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Sea Life

Sea Life. The sea:. The sea is the principal component, approximately 71% of the earth’s surface. The area of the World Ocean is 361 million square kilometres. Colour: A common misconception is that oceans are blue primarily because the sky is blue.

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Sea Life

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  1. Sea Life

  2. The sea: • The sea is the principal component, approximately 71% of the earth’s surface. • The area of the World Ocean is 361 million square kilometres. • Colour: A common misconception is that oceans are blue primarily because the sky is blue. • Only a 5% of the sea life has been investigated.

  3. Types of marines species; • Marine mammals • Crustaceans • Molluscs • Fish • Reptiles • Cephalopods • Echinoderms

  4. Marine mammals • In the World there are 4.000 species of mammals, including “men”. In this group one part of mammals are marines. • They appeared in the world 66 millions years ago. • There are three types of marine mammals:

  5. Sirenios: They are herbivores • Manatí: • They feed from the river plants and from the marine bed • They live in sweet and salty water and near America or Africa. • Their bodies measure between 3 and 4,5 m. and weight between 300 and 500 kg • Dudongo: It is the smallest sirenio, • They feed from the coastal zones and eat only seaweeds • They only live in salty water • Their bodies measures3 m. and weight 200 kg

  6. Sea elephant Baby seal walrus Pinnípedos: • In this group there are 33 types of seals, marine lions, marine bears, elephant seals and walruses. • They are carnivorous • They are of elongated body, short legs, hands and feet clapped in the shape of fin. • They eat fish, molluscs and crustaceans • The biggest one is the elephant seal, they can manage to measure 7 m. • They live in cold and moderate waters of both hemispheres

  7. Cetaceans: • They are whales, cachalots, zifios, dolphins, killer whales and porpoises. • Many species have been hunted even almost to become extincted. • They breathe air with their lungs, they have warm blood, they suckle their babies and have hair. The cetacean ones are the mammals better adapted to the aquatic life. Diet: • Cetacean with teeth (Belugas, cachalot, dolphins and porpoises): They have many teeth for hunting fish, squid and other animals • Cetacean with beards (whales): In his place they have plates that act as giant filter, capturing small animals (fish, krill and plankton).

  8. Crustaceans • The crustaceans are an extensive sub edge of arthropods. • There exist crustaceans of salty water, of sweet water and, even, terrestrial. • The crustaceans are fundamentally aquatic and live in all depths, either in the marine environment or sweet water. • They eat plankton: set of organisms mainly microscopic, which float in salty or sweet waters.

  9. Characteristics of crustaceans: • They have a shell or hard crust that protects them. • Their legs are articulated. • They must change to grow. • Are aquatic and breathe through gills. • Some crustaceans are almost in extinction for example: • Carrucho, Juey, Lobster and prawn

  10. Fish • Fish are aquatic vertebrate animals that are typically ectodermic covered with scales. • Fish are abundant in the sea and in fresh water, with species being known from mountain streamsas well as in the deepest depths of the ocean. • Fish eat many types of insects and other fish

  11. Fish They range from freshwater to marine ecosystems , even in habitats with high degradation including: • water pollution. • the building of dam. • removal of water use by humans. • the introduction of exotic species.

  12. Fish extinction danger • Steel-head trout: It is a rainbow trout that spends part of his cycle of life in the sea. • Giantcatfish : It is one of the bigger fish of sweet water of the world, managing to measure up to 3 m. • Chinook salmon: iiis a fish of 46 kg and 3 metres long.

  13. Molluscs • They have a soft body and without forming rings. • Can have shells with one or two valves produced by the mantle. • Move themselves through a muscular foot of diverse forms. • Breathe through gills. • Are oviparous.

  14. Cephalopods • Ii is a type of molluscs: • They have not got external shell. • Some of them, as the squid, take a bag of ink to muddy the water in case of danger. • Have long tentacles in their heads. • Are marine and breathe through gills.

  15. Marine reptiles • Thereisonlyone marine reptile: sea turtle. • They are omnivorous. • Sea turtles eat corals, which provide them calcium, aquatic vegetation, algae, and when eating meat they choose between small invertebrates such as octopus or jellyfish. • Turtles migrate constantly through the areas of food and reproduction.

  16. Violet team: • María Duarte • Carlos Cano • Sara García • Mario Causapié • José Gandía • Alberto Royo

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