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Undergraduate Special Problem

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

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Adviser: search.filters.advisor.Campos, Wilfredo L.AGROVOC Keyword: search.filters.agrovoc.ecology

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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.
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    Habitat-type and temporal comparison of the meiobenthic composition of Taklong Island National Marine Reserve
    Burgos, Lorelie A. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2009-03)
    Meiofauna are very important indicators of human disturbances in the natural ecosystem. It plays a major role in the primary production, rapid nutrient cycling and other benthic chemical processes. Knowledge regarding marine benthic communities is scarce and is limited only to temperate regions. Moreover, only a few have been conducted in the Philippines, while no studies have been conducted in the Taklong Island National Marine Reserve, Nueva Valencia, Guimaras, so this serves as the baseline for further studies to be conducted in the place. This study provides a characterization of the spatial and temporal distribution of meiobenthic fauna in the Taklong Island National Marine Reserve. Specifically, the study aimed to compare the composition of meiobenthic infauna in different habitat types and to examine changes in their abundance and distribution from 4, 16 and 26 weeks after the oil spill. Meiobenthic samples were collected in Taklong Island National Marine Reserve during the Rapid and Monitoring Phases of the Benthos Project of the UPV Oil Spill Response Program. Surveys were conducted in September 2 and November 23, 2006 and February 9 2007, respectively 4, 16 and 26 weeks after the spill. Nine stations within the area were chosen based on the station grid for the biological surveys. A total of 20 taxa were identified, with nematodes being numerically dominant. It also showed the highest mean abundance in all the sampling period and for the entire habitat type. The over all mean density was (80276.71494 ind. m2, SD =19988.37), with the highest peak in February 20072007 which is 26 weeks after the oil spill (143,508.4 ind/m2). And the lowest density was recorded in the month of September 2006, 4 weeks after the oil spill (47,205.43 ind. m2). For the habitat type soft bottom has the highest recorded mean density in the entire sampling period. For the temporal variation food source, organic matter and temperature dictates the changes in distribution of meiofauna but in the study it mostly because of the oil spill happened before the sampling period.