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rounded 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 sea grass and algal beds and soft-bottom communities that often occur in close proximity to mangroves and coral reefs, sea grasses ecosystems have a very high primary productivity and play an important role in the Philippine marine environment. sea grasses are a prominent component of Philippine coastal ecosystems, sea grasses are biota and habitat in one, they naturally and simultaneously function both as primary producers and structural species.      Sea grass serve as habitats and breeding grounds for various marine organisms that are economically important to the local populace, sea grasses 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. Sea grasses are not true grasses, this are a vascular plants. The vascular system in the sea grasses 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, sea grass 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.      Sea grasses in the Philippines are important food for the marine green turtles and dugong.  According to Len McKenzie “Sea grass Watch”there are 13 sea grass species that can be found in the Philippines, Cymodocea rotundata, Cymodocea serrulata, Enhalus acoroides, Halodule pinifolia, Halodule uninervis, Halophila beccarii, Halophila decipiens, Halophila minor/ovata, Halophila ovalis, Halophila spinulosa, Syringodium isoetifolium, Thalassodendron ciliatum and Thalassia hemprichii (Spalding 2000). These species of sea grasses present contrasting growth forms and growth capacities, from the small, fast-growing Halophila species to the large E. acoroides. The contrasting growth strategies have been postulated to confer on them differential capacities to survive disturbance (Terrados et al., 1998).      According to Pa-Alberto A. M., Hechanova M. P. and Sigua G. C. sea grasses are kade of less than 0.02% of the angisperm flora, representing a surprisingly small of number species. There are 16 taxa in Philippines and considered as the second highest species of sea grass in world.     In Philippine, the demonstration site of sea grasses has been established in Bolinao, Pangasinan and a seagrass sanctuary, in Narra, Palawan,  In Bolinao, the main achievements included the development of a management plan that has been adopted by the local government, development of a Bolinao Seagrass Reserve, implementation of a sustained information, education and communication program, capacity building and provision of alternative livelihood programs. Local law enforcement in habitat management using the Bantay Dagat (Sea Watch) has also been instituted (UNEP, 2008).           In Camotes Islands sea grasses serves as the breeding ground for several species of fish especially siganids, seagrass as marine angiosperms, one of the features of seagrasses is their ability to reproduce underwater and studies on its reproduction and phonology are important so as to know the population dynamics (Walker et al.2001). Seagrasses are highly specialized marine flowering plants adapted near shore. They are not monophyletic group of plants but is a functional grouping referring to marine flowering plants living entirely submerged and sharing numerous convergent morphological and physiological characteristics.      Enhalus is one of the most prominent sea grasses in the Philippines, enhalus produces 2.8 flowers per shoot per year on average and allocates up to 20% of its aboveground production to flowering and fruiting, in the reef flats off Cape Bolinao, this species is able to colonize various habitat types (Vermaat et al., 1995; Rollón et al., 1998). Enhalus shoots differ in morphology, biomass and density (Rollón, 1998). The other prominent sea grasses in Philippines that can be found in Bolinao is Thalassia Hemprichii.     According to Ame E. C. and Ayson J. P, “Preliminary Assessment of the Sea grass Resources in the Northern Philippines”,  one species of sea grass was found to thrive in Buguey, Cagayan and it is located on the lagoon. The lagoon has two openings, one for marine water and the other for freshwater. The mixing of saltwater and freshwater from inland sources brings along nutrient rich organic materials which are utilized by this ecosystem. The lagoon is the most productive estuary in the entire region. In Buguey lagoon sea grass covers an estimated area of around 10 hectares sea grass coverage was estimated at 69.16%.      Philippine sea grasses could be considered truly ecological, Fortes (1981) made the first account on the structure and productivity of the epiphytic community on Enhalus leaves at Calatagan, Batangas. Fortes made a preliminary assessment of the organic matter contributions of dominant producer communities including E. acoroides at the same time.   According to Agawin et al. (1996), different seagrasses have different nutrient requirements. The requirement makes their biogeography limited between mangrove and coral reef ecosystem, the distribution of each species can be aggregate and assemble.  Species like Syringodium can tolerate disturbance in coral reef, while Enhalus are near mangrove forest, because of their sensitivity in siltation. Enhalus and Thalassia species are co-occuring in the same area and can tolerate inter and intraspecific competition. There morphology dictates because they are taller than other seagrasses (Calumpong and Meñez, 1997). The water depth and spatial are other factors that influence the mixed meadow. As the water becomes deep, the distribution changes, that is the Enhalus is capable of infiltrating deeper water. The near-shore seagrasses are commonly rhizomal and small size, like Halodule spp., tolerating sandy area, while deeper and muddy area are dominated by Enhalus species.Seagrasses do not exist in nature as a separate ecological component from other marine plants and are often closely linked to other community types. In the tropics theassociations are likely to be complex interactions with mangrove communities and coral reef systems. In temperate waters, algae beds, salt marshes, bivalve reefs, and epiphytic plant communities are closely associated with areas of seagrass. Many management actions to protect seagrasses have their genesis in the protection of wider ecological systems or are designed to protect the overall biodiversity of the marine environment.

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