By Dana Desonie
Earth's seas play a major position within the planet's structures: Ocean currents move water and warmth all over the world, and ocean ecosystems are one of the so much biologically efficient wherever. however the oceans are being abused. Wild fisheries are harvested to the purpose of cave in, and a few aquaculture damages lifestyles and the surroundings. humans deliberately or inadvertently unload wastes - sewage, oil, poisonous chemical substances, detergents, fertilizers, and invasive species - and all affect ocean ecosystems. delivering full-color pictures and illustrations and pleasing textual content, "Oceans" introduces younger technology scholars to those pressing concerns. this significant new paintings indicates how holding the oceans calls for maintaining the full planet, and describes the significance of atmosphere apart marine reserves to save lots of very important ecosystems.
Read Online or Download Oceans: How We Use the Seas (Our Fragile Planet) PDF
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Additional resources for Oceans: How We Use the Seas (Our Fragile Planet)
Sample text
Both Works) animals are enormous, up to 9 feet (3 m) in length and weighing up to 1,900 pounds (860 kg). Manatees and dugongs are gentle animals that may live to be 50 to 80 years of age. They produce few offspring over their lives. Manatees are soli- tary, but dugongs can live in herds of 100 to 200 animals. The roughly 2,500 Florida manatees (a subspecies of the West Indian species Trichechus manatus) that live in the United States winter in Florida but may migrate along the Gulf Coast or Atlantic Coast in summer.
Diving birds exhale all the air from their lungs and air sacs, shape themselves like torpedoes, and plummet into the sea to catch fish. ) fly with their lower bill in the water and capture anything they encounter. ) steal food from other seabirds. Shorebirds are migratory and may be present in groups of up to hundreds of thousands at certain times of the year. Each species of shorebird eats a different type of food depending on the length of its neck, bill, and legs. Herons and egrets, with long legs and necks, wade into deep water and strike at small fish.
41 42 oceans Benthic plants and animals are found on the seafloor or in its sediments. The wide range of habitats in and on the sediments has led to the evolution of 150,000 species of benthic animals. All are invertebrates—creatures that do not have backbones. Invertebrates are soft-bodied but may have a hard outer covering, like a shell, for protection. Benthic animals include epifauna that live on the sea bot- tom and infauna that live buried in soft sediments or that bore into the rocky bottom.
