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Allopatric speciationSimilar species - separate geographical areas
Similar species - separate geographical areas
Allopatric speciation
Geographic barriers
• Mountain ranges
Water separating land masses (for terrestrial species)
Geographic barriers
Geographic barriers
Land separating bodies of water (for aquatic, especially freshwater species)
Geographic barriersGlaciers
Geographic barriersValleys
Squirrels separated by the canyon
Adapted by becoming more camouflaged
Adapted by mimicking poisonous species
Allopatry• Gene flow• Different selective pressures• Reproductive isolation
New Zealand separated from Australia before mammals appeared
• Many bird species have changed due to geographic isolation
some species lost the ability to fly mountain ranges emerged to separate populations
of species such as wren, robin and hebe
video
• Wolfe: Allopatric speciation
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