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22 Cards in this Set

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Around during the Pleistocene due to glaciation. Land mass connecting Alaska and Siberia (Eastern Europe). It was a corridor for dispersal where animals from Alaska could make it over to Siberia and vice versa.
filter, allows animals to get from place to another
blocks animals from getting from once place to another
relict is a population
Relict is talking about the population of species
refuge is a place
and the refuge is where the animals are stuck
where a species is limited and where it is from
Allopatric Speciation
two species living in same area, overtime a mountain range forms, the population splits into two, the mountain in a barrier and the species become to speciate. (mountains, oceans, deserts) changing species Ex. Squirrels in the Grand Canyon, the barrier is the canyon
Spotted cowry: allopatric speciation, barrier is the Isthmus of Panama
overtime, after the barrier is gone, the 2 species once separated that have changed over time and these animals mate and a hybrid is born (liger, tigon)
Sympatric Speciation
1 species speciates even though they live together, continuous population, genetic mutation. 2 species diverge due to genetic defect.
100 tulips in the same flower bed, flowers can self-fertilize, one flower, self-fertilizes itself. Non disjunction event during meiosis
Ex. Tomatoes, fruits
Disjunct species
species in evolutionary stasis
Sweet gum trees in Asia and N. America
2 populations of same species are separated by a large area or distances are known as disjunct species. TRUE
Evolutionary Stasis
small change over a long time
Ex. Oak trees and maple trees: species in evolutionary stasis
species that look identical but are genetically different
Ex. 2 flowers have same morphology but have different genetics,
physical characterstics
Great American Interchange
The Isthmus of Panama forms North America and South America together
Animals can go freely from North American to South America and vice versa
****More animals from North America go to South America
Mammals in North America outcompete mammals in South America
More extinction of South American of native mammals than in North America
****Primates got to Africa from South America is island hopping
Mammoth Steppe: the Siberian part of Beringia apart from the landmass
Mammoth Steppe
the Siberian part of Beringia apart from the landmass
in the Pleistocene, Beringia existed. There was a similar land mass between England and Europe
single large or several small Who contributed to it?
Jared Diamond, Simberloff
Where did Lovejoy do his work?
How are the mountains in Europe?
east to west
How are the mountains in North America?
north to south
Did dinosaur bones give evidence of glaciation?