Volume 24 No. 2 July – December 2002

Erlinda A. Vasquez and Melecio A. Buyser ABSTRACT Yam scale, Gonaspidiotus hartii Cockerell, is one of the most important insect pests attacking stored yam in the Philippines. In this study, G. hartii was investigated on greater yam Dioscorea data (var Kinampay). The insect underwent three developmental stages: egg, nymph and adult, The total developmental period …

Life history of yam scale, Gonaspidiotus hartii Cockerell (Hemiptera:Diaspididae) Read More »

Zosimo M. de la Rosa ABSTRACT The study was conducted on six adjacent upland farms usually planted to native corn under a few old coconut trees. The site had a slope ranging from 9 – 17% and had a clayey soil. The following were the objectives of the study: a) to determine the feasibility of …

Mora grass in contour hedgerow: A technology for a sustainable upland farming system Read More »

Teofanes A. Patindol ABSTRACT The study was conducted to describe the hunting pattern and determine the factors associated to hunting pressure inside protected areas in Leyte. The primary motivation to hunt inside protected areas is for both subsistence and commercial use. Because of low economic opportunities, hunting respondents hunt despite legal restrictions to augment income. …

Hunting pattern and pressure of communities inside protected areas in Leyte Read More »

C. M. Orofeo, R. U. Cruzet, M. P. B. Kindica, B. Zuidberg and K. Karremans ABSTRACT An existing stereoscopic technique employing neural networks has been used to measure the length of fishes. Prior to the actual measurements, certain parameters that might affect the accuracy of the measurement were investigated. The influence of the index of …

Fish length measurements using artificial neural networks Read More »

Joie D. Matillano ABSTRACT The fish fauna of Lake Manguao was investigated during two sample events last June and September 2002. The study was conducted in order to ascertain whether the unique fish fauna first catalogued by Day (1914) and later by Davies and Green (1990) is still present in the lake after the introduction …

The Ichthyofauna of Lake Manguao, Taytay, Palawan, Philippines Read More »

Dorothy G. Lacuna ABSTRACT The presence of UV-absorbing rnycosporine-like amino acids (MAAs) from nine planktonic calanoid copepod species were investigated. MAA concentrations from methanol extracts of adult females were analyzed by High Performance Liquid Chromatography (HPLC). A total of 4 MAAs were identified, namely mycosporine-glycine, palythine, porphyra-334 and shinorine. Although all the experimental copepods had …

Survey of ultraviolet radiation-absorbing mycosporine-like amino acids in adult females of planktonic copepods Read More »