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Undergraduate Special Problem

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

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Committee Chair: search.filters.chair.Nievales, Marie Frances J.SDG: search.filters.sdg.SDG 14 - Life below water

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    Phytosociological study in Garantiangan Island, Taklong Island National Marine Reserve (TINMR), Nueva Valencia, Guimaras, Philippines
    Calesterio, Krizha Marie C. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2018-12)
    Each island has a unique set of characteristics attributed to differences in size, isolation, relief and climate, and origin. Such characteristic influence their floristic composition. Rapid development of tropical islands due to expansion of tourism thus put the flora under risks. In addition, the impact of climate change is also a big factor. There is a need to do baseline studies for proper management and conservation purposes. This study was conducted in Garantiangan Island (a part of Taklong Island National Marine Reserve) in Nueva Valencia, Guimaras, Philippines to assess the species composition, and community structure of flora present. Data were collected by establishing random plots from August 2016 to February 2017. Results showed a total of 45 species (7 unidentified) belonging to 26 families, were recorded. Rubiaceae was the most dominant family, having five representative species. Invasive species found were Leucaena leucocephala, and Lantana camara. Floras found belonged to two types of vegetation namely; littoral vegetation: herbaceous strand, littoral shrubland and littoral forest zone and mangrove vegetation. Total stand basal area was 16.63 m2 ha- 1 , with 4985.71 stems ha-1. The total seedling density (1943 individuals ha- 1) > total sapling density (1686 individuals ha- 1) > total tree density (1343 individuals ha- 1) suggests “good” regeneration status. 1. Tarenna littoralis had the highest relative density (18.05%) and frequency (8 %). Terminalia foetidissima had the highest relative dominance (26.70%) and was the most important species (37.04 %). Shannon-Weiner diversity index and Simpson evenness index values recorded were 1.33 and 0.89, respectively, which suggests low diversity and evenness in the island. Given that the biodiversity in the island is threatened, though the results are preliminary and full floral surveys were not carried out, data gathered can serve as a basis for conservation and management actions.
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    Community structure of holothuroids in selected seagrass beds in Taklong Island National Marine Reserve, Guimaras, Philippines
    Calaguing, Aldwyn C. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2018-06)
    Sea cucumbers are beneficial to mankind commercially as food and medicinal commodity. Overexploitation and illegal catch of these organisms even within Marine Protected Areas (MPAs) caused stock depleting and even local extinction of some populations in the country. Monitoring and regular assessment of their population is a must for their proper management and protection. This study investigated the status of holothuroid community within 4 selected seagrass meadows in Taklong Island National Marine Reserve (TINMR), Nueva Valencia, Guimaras. Holothuroid composition and estimates of density, frequency and distribution were determined through plot method. Species identification was based on gross morphology and spicule analysis. There were 40 individuals collected identified as 5 species, namely, Holothuria atra (n = 18), Holothuria pulla (n = 1), Holothuria scabra (n = 5), Bohadschia vitiensis (n = 2) and Synapta maculata (n = 13). The first 4 belonged to Order Aspidochirotida and the last belonged to Order Apodida. Their distribution and community structure in TINMR are likely influenced by the physical and chemical environment, seagrass community poaching, and cryptic behavior.
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    Oxygen requirement of Sea Cucumber (Bohadschia marmorata)
    Cahuya, Jezyl Leigh D. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2017-06)
    The oxygen consumption of juvenile sea cucumber Bohadschia marmorata was studied in the laboratory. The effects of temperature and body weight on oxygen consumption rate (OCR) were determined by measuring the dissolved oxygen levels using closed bottle respiratory method. Mean weight specific OCR of B. marmorata juveniles was low (9±4 pgO2h-1g-1). The OCR decreased with time from 16.9±9.1 to 6.09±3.86 ugO2h-1g-1 rapidly declining in the first two hours then, more gradually thereafter (R2=-0.92). Factors such as temperature and size affect OCR. Oxygen consumption rate tends to increase with increasing temperature. Bigger animals have low OCR levels than smaller ones (R2=0.32).
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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.