Biodiversity By: Adrian Gomez

Types of Diversity

• Genetic diversity-involves the range of all genetic traits, both expressed and recessive

• Species diversity- # of different species that inhabit a specific area

• Ecosystem diversity- range of habitats that can be found in defined area composed of both biotic and abiotic components

Natural Selection

• How organisms evolve • Shows what organism has adapted, survived, reproduced,

and pass it on to off springs in new environment• Without a change in environment, evolution nor natural

selection would occur

Stabilizing Selection

• Affects the extreme of the population

• Most common from of natural selection

• Individuals that deviate too far from normal conditions are removed

Directional Selection

• Affects the extreme of the population

• Do very well in future generations

Disruptive Selection• Acts against individuals

that have the avg condition

• Favor individuals at the extreme ends

• Population is almost split in two

• Evolution occurs

Evolution• Change in the genetic

composition of a population during successive generations as a result of natural selection acting on yhe genetic variations among individuals and resulting in the development of new species

Speciation

• When segments of a population of one species become so isolated that gene flow stops

• 3 types of adaptive radiation:• General radiation-species develop new abilities to reach new parts of

the environment• Environmental change-species that can survive in radically changed

environment and branch into new species• Geographic isolation-isolated ecosystems can be colonized by a species

that undergoes rapid evolution

Convergent Evolution

• Process whereby organisms not closely related to each other independently acquire characteristics while evolving in separate and sometimes varying ecosystems

Parallel Evolution

• When 2 species evolve together at the same time and in the same ecosystem and acquire similar characteristics

Ecological Succession

Extras

2 links• http://plato.stanford.edu/e

ntries/biodiversity/

• http://www.nwf.org/Wildlife/Wildlife-Conservation/Biodiversity.aspx

Video link• http://youtu.be/3JeYaFGYOSM