The flashcards below were created by user
dante01
on FreezingBlue Flashcards.
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Dot map
shows distribution of observation sites
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Choropleth map
an extrapolation of a dot map data
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Rapoport's Rule
- -Ranges are increasing, and number of species decreasing with increasing elevation
- -Larger ranges in Polar regions
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Endemism
species has a small range, only found in one particular place
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Types of endemism
- 1. Neoendemic
- -result of recent evolution and speciation in an area a species is found(New species)
- 2. Paleoendemic
- -endemic now, larger range in the pastÂ
- -Sequoia
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Circumpolar taxa
found around the artic or antarctic circles
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Pantropical taxa
found in the tropical zone
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Temperate taxa
found in middle latitudes
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Disjunct distribution
-ranges are divided into two or more geographically separate parts
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Amphiregional distribution
taxa have two widely separated geographic ranges
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Amphioceanic
taxa occur on opposite sides of ocean
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Biopolar
taxa are found in cold polar regions but not in the warmer mid-low latitudes
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Biogeographic relicts
once had larger distributions but have become narrow endemics
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Glacial relicts
- were widespread during the ice age
- -Ex. Range of Alpine marmot
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Evolutionary relict
- -paleoendemics that are survivors of formerly more widespreade and diverse evoultionary lineages
- -Ex. Tuatara:lizardlike reptile of New Zealand
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Vicariance
an environmental event that divide the ranges of species into geographically isolated distributions
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