Download People And The Sea (Life in the Sea) by Pam Walker PDF

By Pam Walker

It is just average for individuals to be fascinated about the ocean. lifestyles originated within the oceans, and greater than one-half of the folks in the world stay inside 50 miles of the ocean. in spite of the fact that, even if we've got despatched explorers to the moon and different areas of area, we nonetheless be aware of little in regards to the frontier that surrounds us. The attractive new "Life within the Sea" set presents younger readers with present, obtainable information regarding the ocean and its creatures. This finished source at the ocean's population offers residing issues of their actual habitats, emphasizing the connection among marine biology and marine ecology. every one quantity specializes in one particular sector of the marine international, discussing its actual features, the dwelling issues stumbled on there, and the impression people have at the region. the correct significant other to "Facts On File's lifestyles on the earth" set (see dealing with page), this helpful reference offers a well-rounded view of marine lifestyles.

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In several states, including New York, Massachusetts, and Rhode Island, manufacturers are required by law to make six-pack rings of biodegradable plastic. Photodegradable plastic is similar, but it becomes weak and falls apart when exposed to light. In both types of biodegradable material, plastic pieces still enter the water. However, they are not large enough to strangle or choke animals. Oil, Trash, and Toxic Marine Pollution Toxic Pollutants Other materials that enter the ocean from land-based activities include pesticides, heavy metals, and radioactive wastes.

Several types of bait can be placed on the hooks, including live fish, pieces of dead fish, and artificial lures. Some fishermen also ladle chum, ground-up oily fish, into the water to attract fish to the area. Migratory fish who are top predators in the food chain, like swordfish, tuna, shark, billfish, and halibut, are some of the targets of these longline fishermen. Longlines are strung out in zones where the targeted species are known to frequent, such as the region that extends from the northern coast of South America, through the Caribbean and Gulf of Mexico, and up along the coast of central North America.

From the 1930s Fig. 2 During the 1950s, mercury compounds discharged into Minamata Bay, Japan, were consumed by plankton. Fish ate the plankton, and mammals such as cats and humans consumed the fish, passing the mercury up the food chain. Cats were the first organisms to display severe nervous system disease from consuming mercury. Soon after, humans began to suffer similar symptoms and many died. Children of mothers poisoned by eating the mercury-tainted fish were born with severe deformities.

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