Marine animals

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Marine animals

Marine animals

They are also unified by their reliance on the marine environment for feeding. For example, dolphins and whales are completely dependent on the marine environment for all stages of their life; Marine animals feed in the ocean but breed on land; and polar bears must feed on land.

The term was coined by merging the name for the two orders, Cetacea and Artiodactyla, into a single word.

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Under this definition, the closest living land relative of the whales and dolphins is thought to be the hippopotamuses.

The first appearance of sirenians in the fossil record was during the early Eocene, and by the late Eocene, sirenians had significantly diversified. Inhabitants of rivers, estuaries, and nearshore marine waters, they were able to spread rapidly.

In comparison to cetaceans, sirenians, and pinnipeds, which entered the water approximately 50, 40, and 20 mya, respectively, the sea otter is a relative newcomer to marine life.

In some respects though, the sea otter is more fully adapted to water than pinnipeds, which must haul out on land or ice to give birth. Factors contributing to Marine animals trend include the increasing productivity of near-shore marine environments, and the role of endothermy in facilitating this transition.

This corresponds to the highest levels of primary production around North and South AmericaAfricaAsia and Australia. Total species range is highly variable for marine mammal species.

On average most marine mammals have ranges which are equivalent or smaller than one-fifth of the Indian Ocean. The high degree of overlap between marine mammal species richness and areas of human impact on the environment is of concern. Seals, however, also use a number of terrestrial habitats, both continental and island.

In temperate and tropical areas, they haul-out on to sandy and pebble beaches, rocky shoresshoalsmud flatstide pools and in sea caves.

Marine biology - Wikipedia

Some species also rest on man-made structures, like piersjettiesbuoys and oil platforms. Seals may move further inland and rest in sand dunes or vegetation, and may even climb cliffs. Annual ice contains areas of water that appear and disappear throughout the year as the weather changes, and seals migrate in response to these changes.

In turn, polar bears must follow their prey. In Hudson BayJames Bayand some other areas, the ice melts completely each summer an event often referred to as "ice-floe breakup"forcing polar bears to go onto land and wait through the months until the next freeze-up.

Marine - Wikipedia

In the Chukchi and Beaufort seas, polar bears retreat each summer to the ice further north that remains frozen year-round. Aquatic locomotion The anatomy of a dolphin showing its skeleton, major organs, and body shape Marine mammals have a number of physiological and anatomical features to overcome the unique challenges associated with aquatic living.

Some of these features are very species specific. Marine mammals have developed a number of features for efficient locomotion such as torpedo shaped bodies to reduce drag; modified limbs for propulsion and steering ; tail flukes and dorsal fins for propulsion and balance. Both pinnipeds and cetaceans have large and complex blood vessel systems which serve to store oxygen to support deep diving.

Other important reservoirs include musclesbloodand the spleen which all have the capacity to hold a high concentration of oxygen.

They are also capable of bradycardia reduced heart rateand vasoconstriction shunting most of the oxygen to vital organs such as the brain and heart to allow extended diving times and cope with oxygen deprivation. Sounds are generated by passing air from the bony nares through the phonic lips.

The focused beam is modulated by a large fatty organ known as the 'melon'. This acts like an acoustic lens because it is composed of lipids of differing densities.IMATA gives back by funding research and conservation.

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Marine Animals Oceans cover two thirds of our planet and they are teeming with marine animals. From fishes to sharks and whales to crabs and octopuses to microscopic algae, marine wildlife is highly diverse and contains the highest amount of life on Earth. Clearwater Marine Aquarium is home to many rescued and rehabilitating animals, including dolphins, sea turtles, otters and other marine life.

1. Issue a special permit or loan agreement to a person, firm, or corporation to possess a marine turtle species or hatchling, or parts thereof, including nests or eggs, for scientific, education, or exhibition purposes, or for conservation activities such as the relocation of nests, eggs, or marine turtles or hatchlings away from construction sites.

Most marine debris (80%) comes from trash and debris in urban runoff, i.e. land-based sources. Key components of land-based sources include litter, trash and debris from construction, ports and marinas, commercial and industrial facilities, and trash blown out of garbage containers, trucks, and landfills.

1 Ocean-based sources, such as, overboard discharges from ships and discarded fishing. A guide to fish and other ocean animals from the Monterey Bay Aquarium.

Marine animals
How the Warming of Our Oceans is Impacting Marine Animals - One Green PlanetOne Green Planet