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Leaf Pattern Design

CHRIS CARL Agustin V. TOYADO

Research focus:

 

Biogeochemistry of past and present environments, pristine or anthropogenically impacted.

Journal articles

Jaraula CMB*, Toyado CCAV (2026 September) Geochemical proxy records on terrestrial input, redox conditions, and organic matter preserved in a tropical paleo-lagoon during the mid-Holocene (Laguna de Bai, Philippines). Journal of Paleolimnology 74:30. https://doi.org/10.1007/s10933-026-00410-5

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Toyado CCAV, Jaraula CMB* (2025 October) Phases of anthropogenic activities since the mid-20th century from the sediment geochemistry of Laguna de Bai (Philippines). Journal of Great Lakes Research 51:102635. https://doi.org/10.1016/j.jglr.2025.102635

Education

M.Sc. Marine Science, 2025

The Marine Science Institute

University of the Philippines, Diliman, Quezon City

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B.Sc. Geology, 2016

National Institute of Geological Sciences

University of the Philippines, Diliman, Quezon City

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Conferences and Workshops

Jaraula CMB* [oral presenter], Toyado CCAV (2026 August 13 to 16) Anthropocene signals in natural analogues of warming and acidification. UNESCO IUGS IGCP Project 732's Annual Meeting for the year 2026, Islamabad, Pakistan.
 

Toyado CCAV, Jaraula CMB* [oral presenter] (2025 July 10 to 12) Element proxy biogeochemical dynamics in a tropical paleo-lagoon: Laguna de Bai, Philippines, 6,640 to 4,700 years before present. Philippine Association of Marine Science's 18th National Symposium on Marine Science, University of the Philippines, Cebu City.
 

Toyado CCAV [oral presenter], Jaraula CMB* (2025 March 28) One way to make a hypersaline lagoon: The case of Laguna de Bai, Philippines, 5,500 to 5,000 years before present. Arribada: Marine Science Institute’s Annual Research Fest, University of the Philippines, Diliman, Quezon City. Awarded best oral presentation.
 

Toyado CCAV [oral presenter], Jaraula CMB* (2024 October 22 to 24) Paleo-rainfall and -productivity relationship in a tropical paleo-lagoon over the last 6.7 millennia. 56th Annual Convention of the Federation of Institutions for Freshwater and Marine Sciences, Mati City, Davao Oriental, the Philippines.
 

Mabanta IC [poster presenter], Toyado CV, Popes MG, Dimalanta WP, Jaraula CB* (2024 June 23 to 28) Inorganic Geochemical Composition of Sediments Influenced by Submarine Groundwater Discharge (SGD) in Mabini, Batangas. 21st Annual Meeting Asia Oceania Geosciences Society, Pyeongchang, South Korea.
 

Popes MG [poster presenter], Toyado CV, Sturchio NS, Cardenas BR, Rodolfo RS, Lapus MR, Jaraula CB* (2024 June 23 to 28) Trace Metal, Ionic, and Isotopic Concentrations in Hydrothermally-induced Submarine Groundwater Discharge Areas in Mabini, Batangas. 21st Annual Meeting Asia Oceania Geosciences Society, Pyeongchang, South Korea.
 

Toyado CCAV [oral presenter], Jaraula CMB* (2023 November 17) The timing of Anthropocene phases in the Philippines are shared across Southeast Asian records. UNESCO IUGS IGCP Project 732's Annual Meeting and Workshop for the year 2023, Xi’an, China.
 

Toyado CCAV [poster presenter], Jaraula CMB* (2023 November 13) Rainfall at Laguna Lake since the mid-Holocene: Insights from sediment core grain sizes and geochemistry. 4th Graduate Student Research Conference, College of Science, University of the Philippines, Diliman, Quezon City.
 

Toyado CCAV [oral presenter], Jaraula CMB* (2023 October 17 to 18) Geochemical and grain size evolution of paleo-Laguna Lake from a marine lagoon to a freshwater lake: Watershed input, primary productivity, and redox. Annual Research Symposium of the National Institute of Geological Sciences, University of the Philippines, Diliman, Quezon City.
 

Contributor to Jaraula CMB*, Limen MAG, Otero MCB, Miguel RM, Kobayashi VB, Baja ES, Del Mundo DMN, Murao LAE (2023 August 30 to September 2) Evaluation of physico-chemical factors affecting Wastewater-Based Epidemiology of SARS-CoV-2 in a southern Philippine sewershed. 18th International Conference on Environmental Science and Technology, Athens, Greece. https://doi.org/10.30955/gnc2023.00229
 

Toyado CCAV [oral presenter], Siringan FP, Jaraula CMB* (2023 July 20 to 22) The marine phase of paleo-Laguna Lake (6.6 to 5.1 ka): A reconstructed sediment archive of its redox, primary productivity, and watershed input. Philippine Association of Marine Science's 17th National Symposium on Marine Science, Batangas, the Philippines.
 

Popes MG [oral presenter], Toyado CV, Elegado AP, Cardenas MR, Bautista VII AT, Rodolfo RS, Lapus MR, Mendoza NS, Jaraula CB* (2023 June 19 to 23) Submarine groundwater discharge characterization using metals and major ions in Mabini coastal waters (Batangas, Philippines). 5th Asia-Pacific Coral Reef Symposium, National University of Singapore.
 

Contributor to: Jaraula C* [oral presenter] (2023 May 6 to 9) Palaeoenvironmental history of Laguna de Bay. Max Planck Institute of Geoanthropology's PANTROPOCENE Workshop, University of the Philippines, Diliman, Quezon City.
 

Toyado CCAV [poster presenter], Jaraula CMB* (2023 February 20) Bulk elemental records delineate the start of the Anthropocene in Laguna Lake sediments (Philippines) and reconstruct trends in paleoproductivity. Arribada: Marine Science Institute’s Annual Research Fest, University of the Philippines, Diliman, Quezon City.
 

Toyado CCAV [oral presenter], Jaraula CMB* (2022 December 17) Anthropogenic sediments from Metro Manila that could enter the South China Sea [oral presentation]. UNESCO IOC-WESTPAC's 15th International Workshop on Fluvial Sediment Supply to the South China Sea, online.
 

Popes MG [oral presenter], Toyado CCAV, Bucsit PPP, Enova AER, Rañada MVV, Mariano SMF, Elegado AFKP, Cardenas MBR, Rodolfo RS, Lapus MR, Jaraula CMB* (2022 December 17) Metals and nutrients across different submarine groundwater discharge sites in Mabini, Batangas (Philippines). UNESCO IOC-WESTPAC's 15th International Workshop on Fluvial Sediment Supply to the South China Sea, online.
 

Toyado CCAV [oral presenter], Jaraula CMB* (2022 November 14 to 16) Direct and indirect anthropogenic indicators in Laguna Lake, Philippines. UNESCO IUGS IGCP Project 732's Nairobi’s Anthropocene 2022 - past, present and future archives: Exploring Nairobi’s potential for a GSSP, Nairobi, Kenya.
 

Toyado CCAV [poster presenter], Jaraula CMB* (2022 September 22 to 23) Associations of Bulk Elemental Records from Laguna Lake Sediments (Philippines) During the Last Century. 10th (Philippine) Department of Science and Technology - Accelerated Science and Technology Human Resource Development Program Graduate Scholars’ Conference, online.
 

Toyado CCAV [poster presenter], Jaraula CMB* (2022 August 1 to 5) Trace metals as possible markers of Anthropocene at Laguna Lake, Philippines. 19th Annual Meeting of the Asia Oceania Geosciences Society, online.
 

Jaraula CMB* [oral presenter], Toyado CCAV, Mariano SMF, Rollon AEP, Gernato EGM (2021 October 18 to 20) Anthropogenic markers on some coasts of the Philippine archipelago. UNESCO IUGS IGCP Project 732's Kick-off Meeting, online.
 

Jaraula CMB* [plenary speaker], Elegado AFKP, Cardenas MBR, Bautista AT VII, Rodolfo RS, Lapus MR, Mendoza NDS, Toyado CCAV (2021 October 13 to 14) Hydrothermal Fluid Geochemistry and Ecology in Shallow Hydrothermal Vents in Mabini, Batangas. Annual Research Symposium of the National Institute of Geological Sciences, University of the Philippines Diliman, online.
 

Toyado CCAV [oral presenter], Jaraula CMB*, Siringan FP (2020 December 19) Laguna de Bay (Laguna Lake, Philippines) paleoclimate for the last 6.6 ka. UNESCO IOC-WESTPAC's 13th International Workshop on Fluvial Sediment Supply to the South China Sea, online.

Contact

    E-mail:    ccavt@yahoo.com

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