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The Galapagos Islands

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The Galápagos Islands:
The Galápagos Islands are a small, but unique group of islands in the pacific, approximately 1000km west of South America; the islands were discovered in 1935 by the Spanish. Their volcanic origin should make the islands uninhabitable, but in fact, it’s actually teaming with life on the island. The current between the islands is hot and cold, giving it a good diversity, which means there is a variety in living organisms in that area. Life is everywhere on the islands because the animals have learnt to adapt to the conditions, this means that over time, an animal has change in order to fit in with its environment. A few examples of the animals on the islands are the Galápagos sea lion, the Galápagos land iguana, the marine iguana, the red, red rock crab, the white-tip reef shark, the brown pelican and flamingos. The islands are famous for their large number of endemic species, also because they were studied by Charles Darwin during the voyage of the Beagle. His observations and collections contributed to the inception of Darwin's theory of evolution by natural selection.
The group of islands are split into the main islands and the minor islands. There are 18 main islands, these are: Baltra Island, Bartolomé Island, Darwin Island, Espanola Island, Fernandina Island, Floreana Island, Genovesa Island, Isabela Island, Marchena Island, North Seymour Island, Pinzón Island, Pinita Island, Rábida Island, San Cristóbal Island, Santa Cruz Island, Santa Fé Island, Santiago Island, and finally Wolf Island. The minor Islands are: Daphne Major, South Plaza Island, and finally the Nameless Island. The islands are pushed to the west because of the movement in tectonic plates, these move the islands an inch or two a year, so the oldest Galapagos Islands are in the west and the youngest are in the right.
The extraordinary collection of islands formed from a mantle plume, which was a huge hot spot of magma that rose and erupted at the surface of the ocean. The underwater volcano has been active for millions of years and it was an artery near to the centre of the earth. Española Island is the oldest of the Galapagos Islands. The Galapagos plumes have not produced a linear chain of islands similar to the Hawaiian Islands, but rather a loose collection of islands. Some geologists believe that the Galapagos mantle plume could be about 90 million years old.
Natural Selection is the process in nature by which, according to Darwin's theory of evolution, only the organisms best adapted to their environment tend to survive and transmit their genetic characteristics in increasing numbers to succeeding generations while those less adapted tend to be eliminated.
Natural selection is a big deal when it comes to the islands, and the diverse living conditions causes species to form sub species. One of the species on the islands is the land iguana, which has a sub species called the marine iguana, which is the only sea going lizard. The marine iguana has some amazing and unique adaptations to fit in on the Galapagos Islands, although these iguanas look fierce, they survive exclusively on algae and seaweed. They are adapted to have short, blunt snouts and small, razor-sharp teeth which help them to scrape algae of the rocks. They also are adapted to have laterally flattened tails to help them move like crocodiles in the water, as well have having long, sharp claws to help them cling on to rocks on shore or underwater in heavy currents. Also their cold bloodedness means that they can only stay in the cold sea water for a short amount of time before they seize up, and are unable to move efficiently, because of this they have developed to have the ability of being able to dive up to 9m deep, and once they’re out of the water, they can warm up rapidly due to their dark grey skin colour. Another remarkable adaptation they have is their ability to excrete excess sea salt through special salt glands in their nostrils. Finally, if there is a famine on any of the islands, it has been recorded that the marine iguanas become thinner and shorter and then regrow when the amount of food becomes plentiful again. They do this because the amount of food they take in is linked to their bones, so if there is less food they will need smaller bones to help them survive.
Marine iguanas are remarkably well adapted to their environment, but on a few of the Galapagos Islands, it has been noticed that the minority have been feeding on the terrestrial vegetation. This could be due to selection pressures, which is a factor that affects the reproduction of a population, and since there is a decreasing amount of nutrition on the sea algae, there might be a very dramatic effect that occurs, causing a new species of iguanas to evolve.
Charles Darwin's visit to the Galapagos in 1835 is one of the most famous few weeks in the history of science. Darwin started to develop his theory of evolution by natural selection within two years of his return to England and his book the ‘Origin of species’ was the pivot about which most of the scientific community was persuaded to accept evolution during the 1860s. You could say that his visit to the Galapagos Islands played a major part in him developing his ideas on evolution and natural selection.
Charles Darwin studied the finches on the various islands; he noticed that the finches on the different islands there were fundamentally similar to each other, but showed wide variations in their size, beaks and claws from island to island. For example, their beaks were different depending on the local food source. Darwin concluded that, because the islands are so distant from the mainland, the finches that had arrived there in the past had changed over time. Darwin concluded that in each locality one or more individual finch happened to acquire, by random mutation, a beak shape more suitable for the food sources in that locality. These individuals then had a competitive advantage over their fellow finches, enabling them to grow and reproduce more successfully, and pass on their more specialised beaks to successive generations, until eventually the characteristics had spread throughout the finch population in that locality. There are currently 14 different types of finches amongst the Galapagos Islands, they are the world’s fastest-evolving vertebrates because their appearance and behaviour quickly adapted to this closed and rapidly changing environment. Darwin said "an immigrant first settled on one of the islands, ... it would undoubtedly be exposed to different conditions in the different islands (where) it would have to compete with a different set of organisms. ... Then, natural selection would probably favour different varieties in the different islands.” Basically, what he was trying to say was that beaks changed as the birds developed different tastes for fruits, seeds, or insects picked from the ground or cacti. Long, pointed beaks made some of them more fit for picking seeds out of cactus fruits. Shorter, stouter beaks served best for eating seeds found on the ground. Eventually, the immigrants evolved into 14 separate species, each with its own song, food preferences, and beak shapes. Warbler finches, for example, catch insects in beaks that are sharper and more slender than those of cactus eaters.
Important definitions relating to the report:
Speciation – Speciation is the formation of a new species as a result of geographic, physiological, anatomical, or behavioural factors that prevent previously interbreeding populations from breeding with each other.
Niches – Niches are the specific area where an organism inhabits (ecology), or the role or function of an organism or species in an ecosystem.

Natural selection – Natural selection is the process by which plants and animals that can adapt to changes in their environment are able to survive and reproduce while those that cannot adapt do not survive.
File:Galapagos Islands topographic map-en.svgThis image shows the Galapagos Islands, and their positioning in the Pacific Ocean.

Photo: A marine iguana basking in the sun
This image shows a marine iguana, with its distinctive white ‘wig’ of salt expelled from glands located near their noses.

Darwin's drawings of the different heads and beaks he found among the finches on the Galapagos Islands
This image shows Darwin’s drawings of the different heads and beaks he found among the finches on the Galapagos Islands

Bibliography: http://www.youtube.com/watch?v=hdOPerYAFZ0 http://en.wikipedia.org/wiki/Gal%C3%A1pagos_Islands#Physical_geography http://www.galapagosislands.com/galapagos-natural-wonders/galapagos-geology.html http://animals.nationalgeographic.com/animals/reptiles/marine-iguana/ http://www.galapagos.org/about_galapagos/reptiles/ http://darwin-online.org.uk/EditorialIntroductions/Chancellor_Keynes_Galapagos.html http://www.bbc.co.uk/schools/gcsebitesize/science/aqa_pre_2011/evolution/evolutionrev1.shtml http://www.truthinscience.org.uk/tis2/index.php/component/content/article/53.html http://eu.earthwatch.org/expeditions/darwins-finches-and-natural-selection-in-the-galapagos http://www.news.harvard.edu/gazette/2006/08.24/31-finches.html http://dictionary.reference.com/ http://www.biology-online.org/dictionary/Niche http://www.merriam-webster.com/dictionary/natural%20selection

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