

positive and negative

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6

What are examples of positive and negative characterized interactions

predator/prey interactions

trophic cascades

niche partitoring

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7

What can drive population dynamics

competition

predation

symbiosis

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8

What are the types and results of symbiosis

parasitism- positive/negative

commensalism- postive/neutral

mutualism- positive/positive

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9

What does cooperation or coordination between organisms, populations, and species result in

enhanced movement of matter and energy

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10

What communities are less resilient to changes within the environment

communities with low component parts and little diversity

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11

What can influence the organization of the ecosystem

diversity of species

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12

What is important about keystone species

regardless of abundance, they hold up ecosystems, removal almost always results in ecosystem collapse

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