Plankton distribution and composition of oxbow lakes in Sabah

Azima Azmi, (2007) Plankton distribution and composition of oxbow lakes in Sabah. Masters thesis, Universiti Malaysia Sabah.

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Abstract

The study aims to document and inventory the plankton composition and distribution of oxbow lakes in Sabah viz. Sugut, Klias Peninsula and Kinabatangan areas. Sugut was chosen as the main study area where four oxbow lakes were sampled in both the dry and wet seasons. These oxbow lakes were chosen based on different land use. In addition, three oxbow lakes were sampled respectively in the Klias Peninsula and Kinabatangan in the dry season for comparison of different locations. Phytoplankton was sampled using 20IJm mesh size plankton net and enumerated using an Uthermohl counting chamber. The algal biomass (measured as mg/L chlorophyll-a concentration) was determined using the Trichrometric Methods. Zooplankton was sampled using 63IJm mesh size plankton net and enumerated using Sedgwick-rafter (S-R) cells. The primary production was measured using the light and dark bottle technique. Fishes in the oxbow lakes were caught randomly for data inventory. A total of 159 phytoplankton species, a numbers of 10 species of zooplankton and 8 freshwater fishes were inventoried during the studies. These oxbow lakes were characterized by relatively high densities of phytoplankton (10.1-47.5 x 103 cells/L), compared to their parent river (10-22.3 x 103 cells/L). High algal biomass were also recorded ranging from 1.70 to 5.70 mg//L in these oxbow lakes. The primary productivity measurement ranged from 0.38-0.81 mg/L/hour. Based on phytoplankton species, there were differences between the oxbow lakes' and its parent river. The statistical analyses of correlation and Kruskal-wallis test shows there is a relationship between the composition and diversity of oxbow lakes' phytoplankton between dry and wet season and its surrounding effect.

Item Type:Thesis (Masters)
Uncontrolled Keywords:plankton composition, oxbow lake, phytoplankton, dry and wet season, diversity
Subjects:T Technology > TD Environmental technology. Sanitary engineering
Divisions:SCHOOL > School of Science and Technology
ID Code:7325
Deposited By:IR Admin
Deposited On:21 Oct 2013 11:36
Last Modified:21 Oct 2013 11:36

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