Les animaux marins ( en voie de disparition )
Comme tout le monde le sais, certaines espèces marines sont menacées principalement par la pollution qui entraine le réchauffement climatique
I/Les causes de la disparition
A/La chasse
Les baleines sont les principales victimes de la chasse, car elles sont recherchées pour leur chair. Aujourd‘hui, des traités internationaux limitent de façon très stricte la chasse à la baleine.
Mais certains pays continuent la pêche à la baleine sous une condition : Que cette espèce de baleine ne soit pas menacée.
B/Les activités humaines
Les animaux marins sont pris dans des filets de pêches ou dans des hélices de bateau de croisières .La construction d’hôtel en bort de mer peut déranger l’habitat des animaux marins.
C/La captivité
Par contre certains cétacés sont capturés pour être dompté puis exposés dans des centres aquatiques. Ces animaux vivent mal car la captivité, pour eux c’est comme un enlèvement car beaucoup d’entre eux, ont un rôle dans leur bande. Ainsi si on enlève un membre d’un groupe cela bouleverse tout.
Pour les cétacés la capture est un exercice violent. Certain d’entre eux comme les dauphins se noient à cause du stresse. Plus de la moitié des dauphins meurent durant les deux premières années de captivité, l’espérance de vie d’un grand dauphin en captivité est de 20 ans au maximum, aux contraire d’un grand dauphin en liberté qui accède facilement les 45 ans tandis que pour une femelle libre elle atteint facilement les 55 ans.
D/La pollution industrielle
La pollution est plus visible et plus connue, elle est causée par des accidents de navire pétroliers ce qui entraînent les marées noires qui sont de plus en plus visibles .De nombreux bateaux viennent vidée leur déchets dans la mer.
E/Les changements climatiques
Le réchauffement climatique est causé par la pollution. Le réchauffement climatique hausse la température des océans et modifie les courants océaniques. Les animaux marins ne peuvent pas vivre dans de nouvelle conditions.
II/Les principales victimes
A/Le Dugong
Les populations de dugong ( vaches marines ) déclinent dangereusement .Le dugong, ce gros mammifère marin de 500 kg, à la silhouette lourde, est obligé de venir à la surface de l’eau toute les 1 à 4 minutes. Il est victime de la pêche, de la pollution des eaux et des accidents. A cause de certaines croyances hygiènes dans certains pays, le Dugong est tué pour ces vertus magique. Les défenses de Dugong mâles servent à confectionner des colliers ou des fûmes cigarette. A ce jour il ne reste que 70.000 Dugongs. Sur les côtes Africaines, autrefois on pouvait les observés par troupeaux de plusieurs centaines de bêtes, on ne les voit plus maintenant que par dizaines ou même par fois seul.
B/Le Phoque moine
Il fait partie des 6 espèces de mammifères marins les plus menacés au monde. Les phoques sont menacés par la pollution, elle les rend malade et les affaiblie. A cause des pêches il n’a plus assez de nourritures, il est aussi tuer car on l’accuse de manger trop de poisson, ils se font prendre dans des filets que les pêcheurs ont laissé. Il n’en reste environ 500 sur terre.
C/La Baleine Bleue
La pêche a anéantit la population de Baleine bleue, à cause de la surpêche à la baleine. Il en restait encore 200.000 en 1950 tandis qu’en 1980 il n’en restait que 2.000. L’interdiction de sa chasse et la création récente d’un sanctuaire devrai permettre à l’ espèce de se reproduire.
D/Le Beluga
Le béluga est une espèce vulnérable. Il en reste 60.000 à 80.000 bélugas sur la terre. Ils sont menacés par la pollution de la mer par les produits toxiques, cela les rend malades.
E/L’esturgeon
L’esturgeon a disparu des côtes d’Europe occidentale, sauf en France ou il est quand même devenu très rare. Plus de 4.000 captures en 1947 et 10 en 1980. Il est regrettable de tuer la femelle pour en extraire les œufs, car cette manière de procéder entraîne la suspension des reproducteurs indispensable à la source de l’espèce. Ces animaux sont menacés par la pollution, les dragages, les barrages et la pêche de sujet trop jeunes .Toutes c’est conditions font que l’esturgeon se raréfie dangereusement et risque même de s’éteindre dans un avenir prochain.
F/L’hippocampe
L’hippocampe appeler cheval des mers est menacé. 20 millions d’entre eux sont pêché chaque année. Ils sont aussi vendu vivant comme poisson d’aquarium et on s’en sert comme bibelot ou sécher dans des pendentifs.
Conclusion
Si on ne fait rien pour protéger les océans, certaines espèces marines n’existerons plus d’ici peu.
J’aime les animaux et la nature, nous devons les protéger!
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