varying populations & human populations

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Varying Populations & Human Populations By Nick Logan

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Varying Populations & Human Populations. By Nick Logan. A load of boring Biology terms you need to know…. Environment – Set of conditions which an organisms exists in – containing abiotic and biotic components Abiotic – Non living factors Biotic – Living factors - PowerPoint PPT Presentation

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Page 1: Varying Populations & Human Populations

Varying Populations & Human

PopulationsBy Nick Logan

Page 2: Varying Populations & Human Populations

A load of boring Biology terms you need to know….O Environment – Set of conditions which an organisms

exists in – containing abiotic and biotic componentsO Abiotic – Non living factorsO Biotic – Living factorsO Habitat – The place within the ecosystem that an

organism lives inO Ecosystem – Made up of a community of living

organisms and biotic factorsO Community – is all the populations of different

organisms living and interacting in a certain area at a certain time

O Niche – Where an organism is found within the habitat AND how that organism fits into its environment. Its role in a habitat

Page 4: Varying Populations & Human Populations

O Population – A group of interbreeding organisms belonging to the same species

Page 5: Varying Populations & Human Populations

Varying PopulationsO Sigmoid Population Curvehttp://www.youtube.com/watch?v=Vpt34kNFn9k

Page 6: Varying Populations & Human Populations

Population SizeO Limiting Factors, such as….?

They can be either abiotic or biotic factorsO Temp, light, pH, water concentration,

humidity

O Competition, predation

Page 7: Varying Populations & Human Populations

HUMAN POPULATIONS!!!

O Cheeky bit of Attenborough……http://www.youtube.com/watch?v=LwgO3i_M0tY&feature=related

Page 8: Varying Populations & Human Populations

O Basic Factors that Affect Human Population?

Page 9: Varying Populations & Human Populations

Factors that Affect Birth Rate

O Economic conditionsO Cultural & Religious BackgroundsO Social PressuresO Birth ControlO Political Factors

Page 10: Varying Populations & Human Populations

Factors that Affect Death Rate

O Age profileO Life expectancy at birth (IFM)O Food supplyO Availability of safe drinking waterO Effective sanitationO Quality of medical careO Natural disastersO Wars

Page 11: Varying Populations & Human Populations

Population StructureO Demographic Transition Model

- change in societies from a……

Page 12: Varying Populations & Human Populations

Population PyramidsO Stable Population

- birth and death rate are in equilibrium. Therefore no change in population sizeO Inc. Population

- high birth rate = wide base- typical of LEDC’s

O Dec. Population- low birth rate = narrow base- lower mortality rate = more old people- occurs in MEDC’s