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Introduction Oceans and seas cover over 70 of the worlds surface and include some of the most productive environments on the planet Michaelis Carocci 2000 There are an estimated 300000 know marine species and they represent more phyla than in terrestrial environments Life is unevenly distributed with areas of the deep oceans relatively void of life compared to coastal regions Species diversity is higher in coastal rather than oceanic regions and higher in tropical regions than arctic and temerate zones Andre 2005 Marine environments provide a wide range of physical conditions that organisms have become highly adapted to In coastal areas for example many organisms are euryhaline and eurythermal withstanding the wide fluctuations of salinity and temperature in their environments Pelagic species living in the water column are adapted for floatation The majority of species are benthic and have adapted to remain on the sea floor and sustain high pressures CHAPTER 12 2005 Doberski 2005 Adaptations to marine life across different phyla Phylum Chordata Marine mammals such as the bottlenose dolphin Tursiops truncatus show many adaptations to life in the water As they originated from terrestrial environment they must come to the suface to breathe air Adaptations for this include having a blowhole with a strong valve which opens briefly ensuring no water enters the lungs located on the top of their heads so that they can breath whilst the rest of their body remains in the water They give birth to precocious young that are able to swim to the surface to breath immediately and maintain homeostasis ANON Ocean Life Dipper 2005 As water has a high viscosity and is hard to move through dolphins have adapted a streamlined body shape replacing the top layer of skin cells as often as every 2-4 hours helping to keep the body surface smooth and have few external appendages such as hindlimbs which create drag They have also developed a strong tail for
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