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It's an island which was once connected to a continent but was separeted from it either with the increase of sea levels which formed a barrier or by moving continental plates. Examples: Madacascar, Great Britain.<br> | It's an island which was once connected to a continent but was separeted from it either with the increase of sea levels which formed a barrier or by moving continental plates. Examples: Madacascar, Great Britain.<br> | ||
===What is an oceanic island?=== | ===What is an oceanic island?=== | ||
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This kind of island was never connected to a any continent. They came out of the seafloor "beneft of life" as for instance growing volcanoes. Examples: Hawaïan Islands, Galàpagos Archipelago.<br> | This kind of island was never connected to a any continent. They came out of the seafloor "beneft of life" as for instance growing volcanoes. Examples: Hawaïan Islands, Galàpagos Archipelago.<br> | ||
===What | ===What are the main differences continental and oceanic islands?=== | ||
. | There are many types of native species we can oberve on continents and continental islands that are absent on oceanic islands. Darwin "noted" that this was hard to explain from a creationist point of view, becausoe the question would be why would a creator put some species on certain islands and not on others? Moreover, why should the way in which the island was created make a difference?<br> | ||
Version du 24 mai 2011 à 14:33
The Geography of Life
==Intro: The distribution of species around the world are surprisingly specific. In each place inhabitants live because they are adapted to their land. But also huge changements occured all along the years since the very first species, due to geological relations. We name it the biogeography. Nowadays, we justify biogeography with three important developements: -Information from DNA, and... -Continental drift,... -Molecular taxomony,...==
make a short introduction before digging the subjet [[ Utilisateur:Pierre.brawand|Pierre.brawand]] 19 avril 2011 à 22:45 (CEST)
Continents
What is convergent evolution?
Convergent evolution explains how two differents spieces that live in similar habitats can look and behave in the same way, because of their environment.
Convergent evolution proves three evolutionary theories:
1. Common ancestry, which explains the features shared (ou pas) between two infraclasses of mammals.
2. Speciation is the process by which a common ancestor can generate several different offsprings.
3. Natural selection expresses how each spieces adapted to its own environment.
How can similar species live in similar habitats but on different continents?
Indeed, although...
Islands
Darwin realised that islands play a very important role in the theory of evolution. Before we got to this evidence, we have to distinguish two types of islands: the continental and the oceanic ones.
What is a continental island?
It's an island which was once connected to a continent but was separeted from it either with the increase of sea levels which formed a barrier or by moving continental plates. Examples: Madacascar, Great Britain.
What is an oceanic island?
This kind of island was never connected to a any continent. They came out of the seafloor "beneft of life" as for instance growing volcanoes. Examples: Hawaïan Islands, Galàpagos Archipelago.
What are the main differences continental and oceanic islands?
There are many types of native species we can oberve on continents and continental islands that are absent on oceanic islands. Darwin "noted" that this was hard to explain from a creationist point of view, becausoe the question would be why would a creator put some species on certain islands and not on others? Moreover, why should the way in which the island was created make a difference?
AllanP 5 avril 2011 à 14:37 (CEST)
EstelleV 5 avril 2011 à 14:49 (CEST)
HéloiseD 7 avril 2011 à 11:09 (CEST)
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