00000ctmaa22000003a 4500 UP-1685675941123958187 Buklod 20180816141814.0 aa rb |||1 u| ta 180816s xx d r |||| u| (iLib)UPTAC-00019010306 UPVTC eng LG 993.5 2018 B5 G37 Garcia, Katrina A. author. A preliminary survey of freshwater snails from selected barangays in the elevated region of Palo, Leyte. Katrina A. Garcia 2018 ix, 85 leaves illustrations. Undergraduate thesis (B.S. Biology) -- University of the Philippines, Tacloban. The municipality of Palo has no updated inventory regarding the biodistribution of freshwater gastropod species found in the locality. Thus, this study is aimed to survey the freshwater snails present in the municipality, particularly in the elevated terrains. Freshwater snails were collected in selected barangays through intensive sampling and ring sampling in March to April 2018. A total of 4883 individual freshwater snails were collected in the selected barangays of Palo, Leyte. 10 species belonging to 7 families were identified. Four of these families--Ampullaridae, Viviparidae, Pomatiopsidae, and Thiaridae belonged to Subclass Caenogastropoda, while the 3 other families--Physidae, Lymnaeidae, and Planorbidae belonged to Subclass Heterobranchia. Among the families identified, Thiaridae was the most species rich group. Pomacea canaliculata (Ampullaridae) was the predominant freshwater snail species garnering a total of 34.06% of the total number of individuals collected. All other snail species had significantly lower relative abundances. Snail species were found in both lotic and lentic habitats with sandy to muddy substrata. Differences in snail population density and species diversity were attributed to biotic and abiotic factors including vegetation, abundance of the predominating species, and frequent disturbance. Collecting stations established in Palo, Leyte had relatively low Simpson diversity index and Shannon-Weiner diversity index ranging from 0.0685 to 0.713 and 0.176 to 1.433 for the intensive sampling and from 0 to 0.702 and 0 to 1.275 for the random ring sampling, respectively. The high abundances of M. tuberculate and P. canaliculata influenced the low diversity values across all stations due to their widely invasive nature. Varona, Gracia F. adviser. Preliminary pages only https://drive.google.com/file/d/1uD_yXahpkRpJzY848ARfdI3-ptm7aFgc/view?usp=sharing FI UP UPTAC UPTAC LG 993.5 2018 B5 G37 Thesis