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La biodiversité marine

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(soit environ environ 361 millions de kilomètres carrés)

L'océan recouvre 70,8% de la surface de la terre

35g/L de sel

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3800 m

profondeur moyenne:

Les océans abritent près de 250 000 espèces, mais nous n'avons exploré que 5% des profondeurs, il y a environ 80% des fonds marins non visités.

Peuvent être plats, ronds, annelés (bouclés), lisses, etc...

Comprend les escargots, limaces,nudibranches, moules, pieuvres, calmars.

Constitués d'un corps mou et d'une "enveloppe" plus ou moins dure (= squelette externe)

3 grandes espèces

Crustacés

(environ 31.000 espèces)

Mollusques

(environ 25.000 espèces)

Vers Annélides

(environ 5.500 espèces)

  • dauphin
  • marsouin
  • orque
  • phoque
  • cachalot
  • baleine
  • et bien plus...
le requin n'est pas un mammifère marin, mais un poisson !

Il existe aussi des mammifères marins :

Bien sûr, il existe plusieurs espèces de chaque mammifère marin !

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Les tortues font donc partie de la famille des reptiles. Elles possèdent une carapace pouvant faire le double de leur poids!

Et plus ! (rivières, lacs...)
* Île en forme d'anneau constituée de récifs coralliens
* zone de mélange des eaux douces et marines

Différents milieux marins (écosystèmes)

Estuaires*

Récifs coralliens

Marais salés

Mangroves

Estrans rocheux

Atolls*

Plages

Mers

Prairies sous-marines

Océans

On a (je crois) tout dit sur la biodiversité marine...MAIS avez-vous bien compris ?

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Nous avons (ENFIN) terminé ! Merci.

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