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Lecture 7 ecology
Terms in this set (12)
India/SE Asia : oriental
What is Wallace's Line?
A line where there is a fairly abrupt difference between the faunas,
Deep ocean trench
Between Australian and oriental relms
What explains much of the evolutionary history of the diversity of plants and animals?
- Timing of connections between different contines
- Subsequent divergence of isolated populations
What is the theory of plate tectonics?
Based on observation of magentic field of rocks different ages on the sea floors
Rocks take on magnetic orinetaion of the earth's magnetic field at the time they soldiify as magma
What is the lithosphere
solid outer layer of earth
dividied into plates, which lie on hot, semi molten portion of mantle capable of gradual flow
What are rift zones?
Plates moving apart
Most in oceans occurs near volcanic islands, causes earth quakes possibly
What occurs when at convergent plate boundaires? What are the different situations?
1. sea floor w/ sea floor --> creates a subduction zone and trench
2. Sea floor with continent --> subduction zone; trench; possibility of mountains
3. Contient with continent --> mountains
What are fault zones?
plates slide alongside each other
earthquakes from this as well
What are hot spots?
Plate movement across a fixed-position plume of magma results in a series of volcanoes and islands of different ages
When was pangea present?
>200 milion years ago
Laurasia and gondwanaland
200 million years before present
What does plate tectonics and continental drift explain
fossil pattersn, relationship sbetween extant species, coal beds in antarctice
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