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    Mangrove community structure survey in Barangay Guisi and Linayasan, Altavas, Aklan
    Bullo, Gliford G. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2004-04)
    The mangrove forest is a complex and unique community of medium to large tress, shrubs, vines and palms, oddly thriving with luxuriant growth in the least inviting habitats which have the barest and limited conditions for the growth and survival of higher plant life. This study aims to assess the community structure of mangroves in Barangay Guisi and Linayasan, Altavas, Aklan using accepted ecological indicators. The sampling site, Altavas, Aklan is located at the upper median of Panay Island. There was a total of 15 true mangrove species belonging to the 9 families in the area. The nine families are Family Myrsinaceae represented by Aegiceras corniculatum, Family Avicenniaceae represented by Avicennia alba, Avicennia marina, Avicennia officinalis and Avicennia rumphiana; Family Rhizophorceae represented by Rhizophora apiculata, Rhizophora mucronata, Bruguiera gymnorrhiza and Bruguiera parviflora; Family Bombacaceae represented by Camptostemon phihppensis; Family Rubiaceae represented by Scyphiphora hydrophylaceae; Family Meliaceae represented by Xylocarpus granatum and Family Palmae represented by Nypa fruticans. Avicennia rumphiana has the highest mean basal area of 23.21 (m2/ha), while Xylocarpus granatum had the lowest mean basal area of 0.01 (m2/ha). Avicennia rumphiana has the highest relative density of 57, while Xylocarpus granatum has the lowest relative density with a value of 1. Avicennia rumphiana and Avicennia officinalis had the highest relative frequency of 19.8667 Aegiceras corniculatum, Excoecaria agallocha, Scyphtphora hydrophylaceae and Xylocarpus grunatum on the other hand had the lowest relative frequency of 0.4. Avicennia rumphiana is the dominant species with a relative dominance value of 23.66, and Xylocarpus granatum is the least dominant species with relative dominance value of 0.01. Avicennia rumphiana is the most important species in the area with an importance value of 127.1816, and the least important species, as observed, is Xylocarpus granatum with an importance value of 1.685863. The index of diversity is 0.918655 for the entire area.
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    The community structure of mangroves in Barangay Poblacion and Barangay Pinamuk-an, New Washington, Aklan
    Blanco, Florence T. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visaya, 2004-04)
    Mangrove ecosystems presently cover an area of about 20 million hectares worldwide. Mangroves grow in environmental settings ranging from highly humid to extremely arid conditions, and in soils which range from pure clays to peat, sand or coral rubble. This study was conducted to assess the community structure of mangroves in Barangay Poblacion and Barangay Pinamuk-an, New Washington, Aklan, using the transect line method of English et al (1995). Specifically, it aimed to determine selected physical and chemical factors such as salinity, pH, temperature for water and soil as well as characterization of substrates; to identify and classify true mangrove species present in the area; to describe the community structure in terms of stand basal area, stems per hectare, relative density, relative frequency, relative dominance, importance value, shannon index of diversity, zonation patterns, seedling and sapling density. No study had been conducted to document the community structure of mangroves in New Washington, Aklan. This study was done to provide these vital information needed for its proper management. Five stations were selected in Barangay Poblacion and Barangay Pinamuk-an, New Washington, Aklan. Twenty-two (22) species of mangroves were identified belonging to nine (9) families: Avicenniaceae -Avicennia alab, A marina, a officinalis, A rumphiana; Bombaceae - Camptostemon philippinensis; Combretaceae - Lumnitzera littorea, L racemosa; Euphorbiaceae - Exoecaria agallocha; Meliaceae - Xylocarpus granatum, X moluccensis; Myrsinaceae - Aegiceras corniculatum; Myrtaceae - Osbornia octodonta; Palmae - Nypa fruticans; Rhizophoraceae - Bruguiera cylindrica, B parviflora, Ceriops decandra, Rhizophora apiculata, R mucronata; Rubiaceae-Scyphiphora hydrophyllacea; Sonneratiaceae -Sonneratia alba, S caseolaris; Sterculiaceae-Herittiera littoralis. The study area had a water salinity of 6 ppt to 25 ppt ; water temperature of 27 °C to 30 °C ; soil temperature 27°C to 29°C ; water pH 2.29 to 7.80; soil pH 6.30 and 7.59. Basal area ranged from 0.008 m2/ha for Bruguiera parviflora to 114 nr/ha for Sonneratia alba The species with the highest average stems per hectare recorded was Avicennia rumphiana with 3320. The species with the highest average density recorded was Avicennia rumphiana with a value of 54.984. The station with the highest density was Station 3 and 4 while Station 1 and 5 had the lowest. Two species had the highest Relative Frequency. Xylocarpus granatum and Sonneratia alba were in all stations with 100% occurrence. From the 22 true mangrove species recorded, Avicennia rumphiana had the highest relative dominance of 462.30; the least was Bruguiera parviflora (0.06). The most important species was Avicennia rumphiana (118.51) while the least was Sonneratia caseolaris (1.23). The area is considered to be highly diverse at 0.7835. While on a per plot basis, Station 5 had the highest at 0.9439 while least at Station 1 with 0.5709 Index of Diversity.
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    A community study of mangroves in Brgy. Caliling, Cauayan, Negros Occidental
    Barredo, Sherry Marie P. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2000-03)
    The species distribution of the mangrove community in Brgy. Caliling, Cauayanz Negros Occidental was studied using the transect line plot method with three plots for each of four stations established. Both stations 1 and 4 were located landward, while stations 2 and 3 were located seaward. Community structure Is described in terms of the following parameters; basal area, number of trees per hectare, importance value, relative density, relative frequency, frequency of species and relative dominance. Variations in these parameters are correlated with physico-chemical factors such as the air, water and soil temperature, water depth, salinity and pH. Ten true species were found In the mangals of the coastal environment of Brgy. Caliling, Cauayan, Negros Occidental. They were Avicennia aiba, Avicennia Janata, Avicennia manna, Campostemon phiiHpinensis, Excoecaria agallocha, Osbomia octodonta, Nipa fruticans, Brugeria cylindrica, Rhizophora apiculata and R. mucronata. Standard Basal Area was highest in Station 3 with 7.54 m/ha. In terms of zonation, the landward zone was found to have the highest Stand Basal Area with 11.15 m/ha. Station 2 had the highest density value of 33.92 %, whereas in terms of zonation, both the middle and seaward zone had the density value of 36.20 %. Avicennia marina was found to be the most dominant species and was observed to occupy sites with hypersaline conditions, in silty clay to muddy substratum, which may or may not be inundated by tidal flow most of the time.