Benjamin M. Vallejo, Jr., Ph.D.
Associate Professor
Contact(s): or
Educ. Background:
Ph.D. Marine Biology, James Cook University, Australia (2003)
Manila University, Research Associate, International Centre for Living Aquatic Resources
Management (now WorldFish) (1993-1997)
Professional Aquarist, Aquarium Science Association of the Philippines, Inc, (1992-)
Master of Statistics (University of the Philippines Diliman)
MSc Marine Science (University of the Philippines, Diliman)
BSc Fisheries (University of the Philippines in the Visayas)

Interests / ProjectsCourses Handled & Other InformationPublication


  • Ecology of sandy, coral and rocky beaches
  • Coral reef gastropods as possible indicators of beach ecosystem change
  • Patterns of geographic marine species richness in the Philippines and Southeast Asia
  • Biogeographic models
  • Natural history of Olividae and Neritidae
  • Urban habitats and biogeography


Research Projects:

In Preparation

  • Anatomy of Oliva elegans and variations in the anatomy of five Oliva species from the Philippines

Popular Science

  • Island Magic: Understanding Philippine Biodiversity, The Philippine Star

Courses Teaching:

  • Env. Sci. 1
  • Env. Sci. 211
  • Env. Sci. 297
  • Env. Sci. 299
  • Env. Sci. 399


Other Relevant Information:

Membership in scientific organizations:

  • President-Aquarium Science Association of the Philippines
  • Member-International Coral Reef Society
  • Member-Philippine Association of Marine Science
  • Member-Asian Fisheries Society

Recent Publication:

  • Pawlik, A., Piper P, Faylona P, Padilla Jr. S, Carlos, J, Mijares A, Vallejo Jr B, Reyes M, Amano N. 2014. Preliminary Studies on Island Adaptation and Foraging Strategies in Changing Environments from Terminal Pleistocene to Early Holocene in the Philippines: Excavations at Bubog 1 and 2, Ilin Island,Mindoro Occidental. Journal of Field Archaeology
  • Vallejo BMJ, Aloy AB. 2014. Responses of the bird community in the University of the Philippines Diliman after campus redevelopment and the decline of two common urban bird species. Philippine Science Letters
  • Jumawan JC, Vallejo BM.2011. DNA barcodes of the suckermouth sailfin catfish Pterygoplichthys (Siluriformes: Loricariidae) in the Marikina River system, Philippines: Molecular perspective of an invasive alien fish species. Philippine Science Letters Philippine Science Letters.4(2)
  • Aloy AB, Vallejo Jr BM, Juinio-MeƱez MA. 2011. Increased plastic litter cover affects the foraging activity of the sandy intertidal gastropod Nassarius pullus. Marine Pollution BulletinMarine Pollution Bulletin. 62. pp. 1772-1779
  • Vallejo, B (2005) Inferring the mode of speciation in Indo-West Pacific Conus (Gastropoda: Conidae). Journal of Biogeography, 32(8): 1429-1439
  • Vallejo, B (2004) Biogeography of a sandy shore gastropod, Oliva in the Philippines. Loyola Schools Review 3:58-80
  • Vallejo, B and Gayos, G (2002). The effect of light intensity on Corallimorph Discosoma fragment growth and recovery under aquarium conditions. J. of Maquaculture. 7:1-5
  • Reyes, M. and Vallejo, BM (2002) Diet of the intertidal seastar Archaster typicus in Calatagan, Batangas. Loyola Schools Review.
  • Vallejo, B, Vallente-Samonte R, Chua, L and Panlilio, R. Genetic variation and taxonomic separation in Oliva(Neogastropoda:Olividae) species from the central Visayas, Philippines using a single marker (Marine Biotechnology)
  • Vallejo, B (2001) The Biogeography of Philippine marine molluscs. Loyola Schools Review 1: 58-77.
  • Vallejo B (2000) A new species of Nerita from the Sibuyan Sea, central Philippines, La Conchiglia 22: 23-27.