By Trevor Day
The Ecosystems sequence is the one resource that gives a whole realizing of world ecology. Illustrated with attractive full-colour pictures, each one quantity combines the "hard sciences," equivalent to biology and chemistry, with background, economics, and environmental experiences. every one atmosphere is gifted in its entirety with info on its heritage, biology, natural world, attractiveness, difficulties, and effect on tradition. This interdisciplinary method emphasizes the advanced, interrelated nature of every biome - giving readers the main built-in portrayal of the flora and fauna on hand. each one quantity spans Europe, Asia, Australia, Antarctica, and the Americas to offer a selected environment. insurance deals a uncomplicated advent to ecological recommendations and demonstrates how those options impression the complicated courting among people and the surroundings.
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Additional info for Oceans (Biomes of the Earth)
GEOGRAPHY OF THE OCEANS Inshore islands lie on continental shelves. They were once joined to the continental mainland. Since that time sea levels have risen or the continental landmass has sunk (subsided) so that the land connection between the two has become submerged. The British Isles are islands of this type. Only 18,000 years ago, at the peak of the last ice age, they were connected to the European mainland. Since then, the glaciers and ice sheets that covered much of northern Europe have melted away.
Few animals are adapted to live in these oxygen-poor conditions, and among those that are able to, most live in the top inch or so or have burrows that bring in fresh supplies of water and oxygen. The drastic changes in salinity (saltiness) pose another problem for creatures living in estuaries. At low tide, and especially after heavy rainfall, the river’s water strongly dilutes the seawater of the estuary. When the tide is high, and river flow is reduced, the river’s influence is minimal, and the estuary water can be nearly full-strength seawater.
Animal plankton (zooplankton) feed on the phytoplankton, and they are consumed by fish, which in turn are eaten by larger fish and marine mammals. In warm clear waters, coral reefs grow on the flanks of islands, producing the most complex animal and plant communities in the ocean (see “The living reef,” pages 151–154). Seamounts There are between 30,000 and 50,000 seamounts across the world. These extinct underwater volcanoes pepper the abyssal plains of the deep ocean, rising at least 3,280 feet (1,000 m) above the seafloor.