Esguerra, Marc Wilmer D. and Gutierrez, Ian Lordeo A. (2014) Abundance of zooplankton and its correlation with the physico-chemical characteristics of Imus River. Undergraduate thesis, De La Salle University-Dasmarinas.

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Abstract

Imus River, which transverses in the municipality of Imus, is one of the most important water systems in Cavite because of its ecological and economic uses. In an effort to assess the river’s ecological status, zooplankton collection and measurement of selected physico-chemical characteristics were performed. Twenty two species of zooplankton were recovered which belong to 4 phyla, 3 classes, 7 Orders, and 11 families. Cyclops bicuspidatus thomasii, Brachionus plicatilis and Limnoncaea genuina were found to be the most abundant species during the dry and wet season. Cyclops bicuspidatus thomasii which is a member of Class Crustacea and Order Copepoda has an importance value of 27.67 and 26.27 during the dry and wet season, respectively. It is followed by Brachionus plicatilis which belongs to Class Rotifera and has an importance value of 25.00 and 25.64 during the dry and wet season. Last is Limnoncaea genuina which belongs also to Class Crustacea and Order Copepoda has an importance value of 20.87 and 21.37 during the dry and wet season. The three least abundant species are Evadne spinifera, Paracalanus parvus, and Favella ehrenbergii. Evadne spinifera is the least abundant species with an IV of 7.57 during the dry season and 6.16 during the wet season. Paracalanus parvus is the second least abundant with an IV of 7.52 during the dry season and 7.15 during the wet season. The third least abundant is the Favella ehrenbergii with an IV of 8.03 during the dry season and 7.70 during the wet season. The abundance of these said species are influenced by the physical and chemical conditions of the river, their life cycle and morphological characteristics. The environment of the water is a great factor for the survival of the species. Based on the DENR Standards of 2008 and the result of the measurement of the physico-chemical characteristics, Imus River is classified under Class C waters. The river is used in fishery, recreation and agricultural purposes. A correlation between the abundance of zooplankton and the physico-chemical characteristics showed varying degrees of correlation. In the dry season, DO, pH and salinity showed a positive correlation while temperature, light attenuation, nitrates and phosphates showed a negative correlation. In the wet season, salinity, nitrate, phosphate and hardness showed a positive correlation while temperature, light attenuation, DO and pH showed negative correlation.

Item Type:	Thesis (Undergraduate)
Additional Information:	BIO 1042 2009
Subjects:	Q Science > QH Natural history > QH301 Biology
Users:	College of Science and Computer Studies > Biological Science
Depositing User:	Users 4 not found.
Date Deposited:	06 Dec 2015 23:51
Last Modified:	02 Apr 2022 08:45
URI:	https://thesis.dlsud.edu.ph/id/eprint/265

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