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Undergraduate Special Problem

Permanent URI for this collectionhttps://hdl.handle.net/20.500.14583/30

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    Community structure, biomass and carbon stock assessment of mangrove forest in Poblacion, Batan, Batan Bay, Aklan, Philippines
    Cagalawan, Donna Novei C. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2013-04)
    The continued loss of mangroves in Batan Bay, Aklan and elsewhere in the Philippines warrants urgent attention. Appropriate management schemes can only be drawn after a scientific assessment of the remaining mangroves in a given area. This study aimed to 1.) assess the community structure, of mangroves in Poblacion, Batan, Aklan using accepted ecological indicators such as a.) determine the physical and chemical factors such as salinity, temperature of water and soil, pH as well as substrate characterization; b.) identify and classify true mangrove species present in the area; c.) Stand Basal Area, d.) stems per hectare, e.) relative density, f.) relative frequency, g.) relative dominance, h.) importance value, i.) Shannon Index of Dominance and; 2.) determine biomass and carbon density in the above ground pools of mangroves. A total of nineteen (19) true mangrove species represented by six families were identified in Poblacion, Batan, Aklan. The true mangrove species were Aegiceras corniculatum, Avicennia alba, Avicennia marina, Avicennia officinalis, Avicennia rumphiana, Bruguiera cylindrica, Camptostemon philippenensis, Ceriops decandra, Excoecaria agallocha, Lumnitzera littorea, Nypa fruticans, Osbornia octodanta, Rhizophora apiculata, Rhizophora mucronata, Rhizophora stylosa, Scyphiphora hydrophyllacea, Sonneratia alba, Xylocarpus granatum and Xylocarpus moluccencis. Camptostemon philippenensis had the highest basal area with 103.14 m2/ha and the highest relative dominance with the value of 39.26%. Avicennia marina has the highest stems per hectare in the area with the value of 32, 400. It also recorded the highest average density at 167 trees/ha and was present in all plots with relative frequency of 44.15%. Avicennia marina was the most important species with value of 300.21. Camptostemon philippinensis had the highest seedling density of 586 seedlings per hectare, whereas Avicennia marina had the highest sapling density of 20 saplings per hectare. In terms of biomass, Avicennia marina recorded the greatest biomass at 79.42 tons/ ha and the highest carbon stock of 36.7 tons/ha. A total of 203.87 tons/ha biomass and 91.728 tons/ha carbon stock was determined. Based on the leaf litter fall, Transect 1 has the highest leaf fall at 664.9g.m2. Litter production was highest during November 5, 2012-November 19, 2012 and lowest in December 17, 2012- December 31, 2012 in all three transects.
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    A study of the gut contents of compressed tubby (Canthigaster compressa) from Talibon, Bohol and Palompon, Leyte, Philippines
    Caduada, Laymart A. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2017-06)
    The Philippines has one of the longest coastlines and is among the top producers of fisheries products in the world. The industry however is threatened by unsustainable fishing practices and dwindling resources. Proper fisheries management is hindered by an extensive lack of biological information on resource populations. Studying fish feeding habits based on gut content analysis could provide insights on fish feeding patterns and trophic interactions in aquatic food webs and enhance our understanding of exploited resources. The study compares the composition of the gut contents of Canthigaster compressa caught by sled trawl in seagrass beds in Talibon, Bohol and Palompon, Leyte. Sixty eight specimens from Talibon and 80 from Palompon were examined. Chyme made up 70-76% of the total gut contents in both areas. A total of 23 prey items were observed. Diet composition in Palompon was more diverse as compared to Talibon. Gut contents changed with size/age, with an apparent increase in the proportion of seagrass/algae as fish size increased. This suggests that the tubby shifts to a more herbivorous diet as they grow older. The amount of forams in the guts also decreased with size which could be attributed to a shift in habitat from seagrass to coral reefs. The results also show that crustaceans are more abundant in Palompon than in Talibon which could mean that Palompon has a richer seagrass-associated crustacean population. Further studies about the abundance of crustaceans in the fish diet in Palompon and Talibon is encouraged as it could be useful in assessing the ecological conditions of the areas.