It is the only species of cetacean with heterodont dentition, and its dorsal fin is so small that it rather looks like a triangular crest. Distinctive characteristic. Amazon River dolphins have been known to approach canoes, grabbing hold of fishermen’s paddles with their beaks and making off with their prize. Livraison accélérée gratuite sur des millions d’articles, et bien plus. In addition, the animal can be easily identified by having a ridge on its back instead of a dorsal fin. Their principal anthropogenic threats are: – Overfishing. It is also very playful, and it has been seen pulling the aquatic grass and throwing pieces of wood. River dolphins are among the most seriously threatened dolphins in the world. Quite the charmers, male botos sometimes try and win over females by pulling some particularly alluring techniques out of the bag. This water mammal is the largest of all the other river dolphin species, and cannot survive in salt water. In the past, botos were spared from hunting and persecution because they were believed to be magical. It is, therefore, a lone dolphin. The boto is an ‘encantado’ – an enchanted shapeshifter living as a river dolphin by day and morphing into a handsome young man at night. When a male finds a receptive female, he communicates his mating intentions by biting the female’s flippers. Its speed while swimming is only 1.5 to 3.2 kilometers per hour, but it has occasional bursts reaching up to 14 to 22 kilometers per hour. Vous écoutez un extrait de l'édition audio Audible. The Amazon river dolphin has occasionally been seen hunting cooperatively with other species, including the distantly-related tuxuti (Sotalia fluviatilis) and the giant otter (Pteronura brasiliensis).
It may live up to 30 years, and the males are usually 16 percent longer and 55 percent heavier than females. Mature males are pinker than females, which could be to do with their penchant for fighting. River dolphins are rather small, ranging in size from the 5-foot (1.5 m) long South Asian river dolphin to the 8-foot (2.4 m) and 220-pound (100 kg) Amazon river dolphin. Of all the remarkable species that inhabit the Amazon river basin, few are as iconic or as threatened as Amazon river dolphins. It is a natural hunter. The “clicks” are the basis of their communication and reach from 16 to 170 kilohertz. Noté /5: Achetez Amazon River Dolphin de Russell Jesse: ISBN: 9785512761731 sur amazon.fr, des millions de livres livrés chez vous en 1 jour Protecting areas in nature that river dolphins need to survive is challenging but essential for their future survival. Merci d’essayer à nouveau. Après avoir consulté un produit, regardez ici pour revenir simplement sur les pages qui vous intéressent. Together we can: Establish fresh water protected areas - identify and establish meaningful protection for important fresh water habitat areas for river dolphins. Impossible d'ajouter l'article à votre liste. Amazon river dolphin facts, pictures and information. It is not as sociable as the oceanic dolphins since it usually travels in groups of 2 or 3 individuals, mostly mothers with a calf. When the rainy season arrives, they will also swim in smaller creeks, floodplains, and even into flooded forests. Page 26. By supporting WDC, you can help botos to live safe and free.
The most distinctive feature of this dolphin is the pink color that it acquires with age.
Support grass roots conservation efforts in Colombia, Peru and Bolivia. See all species. * Recently (2014) this subspecies was split from Inia geoffrensis and defined as an independent species with the name Araguaian River dolphin as mitochondrial studies determined that they are indeed different species. It is a robust dolphin with a very long snout easily distinguishable. Sometimes it associates with the giant otter (Pteronura brasiliensis) or the tucuxi (Sotalia fluviatilis) to hunt in a coordinated way and share the food.
There are three subspecies of Amazon river dolphin: Amazon River Dolphin Reproduction. The body of this mammal is long and plump, whereas the fins remind paddles by their shape. Weight and size. Support WDC by shopping for yourself or a friend.
Sélectionnez la section dans laquelle vous souhaitez faire votre recherche. It has a bulbous forehead due to a pronounced melon, chubby cheeks, small eyes and a remarkably flexible neck since its vertebrae are not fused. Also known as the ‘Pink River Dolphin’ or the ‘Boto’, they are not to be confused with the marine pink dolphins. Living in huge rivers, small tributaries, lakes, flooded forests and submerged grasslands, botos can be found in six countries: Bolivia, Brazil, Colombia, Ecuador, Peru and Venezuela. They can also throw sticks and weed, pull grass underwater and play with turtles, snakes and fish. – Inia geoffrensis humboldtiana. They can be found in rivers (of course), but also river basins, canals, lakes, tributaries, and the ends of rapids and waterfalls. The diet of these dolphins includes 43 species of fish. Amazon River dolphins, popularly called ‘botos,’ are freshwater dolphins living in the rainforest rivers of South America. Academic Press, 2009. Un problème s'est produit lors du chargement de ce menu pour le moment. * Désolé, un problème s'est produit lors de l'enregistrement de vos préférences en matière de cookies.
The increasing contamination of the river brings all kind of problems to these dolphins and reduces their chances to survival drastically. – Dam construction. Usually found alone, in mother-calf pairs or in small pods of 3 or 4 individuals, botos are rarely found in large groups. They are also the most intelligent of the five living species of river dolphins. Aided by their unfused neck vertebrae, they can get a good look at their underwater worlds by turning their heads in all directions and checking things out from every angle. Les membres Amazon Prime profitent de la livraison accélérée gratuite sur des millions d’articles, d’un accès à des milliers de films et séries sur Prime Video, et de nombreux autres avantages. Quite simply, botos do not have anywhere else to go. Amazon river dolphins live in a number of freshwater habitats across the Amazon River Basin. It is found throughout much of the Amazon and Orinoco river basins in Bolivia, Brazil, Colombia, Ecuador, Guyana, Peru, and Venezuela. Des tiers approuvés ont également recours à ces outils dans le cadre de notre affichage d’annonces. Whales, Dolphins, and Porpoises: A Natural History and Species Guide. The development of hydroelectric dams in the river, alter the conditions of their habitat separating populations which reduce the availability of mating partners and the genetic diversity. William F. Perrin, Bernd WÃ¼rsig, J.G.M. After mating, it is approximately 11 months later when the calf will arrive. 11 months after mating, a single offspring is born between May and July measuring about 0.8 meters long. As humans continue to transform rivers to serve their own needs and pollute waters, the future for river dolphins is looking particularly bleak.
It is a relatively abundant freshwater cetacean with an estimated population in the tens of thousands. Helping them to hunt and feed, Amazon River dolphins have lithe, manoeuvrable bodies. Together, we can: Adopt a whale and help us protect these amazing creatures. The fact that the pink dolphin has a “Data Deficient” conservation status on the Red List of the International Union for the Conservation of Nature entails a danger not completely unknown, but that makes difficult to implement conservation strategies. Encyclopedia of Marine Mammals. It uses echolocation to perceive what is in its environment and capture prey. Amazon River Dolphin Interesting Facts. Interestingly, Amazon River dolphins are the only dolphins who have the equivalent of molar teeth, much like we do. An Amazon river dolphin, also called a boto, pauses for an underwater portrait in Brazil. Family: Iniidae Its distribution includes the basins of the Amazon and Orinoco rivers and the tributaries of these rivers in Bolivia, Colombia, Brazil, Ecuador, Peru, and Venezuela. Since the mid-1990s, thousands of botos have been hunted to provide bait to catch meat-eating fish called mota or piracatinga or caught in fishing nets. Once transformed, the encantado leaves the river to attend parties and seduce young girls. WDC is working at international, national and local levels to establish Protected Areas which can be managed for river dolphin conservation. Chelsea Green Publishing, 2009. http://www.iucnredlist.org/details/10831/0, Designed by Elegant Themes | Powered by WordPress. The Amazon pink dolphin consumes a variety of prey more diverse than other species of dolphins. Il analyse également les commentaires pour vérifier leur fiabilité. Males are ready for mating around 7 to 12 years old. ‘Hans’ Thewissen.
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