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Speciation

Speciation. …is the formation of a new species as a result of gradual changes within a population. 3 events lead to speciation: separation, adaptation and division. 1. Separation. Part of a population becomes separated from the rest.

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Speciation

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  1. Speciation …is the formation of a new species as a result of gradual changes within a population. 3 events lead to speciation: separation, adaptation and division.

  2. 1. Separation • Part of a population becomes separated from the rest. • They may be separated by a Geographical isolation like a canyon, river, a mountain range, or being on an island.

  3. Other kinds of separation are… • Ecological isolation – Species are in the same area but live in different habitats. • Temporal isolation – Species are in same area but are active at different times of the day or reproduce in different seasons.

  4. 2. Adaptation • After the groups are separated, each group continues to be affected by their environment: • Different traits can be favorable or unfavorable in different environments. • Over many generations, different traits may spread through each population.

  5. 3. Division • The 2 separated populations can become very different from each other. • With time the members of the 2 populations may be unable to interbreed successfully. http://www.floridapanthernet.org/index.php/handbook/history/range_of_the_florida_panther/http://news.discovery.com/big-cats/

  6. Fig. 23.6 Four species of leopard frogs: differ in their mating calls.

  7. These squirrels live on opposite sides of the Grand Canyon.

  8. The Channel Island Fox The California Grey Fox

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