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    Mangrove community structure survey in Pedada Bay, Ajuy, Iloilo
    Bravo, Mark G. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2004-04)
    Mangroves are uniquely tropical, globally occurring and one of the most pervasive coastline ecosystems. They are one of the highly productive and one of the most diverse wetlands on earth. The objective of this study is to assess the community structure of mangroves in Pedada Bay, Ajuy, Iloilo, in particular the species composition and diversity in relation to the physical and chemical factors. Pedada Bay is located in the northern part of Panay Island. The transect line plot method was used to survey the community structure of the mangroves. The floristic composition of Pedada Bay was composed of a total of 18 true mangrove species belonging to 11 families. The true mangroves were Family Avicenniaceae represented by Avicennia marina and A. rumphiana, Family Bombacaceae represented by Camptostemon philippinensis, Family Combretaceae represented by Lumnitzera racemosa, Family Euphorbiaceae represented by Exoecaria agallocha, Family Meliaceae composed of Xylocarpus granatum and X. moluccensis, Family Myrsinaceae composed of Aegiceras corniculatum and A. floridum, Family Myrtaceae represented by Osbornia octodonta, Family Palmae represented by Nypa fruticans, Family Rhizophoraceae composed of Bruguiera cylindrica, Ceriops decandra, Rhizophora apiculata, R. mucronata, and R. stylosa, Family Rubiaceae, composed of Scyphiphora hydrophyllacea, and Family Sonneratiaceae, composed of Sonneratia alba. Average basal area for the entire Pedada Bay ranges from 300.564 m2/ha for Sonneratia alba to 0.008 m2/ha for Rhizophora mucronata. Average stems per hectare ranges from 1,988 for Avicennia marina to 5 stems per hectare for Aegiceras corniculatum. Of the three barangays of Pedada Bay, Barangay Pedada had the highest basal area while Barangay Luca had the lowest basal area. Sonneratia alba was the most dominant species in the bay. Avicennia marina was the densest, the most frequently occurring, and the most important species in Pedada Bay. The entire area had a high diversity index of 0.718. A distinct zonation pattern was observed in the area. Seedling density ranges from 1,421 seedlings for Sonneratia alba to 1 seedling for Scyphiphora hydrophyllacea. Sapling density ranges from 166 for Avicennia marina to 1 for Scyphiphora hydrophyllacea.
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    Identification of intertidal fungi from mangroves in Iloilo River
    Bonifacio, Jo F. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2002-04)
    This study aims to describe, identify and classify intertidal fungi through direct examination of the collected mangrove wood samples in Iloilo River, Iloilo City, Philippines. This will provide additional information about the occurrence of fungi in estuarine environments. One hundred samples of decayed but attached roots and stems of unidentified mangroves were collected in each of the intertidal zone of the three study sites (Study Site I: Sooc, Oton, Iloilo; Study Site II: Dulonan, Arevalo, Iloilo City; Study Site III: Diversion River, near Marina Restaurant) in Iloilo River. In Study Site 1, The total number of species collected was 11, 4 of which belong to Phylum Ascomycota, 2 belong to Phylum Deuteromycota and 5 belong to Phylum Basidiomycota. In Study Site II, there were 10, 6 belong to Phylum Ascomycota, 3 to Phylum Deuteromycota and 1 to Phylum Basidiomycota and in Study Site III, total number of species was 14, 7 belong to Phylum Ascomycota, 4 to Phylum Deuteromycota and 3 to Phylum Basidiomycota. The total number of species of fungi collected in the three study sites were 20 (8 ascomycetes, 7 basidiomycetes, and 5 deuteromycetes). The frequently occurring fungi (10-29 % fiequency of occurrence) are Eutypa sp. (15.3%), followed by Periconia prolifica (13 %) and Verruculina enalia (10.3%). The remaining 17 species were collected infrequently (<10 % fiequency of occurrence). The ascomycetes were the most dominant group of fungi collected in this study.
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    The community structure of mangroves in Ivisan, Capiz
    Bermoy, Gian Carlo A. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2004-04)
    The structure of the mangrove community in Ivisan, Capiz was studied using the transect line plot method with fifteen plots established. This study aims to assess the community structure of mangroves in Barangay Agustin Navarra and Barangay Balaring, Ivisan, Capiz using accepted ecological indicators. Community structure is described in terms of the following parameters: basal area, stems per hectare, relative density, relative frequency, relative dominance, importance value of the species, and the Shannon Index of Diversity. Variations in these parameters are correlated with certain physico-chemical factors such as air and water temperature, soil pH, and water salinity. Little study has been done to document the mangroves in Barangay Agustin Navarra and Barangay Balaring, Ivisan, Capiz. This is the first systematic study done in the area; thus, the present study will provide vital information needed for its proper management. A total of nineteen true mangrove species represented by ten families were identified on Barangay Agustin Navarra and Barangay Balaring, Ivisan, Capiz. The true mangroves consisted of Aegiceras corniculatum, Avicennia alba, Avicennia marina, Avicennia officinales, Avicennia rumphiana, Bruguiera cylindrica, Bruguiera parviflora, Camptostemon philippinensis, Ceriops decandra, Exoecaria agallocha, Nypa fruticans, Osbornia octodonta, Rhizophora apiculata, Rhizophora mucronata, Rhizophora stylosa, Sonneratia alba, Scyphiphora hydrophyllacea, Xylocarpus granatum and Xylocarpus moluccensis. All the species were present in Station 1 except Scyphiphora hydrophyllacea. The species present in Station 2 and in both stations were Avicennia marina, Avicennia rumphiana, Exoecaria agallocha, Osbornia oclodonta, Rhizophora apiculata, Rhizophora mucronata, Scyphiphora hydrophyllacea, and Sonneratia alba. Avicennia marina has the overall highest relative density of 340 trees per hectare, relative frequency of 22%, relative dominance of 266.655%, and importance value of 628.841%. Seedlings and saplings of Avicennia marina dominate the area indicating that the mangrove community is young and regenerating stand. Barangay Agustin Navarra has the highest index of diversity of 0.87 while Barangay Balaring has an index of diversity of 0.47. The overall index of diversity is 0.674.
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    Community structure of riverine mangrove stand in Brgy. Talokgangan, Municipality of Banate, Iloilo Province
    Belaño, Keith Dominador L. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2001-04)
    The community structure of riverine mangrove stand in Brgy. Talokgangan, Municipality of Banate, Iloilo was studied. Ten “true” mangrove species representing seven families were encountered in the “mangals” of Balandra creek community in Brgy. Talokgangan. They were Avicennia marina, Avicennia lanata and Avicennia alba representing Family Avicenniaceae; Rhizophora apiculata and Rhizophora mucronata under Family Rhizophoraceae; Sonneratia alba of the Family Sonneratiaceae; Excoecaria agallocha under Family Euphorbiaceae; Camptostemon philippinense of the Family Bombacaceae; one from the Family Meliaceae namely Xylocarpus granatum, and Family Palmae represented by Nypa fruticans. Stand Basal Area was computed highest in Station 1 with 10.22 m2/ha. Station 1 was also the densest among the four stations with a density value of 2533 trees/ha. In terms of data evaluated per zone, the landward zone has a Stand Basal Area of 10.87 m2/ha which is slightly higher than the middle and riverward zones. The middle zone, however, was found to be the densest with 1850 trees/ha. The most dominant station was Station 1 with the highest Index of Dominance of 0.3319, however, was found to be the least diverse station. The highest Index of Diversity was computed in Stations 2 and 3, with diversity indices of 0.8976 and 0.8989 respectively. Avicennia marina was found common in all stations and the most dominant, making it the most important mangrove species. They were found to occupy the whole site, growing abundantly in wide range of conditions from areas frequently inundated by tidal flow in Station 1 to the firmer muddy substratum in the back mangrove areas. Rhizophora apiculata and Rhizophora mucronata was observed to occupy waterlogged soil conditions. Excoecaria agaliocha tend to flourish in firmer muddy substratum in open sites, whereas, Xylocarpus granatum was observed to occupy zones where salinity is lowest in areas rarely affected by tidal flow. Sonneratia alba and Camptostemon philippinense tend to grow in zones directly inundated by tidal flow.
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    Willingness-to-pay for the conservation of mangrove site in Dumangas, Iloilo
    Agapito, Arianne I.; Guadalupe, Ronell D. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2011-03)
    This study was designed to determine the willingness-to-pay of the residents of Dumangas, Iloilo for the conservation of the existing mangrove sites in their area. Data were gathered through personal interviews using an interview schedule among 240 household representatives equally distributed in six barangays: three coastal, three noncoastal. Results of the study showed that most of the study participants were aware and knowledgeable about the existence of mangroves, its uses and benefits. The popular barangays identified to have mangrove sites included Sapao (31.33%) and Ermita (32.92%). Using dichotomous choice willingness-to-pay method with randomly assigned bid prices, results showed that most of the study participants both from coastal (89.17%) and non-coastal barangays (91.67%) were willing to pay for the conservation of mangroves. The main reason cited was that they want to participate in programs by the local government that aims to conserve the environment. When adjusted to level of certainty, there was slight difference in the number of study participants who were willing-to-pay; mean willingness-to-pay amounted to Php 86.47 without adjustment to level of certainty and Php 76.17 when adjusted to level of certainty. Knowledge index rating, civil status and bid price were the significant factors that affect the willingness-to- pay without adjustment to level of certainty at 5% level of significance. When adjusted to level of certainty, knowledge index rating (5%) and bid price (1%) were the significant factors. Annual surcharge in Community Tax is the preferred payment vehicle of the study participants for the conservation.