Biology

Estimating Population Sizes-

• Population is all the organisms of one species in a habitat
• Community is populations of different species in a habitat
• Qudrat: square frame, study small area and scale up,
• Capture Recapture: capture and mark and recapture, population size=(1st sample x 2nd sample) / 2nd sample marked, accuracy, changes
• Sample size affects accuracy

Ecosystems and Distrabution of Organisms-

• Ecosystem is all the organisms living a particular area (as well as non living (abiotic) conditions)
• A habitat is the place where an organism lives
• Ecosystems are self-supporting, everything is recycled within the ecosystem, the only thing outside is an energy source (sun)