Wednesday, 9 November 2016

Differences between seals and sea lions

Ocean lions are altogether different from seals despite the fact that their appearance is fundamentally the same as the stripped eye. In the first place, ocean lions have two little external ears, while seals have no sound-related shade. The other enormous contrast lies in the back folds. Ocean lions can twist their back folds, this permits them to stroll without laying their stomach on the ground. The seals, then again, slither on the ground to move. The ocean lion, along these lines, is a creature considerably more spry and adaptable than the seal. He is fit for turning, hopping, bending his entire neck until he touches his back or remains on the back flippers.


Ocean lions have their bodies secured with hair to separate themselves from the icy inside the water. Be that as it may, on the off chance that it is excessively hot, you can evacuate both the pectoral and back blades out of the water to keep up an appropriate temperature. The hide transforms it twice per year and they help themselves from the three nails they have on the rear blades to change it. Since they need to chase inside the water, they have a decent view. During the evening, be that as it may, they utilize the stubbles to get the vibrations of the fish.

The distinction between male ocean lions and females is extremely discernible, this is logically called sexual dimorphism. The male can weigh around 150 kg more than the females. They additionally have a more created mouth and a more greasy and beefy neck to protect against the nibbles of alternate guys in the battles for females. Concerning the sexual dimorphism of seals, I suggest you visit the entrance focaswiki.com, a site gaining practical experience in these staggering oceanic creatures where you can discover a great deal of data.

This is the thing that the ocean lion coaches enlighten us concerning in the instructive session that they give some days at 12:30 in Aquarama. Parental figures prepare creatures through a reward framework. Each time they do it right, they are sustained. Furthermore, they utilize voice and hand signals for ocean lions to perceive the activities. They are prepared from an early age, when they start to ingest fish and take about a year to be superbly prepared.





Marine mammals are a diverse group of approximately 130 species of mammals that have adapted to life in the sea or depend on it for feeding. The term marine mammal does not designate an accurate taxonomic set. This group includes cetaceans (whales, dolphins and porpoises), sirenians (manatees and dugongs), pinnipedos (true seals, otarios and walruses) and some otters (sea otter and sea cat). Polar bear, although not an aquatic animal, is also usually grouped with marine mammals because it lives in sea ice for most or most of the year and its high degree of adaptation to life at sea.

Marine mammals acquired different traits to adapt to life at sea, such as a generally larger size, hydrodynamic body shape, modified appendages and experienced thermoregulatory adaptations. The different species, however, adapted to sea life in varying degrees. The most adapted are cetaceans and sirenians, whose life cycle runs entirely in the water, while the other groups spend at least some time on land.Although marine mammals are a charismatic megafauna and supported by environmental groups, many populations are vulnerable or endangered because of a long history of commercial exploitation of oil, meat, ivory, and skin . Most marine mammal species are protected from commercial exploitation.


Sirenians and cetaceans are thought to descend from an ungulate ancestor, while pinnipeds, otters, and polar bear come from a caniform ancestor. The morphological similarities between these diverse groups are the result of convergent and parallel evolutions.

Several groups of marine mammals of the past no longer exist today. In addition to the ancestors of present whales or seals, there were the Desmostylia, distant relatives of the manatees or the Kolponomos, a genus of clams-eating sea bears, but not directly related to the modern polar bear.
 



Adaptaciones

 

To develop their life at sea, marine mammals have developed important adaptations that resemble other marine animals. However there are big differences: 

  • Marine mammals breathe air, while most other marine animals draw oxygen from water.
  • Marine mammals have hair. Cetaceans have little to no hair, usually very few bristles retained around the head or mouth. All members of the order Carnivora have a coat of fur or hair, but it is much thicker and more important for thermoregulation in sea otters and polar bears than in pinnipeds. They do not have thick layers of hair because it would decrease their swimming capacity and the speed of movement in the water.
  • Marine mammals have a thick layer of fat to isolate their bodies and prevent heat loss. Sea otters and polar bears are exceptions and rely more on their skin and behavior to prevent hypothermia.
  • Marine mammals are viviparous. Most have a calf at each birth.
  • Marine mammals feed on milk in their infancy. Maternal care is very important for the survival of offspring, which has to develop a thick layer of fat insulation. Milk from body fat in offspring.
  • Marine mammals maintain high internal body temperature. Unlike most other oceanic animals, marine mammals maintain an internal temperature much higher than ambient temperature. The fat, the thick layer of skin, the air bubbles between skin and water, are adaptations that help these animals in retaining body heat.
  • Since the mammals originally developed on land, their spine is optimized for walking, so it moves with play from top to bottom but has less lateral mobility. Because of this, marine mammals usually swim by moving their spine up and down. Conversely, fish usually swim by moving their spine laterally. For this reason, the fish usually have their vertical caudal fin, while the marine mammals have it horizontal.
  • Marine mammals that live exclusively in the sea (such as cetaceans) had to undergo important adaptations in their sleep habits in order to be able to sleep without drowning. From studies of bottlenose dolphins in aquariums and zoos and also with whales and dolphins released, it follows that they developed two methods of sleep: either they remain static at two levels (vertically or horizontally) or swim while sleeping in a similar state the nap.

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