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02. DSSC Electronic Theses and Dissertations

Permanent URI for this communityhttps://hdl.handle.net/20.500.14578/3

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    Species composition, diversity, abundance, and microhabitat preferences of anuran species in the Miral river, Bansalan, Davao del Sur
    Ubat, Drahcir E. (Davao del Sur State College, 2025-05)
    A comprehensive anuran survey was conducted across three sites along the Miral River in Bansalan, Davao del Sur—Barangay Managa (upstream), Barangay Tubod (midstream), and Barangay Poblacion Uno (downstream). Using 270 man-hours of cruising and mark-release-technique, the survey documented anuran species, assessed habitat associations, and generated baseline data on Mindanao's amphibian diversity. A total of 104 anuran individuals were recorded, representing six species and four families, with 67% being non-endemics and 33% endemic to the Mindanao faunal region. Limnonectes magnus was noted as nearly threatened. Species diversity was highest upstream (H' = 1.52, S = 6), moderate midstream (H' = 1.05, S = 4), and lowest downstream (H = 0.43, S = 2), but were not statistically significant (p = 0.2193). While species composition varied between sites (p = 0.1875). Most anurans utilized both aquatic and terrestrial microhabitats, indicating microhabitat overlap. This study revealed that Rhinella marina was strongly linked to warmer water, higher pH, and elevated air temperature—conditions typical of downstream habitats. Conversely, upstream habitats, with dense canopy, abundant moss, leaf litter, and minimal disturbance, supported species like Polypedates leucomystax and Kaloula pulchra. Obviously, principal component analysis revealed that elevation was the most influential environmental factor with strong association habitat variables affecting anuran preferences. Endemic species were associated with intact forest areas, though signs of forest clearing for agriculture indicated environmental stress. The dominance of invasive species and the low presence of the near-threatened Limnonectes magnus underscore the urgent need for conservation efforts to protect native amphibians and restore natural habitats in the Miral River ecosystem.
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    Cost-efficacy of seaweed-based liquid biostimulant as pre-treatment prior to outplanting of Kappaphycus alvarezii
    Marquez, Kathleen Jane Z. (Davao del Sur State College, 2024-05)
    This experimental study determined the cost-efficacy of using seaweed-based liquid biostimulant (SLB) as a pre-treatment prior to outplanting Kappaphycus alvarazii and it was conducted at Sitio Biao, Barangay Cogon, Digos City, Province of Davao del Sur, Philippines. Five different levels of treatments were used; control farmers practices (T1), 9g of Urea Inorganic Fertilizer (T2), 10 ml seaweed-based liquid biostimulant (T3), 20 ml seaweed-based liquid biostimulant (T4), and 30 ml seaweed-based liquid biostimulant (T5). Four replications were done in each treatment and all were places randomly in farming site. The yield and specific growth rate (SGR) were recorded and the cost-efficacy of each treatment was analyzed. After 30 days of cultivation, a significant increase in the yield and growth rate were observed in all the treatments. Result also shows that as SLB increases its dosage, the yield and SGR of the Kappaphycus alvarezii after 30 days also increases. The cost-benefit ratios (CBR) of the five treatments in this study was also calculated. T3, T4 and T5 stood out as both portrayed a positive return on investment, at 1.01, 1.27 and 1.42 respectively.
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    Processing of cacao by-products and corn bran as feed pellet for rabbit
    Calamba, Elsie O. (Davao del Sur State College, 2024-06)
    The study was conducted to determine the cacao by-products and corn bran as feed pellet for rabbit. It was conducted to determine the nutrient content kilogram of cacao placenta meal, cacao pod husk, cacao bean shell and corn bran, durability, bulk density and cost to produce a kilogram of feeds. Completely Randomized Design were used in the study with three treatment and three replications. Moreover, the study utilized carboxymethyl cellulose as binder for feed pellet. The study's results and findings indicate that the crude protein levels fell within an acceptable range across treatments. However, the crude fiber content was notably higher compared to that typically seen in rabbit feed, as well as the ash content. Additionally, the durability showed significant difference between Treatment 1 and Treatment 2, with Treatment 3 displaying a highly significant difference among treatments. Bulk density also showed significant differences among treatment. Moreover, the cost to produce a kilogram of feed was found to be minimal than the market price of rabbit pellets.