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| | | Coastal and Marine Ecosystems |
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|  The physical modification of natural aquatic inland ecosystemsthrough the damming of rivers or the building of irrigation systems, for example, has often led to the creation of new ecosystems. These activities may also have unintended impacts on marine ecosystems, as seen in the example of the retention of nutrient-rich Nile waters through the building of the Aswan High Dam and the resulting collapse of the sardine fisheryin the Nile Delta.Ecosystems, on which fisheries depend, generally range from coastal areas to the open ocean, from tropical to polar oceans, including some semi-enclosed or enclosed seas. They include the lower end of river watersheds and their plumes, bays, estuaries and lagoons, coral and other reefs, continental shelves and slopes, and upwelling areas. | | |  Large Marine Ecosystems (LMEs)are relatively large regions (200 000 km2 or more) of the oceans characterized by distinct bathymetry, hydrography, productivity and trophically dependent populations. | | | | Neither pristine nor exploited ecosystems are static, but are subject to environmental variations. The frequency of these environmental changes and their amplitude vary widely. The greater and more frequent they are, the more significant the implications for productivity and for the management of fisheries. Natural variability adds to the uncertainty that should be considered in managing the harvesting of the resources of an ecosystem. A system's resilience to human impacts and their capacity to recover from serious disturbances varies with such natural cycles. | | | | Of particular significance is the El Niño Southern Oscillation (ENSO) phenomenon, a naturally occurring global climate cycle involving complex interactions between the surface of the ocean and the atmosphere in the tropical Pacific. El Niño (warm) and La Niña (cold) events are extreme phases on the ENSO cycle. It has been increasingly accepted that the ENSO phenomenon has a global impact. | | | | Fifty LMEs have now been identified extending across regions encompassing coastal areas from river basins and estuaries to the seaward boundary of continental shelves and the seaward margins of coastal current systems. | | | | |
 | | | | | | | Title | The Great Barrier Reef. History, Science, Heritage.
( BOOK )
|  | | Author(s) / Editor(s) | Bowen, J.; Bowen, M. | | Description | One of the world’s natural wonders, the Great Barrier Reef stretches more than 2000 kilometres in a maze of coral reefs and islands along Australia’s north-eastern coastline. Now unfolding the fascinating story behind its mystique this book provides for the first time a comprehensive cultural and ecological history of European impact, from early voyages of discovery to the most recent developments in Reef science and management. Incisive and a delight to read in its thorough account of the scientific, social and environmental consequences of European impact on the world’s greatest coral reef system, this extraordinary book is sure to become a classic. | | Keywords | CORAL REEFS; HISTORY; SCIENCE; HERITAGE | | Geography Keywords | GREAT BARRIER REEF; SOUTH PACIFIC OCEAN; AUSTRALIA | | Content Language(s) | English | |
| Web Address | http://books.cambridge.org/0521824303.htm | |
| Type of Book | Book | | Purchase Info URL | http://books.cambridge.org/0521824303.htm | | Publisher | Cambridge University Press | | Publication Location | Cambridge (UK) | | Publication Date | January 2003 | | Hard Copy Availability | Order by phone (+44 (0)1223 326050) or fax (+44 (0)1223 326111). | |
| Reference Info | | Edition | 1st Ed. | Number of Pages | 474 pp |
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1076 Topics - 5135 Related Knowledge - 2534 Members - 34 Editors |
