LakeCon2003
http://hdl.handle.net/10862/6109
Proceedings of the First National Congress on Philippine Lakes2024-03-29T12:14:17ZFive thousand years of environmental history: Paoay Lake, northern Luzon, Philippines
http://hdl.handle.net/10862/6113
Five thousand years of environmental history: Paoay Lake, northern Luzon, Philippines
Stevenson, Janelle; Finn, Jan; Siringan, Fernando P.; Madulid, Domingo
Cuvin-Aralar, Maria Lourdes; Punongbayan, Raymundo S.; Santos-Borja, Adelina; Castillo, Lourdes V.; Manalili, Eduardo V.; Mendoza, Marlynn M.
The environmental history of Paoay Lake and its surrounding landscape is being examined through the analysis of pollen, diatoms, charcoal, mineral magnetics, and AMS dating. The project is part of a larger program of archeological research that examines the theory indicating an expansion of Neolithic people taking place out of Taiwan and into island southeast Asia around 4,000 years ago. The primary intention of the lake study is to determine if there is evidence of land clearance and agricultural development in the region during the late Holocene. Sediment cores collected from two different locations contain the last 6,000 years of environmental history at Lake Paoay. Pollen analysis shows that coniferous forest, dominated by Pinus, was prevalent in the landscape surrounding the site until around 5,000 years ago when the pollen signature changes to that more indicative of an open landscape (primarily grass). Charcoal as an indicator of fire is abundant throughout record, although the highest levels appear to occur around the time of forest decline. This corresponds well with a similar shift in vegetation at 5,000 years ago from the only other pollen core in the Philippines, Laguna de Bay.
2005-01-01T00:00:00ZLake Taal's freshwater sardines Sardinella tawilis (Herre): Evolutionary insights based on morphological, molecular, and geological data
http://hdl.handle.net/10862/6115
Lake Taal's freshwater sardines Sardinella tawilis (Herre): Evolutionary insights based on morphological, molecular, and geological data
Pagulayan, Roberto C.
Cuvin-Aralar, Maria Lourdes; Punongbayan, Raymundo S.; Santos-Borja, Adelina; Castillo, Lourdes V.; Manalili, Eduardo V.; Mendoza, Marlynn M.
Sardines (family Clupeidae or herrings) are mostly marine species. In the Philippines, Lake Taal is the habitat of Sardinella tawilis (local name tawilis ), the only local endemic sardine species known to be fully adapted to a freshwater environment. Its evolutionary history is thus of great interest. So far, analyses of morphometric, meristic, isozyme, and mtDNA data point to the marine species Sardinella albella as the closest marine relative. Furthermore, mitochondrial DNA data revealed restricted substitution that may indicate either the beginning of a genetic differentiation of two tawilis sub-populations or the ghost of polymorphism past strengthened by genetic drift. Sardinella tawilis is believed to have emigrated from Balayan Bay to Lake Taal when it was formed in the course of volcanic eruptions some 240 years ago. The data do not, so far, support this contention. An alternative explanation on the speciation of this species is presented here.
2005-01-01T00:00:00ZOrigin of Philippine lakes
http://hdl.handle.net/10862/6111
Origin of Philippine lakes
Punongbayan, Raymundo S.
Cuvin-Aralar, Maria Lourdes; Punongbayan, Raymundo S.; Santos-Borja, Adelina; Castillo, Lourdes V.; Manalili, Eduardo V.; Mendoza, Marlynn M.
The paper discusses the origin of the major and minor lakes throughout the Philippines.
2005-01-01T00:00:00ZChanges in lake morphology as source of basic information for lake management: A case study on Laguna Lake, Philippines
http://hdl.handle.net/10862/6112
Changes in lake morphology as source of basic information for lake management: A case study on Laguna Lake, Philippines
Siringan, Fernando P.; Jaraula, Caroline Marie B.
Cuvin-Aralar, Maria Lourdes; Punongbayan, Raymundo S.; Santos-Borja, Adelina; Castillo, Lourdes V.; Manalili, Eduardo V.; Mendoza, Marlynn M.
2005-01-01T00:00:00Z