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Lake
Sebu
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Location:
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6°14'N, 124°42'E; 53 km WNW of Buayan, South Cotabato Province, southern Mindanao. |
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Area:
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350 ha. |
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Altitude:
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c.700m. |
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Biogeographical
Province:
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4.26.12. |
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Wetland
type:
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14. |
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Description
of site:
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A small freshwater lake and associated marshes on the southeastern flank of the rugged Tiruray Highlands of South Cotabato. The shoreline of the lake is very indented, and there are two small islands, Tugayo and Rom's. The lake receives water from local run-off and several small rivers. It retains water throughout the year, and has a maximum depth of 45m. The bottom is sandy-mud. Values of 6.8 for the pH, 2.5 for the total hardness (SBV), and 8.0-8.5 p.p.m. for the dissolved oxygen, have been obtained. |
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Climatic
conditions:
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Humid tropical climate with an average annual rainfall of 934 mm, more or less evenly distributed throughout the year (Type IV). Mean temperatures range from 27°C to 28°C. |
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Principal
vegetation:
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The aquatic vegetation includes Eichhornia crassipes, Nymphaea sp, Hydrilla sp, Ipomoea reptans, Pistia stratiotes and Vallisneria sp. The lake is surrounded by grassland. |
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Land
tenure:
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The lake is state owned. Surrounding areas have been designated as ancestral lands and reservation areas for cultural minorities. |
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Conservation
measures taken:
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None. |
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Conservation
measures proposed:
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The Haribon Foundation has proposed that fish sanctuaries be established in strategic areas to protect the spawning grounds of both indigenous and introduced species. |
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Land
use:
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Fishing, duck-raising and the harvesting of freshwater shrimps and snails. Major fisheries include Tilapia spp, Ophicephalus striatus, Cyprinus carpio and Glossogobius sp; minor fisheries include Anabas testudineus, the freshwater shrimp Macrobrachium sp, and the freshwater snails Vivipara angularis and Ampullaria luzonica. Surrounding areas are inhabited by indigenous tribes and other cultural minorities, including the controversial Tasaday tribe. |
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Possible
changes in land use:
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| Disturbances and threats: | None known. |
| Economic and social values: | The lake supports a rich fishery. |
| Fauna: | The lake has a diverse fish fauna, and supports large populations of the freshwater snails Vivipara angularis and Ampullaria luzonica. No information is available on the waterfowl. |
| Special floral values: | No information. |
| Research and facilities: | Gracia et al. have carried out a study of the lake's fishery. |
| References: | Bureau of Fisheries and Aquatic Resources (1984-85); Gracia et al. (undated). |
| Criteria for inclusion: | 1b, 2b. |
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Source:
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Haribon Foundation. |