| A | B |
|---|
| 3 factors that affect population size | # of births; # of deaths; immigration/emigration |
| Main charactistics of a population | geographic distribution; density; growth rate |
| immigration | The movement of organisms into a given area from another area |
| emigration | The movement of organisms out of the population |
| exponential growth | When individuals in a population reproduce at a constant rate |
| logistic growth curve | The various growth phases through which most populations go |
| carrying capacity | The largest # of individuals that a given environment can support |
| limiting factor | Biotic or abiotic resource in the environment that causes population size to decrease |
| Types of density-dependent limiting factors | competition; predation; parasitism; disease |
| Types of density-independent limiting factors | natural disastera; seasonal cycles; dams/deforestation |
| Why biodiversity is valuable | natural resource; provides foods & goods; provides medicines |
| biodiversity | The sum total of the genetically based variety of living organisms in the biosphere |
| endangered species | a group of organisms in danger of extinction |
| DDT | used to kill insects |
| Goals of conservation biology | enforce environmental laws; protect habitats; manage natural resources |
| ecological "hot spot" | An area where habitats and species are in the most danger of extinction |
