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  • Malaysia's leader said on Saturday communications aboard a missing jet were switched off and its course deliberately changed by someone on board before the aircraft disappeared a week ago, but stopped short of saying it had been hijacked.

  • Ukraine braced on Saturday for a breakaway vote in Crimea as deadly violence flared again in the ex-Soviet country's tinderbox east amid the biggest east-west showdown since the Cold War.

  • Finally, the TRS chief K Chandrashekhara Rao has broken his silence over possibility of an alliance with the Congress in Telangana. After saying a firm 'no' to merger with the Congress, KCR has now ruled out any alliance with the Congress in both Assembly and Lok Sabha elections to be held on April 30.

  • The Bharatiya Janata Party's much anticipated list of Lok Sabha candidates is expected shortly which will end the the suspense over who will contest from Varanasi - its prime ministerial candidate Narendra Modi or party veteran Murli Manohar Joshi.

  • The Delhi High Court has confirmed death penalty to all four convicts of the December 16 Delhi gangrape and murder case. The four were convicted in September 2013 for raping and murdering a 23-year-old paramedical student.

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    Home >> Science >> Aquatic Ecosystems

    Aquatic Ecosystems

    71% of the earth’s surface is covered by marine ecosystems. Marine ecosystems can be divided into many zones depending upon water depth and shoreline. They cover approx. 71% of the earth’s surface and contain 97% of the planet’s water.

    0.80% of the earth’s surface is covered by freshwater ecosystems. Fresh water ecosystems contain 41% of the world’s known fish species. It covers 0.80% of the earth’s water and inhabit 0.009 % of its total water.

    85% of sea water contains salts like sodium and chlorine. The total gram weight of dissolved substances in one kg of seawater in called sailinity.These dissolved compounds effect species composition of particular marine habitats.

    1/3 of marine ecosystem is occupied by coastal habitats. Marine ecosystems like coral reefs provide shelter to most of the marine diversity in the world. The term coral refers to a number of animals like the soft corals, hard corals, whip corals, sea pens and organ pipe. Coral is known to exist since 200 million years in the marine ecosystems.

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