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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.Nievales, Marie Frances J.SDG: search.filters.sdg.SDG 4 - Quality education

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    Rock-associated Cryptofauna in Seagrass Beds in Taklong Island National Marine Reserve, Guimaras, Philippines
    Camache, Christian M. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2015-06)
    It has been suggested that cryptofauna makes up the bulk of marine ecosystems. Little is known of the ecology of cryptofauna and the few studies conducted about them stress their importance in the ecology of marine systems. This study was conducted to assess the biodiversity of rock-associated cryptofauna in seagrass beds in the Taklong Island National Marine Reserve (TINMR) and to correlate their abundance and diversity to the rugosity of the substrate. Rock samples were collected from three seagrass beds, namely: Calaparan, Kalirohan, and Bagatnan. The cryptofauna inhabiting the rock samples were extracted using forceps and were then sorted into major taxonomic groups and identified. The density of each taxonomic group, the diversity and similarity indices of and among sites, and the rugosity and volume of the rock samples were calculated. A total of 2,255 individuals were collected belonging to 97 OTUs and eight major taxonomic groups, with a mean density of 1.13±0.51 indiv/mL. Foraminiferans and crustaceans were the most prominent organisms observed in all sites while polychaetes showed significant density variations. Cryptic fauna diversity was low in all sites. Kalirohan had the highest diversity index (H’ = 0.86 ± 0.119) while Calaparan had the lowest (H’ = 0.67 ± 0.125). All sites showed low similarity coefficients with Kalirohan and Bagatnan showing the highest value (31% similarity). No significant correlation was found between the rugosity of rock substrates and density of cryptofauna contrary to expected trend. This suggests that rugosity may not be a key determinant of cryptofaunal abundance and diversity in rock substrates in these seagrass beds.
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    Epibiota of Holothuria scabra (Jaeger, 1833) from TINMAR, Southern Guimaras and Sagay Marine Reserve, Negros Occidental
    Calizar, Jessica Joyce D. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2013-04)
    The composition and abundance of epibiota on the sea cucumber Holothuria scabra collected in TINMAR, Southern Guimaras (Panay Gulf, northern Sulu Sea) and Sagay Marine Reserve, Negros Occidental (Visayan Sea), were determined. Epibiotic organisms on 10 Holothuria scabra individuals in each site were detached from the body surface with a fine brush dipped in alcohol. Samples collected were fixed in buffered formalin, followed by counting and identification under light microscopy. Sea cucumber epibionts consisted of photosynthetic protists, mainly diatoms (Phylum/Division Bacillariophyta), and small marine invertebrates (Protozoa, Mollusca, Arthropoda, and Annelida). Some 2,237 epibionts were counted with the diatoms as the most abundant and frequently encountered group. Epibiont species on Holothuria scabra were almost the same in both sites, except for annelids which was only encountered in samples from Sagay. Mean epibiotic abundance of Holothuria scabra from TINMAR was 61 per individual which was about a third of epibiotic abundance on individuals from Sagay (163 per individual). This study provides preliminary information on epibionts present on Philippine holothurians, and will help future researches in this field.