IAV Hassan II :: Association marocaine des etudiants veterinaires AMEVet [Rabat-Maroc]

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IAV Hassan II :: Association marocaine des etudiants veterinaires AMEVet [Rabat-Maroc]: Autres sujets

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antartica animals

ezzahra.l writes "Antarctica, the frozen continent surrounding the Earth's South Pole, and the frigid seas surrounding it, are home to many animals. In particular, the Antarctic seas are teeming with life, ranging from microscopic plankton to the biggest animal that ever lived on Earth, the Blue whale.
Antarctica is the coldest, windiest, and driest place on Earth. The coldest temperature ever recorded on Earth was in Antarctica; it went down to approximately -129°F (-89°C)! The Antarctic land does not support many life forms. Most of the land of Antarctica is a frozen desert, with less precipitation than the Sahara Desert (under 2 inches = 5 cm a year). Oddly enough, 70% of the world's fresh water is frozen in the region of the South Pole.
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Posted by xshadow on Vendredi, octobre 03 @ 21:12:59 CEST (252 reads) (Read More... | 1564 bytes more | Score: 0)

Eco-behavioural adaptations of camels

ezzahra.l writes "The ability of camel to withstand long periods without water is due to a series of physiological adaptations. Their red blood cells have an oval shape, unlike those of other mammals, which are circular. This is to facilitate their flow in a dehydrated state. These cells are also more stable in order to withstand high osmotic variation without rupturing when drinking large amounts of water.
Camels are able to withstand changes in body temperature and water content that would kill most other animals. Their temperature ranges from 34 °C (93 °F) at night up to 41 °C (106 °F) during the day, and only above this threshold will they begin to sweat. The upper body temperature range is often not reached during the day in milder climatic conditions, and therefore, the camel may not sweat at all during the day. Evaporation of their sweat takes place at the skin level, not at the surface of their coat, thereby being very efficient at cooling the body compared to the amount of water lost through sweating. This ability to fluctuate body temperature and the efficiency of their sweating allows them to preserve about five litres of water a day.
Camels eating green herbage can ingest sufficient moisture in milder conditions to maintain their bodies' hydrated state without the need for drinking.
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Posted by xshadow on Vendredi, octobre 03 @ 21:11:56 CEST (262 reads) (Read More... | 2543 bytes more | Score: 0)

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