Diversity of freshwater crabs in relation to the physico-chemical properties of water in selected sites of Labac River /
by Joshua Ain Emmanuel R. Diel.
- Indang, Cavite : Cavite State University- Main Campus, 2019.
- xiii, 75 pages : illustrations ; 28 cm.
Thesis (Bachelor of Science in Biology) Cavite State University.
Includes bibliographical references.
College of Arts and Sciences (CAS), Department of Social Sciences College of Arts and Sciences (CAS), Department of Social Sciences
DIEL, JOSHUA AIN EMMANUEL R. Diversity of Freshwater Crabs in Relation to the Physico-chemical properties of water in Selected Sites of Labac River. Undergraduate Thesis. Bachelor of Science in Biology, major in General Biology. Department of Biological Sciences. College of Arts and Sciences. Cavite State University, Indang, Cavite. May 2019. Adviser. Prof. Dickson N. Dimero. This study was conducted to describe the different sites of Labac river in terms of width and depth, determine the physic-chemical properties of water (temperature, velocity, pH, Dissolved Oxygen (DO), Total Suspended Solids (TSS), Total Dissolved Solids (TDS) and Biochemical Oxygen Deman (BOD)) in selected sites of the Labac river, determine the presence of heavy metals lead and zinc, assess the population count of freshwater crabs in selected sites of Labac river, and analyze the relationship of freshwater crabs to the physic-chemical properties of water in Labac river. The four selected sites of Labac river was very wide (25.10 m), deep (1.72 m), warm (27.74 °C), was very slow water flow (12.83 cm/s), the water was acidic (6.92), has sufficient DO level (6.71 mg/1), poor TDS (15,254.86 mg/1), high TSS (637.26 mg/1), and fair BOD (3 mg/L). Five species of crabs were identified from the four selected sites of the river. Varuna literata commonly known as katang was collected from Banaba Cerca. The freshwater crab species collated from Kay-Alamang was Episesarma versicolor (Violet vinegar crab). Three spot swimming crab or Portunus sanguinolentus was collected from the Timalan river. Two species were collected from Balsahan river namely: Ocypode madagascariensis (Ghost crab) and Portunus pelagicus (Flower crab). The four selected sites were recorded to be not diverse in terms of Shannon and Simpson's Index thus there were no species Evenness. Kay-Alamang river was recorded to be abundant, with highest frequency as well as density. The correlation of freshwater crabs in physicochemical parameters showed strong correlation between width, depth, velocity, pH and BOD. Moderate correlations on temperature and TDS while moderate negative correlation was seen on DO. TSS showed weak correlation with the counts of freshwater crabs.