learning target: population density & distribution ch. 14.3 (pp. 436 – 439)
DESCRIPTION
KEY CONCEPT: Each population has a density, a dispersion pattern, and a reproductive strategy. Population density – is a measurement of the average number of individuals in a defined space. # of individuals = Population density Area (units 2 ) e.g. 28 turkeys in a field of 4-square acres is 28 turkeys = 7 turkeys / acre 2 or 7 turkeys 4 acres 2 per square-acre NOTE: the unit is squared NOT the number before the unitTRANSCRIPT
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Learning Target: Population Density & DistributionCh. 14.3 (pp. 436 – 439)
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I Can…Explain how population density, dispersion patterns and survivorship curves, affect the reproductive strategies of a species.I Will…• Calculate the density of a population of organisms
in a given area.• Describe the dispersion pattern of organisms in a
given area.• Infer what type of intraspecies and interspecies
relationships cause specific patterns of dispersion.• Describe the three types of survivorship curves.• Infer connections between survivorship curves and
reproductive strategies.
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KEY CONCEPT: Each population has a density, a dispersion pattern, and a reproductive strategy.
Population density – is a measurement of the average number of individuals in a defined space.
# of individuals = Population density Area (units2)e.g. 28 turkeys in a field of 4-square acres is28 turkeys = 7 turkeys / acre2 or 7 turkeys 4 acres2 per square-acre
NOTE: the unit is squared NOT the number before the unit
![Page 4: Learning Target: Population Density & Distribution Ch. 14.3 (pp. 436 – 439)](https://reader036.vdocuments.mx/reader036/viewer/2022062311/5a4d1b097f8b9ab05998997f/html5/thumbnails/4.jpg)
Population dispersion – the way in which individuals of a population are spread in an area or volume.
Clumped dispersion – individuals live close together in order to facilitate mating, gain protection, or access food resources.
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Uniform dispersion – Territoriality and intraspecies (within species) competition for limited resources leads to individuals living at specific distances from one another.
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Random dispersion – Individuals are spread randomly within an area or volume. Species often solitary with few competitors and few natural predators.
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Survivorship curve – generalized diagram showing the number of surviving members over time from a measured set of births.
Type I – low level of infant mortality (death) and population survives to old age. Common in large mammals and humans.
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Survivorship curve
Type II – Survivorship rate is equal at all ages of an organism’s life. (Equal chance of living or dying at anytime)Common in birds, small mammals, and reptiles.
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Survivorship curve
Type III – Very high birthrate and very high infant mortality (death) rate.Common in invertebrates (no backbone), fish, amphibians, and plants
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Survivorship curveReproductive strategy – reproductive practice that provides a survival strategy for a species. e.g. Fish (Type III) lay hundreds of eggs to ensure at least some offspring reach adulthood without being eaten and are able to reproduce.