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Cards In This Set
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WHAT CONTROLS GLOBAL PATTERNS OF SPECIES DIVERSITY AND COMPOSITION?
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- Evolutionary histories.
- Geographic area and isolation. - Global climate. |
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TWO IMPORTANT POINTS WALLACE MADE ON GLOBAL PATTERNS INCLUDE..?
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- Earth's land mass can be split up into 6 regions.
- Species diversity varied with latitude with the greatest in the trophics. |
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WHAT IS CONTINENTAL DRIFT?
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- The process where currents generated in Earth's molten rock mantle (magma) move sections of Earth's crust across its surface thereby seperating land.
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WHAT IS VICARIANCE?
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- Evolutionary seperation of species due to a barrier such as continental drift.
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IS THE OCEAN SEPERATED BY A VICARIANCE LIKE LAND IS? (ARE THERE BARRIERS TO DISPERSAL BETWEEN OCEANS AS THERE IS LAND)
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- Yes, continents, currents, thermal gradients, and differences in water depth has allowed for isolation of species and allowed for evolutionary change.
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WHAT ARE HOTSPOTS?
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- Regions with high spcies diversity at a particular longitude.
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SOMETIMES THERE IS NOT A DECREASE IN SPECIES RICHNESS AT HIGHER LATITUDES SUCH AS SOME TEMPERATE BIRDS. WHY?
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- Marine productivity is substantially higher in temperate and polar oceans.
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LARGE SCALE GLOBAL PATTERNS OF SPECIES RICHNESS IS CONTROLLED BY THE RATE OF WHICH PROCESSES?
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- Speciation.
- Extinction. - Migration. |
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HOW IS SPECIES DIVERSITY CONTROLLED IN DIFFERENT REGIONS? (ie. ISLANDS AND MAINLAND)
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- By area and distance due to balance of extinction and immigration rates.
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WHAT IS SPECIES-AREA RELATIONSHIP?
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- Pattern where species richness increases with increasing area sampled.
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HOW IS AREA AND DISTANCE RELATED TO SPECIES RICHNESS?
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- Increases with area.
- Decreases with distance. |
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WHAT ARE CONSIDERED ISLANDS?
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- Any isolated areas surrounded by dissimilar habitat.
- Ie. Mountain islands surrounded by valleys; lake islands surrounded by land, etc. |
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WHAT IS THE PATTERN OF ISLAND AND ISLAND-LIKE HABITATS REGARDING SPECIES RICHNESS AND SIZE OF ISLANDS?
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- Large islands have more species than small islands.
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HOW DOES DISTANCE RELATE TO SPECIES RICHNESS OF ISLANDS AND ISLAND-LIKE?
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- The futher an island is from the main source of species, the less species it has.
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WHAT IS THE EQUILIBRIUM THEORY OF ISLAND BIOGEOGRAPHY?
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- The number of species on an island or island-like habitat depends on balance between immigration and extinction rates.
- An empty island fill up with species fast, but then level out. As the number of species increases, the number of extinction also increases. |
