Lecture 20 - population and interspecific relationships

Population

A group of the same species living in a particular place

Mortality

Death rate per thousand population per year

Natality

number of births per population 1000 per year

Age structure

The distribution of various age groups in a population

Mark and recapture

For highly mobile animals. Collect and count a large sample of organisms. Mark and release.

Commensalism - symbiosis - mutualism relationship

One organism benefits and the other is unaffected

Mutualism - symbiosis definition

A relationship between two in which both benefit.

Competition is

Not symbiosis, as they are competing for the same recourse

Amensalism definition

Not symbiosis - An interaction which one species is inhibited and the other is neither benefited or harmed