Evolution of Darwins Finches

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by luksy99
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Evolution of Darwins Finches

The Galapagos Islands

Case Study of the divergent evolution of Darwin's Finches through the process of natural selection.

The Evolution of Darwin's Finches

All of Darwins Finches evovled from a single speices, the Geospiza magnitostris, more commonlly known as the large ground finch, which migrated from mainland south america.

Natural SelectionNatural Selection: the process by which forms of life having traits that better enable them to adapt to certain enviromental pressures, such as predators, changes in climate or competition for mates, will tend to survive and reproduce in greater numbers than others of their kind, thus ensuring the continuing of these favourable traits in succeeding generations. Natural selection is more commonly known as survival of the fittest. There are four different types of evolution. They are known as convergent, divergent, parallel and co-evolution. Convergent: unrelated species developing similar traits due to similar enviromental preasures.Divergent: traits held by a common ancestor evolve into different variations over time.Parrallel: species from similar origins evolve similar traits over time.Co-evolution: closely intergrated species exerting selecction preasures on each other.

Selection Mechanism The major slection mechanism in the evolution of Darwin's Finches was the competition for food. This resulted heavily in the change of beak shape in different species of finches. Soon the speices discovered there was differnt tempratures on different islands due to there distance apart.

Background of Darwin's FinchesDarwins Finches are located on the Galapagos Islands. Their original ancestor is the common ground finch, the Geospiza magnirastris, which migrated to the islands from mainland south america. There are now fourteen different species of finch as a result of Geospiza magnirastris moving to different islands in the galapagos region, these species differentiate in size and shape, beak type and colour. As time has gone these species have specialized themselves for their specific island, resulting (after a long period of time) in the eventual differentiation of DNA, which means they can no longer inter-breed. Darwin's Finches are a good example of micro-evolution. they show us finches can change their morphology, and that natural selection plays a large role in this.

Galapagos Islands Large Ground Finch

The Comparing of Different SpeciesGeospiza magnirastris (Ground Finch), Certhidea olivacea ( Warbler Finch) and Geospiza conirostris ( Cactus Finch) are three of the species of finches that live on the Galapagos Islands. these three i have chosen to compare because of their vast diversity in beak size and shape. The Cactus Finch has an elongated, pointed beak for picking seeds from cacti. The Ground Finch, by comparrison, has a shorter, stouter, stronger beak used for picking seeds from the ground. Different again is the beak of the Warbler Finch, which uses its sharp slender beak for pulling insects from the ground and air. Each of these speices live seprately and have adapted in order to thrive in their indavidual enviroment through the process of natural selection.


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