Date of Publication

1-1996

Document Type

Master's Thesis

Degree Name

Master of Science in Biology

Subject Categories

Biology

College

College of Science

Department/Unit

Biology

Thesis Adviser

Jose Santos Carandang, VI

Defense Panel Chair

Abelardo Geronimo

Defense Panel Member

Anthony Lee
Remedios Ongtangco

Abstract/Summary

The edible freshwater bivalves in Cagayan River were: Batissa childreni, Corbicula manilensis and Psammotaea virescens. Corbicula manilensis was the most abundant species collected. High density and bigger-sized bivalves were collected in the months of May, which was the peak season. A high density of Batissa childreni was noted as the temperature of water was low. Total hardness and organic content significantly influenced the density of Corbicula manilensis and Psammotaea virescens. Lesser density of Corbicula manilensis resulted as the total hardness decreased while high density of Psammotaea virescens was noted as the organic content of the substrate increased. Relative abundance was greatly affected by the total water hardness. A positive correlation existed between relative abundance of Batissa childreni and total hardness while negative correllation existed between relative abundance of Corbicula manilensis and total hardness. Shell size of Corbicula manilensis was bigger as the total hardness increased and bigger sized Psammotaea virescens was noted as the organic content of the substrate increased. No predictor variables were significantly correlated with relative abundance of Psammotaea and the shell size of Batissa childreni.

Abstract Format

html

Language

English

Format

Print

Accession Number

TG02478

Shelf Location

Archives, The Learning Commons, 12F Henry Sy Sr. Hall

Physical Description

93 leaves

Keywords

Shells--Philippines--Cagayan River; Mollusks; Bivalvia; Freshwater ecology; Water--Composition; Water quality

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