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Daksh Blue Whale

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    • 1. BLUE WHALES By: Daksh Juneja Wednesday, March 18, 2009
    • 2. INTRODUCTION TO WHALES The Blue Whale is a marine mammal belonging to the suborder of • baleen (no teeth) whales . At up to 32.9 metres in length and 190 tonnes or more in weight, it is the largest whale and the largest living animal and is believed to be the largest animal ever to have existed. Long and slender, the Blue Whale's body can be various shades of bluish-grey and a lighter colour underneath • the body .There are at least three distinct subspecies: B. m. musculus of the north Atlantic and north Pacific, B. m. intermedia, of the Southern Ocean and B. m. brevicauda (also known as the Pygmy Blue Whale) found in the Indian Ocean and South Pacific Ocean. B. m. indica, found in the Indian Ocean, may be another subspecies. As with other baleen whales, its diet consists almost exclusively of small crustaceans known as krill • Wednesday, March 18, 2009
    • 3. INTRODUCTION TO WHALES CONTINUED Blue Whales were abundant in nearly all the oceans until the beginning of the twentieth century. For • over 40 years they were hunted almost to extinction by whalers until protected by the international community in 1966. A 2002 report estimated there were 5,000 to 12,000 Blue Whales worldwide located in at least five groups. More recent research into the Pygmy subspecies suggests this may be an underestimate. Before whaling the largest population was in the Antarctic, numbering approximately 239,000 (range 202,000 to 311,000). There remain only much smaller (around 2,000) concentrations in each of the North-East Pacific, Antarctic, and Indian Ocean groups. There are two more groups in the North Atlantic and at least two in the Southern Hemisphere. • Wednesday, March 18, 2009
    • 4. SOCIAL STRUCTURE Blue whales mostly travel alone or in groups of 2-3. Larger groups of up • to 60 whales have been reported and are probably associated with feeding grounds. However, the blue whale has the most powerful and deepest voice in the animal kingdom, and its low-frequency sounds can travel in deep water over hundreds, or even thousands, of miles. Under these circumstances, animals which may appear to us to be traveling alone may actually be in constant contact with one another • Wednesday, March 18, 2009
    • 5. GROWTH / LIFE STYLE Growth: Most young blue whales grow 0.3 metres, 90 Kilograms Per Day • Life Cycle: At birth, a blue whale calf is the largest baby on earth: approximately 8 m long and weighing about 4 tons. They grow at a rate of 90 kg and one inch per day this growth rate is astonishing, and is probably the fastest in the animal kingdom. From conception to weaning, it represents an increase in tissue of several billion-fold in little more than a year and a half.Like other baleen whales, the blue whale has no teeth so it is difficult to tell its age (teeth can be used to estimate age in other mammals). However, scientists believe they live until they are at least 50. Wednesday, March 18, 2009
    • 6. HABITAT The blue whale is found mostly in cold and temperate waters, and it • prefers deeper ocean waters to coastal waters. Like many other baleen whales, it feeds in cool waters at high latitudes, and generally migrates to warmer temperate and tropical waters to breed and give birth, although in some areas it appears that the species may be resident year-round. • Wednesday, March 18, 2009
    • 7. BREEDING Usually one calf is born, every 2 - 3 years. Recent evidence • suggests however that the inter-breeding interval is shorter than before whaling occurred, possibly to increase the growth rate of the populations • Wednesday, March 18, 2009
    • 8. DIET During the summer feeding period, a blue whale eats about 40 million krill each day, • amounting to about 3,600 kg. It expands its throat plates and takes in water with krill, then pushes out the water through the baleen plates, and swallows the krill that has stayed inside the mouth. • Wednesday, March 18, 2009
    • 9. ADAPTIVE FEATURE A whale's quot;nostrilsquot; are called blowholes and are on the top of its head. Some • whales have one blowhole and others have two. Unlike humans, whales breathe voluntarily. That means they choose when to take a breath. This is important because whales can't breathe underwater. They surface every few minutes to blow out a mixture of water and air and take in a breath of fresh air • Wednesday, March 18, 2009
    • 10. PICS & MULTIMEDIA Wednesday, March 18, 2009
    • 11. PICS & MULTIMEDIA Wednesday, March 18, 2009
    • 12. PICS AND MULTIMEDIA Wednesday, March 18, 2009
    • 13. PICS & MULTIMEDIA Wednesday, March 18, 2009
    • 14. PICS & MULTIMEDIA Blue Whale Call (Atlantic) Wednesday, March 18, 2009
    • 15. PICS & MULTIMEDIA Pacific Call Wednesday, March 18, 2009
    • 16. PICS & MULTIMEDIA South Pacific Call Wednesday, March 18, 2009
    • 17. THE END Wednesday, March 18, 2009