UPV Digital RepositoryUPV-DRUniversity of the Philippines Visayas
 

UPV Theses and Dissertations

Permanent URI for this communityhttps://hdl.handle.net/20.500.14583/10

Browse

Filters

2004 - 200912010 - 20152

Settings

Committee Chair: search.filters.chair.Tayo, Gilma T.Keyword: search.filters.keyword.Community structure

Search Results

Now showing 1 - 3 of 3
  • Thumbnail Image
    Item
    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.
  • Thumbnail Image
    Item
    Abundance, distribution, and composition of macrobenthos in Banate Bay, Iloilo, Philippines
    Bernasol, Mylin M. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2015-06)
    In order to characterize the macrobenthic community in Banate Bay, quarterly sampling was done from December 2012 to December 2013 in nine (9) stations of the study area. Samples were collected using a hand-held mud corer measuring 0.15m in diameter. Samples were sieved in the field using a 0.5mm mesh, preserving all retained organisms in a plastic container containing 10% buffered formalin with Rose Bengal dye. Two (2) replicate samples per station in June and September 2013 were processed in the laboratory. A total of 38 taxa were sorted and identified with overall mean density of 821 ind/m2. Cluster Analysis using the program COMM grouped species according to their abundances and stations based on their relative location from the shore. T-test for 2 sample means showed that densities in June and September did not differ significantly (p=0.42). ANOVA showed that densities per station did differ significantly (p=0.05). Correlations identified salinity, dissolved oxygen, turbidity, and organic matter content to have negative effects on macrobenthos density in the Bay. In spite of low density, diversity particularly of polychaetes appeared to be relatively high. This can be attributed to the intensity and fluctuations of the harsh environment in the Bay still being within limits.
  • Thumbnail Image
    Item
    Echinoid and Ophiuroid species in Taklong Island National Marine Reserve (TINMR), Guimaras
    Almira, Eugenie Marie A. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2015-06)
    Taklong Island National Marine Reserve (TINMR) in Guimaras is one of the Philippines’ marine protected sites established to ensure continuity and productivity of marine organisms such as echinoderms. The study aims to determine the community structure of echinoid and ophiuroid species in selected shallow coastal sites around Taklong Island within TINMR. Sampling was done twice (June 2014 and Jan 2015) using belt transect method for echinoid species in three selected sites and random quadrat method for ophiuroid species in two sites. A total of twelve (12) echinoid and six (6) ophiuroid species were recorded. The most numerous echinoid and ophiuroid were Echinotrix calamaris and Ophiocoma erinaceus, respectively. The diversity of echinoids (H’= 0.37-0.95) and ophiuroids (H’= 0.53-1.40) in Taklong Island was relatively low. Presence and abundances of many echinoids and ophiuroids in a site varied with sampling time. Variation may be due to differences in substrate characteristics such as sea grass cover and coral cover as well as environmental factors.