Ch 4 vocab

1. Ecology
study of how organisms interact
2. Species
group of individuals that interbreed
3.

Population

member of the same species in the same area
4. Community
all of the populations in one area
5. Ecosystem
all living things and their environment
6. Biosphere
all parts of earth that have life
7. Bionic factor
– parts of a ecosystem that are living or once living
8. Abiotic Factors
part of ecosystem that has never been living
9. Habitat
specific environment that ant organism lives
10. Resource
anything a organism needs
11.

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Population size

number of individual organisms present in a given time
12. Population density
number of individuals within a population
13. Population distribution
how organisms are arranged in a area
14. Age structure
relative number of organisms if each age within a population
15. Age Structure diagram
– chart that shows the age distribution of a population
16. Sex ratio
proportion of males to females in a population
17. Survivorship curve
graph showing the likelihood of survival within a group or population by age
18. Emigration
movement of individual away from a given area
20.

Exponential growth

pattern of population growth in which a population increases by a fixed percentage each year
21. Limiting factor
characteristics of environment that restrict population growth
22. Carrying capacity
largest population a given environment can support
23. Logistic growth
pattern of population growth in which exponential growth is slowed and finally stopped by limiting factors
24. Density-dependent factor
limiting factor whose influence changes with population density includes competition predation and disease
25. Density-independent factor
limiting facton whose influence is not effected by population density
26.

Biotic potential

growth rate of a population under ideal conditions