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UPV Theses and Dissertations

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Adviser: search.filters.advisor.Sabada, Resurreccion B.AGROVOC Keyword: search.filters.agrovoc.species diversity

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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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    Community structure of beach forest species in Mag-aba, Pandan, Antique
    Banogon, Tharrah Anne O. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2019-06)
    The Philippine beach forest is one of the understudied and less-popular important ecosystem that provides great number of food and economic products in the country. In fact, we lost them much earlier than the mangrove community that there is miniscule information is existing about them. There is a need for understanding the forest status and community structure due to the rising threats of natural and anthropogenic factors. The unexplored forest patch in Barangay Mag-aba, Pandan, Antique can provide additional information on beach forest diversity and abundance in the country, thus the need for this study. This study aimed to record the different species and to provide description of the community of beach forest in Mag-aba, Pandan. Specifically, the objectives of this study are (1) identify, describe and classify the beach forest species present in the area, and (2) describe the community structure in terms of species composition, diameter at breast height and stand height, stand basal area, importance value, evenness and Shannon- Weiner Index of Diversity. The transect plot method adopted from English et al (1994) was used to obtained quantitative data. A total of 80 beach forest species representing 41 families were recorded. The family Fabaceae and the species Cocos nucifera dominated the forest community. The stand basal area of 83.24 m2 ha-1 reflects a mature beach forest community, however the community is made up of mostly low DBH classes (saplings and seedling) also indicating a regenerating forest. Mag-aba is characterized to have a low species diversity (H'=1.17), however the individual species are fairly distributed (J'- 0.83). These results are addition to the existing knowledge of beach forest community that would serve as information for conservation measures.
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    Floristic composition and diversity of mangroves in selected sites in the province of Antique, Panay Island, Philippines.
    Balinas, Lucelle V. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2006-03)
    Mangroves in the Philippines are in constant danger due to innumerable disturbances in the environment. The study endeavored to assess the floristic composition and diversity of the mangroves in the province of Antique through transect and ocular survey in the randomly selected sites throughout the province. Diversity in the region is high with the presence of 3 1 true mangrove species represented by 16 families and 14 genera. The species include Acanthus ebracteatus, A. ilicifolius, and A. volubilis from Family Acanthaceae, Avicennia alba, A. marina. A. officinalis, and A. rhumphiana from Family Avicenniaceae, Camptostemon philippinensis from Family Bombaceae, Lumnitzera littorea and Lumnitzera racemosa from Family Combretaceae, Excoecaria agallocha from Family Euphorbiaceae, Pemphis acidula from Family Lythraceae, Xylocarpus granatum and Xylocarpus moluccensis from Family Meliaceae, Aegiceras corniculatum and Aegiceras floridum from Family Myrsinaceae, Osbornia octodonta of Family Myrtaceae, Nypa fruticans of Family Palmae, Bruguieria cvlindrica. B. gymnorrhiza, and B. sexangula, Ceriops decandra, C. tagal, Rhizophora apiculata. R. mucronata and R. stylosa from Family Rhizophoraceae, Scyphiphora hydrophvllaceae from Family Rubiaceae, Sonneratia alba, S. caseolaris and S. ovata from Family Sonneratiaceae, and Heritiera littoralis from Family Sterculiaceae . The Shannon Index of Diversity used to determine the measure of diversity in the area is correlated with Pielou's Equitability Index for Evenness. The measures of indices showed that diversity and evenness of the mangal area in the province are directly related, with values of 0.73232 and 0.51163, respectively. Caluya showed the highest diversity index of 1.0132, which consisted of 28 species from 13 families and 15 genera, while Bugasong has a relatively low diversity of 0.0486, denoted by 6 species from 4 families and 4 genera. In general, the high variations in the geomorphology of coastal areas in Antique provided a wide range of substrata for colonization of mangroves that contributed to the high species diversity.