Practical 3 - Presentation

8/3/2019 Practical 3 - Presentation

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DOLPHIN


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Behinds the dolphins smiles..

In a few countries, the dolphins are controlled

from being exploitation by human.

Based on statistic, data shows that at least

2700 dolphins are caught from their habitat. About 53% dolphins are died in 90 days

because suffer at the new place.

A study shows that dolphin cannot adapt tolive in the small cage because real life of

dolphin is living freedom in the ocean.


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Hector's dolphin

Cephalorhynchus hectori

Kingdom:Animalia

Phylum:Chordata

Class:Mammalia

Subclass:Eutheria

Order:Cetacea

Suborder:Odontoceti

Family:Delphinidae

Genus:Cephalorhynchus

Species: C. hectori


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Bottlenose dolphin

Tursiops truncatus

Kingdom:AnimaliaPhylum:Chordata

Class:Mammalia

Order:CetaceaFamily:Delphinidae

Genus:Tursiops

Species: Tursiopstruncatus


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Hector's dolphin...

Hectors dolphins are endangered.

Hector's dolphins are falling victim to fishingnets, collisions with boats and pollution.

Dead dolphins had been found washedashore with injuries that indicated they haddrowned in nets.

Recent research at Auckland and

OtagoUniversity has shown that thepopulation may consist of fewer than 100animals, as a result of entanglement ofdolphins in gillnets used by fishers.


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There is a possibility that populations havedeclined to about a third to half of their size

since 1970 because of gill net entanglement, withbycatch of this species occurring throughout itscurrent range.

Human-made chemicals such as PCBs, DDTs and

dioxins accumulate inH

ector's dolphins whichcould potentially affect reproductive rates.

Habitat modification is another potential threatfor the future. Although marine areas in NewZealand are relatively immune to degradation,coastal development such as the construction ofports and aquaculture are developing rapidly insome areas. Several deaths caused by shipstrikes have been reported.


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Bottlenose dolphin...

Bottlenose dolphins are not endangered.

Their future is stable because of their abundance

and adaptability.

However, specific populations are threatened dueto various environmental changes.

The population in the Moray Firth in Scotland is

estimated to consist of around 150 animals and isdeclining by around 6% per year from harassment,

traumatic injury, water pollution and reduction in

food availability


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Less local climate change, such as increasingwater temperature may also play a role.

In U.S. waters, hunting and harassing of

marine mammals is forbidden in almost all

circumstances. International trade in dolphinsis also tightly controlled.


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Dolphins may suffer from viral, bacterial, andfungal infections. In addition, they may developstomach ulcers, skin diseases, tumors, heartdisease, urogenital disorders, and respiratorydisorders.

In 1987 and 1988, over 700 bottlenose dolphinswashed up dead on the east coast of the UnitedStates. Scientists originally believed that thedolphin deaths were triggered by a naturally

occurring "red tide" combined with bacterial andviral infections. Recent tissue analysis indicatedthat morbillivirus may have been a majorcontributing factor in most of the mortalities.


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Human activities

Hunting.

Pollution.

Development along coastlines. Fishing nets.

Heavy boats traffic.

Habitat destructions.


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Causes


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LANDING

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Practical 3 - Presentation

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