Population, community, ecosystems

what is a population

group of organisms of the same species living in an area at one time

What is a community

all the populations living in one area at one time

What is an ecosystem

all the living organisms living in an area, and their biotic and abiotic interactions

Practical for comparing population size : what should you always do to avoid bias?

always use a grid and random number generator to avoid biased quadratic placement

Practical for comparing population size :
Overview

Use quadrats a grid and random number generator, count all grids that have half of the space covered. Calculate average and multiply by space of grids.

What are some things that might affect the abundance of a species

competition, predators, interactions

What are some things that might affect the abundance of a species (abiotic)

water availability, mineral availability, temperature