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Light - Marine Ecosystems
Light is a limiting factor in the ocean as it contributes significantly to organic production and distribution of marine life. The ocean is divisible on the basis of the light penetration into two horizontal zones:
1. The lighted photic or euphotic zone extending from the sea surface up to a depth of 200 metres, where sufficient light reaches to support photosynthesis. This photic zone, also called the epipelagic one, is characterised by sharp gradients or light, temperature and salinity. The amount of light reaching the lower level of this zone rarely exceeds 0.0001% of what is received at the surface. Below this is the
2. Aphotic or lightless zone which distinguishable into three further sub-zones
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CHARACTERICTICS OF PLATYHELMENTUS
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