The paper 鈥淪hifts in the feeding ecology of the endemic and Endangered Sardinella tawilis in Lake Taal, Philippines鈥� showed that the tawilis, which have been found to feed on zooplanktons,preferred 鈥渃yclopoid copepods and [showed a] noticeable increased preference for Moina micrura, Ceriodaphnia cornuta, and Bosmina fatalis.鈥� This showed a shift from its earlier preference for calanoids. The findings were elicited from an application of stable isotope analysis and gut content analysis.

The new study was published on June 5, 2025 in Endangered Species Research, Volume 57, and was authored by a team of scientists from UST, De La Salle University, University of Rizal System, and the Department of Science and Technology. The authors are: Dale Anthony L. To (UST, DLSU), Asst. Prof. Elfritzson M. Peralta, MSc (UST), Justine R. De Leon (UST), Alexis E. Belen (UST), Lloyd Matthew L. Pineda (UST), Inst. Walled T. Ali (UST), Miguel Angelo F. Dollete (UST), Inst. Ray Allan N. Zafra (UST), Norman Mendoza (DOST), Prof. Richard Thomas B. Pavia, PhD (UST), Assoc. Prof. Dino T. Tordesillas, PhD (UST), Jonathan Carlo A. Briones (UST, URS), and College of Science Dean Rey Donne S. Papa, PhD.

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A team of aquatic biologists and microbiologists led by Asst. Prof. Reuel Bennett, Dr.rer.nat., Chair of the Department of Biological Sciences, and Inst. Elfritzson Peralta, M.Sc., together with DBS academic staff Inst. Allan Gilles, M.Sc. and Inst. Eunice Aaron, M.Sc. (Marine Biology team), Inst. Justine De Leon, M.Sc. and Inst. Kenneth Xavier Sanchez, M.Sc. (Freshwater Biology team) conducted the study from August 11 to 14, 2024. The team covered 26 study sites in the watershed area, including mangrove forests, coastal areas, estuaries, streams, rivers, and a freshwater lake – Lake Danao.聽

On September 17, 2024, Peralta, Assoc. Prof. Richard Thomas B. Pavia Jr., PhD, and Inst. Allan Gilles Jr., MSc presented the project’s initial results to Mayor Torres-Gomez. Also present were City Councilors Peter Rodriguez, Caren Torres Rama, Edmund Kierulf, and Bert Pades, together with officials from the City Environment and Natural Resources Office, City Agricultural Office, and representatives from the Protected Areas Management Board.

This initiative, which underscores the strong partnership between UST scientists and their government counterparts, is a testament to their shared commitment to bring science to the community.

Academic and research staff of the UST Department of Biological Sciences conducting the water quality monitoring, biological sampling and microbiological analysis of aquatic ecosystems in Ormoc Bay and its tributaries.

The UST Team, Mayor Lucy Torres Gomez, and the City of Ormoc officials after the presentation of the team鈥檚 initial findings.

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Thomasian participants also shared their works in the Isotope Workshop that discussed results of ongoing researches in stream and lake ecosystems using isotope analyses. Asst. Prof.聽Felicidad Christina Ramirez, Ph.D. of the聽听补苍诲听Research Center for the Natural and Applied Sciences聽presented updates of her research entitled, 鈥淭racing phosphate sources in the Silang-Sta. Rosa Subwatershed using oxygen isotopes鈥�. Similarly, Peralta presented updates on his research on isotope ecology in Philippine freshwater systems.

JpGU is an academic union that encompasses all the Earth and Planetary Sciences disciplines and related fields, organizing annual meetings since 2005. Presentations were all done under the 鈥淢aterials transport and nutrient cycles in watersheds; Human and climate impacts鈥� session. The participation of the students was made possible through the research project entitled Biodiversity-driven Nutrient Cycling and Human well-being in Social-ecological Systems鈥� also known as the 鈥渆-REC Project鈥� funded by the Research Institute for Humanity and Nature (Kyoto, Japan) led by Prof. Dr. Noboru Okuda with Prof. Dr.  as project leader for the 色鸡导航.

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Winning First Place for the study 鈥淢olecular phylogeny of selected Philippine Ophiorrhiza L. [Ophiorrhizeae-Rubiaceae] including two new endemic species鈥� were Neil Joseph Lee, Christian Alvin T. Arca, Ana Maria Rosella D. Carreon, Ricardo T. Jalipa III, and Ni帽a Kathryn G. Alfeche, under the advisory of Prof. Grecebio Jonathan D. Alejandro, Dr. rer. nat.

UST students likewise clinched the top two spots in the Research Poster contest. Winning first place was Elfritzson Peralta, under their advisers Prof. Rey Donne S. Papa, PhD and Mr. Jonathan Carlo Briones, PhD of UST, Dr. Francis Magbanua of University of the Philippines 鈥� Diliman, and Dr. Noboru Okuda of the Research Institute for Humanity and Nature, Japan. They worked on the study 鈥淭axonomic Sufficiency: Implications from ecological studies on aquatic insects in Philippine watersheds.鈥�

Winning 2nd Best Research Poster Award in the same event were Joe Alvin H. Chua, Tim Eric Dave B. Bautista, Alyssa Marie A. Lola, Marie Stephanie L. Macalino, Jay Edneil C. Olivar, and Hidenori S. Tomimatsu. They worked on the study 鈥淯tilization of high performance liquid chromatography [HPLC] and barcoding for the authentication of Ehretia microphylla Lam. [Tsaang gubat] and Blumea balsanifera L. [Sambong] derived products.鈥� They were advised by Prof. Allan Patrick G. Macabeo, Dr. rer. nat. and Prof. Grecebio Jonathan D. Alejandro, Dr. rer. nat.

#ThomasianExcellence #ThomasianResearchers

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