Now showing items 1-2 of 2

    • Conference paper

      Bathymetry and hydrobiology of Lake Mahagnao, Leyte. 

      RA Francisco, MR Pundavela, JM Granali, LA Tumabiene, JP Alpino & VV Elmido - 2001 - Aquaculture Department, Southeast Asian Fisheries Development Center; Philippine Council for Aquatic and Marine Research and Development; Bureau of Fisheries and Aquatic Resources
      Lake Mahagnao in Burauen, Leyte (10° 52.15' N and 124° 51.32' E) lies 26 m above sea level. It is surrounded by a mountain range that includes a dormant twin volcano. A bathymetric survey established 122 sampling stations using Global Positioning System. The stations formed transect lines across the lake. A bathymetric map of Lake Mahagnao was generated with the use of the SURFER software. Lake Mahagnao has a shoreline of 15,590 m and surface area of 15.75 ha. The deepest portion of the lake is 18.75 m. The mean pH of the water is 6.58; water surface temperature, 27oC; and water visibility, 1.64 m. Eighty-one species were identified as primary producers. Station 5, the deepest portion of the lake, had the highest phytoplankton density at 4,716 cells/ml and Station 2 had only 634 cells/ml. Cyanobacteria were the most abundant in all the sampling stations.
    • Article

      Carrageenan properties and proximate composition of three morphotypes of Kappaphycus alvarezii Doty (Gigartinales, Rhodophyta) grown at two depths 

      AQ Hurtado-Ponce - Botanica Marina, 1995 - Walter de Gruyter
      Three morphotypes (brown, green and red) of Kappaphycus alvarezii grown at two depths were evaluated for carrageenan properties and proximate composition. The green morphotype was significantly different from the brown and red in all carrageenan properties except for sulfate content at 50 cm below the water surface; and significantly different only from the brown at 100 cm. Except for ash content and nitrogen free extract there were no significant differences in proximate composition (nitrogen, crude protein, crude fat, crude fiber) among the three morphotypes.