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The Philippines is an archipelago of about 7,100 island, surrounded by the South China Sea in the west, Sulu Sea and Celebes Sea in the south, the Philippine Sea, which opens into the Pacific Ocean, in the east, and the Luzon Strait in the north. Philippines is divided into four geographical regions; the Luzon Region, including the islands of Luzon, Babuyan, Catanduanes, Mindoro, Masbate, Romblon, and Marinduque; the Mindanao region, including Mindanao, Basilan, and the Sulu Group; the Visayas region, including Samar, Leyte, Bohol, Cebu, Negros, and Panay; and the Palawan region, including Palawan, Balabac, Culion, and the Cuyo Group. Philippines has extensive seagrass and algal beds and soft-bottom communities that often occur in close proximity to mangroves and coral reefs, seagrasses ecosystems have a very high primary productivity and play an important role in the Philippine marine environment. Seagrasses are a prominent component of Philippine coastal ecosystems, seagrasses are biota and habitat in one, they naturally and simultaneously function both as primary producers and structural species. Seagrass serve as habitats and breeding grounds for various marine organisms that are economically important to the local populace, seagrasses is obe of the most important resources in the coastal area, its ecosystem is  a good place for the spawning, breeding, nursing and refuge (Fortes 1989) of these organisms. Seagrasses are not true grasses, this are a vascular plants. The vascular system in the seagrasses consists of an internal network of tubes that is continuous from the roots to the leaf tips, transporting water, nutrients, and gases for tissue growth. Because of this system, seagrass growing in sand or mud can use the highly concentrated nutrients of the bottom, nutrients that may be hundreds or thousands of times more concentrated than those in the overlying water column.  The Philippines, the seagrasses  species could be ranked according to decreasing tolerance to siltation as: Enhalus acoroides > Cymodocea serrulata > Halodule uninervis > Thalassia hemprichii > Halophila ovalis > Cymodocea rotundata > Syringodium isoetifolium.Enhalus acoroides 

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