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Point Quarter Sampling

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Information about Point Quarter Sampling
Education

Published on December 1, 2008

Author: coachsteg

Source: slideshare.net

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Selected for Survival Get busy livin’ or get busy dyin’ (Andy-Shawshank Redemption)

Natural Selection Versus Artificial Selection Artificial Selection: Changing characteristics of organisms by artificial means to attain certain characteristics

Artificial Selection: Changing characteristics of organisms by artificial means to attain certain characteristics

Natural Selection Versus Artificial Selection Natural selection: A process by which organisms develop characteristics which are beneficial to their survival given biotic and abiotic factors of their environment

Natural selection: A process by which organisms develop characteristics which are beneficial to their survival given biotic and abiotic factors of their environment

Survival of the fittest That organism which has traits which better suit it to survive the current conditions is more “Fit” than other organisms…so it survives

That organism which has traits which better suit it to survive the current conditions is more “Fit” than other organisms…so it survives

Fitness Overall health and ability of a population and organisms ability to perpetuate its species. Its traits allow it to out compete other community and population members for food, water, shelter, space

Overall health and ability of a population and organisms ability to perpetuate its species. Its traits allow it to out compete other community and population members for food, water, shelter, space

Niches A species will have the best chance of survival if it occupies an empty niche.

A species will have the best chance of survival if it occupies an empty niche.

Adaptive Radiation This process is illustrated by the radiating of various species from one central species, due to biotic/abiotic factors. Occurs during reproductive isolation

This process is illustrated by the radiating of various species from one central species, due to biotic/abiotic factors. Occurs during reproductive isolation

Divergent Evolution Circumstances in environment cause the gradual adaptation of a group of a population in response to differing biotic and abiotic factors. Also occurs during reproductive isolation

Circumstances in environment cause the gradual adaptation of a group of a population in response to differing biotic and abiotic factors. Also occurs during reproductive isolation

Divergent Evolution…One more thing Homologous structures: Structures formed on differing populations which are different in form and function due to biotic and abiotic factors but with same origin

Homologous structures: Structures formed on differing populations which are different in form and function due to biotic and abiotic factors but with same origin

Convergent Evolution Various species in a common environment develop similar traits as a response to the biotic and abiotic factors of the environment

Various species in a common environment develop similar traits as a response to the biotic and abiotic factors of the environment

Convergent Evolution…One more thing Analogous structures: Structures which form on different populations of organisms which are similar in form and function but with differring origins

Analogous structures: Structures which form on different populations of organisms which are similar in form and function but with differring origins

Gradualism The concept that evolutionary changes occur over long periods of time Genes: Allows for randomness and similarity within populations

The concept that evolutionary changes occur over long periods of time

Genes: Allows for randomness and similarity within populations

Relative Frequency Probability of an alleles presence in a population

Probability of an alleles presence in a population

Genetic Drift Random change in the frequency of a gene

Random change in the frequency of a gene

Equilibrium Relatively no change in populations adaptations over long stretches of time

Relatively no change in populations adaptations over long stretches of time

Speciation Development of new species from existing ones due to evolution. Occurs during reproductive isolation

Development of new species from existing ones due to evolution. Occurs during reproductive isolation

Reproductive Isolation Caused by: Natural catastrophes (fire) Environmental shift Geographical changes

Caused by:

Natural catastrophes (fire) Environmental shift

Geographical changes

Extinction The loss of species due to natural or artificial selection

The loss of species due to natural or artificial selection

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