Ecology Exam 2

Proportion of ages by year are remaining the same even with population increase

Birth and death rates are equal

Competition in which a species experiences interference from many other species that deplete the same resource.

When one species does not interact with a second species directly, but with a third species that does have a direct interaction with the second.

A species whose importance exceeds its abundance

Competition - -
Predation + -
Parasitism + -
Amensalism - 0
Commensalism + 0
Mutualism + +
Neutral 0 0

Rhizobium bacteria and plants
Mycorrhizal fungi and plants
N2 fixers

Two dissimilar organisms living in close association.

The relationship between per capita consumption and number of prey.

Is increased prey consumed leading to increased predator reproduction.

Type one increases linearly as prey density rises.

2 Rises at a decreasing rate to maximum level. Saturates.

3 Has low rate of predation at first then increases in a sigmoid fashion, approaching an asymptote.

Refers to things such as Aquatic or terrestrial, Vertical and Horizontal changes.

Is species composition and relative abundance.

Number of different species

Relative abundance