IPA Recipients for December 2015

Oscar T. Serquiña Jr.
Department of Speech Communication and Theatre Arts
College of  Arts and Letters
UP Diliman

Voices and Visions: Symbolic Convergences in the Oral Narratives of Filipino Comfort Women. Humanities Diliman, 12 (2): 79-109, July-December 2015.

This paper analyzes oral narratives of 10 Filipino comfort women, who are members of the Liga ng mga Lolang Pilipina, or Lila Pilipina, an organization of victims and survivors of sexual slavery by Japanese military soldiers during the World War II in the Philippines. Guided by Ernest Bormann’s Symbolic Convergence Theory, this paper aims to describe the content, identify the salient structure, and determine the rhetorical vision in the oral narratives of Filipino comfort women. This paper argues that a pattern of characters, settings, and plotlines may be discerned from the oral narratives, and that these formal elements structurally and ideologically constitute the comfort women’s rhetorical vision of the future. This rhetorical vision is by and large a social drama that visualizes a just and warless society, renders the war as the major culprit in the destruction of Filipinos’ lives, and highlights the roles of Filipino comfort women and the youth in fighting militarization and in seeking peace and social justice in society.

Link to the article: 
Impact Factor: Not yet available

Jerine A. Amado and Roland Sarmago
National Institute of Physics
College of Science
UP Diliman

AC Magnetic Susceptibility and Morphological Development of YBCO HTS Formed from Y:Ba:Cu = 1:2:3 and 3:5:8. Journal of Superconductivity and Novel Magnetism, 28 (2): 3455-3461, December 2015.

Zero resistance means zero energy loss.
Unique properties of superconductors include zero resistance to direct current, extremely high critical current density, low resistance at high frequency, low signal dispersion, high sensitivity to magnetic field, exclusion of externally applied field, and close to speed of light signal transmission. The impact of zero resistance and high current density is most straightforward to electric power transmission1.
Other uses of superconductors are for power generation, energy storage, magnetic levitation for transportation, superconducting coils for generating strong fields, accelerators for particle physics, bolometers for radiation particle detection, and magnetic resonance imagery used in medicine2.  Challenges faced in using superconductivity down to household level include material cost, refrigeration, reliability, and acceptance.
Application- oriented studies aim to reduce the loss generation in superconducting materials when subjected to alternating current (ac).  One way to understand this is through complex ac magnetic susceptibility measurements.  A step-by-step characterization was done to determine the path formation of the precursors in the superconducting material formed from Y:Ba:Cu = 3:5:8 and was compared to the usual YBa2Cu3O7-x  (YBCO-123) by means of electrical, magnetic, and crystallographic measurements. Understanding this pathway of formation offers signicant information in preparing high-Tc YBCO. The AC magnetic susceptibility measurements correlated to morphological development, on the other hand offers a straightforward determination of how morphology and microstructure are improved after every heat treatment.

References:

  1. “Superconductivity: Present and Future Applications”, retrieved from http://www.superpower-inc.com
  2. Üses for Superconductors”, retrieved from http://www.superconductors.org

Link to the article: http://link.springer.com/article/10.1007/s10948-015-3202-7
Impact Factor: (2014/2015) 0.909

Justine Patricia L. Carpio and Percival F. Almoro
National Institute of Physics
College of Science
UP Diliman

Wavefront Watermarking of Technical and Biological Samples using Digital Random Phase Modulation and Phase Retrieval. Journal of Modern Optics, 61 (17): 1381-1386, 2014.

Catchy title of research: Hiding and decoding information using light

Watermarking of digital files facilitates ownership identification and authenticity verification. Various watermarking techniques have been developed as a response to the increased risk of malicious usage, manipulation and distribution of digital materials over the Internet.  A copyrighted file (or the host) is protected by hiding a digital signature (or watermark) onto it. Ideally, the watermark should be imperceptible so that it will neither interfere with the features of the host nor be detected by unauthorized persons. The watermark should also be permanently embedded, remaining robust against attacks to remove or destroy it. Digital watermarking has been demonstrated in various data formats: 1-D (e.g. texts), and 2-D (e.g. photographs).  To our knowledge, a technique for digital watermarking of data in 3-D format like object wavefronts via the phase retrieval approach has not been reported. For the first time, a technique to hide security watermarks within light wavefronts using a method based on phase retrieval and random phase modulation is demonstrated experimentally. The impact of this technique is in terms of enhanced optical data security which is a field of practical and theoretical significance.

Link to the article: http://www.tandfonline.com/doi/abs/10.1080/09500340.2014.935507#.VplIg5orKM8
Impact Factor: (2014/2015) 1.008

Mary Jane S. Apines-Amar, Karen Grace S. Andrino, Rowena E. Cadiz and Valeriano L. Corre Jr.
Institute of Aquaculture
College of Fisheries and Ocean Sciences
UP Visayas

Improved Resistance Against White Spot Virus (WSV) Infection in Tiger Shrimp, Penaeus monodon by Combined Supplementation of Peptidoglycan and Mannan Oligosaccharide (MOS). ELBA Bioflux, 6 (1): 1-8, 2014.

The combined supplementation of chitosan oligosaccharide (COS) and Bacillus coagulans in koi (Cyprinus carpio) not only enhanced growth but also significantly improved immune responses such as total leukocyte count (WBC) and respiratory activity (Lin et al 2012). Among the immunity parameters, the activation of the cellular component of the shrimp immune response such as the THC and the respiratory burst are considered sensitive indicators of immunostimulation. The respiratory burst is also carried out by shrimp immune cells to complement its cytotoxic ability. In addition to producing lytic enzymes, the shrimp immune cells also produce reactive oxygen intermediates (such as the superoxide anion, hydrogen peroxide, and other intermediates to degrade phagocytized agents) after which they are neutralized enzymatically to prevent damage to the host. Poor respiratory burst response can result in inability to kill phacocytized infectious agents.

Link to the article: 
Impact Factor: Not yet available

Oscar T. Serquiña Jr.
Department of Speech Communication and Theatre Arts
College of  Arts and Letters
UP Diliman

We Have Intimated Too Much of Ourselves to this City. Kritika Kultura, 25: 584-590, 2015.

This collection of poems is wrought from the everyday life in the city, as well as from the urban setting that engenders among its inhabitants feelings of ennui, abandonment, and loneliness. The three poems particularly provide “portraits” of the urban landscape whose overall constitution cannot be totally captured by what is visibly seen on its surface. A strong tension between admission and indirection may describe the general sensibility of these pieces. 

Link to the article: http://kritikakultura.ateneo.net/
Impact Factor: Not yet available

Divine Angela D. Genuino*, Kim Katrina P. Rivera and Mark Daniel G. de Luna
Environmental Engineering Engineering*
Department of Chemical Engineering
College of Engineering
UP Diliman

Ultrasonic Cleaning of Polytetrafluoroethylene Membrane Fouled by Natural Organic Matter. Journal of Membrane Science, 497: 450–457, 1 January 2016.

Chemical cleaning of membranes fouled by natural organic matter (NOM) generates secondary pollution. In this study, the effect of ultrasonic cleaning of polytetrafluoroethylene (PTFE) membrane fouled by precoagulated humic acid-bentonite mixture was investigated. Results show that chemical coagulation prior to microfiltration improved turbidity and TSS removals by 9.5% and 11.4%, respectively. Experimental data fitted to constant pressure filtration models determined the sequence of dominant fouling mechanism as follows: (i) membrane resistance-limited, (ii) pore blocking resistance-limited, and (iii) cake formation resistance-limited. Relative membrane permeability of 53 and flux recovery of 45% were achieved when continuous ultrasonic cleaning was done at a 2.0 cm probe distance, 25 min total cleaning time, 15 mg/L coagulant dose, and 15 W ultrasonic power. Ultrasonic cleaning was found to be more effective than hydraulic cleaning in terms of flux recovery. Compared to chemical cleaning, it is a competitive and safer alternative in mitigating NOM-induced fouling.

Link to the article: http://www.sciencedirect.com/science/article/pii/S0376738815301265
Impact Factor: (2014/2015) 5.056

Marie Antonette Junio-Meñez
Marine Science Institute
College of Science
UP Diliman

Biophysical and Genetic Connectivity Considerations in Marine Biodiversity Conservation and Management in the South China Sea. Journal of International Wildlife Law and Policy, 18 (2): 110-119, 3 April 2015.

A review of genetic and biophysical scientific studies establishes the critical importance of the offshore reefs in the South China Sea. These reefs are sources of larvae that sustain the fisheries productivity in the littoral states around the SCS. The contributions of the fishery sector, including income or employment, foreign exchange earnings, nutrition, and food security throughout the region, are well established. Coral reefs also provide other goods (e.g., raw materials and genetic resources) and ecological services (e.g., erosion prevention, disturbance modulation, and recreation). Recurrent reports on harvesting of endangered species such as giant clams and destructive fishing, together with massive reclamation and infrastructure development in different islands and reefs pose severe threats that have long-term negative impacts on the well-being of the future generations in the region. Concerted and sustained regional action is urgently needed. Without prejudice to territorial and jurisdictional issues, protection through a network of marine reserves and mitigation of human-induced threats to ecosystem health are important first steps in forestalling losses and irreversible damages. Regional collaboration in marine scientific research, utilization of the best available scientific information and experiences are essential in accelerating the recovery of degraded critical ecosystems and restore ecological integrity and resilience. Translation and promotion of science-based knowledge to inform policies and decisions at different scales of governance are likewise essential. Well-communicated science facilitates common understanding, which generates broad-scale public support, fosters cooperation among people and governments within the region and promotes appreciation of a regional commons without prejudice to national interests.  

Link to the article: http://www.tandfonline.com/doi/full/10.1080/13880292.2015.1044803
Impact Factor: Not yet available

Emma Ruth V. Bayogan, Angelyn T. Lacap and Leizel B. Secretaria
Department of Biological Sciences and Environmental Studies
College of Science and Mathematics
UP Mindanao

Postharvest Quality of Waxed and Wrapped Santol [Sandoricum koetjape (Burm.f.)Merr.] Fruit. Acta Horticulturae, 1088: 137-140, 30 June 2015.

Catchy title of research: Wrapping ‘Bangkok’ Santol Fruit Maintains Postharvest Quality in Ambient Better than Waxing

Santol is widely distributed in tropical Asia especially in Thailand, Indonesia and the Philippines. In 1999, more than 1.6 million productive trees were identified in the Philippines with an estimated production of 22 tons per hectare. The aril of santol fruit is known to be a good source of vitamins and antioxidants. Santol is usually consumed fresh. The yellowish to golden skin color of santol fruit is an important determinant of the quality. However, due to vulnerability to postharvest browning, fruit quality especially skin appearance rapidly decline. Therefore, more attention must be given to technologies that can lead to better quality maintenance of fruit in order to achieve consumers’ quality requirements and reduce losses. To this end, simple postharvest technologies such as the application of a commercial fruit wax and cling wrap were studied. We found out that cling-wrapped ‘Bangkok’ santol fruit maintained good visual quality and color longer while reducing decay and shriveling compared to waxed and control fruit. The commercial wax available in the Philippines, Fruit Gem (Makhteshim Chemical Works Ltd.), was not a suitable wax for use in santol fruit.

Link to the article: http://www.actahort.org/books/1088/1088_18.htm
Impact Factor: Not yet available

Manuel Joseph C. Loquias
Institute of Mathematics
College of Science
UP Diliman

Coincidence Indices of Sublattices and Coincidences of Colorings. Zeitschrift für Kristallographie – Crystalline Materials, 230 (12): 749–759, November 2015.

Catchy title of research: Coincidences of colorings of lattices

We use the properties of the coloring of a lattice Λ1 induced by its sublattice Λ2 to identify how the coincidence indices with respect to Λ1 and to Λ2 of a coincidence isometry of Λ1 are related. This leads to a generalization of the notion of color symmetries of lattices to what we call color coincidences of lattices.

Link to the article: http://www.degruyter.com/view/j/zkri.2015.230.issue-12/zkri-2015-1864/zkri-2015-1864.xml
Impact Factor: Not yet available

Nicole Niña G. Chavez, Rex Ferdinand M. Traifalgar, Jenny Vi M. Gonzaga and Valeriano L. Corre Jr.
Institute of Aquaculture
College of Fisheries and Ocean Sciences
UP Visayas

Growth Performance of Penaeus monodon Fed Diets Containing Water Hyacinth Leaf Protein Concentrate. ABAH Bioflux, 6 (2): 195-201, 2014.

Water hyacinth, an exotic species in the Philippines, has invaded natural bodies of water hampering the natural water-flow resulting to flashfloods during monsoon seasons. This study has demonstrated the optimum inclusion of HLPC as feed ingredient in shrimp diets, since this product can replace the commonly used shrimp feed ingredient, soybean meal. Water hyacinth leaf protein concentrate can replace 75 % dietary protein of soybean meal in formulated diets for P. monodon without adversely effecting growth and survival.

Link to the article: 
Impact Factor: Not yet available

Mark Daniel G. de Luna
Department of Chemical Engineering
College of Engineering
UP Diliman

Poly(oligoethylene Glycol Methacrylate): A Promising Electrolyte Polymer. Chang Mai Journal of Science, 42 (4): 868 – 876. October 2015.

In this work, the polymer electrolyte based on poly(oligoethylene glycol methacrylate) was studied and found to be a promising electrolyte polymer. The polymer was synthesized using conventional free radical polymerization and characterized using Fourier transform infrared spectroscopy and thermogravimetric analysis. Ionic conductivity was measured using impedance spectroscopy as a function of polymer type, iodine/iodide concentration, additive type and concentration, and polymer blend composition. The additives used in this study were TiO2 nanoparticles, propylene carbonate, g-butyrolactone, and 1-methyl-3-propylimidazolium iodide, whereas poly(ethylene glycol) and poly(vinyl alcohol) were used to prepare the polymer blends with poly(oligoethylene glycol methacrylate). It was found that the ionic conductivity of poly(oligoethylene glycol methacrylate) was about 40 times higher than that of commonly used polymers, such as poly(ethylene glycol) and poly(vinyl alcohol). This work thus demonstrates that poly(oligoethylene glycol methacrylate) is a good candidate to be used as an electrolyte polymer for a variety of electronic applications.

Link to the article: 
Impact Factor: (2014/2015) 0.371

Nathaniel S. Orillaza Jr.
Department of Orthopedics
College of Medicine
UP Manila

Functional Outcome After Treatment of Tuberculosis of the Upper Extremity. Acta Medica Philippina, 48 (4): 43-46, 2014.

This research is an initial report on the evaluation of function of the hand, wrist, elbow and shoulder of patients treated for tuberculosis infection of these body parts. While we are aware that tuberculosis is curable and surgery helps improve function, there are limited reports on the actual measurement of function and finding out factors that eventually affect the performance of activities of daily living. The paper showed that patients generally function well after treatment and may have more difficulties in activities requiring exertion. The next step of the research is to find out the specific patient and treatment factors that may predict eventual function.   

Link to the article: http://actamedicaphilippina.com.ph/content/volume-48-no-4
Impact Factor: Not yet available

Jerico B. Bacani and Julius Fergy T. Rabago
Department of Mathematics and Computer Science
College of Science
UP Baguio

On the Second-Order Shape Derivative of the Kohn-Vogelius Objective Functional Using the Velocity Method. International Journal of Differential Equations, 954836: 10 pages, 2015.

The exterior Bernoulli free boundary problem is formulated as follows: given a bounded and connected domain ⊂ R2 with a fixed boundary := Γ, we seek to find a bounded connected domain with a free boundary Σ that contains the closure of , Ā, and an associated real-valued (state) function defined on Ω (where Ω is the annulus formed by and ; refer to Figure 1) such that both unknowns and Ω satisfy the following boundary value problem:-Δ = 0 in Ω, = 0 on Σ,   = 1 on Γ, /n = λ on Σ where λ < 0.This problem can be reformulated into the Kohn-Vogelius-type cost functional JKV, which is defined as J(Ω) = JKV = and minimizing this functional over a class of admissible domains, where the two state functions and solve a homogenous Dirichlet () and non-homogenous Neumann () problem, respectively: (D):–ΔD = 0 in Ω, D = 0 on Σ and D = 1 on Γ; and (N): –ΔN = 0 in Ω, N = 1 on Γ, /n = λ on Σ where λ < 0.Our main objective is to compute for the shape Hessian of this cost functionalthrough an approach which has not yet been usedpreviously in solving a similar problem. That is, we use the so-called velocity method, wherein we consider non-autonomous velocity fields, to compute for the second-order shape derivative of the given cost functional.

Link to the article: http://www.hindawi.com/journals/ijde/2015/954836/abs/
Impact Factor: Not yet available

Hertz G. Balmater, Pearlyn C. Manalo, Carla B. Dimalanta, Juan Miguel R. Guotana, Noelynna T. Ramos and Betchaida D. Payot
National Institute of Geological Sciences
College of Science
UP Diliman

Paleomagnetism of the Samar Ophiolite: Implications for the Cretaceous Sub-equatorial Position of the Philippine Island Arc. Tectonophysics, 664: 214–224, 28 November 2015.

Catchy title of research: The site of formation of the 100 million years old oceanic crust and mantle rocks underneath the Samar Island

The study used paleomagnetic and geochronologic methods to determine the site and age of formation of the Samar ophiolite. It reports, for the first time, the paleolatitude of -14°±6° and K-Ar ages of 97.9±2.8Ma and 100.2±2.7Ma for the ophiolite. These results indicate that the Samar ophiolite formed at low southerly latitudes during the Late Cretaceous.

Link to the article: http://www.sciencedirect.com/science/article/pii/S0040195115005259
Impact Factor: (2014/2015) 2.872

Evelyn F. Delfin, Felicito M. Rodriguez and Erlinda S. Paterno*
Crop Science Cluster
Agricultural System Clusters*
College of Agriculture
UP Los Baños

Biomass Partitioning, Yield, Nitrogen and Phosphorus Uptake of PGPR Inoculated Tomato (Lycopersicum esculentum L.) Under Field Condition. Philippine Journal of Crop Science, 40 (2): 59-65, August 2015.

Catchy title of research: Differential response of tomato varieties to PGPR inoculation

A field study demonstrated the differential response of 10 open-pollinated (OP) and hybrid tomato varieties to plant growth promoting rhizobacteria (PGPR) inoculation under two levels of fertilization.  With PGPR inoculation, the total fruit yield of `Rossana´ and `Atlas´ varieties significantly increased by 27 and 19%, respectively.  Differences in varietal response to PGPR inoculation was further observed in terms of shoot dry matter yield wherein half of the entries tested had positive response, while the other half had reduced shoot dry weight with inoculation. Moreover, significant tomato variety-PGPR inoculation interaction on root dry weight was also observed. The increase in root dry weight due to inoculation also increased the root :shoot ratio of OP varieties, `Northern Red´ and `Improved Apollo´.  Higher root: shoot ratio was observed among tomatoes receiving half fertilizer rate due to higher root dry weight. In general, PGPR inoculation significantly increased the P concentration of the evaluated varieties from 0.20 to 0.21% P, with a 10% increase in P uptake among inoculated plants. Fertilization of tomatoes with the full recommended fertilizer dose increased yield by 28% relative to the harvest obtained from plants applied with half the recommended dose. The trial also showed that hybrids have higher yield than OP varieties. 

Link to the article: 
Impact Factor: (2014/2015) 0.170

Eulalio R. Guieb III
Department of Broadcast Communication
College of Mass Communication
UP Diliman

Violent Enclosures, Violated Livelihoods: Environmental and Military Territoriality in a Philippine Frontier. The Journal of Peasant Studies, 42 (2): 323-345, 2015.

Catchy title of research: When conservation and militarization converge: Violent enclosures and violated livelihoods in Palawan

When the governance of conservation territories converges with and reinforces enclosures, spaces can be controlled with authority and violence that places livelihoods at greater risk in context of uneven agrarian political economies – the outcomes of which reflect ‘violent enclosures’. This paper examines how indigenous resource users negotiate the discursive and material impact of environmental governance converging with militarized-insurgent spaces as overlapping enclosures in a protected area on Palawan Island, the Philippines. Drawing on local experiences, we examine how the livelihood vulnerability arising in the local political economy is exacerbated by access and use constraints from the overlapping enclosures of environmental and military governance in the buffer zone of Puerto Princesa Subterranean River National Park.

Link to the article: http://www.tandfonline.com/doi/abs/10.1080/03066150.2014.991718
Impact Factor: (2014/2015) 4.553

Eulalio R. Guieb III
Department of Broadcast Communication
College of Mass Communication
UP Diliman

Ang Dumaracol ng mga Kalamianen Tagbanua ng Hilagang Palawan: Isang Panimulang Paglalahad. Humanities Diliman, 11 (2): 31-60, July-December 2014.

Catchy title of research: “Hindi mamamatay si Dumaracol”: Paghahanap sa epiko ng mga Kalamianen Tagbanua

Ang pag-aaral na ito ang kauna-unahang dokumentasyon ng mahabang awit na Dumaracol ng mga Kalamianen Tagbanua ng hilagang Palawan, sa mga isla sa boundary ng mga bayan ng Taytay, El Nido at Linapacan.  Ang kasalakuyang papel ang una sa serye ng isang multi-stage na pananaliksik sa paghanap, pagrekord, pagdokumento, pag-transcribe, pagsalin sa wikang Filipino, at pagsuri sa di-kilalang Dumaracol.  Dahil panimulang pananaliksik, isang hakbang ang kasalukuyang pag-aaral upang ipakilala sa madla ang naturang awit. Si Dumaracol ang kinikilalang bayani ng mga Kalamianen Tagbanua.  Isinasalaysay ng naratibo ang buhay, pag-ibig at pakikidigma ni Dumaracol laban sa mga Moro tungo sa pagpapatatag ng kanilang mga pamayanan.  Ang tatalakayin sa papel ay ang isinalaysay na mga bersyon ng awit ayon sa kasalukuyang tumatayong lider ng mga Kalamianen Tagbanua sa bahaging ito ng hilagang Palawan na si Blas Juan ng Isla Pical ng Linapacan.  Ilalahad rin sa artikulo ang ilang aspekto ng prosesong pinagdaanan ng mananaliksik sa dokumentasyon ng awit na ito.  Tutukuyin rin sa papel ang ilang mahahalagang katanungang kakailanganing sagutin sa patuloy na pagbubuo ng Dumaracol.  

Link to the article:
Impact Factor: Not yet available

Francisco B. Elegado
BIOTECH
UP Los Baños

Traditional Dried Starter Culture (Medombae) for Rice Liquor Production in Cambodia. International Food Research Journal, 22 (4): 1642-1650, 2015.

Catchy title of research: Characteristics of Cambodian starter culture and rice wine produced

The traditional Cambodian starter culture called ‘medombae’, similar to the Philippine ‘bubod’ which is used for rice wine making, was studied. The traditional method of ‘medombae’ processing was described.  Its main ingredients are rice flour, herbs and spices and portion of previous batch of ‘medombae’ containing the microorganisms. Using standard pour plating techniques, the major microbial composition are around 1,000,000 molds, 10,000,000 yeasts and less than five (5) acid-forming bacteria counts for every gram of the starter culture.  The rice wine produced had lower alcohol content,  and lower yield and poor  sensory properties compared to those prepared using Vietnamese starter cultures. 

Link to the article: 
Impact Factor: Not yet available

Maria Teresa M. Perez and Francisco B. Elegado
BIOTECH
UP Los Baños

Bacteriocins from Lactic Acid Bacteria: A Review of Biosynthesis, Mode of Action, Fermentative Production, Uses, and Prospects. International Journal of Philippine Science and Technology, 8 (2): 61-67, 2015.

Catchy title of research: Recent knowledge on the natural antimicrobial proteins of lactic acid bacteria

In order for bacteria to survive in an environment where there are many other competing bacteria, they produce antimicrobial agents like toxins, antibiotics, bacteriocins, organic acids, among others. Unlike most antibiotics, bacteriocins are antibacterial proteins and thus they can be degraded in the digestive system and thus pose no danger of liver or kidney intoxication.   Lactic acid bacteria are generally regarded as safe since they are naturally occurring in fermented foods and have been used in the manufacture of sausages, yoghurt, cheese and probiotic drinks. Thus, bacteriocins of lactic acid bacteria have gained much interests for possible applications as natural and safe food preservatives against specific food pathogens and as possible alternative or supplements to antibiotics against drug resistant  bacterial strains. One of the exciting prospects is bioengineering or the use of recombinant DNA technology on bacteriocin production to increase antimicrobial activity, increase the amount of bacteriocin produced by lactic acid bacteria and further specify which pathogen to target.  The classification, production and present commercial application on food preservation and animal health application and recent scientific knowledge gained abroad and in the Philippines  are discussed in this article.  Local researchers are challenged to discover new bacteriocins, apply recent tools on bioengineering and  process engineering for enhanced bacteriocin production and action, and do research on their novel  applications.

Link to the article: 
Impact Factor: Not yet available

Mark Nell C. Corpuz*, Vachel Gay V. Paller and Pablo P. Ocampo
Limnological Research Station*
Institute of Biological Sciences
College of Arts and Sciences
UP Los Baños

Environmental Variables Structuring the Stream Gobioid Assemblages in the Three Protected Areas in Southern Luzon, Philippines. Raffles Bulletin of Zoology, 63 : 357-365, September 2015.

There is no information on how different environmental and habitat factors can influence the gobioid assemblage structure from protected areas with limited human accessibility. Hence, the aim of this paper was to evaluate gobioid assemblages in three streams located in different nationally proclaimed Protected Areas. We also want to analyse the contribution of environmental variables in structuring the gobioid assemblages along the longitudinal gradient profile of the three streams. The study collected a total of 1,071 specimens belonging to 19 species, and 17 genera. Twelve gobiids and seven eleotrids were recorded from the three rivers. Four gobioid species comprised 57.17% of the total abundance. These were Giuris margaritacea (Eleotridae), Glossogobius celebius (Gobiidae) Bostrychus sinensis (Eleotridae) and G. giuris (Gobiidae) (in order of importance). Multivariate analyses revealed the gobioid assemblage variability as a response of species abundance to stream gradients. Species variation along the longitudinal stream gradient profile (upstream and downstream dwellers) was also emphasized. From the 19 environmental variables, It was recognized that substratum types, distance to sea, and land use pattern are the most important causative environmental parameters influencing the gobioid assemblages. Similarity analysis using species and abundance data registered low similarity percentages (18–40%) between the three rivers, validating the high species turn over

Link to the article:
Impact Factor: (2014/2015) 1.024