PPt.7: Population Ecologoy Unit 1 Flashcards Preview

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Flashcards in PPt.7: Population Ecologoy Unit 1 Deck (15):
1

Groups of actually interbreeding organisms that usually inhabit a specified area
-grow by multiplication

Population

2

Function of ________ by birth and immigration and ________ due to death and emigration

Additions, losses

3

5 factors affecting population growth

1) Death rate of the organism under ideal conditions
2) Number of offspring produced by an organism over its lifetime called fecundity
3) Length of organism's reproductive life span and ability to conceive
4) The frequency with which organisms reproduce
5) Age of first reproduction

4

Perennials

Iteroparous

5

Annuals

Semelparous

6

Oscillate above and below
-Human population grown exponentially for 2,000 years

Stable limit cycle

7

Type 1:

Low mortality through most of lifespan

8

Type 2:

Constant mortality throughout lifespan

9

Type 3:

High initial mortality, followed by period of much lower. relatively constant losses

10

2 Population Control Factors

1) Density Independent= No greater or lesser effect on an individual
2) Density Dependent= Directly related to population density

11

A struggle for resources which are needed and have a limited supply

Competition

12

Rates will increase as prey densities increase because it will be easier to find the prey`

Predation

13

Greater the population density, the more likely spread of parasites, which must depend on their host

Parasitism and Disease

14

In a closed environment, microbes may produce toxic metabolic wastes that poison them

Self-poisoning

15

If the pressure becomes too severe, some members of the population may leave to avoid the consequences of overcrowding and resource depletion

Emigration