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Sofia Guajardo | Science | 23/08/10 |
A01192133 | | |

Science

33.3 Regulation of population growth
What are two life history patterns? What types of organisms exhibit each?
Opportunisticpattern
-small individuals
-short life span
-fast to mature
-many offspring
-little or no care of offspring
-many offspring die before reproducing
-early reproductive age

Equilibriumpattern
-large individuals
-long life span
-slow to mature
-few and large offspring
-much care of offspring
-most young survive to reproductive age
-adapted to stable environment

Whatdensity-independent factors affect population size? What density-dependent factors afect population size?

The effects of the density-independent factor are the same for all sizes of population. The effect of adensity-dependent factor depends on the size of the population. The denser a population is, the faster a disease might spread.

How does competion affect the composition of a community?Competition may result in terource partitioning. When similar species seem to be occupying the same ecological niche, it is usually possible to find differences that indicate resource partitioning has occurred.Competition prevents two species of barnacles from occupying as much of the interidial zone as possible. Both exist in the area of competition between Chthamalus and Balanus. Above this area, onlyChthamalus survives, and below it only Balanus survives.

How can predation affect the population densities of both predators and prey?
Cycling could occur if the predator population overkills theprey and then the predator population also declines in number, and the prey population overshoots the carrying capacity and suffers a crash, and then the predator population follows suit because of alack of food.

What are some effective antipredator defenses?
Coevulation is present when each of the two species adapt in response to selective pressure imposed by the other. Mimicry occurs when...
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