Vallejo BMJ, Aloy AB. 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. 2014;(in press).Abstract
The response of the bird community in the University of the Philippines Diliman Campus was evaluated before and after the university embarked on major infrastructure and landscape development in 2006-2008. Surveys using the Jokimäki walk were made monthly from 2004-2006 prior to development and from 2007-2010 after development in three 22-25 ha plots, i.e., 1) College of Science (CS), 2) Academic Oval (OV) and 3) Open Fields (OP), representing biophysical development gradient. Diversity indices before and after redevelopment were compared. Principal components analysis (PCA) and Ordinary least squares (OLS) regression were done to determine how the dominant species responded to change over time. The Eurasian Tree Sparrow Passer montanus and the Yellow vented bulbul Pycnonotus goiaiver experienced declines in all plots but most significantly in the CS plot which experienced the most infrastructure development. A MANOVA was used to determine if the declines in Passer and Pycnonotus populations had an effect on other species in the CS plot. MANOVA results suggest that the declines are significant with the increase in populations of the flycatcher Gerygone and the ground dove Geopelia suggesting ecological replacement of the once numerous species.
Pawlik, A., Piper P, Faylona P, Padilla Jr. S, Carlos, J, Mijares A, Vallejo Jr B, Reyes M, Amano N. 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 . 2014;(in press).
Vallejo BM SK. Matrix population model of the “janitor fish” from the Marikina River and possibilities of controlling this invasive species. Philippine Science Letters . 2011;4.
Jumawan JC, Vallejo BM HAABCCFKC. 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. 2011;4 :2.
Aloy AB, Vallejo Jr BM, Juinio-Meñez MA. Increased plastic litter cover affects the foraging activity of the sandy intertidal gastropod Nassarius pullus. Marine Pollution BulletinMarine Pollution Bulletin. 2011;62 :1772-1779.Abstract
This study analyzed the foraging behavior of the gastropod Nassarius pullus on garbage-impacted sandy shores of Talim Bay, Batangas, Philippines. The effect of different levels of plastic garbage cover on foraging efficiency was investigated. Controlled in situ baiting experiments were conducted to quantify aspects of foraging behavior as affected by the levels of plastic litter cover in the foraging area. The results of the study indicated that the gastropod’s efficiency in locating and in moving towards a food item generally decreased as the level of plastic cover increased. Prolonged food searching time and increased self-burial in sand were highly correlated with increased plastic cover. The accuracy of orientation towards the actual position of the bait decreased significantly when the amount of plastic cover increased to 50%. These results are consistent with the significant decreases in the abundance of the gastropod observed during periods of deposition of large amounts of plastic and other debris on the shore.
Vallejo BJ. The Philippines in Wallacea. Biodiversity, Biogeography and Nature Conservation in Wallacea and New GuineaBiodiversity, Biogeography and Nature Conservation in Wallacea and New Guinea. 2011;1 :27.
Cruz, RA VBM. Species Discrimination in Philippine Oliva Linnaeus 1758 (Gastropoda: Olividae) Using Size and Shape Diversity Measures. Loyola Schools Review, Science and Engineering. Loyola Schools Review, Science and Engineering. 2010.
Vallejo B, Ting T, Kristine S, Ramilla J, Obanan S. Observations on the natural history and external anatomy of Invasive Pterygoplicthys Gill 1858 in the Marikina River, Philippines with notes on possible biological control. Quezon City: Office of the Vice-Chancellor for Research and Development, University of the Philippines; 2010 pp. 24.
Chavanich S, Tan LT, Vallejo B, UNESCO-IOC-WESTPAC. Report on the Current Status of Marine Non-Indigenous Species in the Western Pacific Region. (Chavanich S, Tan LT, Vallejo B). Bangkok: Chulalongkorn University; 2010 pp. 74.
Vallejo B, Aloy AB, Ong P. Distribution, abundance and diversity of birds in Manila’s last greenspaces. Landscape and Urban Ecology. 2009;89 :75-85.
Vallejo B, Aloy AB. Estimating the rarity of birds and its ecological context in the University of the Philippines Diliman Campus. Philippine Science LettersPhilippine Science Letters. 2008;1 :23-36.
Vallejo BM, Aloy, AB, A T, Villasper J. Abundance and diversity of birds in an urban tropical landscape: The University of the Philippines campus. Science Diliman. 2008;20 :1-10.
Vallejo B. Don't flush it down the toilet: Are aquarium hobbyists to blame for invasive species introductions?. Proceedings of the Conference-Workshop on Invasive Alien Species in the Philippines and their Impacts on Biodiversity Compact Disc. . 2006 :8-10.
Vallejo B. Inferring the mode of speciation in Indo-West Pacific Conus (Gastropoda: Conidae). Journal of Biogeography. 2005;32 :1429–1439.
B V. Biogeography of a sandy shore gastropod, Oliva in the Philippines. Loyola Schools Review: Science and Engineering . 2004;3 :58-80.
Vallejo B. Biogeography of Coral Reef Shore Gastropods in the Indo-West Pacific. Marine Biology and Aquaculture. 2003 :285.
Sylianteng C, Jr BV. The Effect of Light and Current Flow on Captive Acropora spp. Biology. 2003;BSc.
Reyes M, Vallejo BM. Diet of the intertidal seastar Archaster typicus in Calatagan, Batangas. Loyola Schools Review . 2002;2 :2-7.
Vallejo B. Biogeography of Philippine Marine Molluscs. Loyola Schools Review. 2001 :21-42.
Vallejo B. A new species of Nerita from the Sibuyan Sea, central Philippines. La Conchiglia. 2000;22 :23-27.