Call Prefix : PR-T

Call Suffix : 1979

Call Cutter : D - Bota 5

Location : SEARCA Library

Format : TD

Publisher : University of the Philippines Los Banos,

Publication Date : June 1979

Publication Place : Los Banos, Laguna, the Philippines :

Summary : An extensive surface water sampling for algae was conducted from brackish - fresh-water fishponds in Bulacan and fresh-water fishponds in Mu¤oz, Nueva Ecija, Philippines, from September 1977 to September 1978. A total of 65 species of flagellated algae were identified belonging to 5 divisions, 6 orders, 11 families and 17 genera. These included 14 varieties of which three were probably new varieties. Twenty-two species were presented here for the first time in the country. Some of the physico-chemical properties of the study areas examined were pH, water and air temperatures, water transparency, dissolved oxygen, hydrolyzable and orthophosphate, and ammonia nitrogen content. These parameters seemed to be directly or indirectly affected by the type of season which, as a whole, affected by the fluctuation of the population of the flagellated algae both in terms of spatial and time differences. An exception was noted in Bulacan where the nutrient content of the water, particularly its phosphate and nitrogen contents, was more dependent on the cultural practices of the fishpond owners (i.e., extensive fertilization using chicken manure, and urea). Of the 11 flagellated species recorded in the fishponds with brackish-water, only the green algae, Chlamydomonas globosa and Carteria klebsii var. papillae, showed significant correlation with some of the physico-chemical variables when all the independent variables were taken together or individually. Both species of green algae were observed during the dry season when the conductivity and phosphate and nitrogen content of the water were high. However, C. globosa was found to show significant positive and negative linear correlation with the phosphate and nitrogen contents of the waters, respectively, while C. klebsii var. papillae showed positive linear relationship with conductivity readings. The fresh-water fishponds of Nueva Ecija recorded a relatively greater number of species of flagellated algae (59 species).