Download The Open Ocean (Life in the Sea) by Pam Walker PDF

By Pam Walker

It's only average for individuals to be serious about the ocean. lifestyles originated within the oceans, and greater than one-half of the folk in the world dwell inside of 50 miles of the ocean. even if, even if we now have despatched explorers to the moon and different areas of area, we nonetheless understand little in regards to the frontier that surrounds us. The attractive new "Life within the Sea" set offers younger readers with present, obtainable information regarding the ocean and its creatures. This finished source at the ocean's population offers dwelling issues of their actual habitats, emphasizing the connection among marine biology and marine ecology. every one quantity makes a speciality of one particular sector of the marine global, discussing its actual features, the residing issues discovered there, and the impression people have at the region. the proper significant other to "Facts On File's lifestyles on the earth" set (see dealing with page), this helpful reference provides a well-rounded view of marine existence.

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Extra info for The Open Ocean (Life in the Sea)

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Protists Hundreds of species of protists live among the bacteria in the plankton. Many, such as diatoms, dinoflagellates, and coccolithophores, are producers, responsible for much of the opensea photosynthesis. Others, including foraminiferans and radiolarians, are consumers. Diatoms are protists that are most commonly found in cool marine waters. The distinctive gold-brown color of diatoms is due to a combination of chlorophyll and a golden brown pigment. There are many species of diatoms, but all share some common traits.

Mucus also helps keep animals from eating them. A plant that grows on land is described with terms such as leaf, stem, and root. Seaweeds are made up of different components. The parts of seaweed that look like leaves are termed blades, or fronds. Some are equipped with small, gas-filled sacs, or bladders, that help keep them afloat and close to the sunlight. The gases in these bladders are usually nitrogen, argon, and oxygen. The stemlike structures of macroalgae are referred to as stipes. A root-shaped mass, the holdfast, anchors seaweeds but does not absorb nutrients like true roots do.

In sexual reproduction, male and female reproductive tissues release eggs and sperm into the water. Fertilized eggs develop into swimming larvae, each about the size of the head of a pin. Larvae swim some distance before settling to the bottom and permanently attaching to the substrate. A young coral may reproduce asexually by forming buds, tiny clones that grow from its base. In this way, the original polyp can form a colony of polyps. For protection, some species of coral secrete cup-shaped skeletons of calcium carbonate, or limestone.

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