Презентация, доклад по английскому языку на тему The flora and fauna of the Black Sea

why it is that all of us are so committed to the sea, except I think it's because in addition to the fact that the sea changes, and the light changes, and ships change, it's because we all came from the sea. And it is an interesting biological fact that all of us have in our veins the exact same percentage of salt in our blood that exists in the ocean, and, therefore, we have salt in our blood, in our sweat, in our tears. We are tied to the ocean. And when we go back to the sea - whether it is to sail or to watch it - we are going back from whence we came.
― John F. Kennedy

one of the most remarkable places on Earth. Often called the "world in miniature" or "open air museum".

the Crimea are characterized by relatively high levels of diversity.

Indeed, on an area of about 27 000 sq. km. Modern scientists have identified three macro-region and 20 climatic subregions.

most of its other unusual properties: in this almost closed, separated from the Ocean Sea, flows into a plurality of large rivers.

Rivers bring fresh water, but much of it evaporates from the surface of the sea. So - Black Sea is salty: the salinity of the surface - up to 100 meters deep - layer Black Sea water is 17 ‰ , two times lower than the ocean 35 ‰.

the decline of biodiversity of the Black Sea, as the salinity of 17 ‰ is too small for most marine organisms. The inhabitants of the seas and oceans can not tolerate salinity less than 20 ‰, so the underwater world of the Black Sea is relatively little diversified.

only 13% of water. Exactly in the oxygen layer inhabit several hundred planktonic and benthic algae and over 2,500 animal species.

Among the main reasons for the relative poverty of the animal world of the sea are:
• a wide range of salinity
• moderately cold water
• presence of hydrogen sulfide at great depths

distinctive. The class of fish, including about 20 000 species, divided into two sharply separate branches - cartilaginous and bony fish.

Many of them (several species of herring, almost all osetrvye fish, etc..) are semi-anadromous species and some species fully adapted to marine life conditions.