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Substrate Based Zooperiphyton Communities and Some Physicocehmical Features of Dhanmondi Lake, Dhaka, Bangladesh

Md. Eilious Hosain
Department of Zoology, Faculty of Biological Sciences, University of Dhaka, Dhaka 1000, Bangladesh

M. Niamul Naser
Department of Zoology, Faculty of Biological Sciences, University of Dhaka, Dhaka 1000, Bangladesh

A. K. M. Nazrul Kabir
Department of Zoology, Faculty of Biological Sciences, University of Dhaka, Dhaka 1000, Bangladesh

Abstract/ Executive Summary:

This study deals with the zooperiphyton communities of Dhanmondi lake, Dhaka, Bangladesh using bamboo, mehegoni and rain tree sticks as substrates along with some physicochemical features of the lake water. It was revealed that zooperiphyton communities constitute protozoa, rotifera, copepoda, cladocera, ostracoda, conchostraca, insect larvae, oligochaeta, nematoda and mollusca. Rotifera (41%), protozoa (31%) and ostracoda (14%) were the dominant groups of zooperiphyton. Among protozoans, Epistylis sp. (52%) and Arcella sp. (20%); among rotifera, Rotaria neptunia (32.88%), Anuraeopsis fissa (17%) and Brachionus angularis (12%); among copepoda, naupleus (52%) and Cyclops sp. (32%); among cladoceran, Chydorus sp. (28%); among ostracods, Cypris sp. (100%); among molluscs, Bellamya sp. (75%) and Brotia sp. (22%) were found to be the most dominant species. The average number of zooperiphyton was 43023.55 ± 5891.34 individual m^-2 recorded from all substrates. During the study period, the physicochemical features of water of Dhanmondi lake were found to be suitable for aquatic biota. It can help in enhancing the productivity as well as sustain the aesthetic value of the lake.

Keywords: Dhanmondi Lake, Physicochemical features, Zooperiphyton Communities, Substrates

Location: Dhanmondi lake, Dhaka, Bangladesh

Start Date: 00-12-2010

End Date: 00-08-2011

Program Area: Resource Development and Management

Non-commodity: Performance

Objectives:

1. An investigation on the zooperiphytic fauna of the lake was necessary and done by using different substrates.

Methodology:

The present study was conducted at Dhanmondi Lake between December 2010 and August 2011. Details of the morphometric features and geographical locations of the lake has been furnished in Islam and Chowdhury (1979). Sampling was done between 10 am and 11 am on the sampling day in an each month. Lake water was taken by using plastic bucket from 10-20 cm below the surface. Physicochemical properties of water determined at the spot which include free CO2, alkalinity, hardness, ammonia-nitrogen, nitrite-nitrogen (HACH water quality testing kit, model FF-2, USA); temperature, conductivity and TDS (HACH conductivity meter, model HACH Sension 5, USA); Dissolved Oxygen (Lutron DO meter, model DO 5509, Singapore) and pH (HANNA pH meter, model HI 8424, Italy). Three one meter long locally available substrates such as Bamboo pole (840 cm²), Mehogoni (910 cm²) and Rain tree (980 cm²) branches were installed vertically at one meter depth in replicates, separated in equal distance. The samples for zooperiphyton study, substrates were removed and scraped, braced, and washed by supply water. After washing zooperiphyton samples, water were taken into plastic buckets and then sieved through a series of standard sieves of several mesh size (2.0mm, 0.92mm and 0.2 mm) for collection of molluscan shell. And then remained sample was filtered through 55 μm meshed plankton net and finally concentrated to 25-100 ml. The filtrates were immediately preserved by 4% buffered formaldehyde solution and then labeled, transferred to laboratory for further analysis. The estimation and identification of zooperiphyton taxa were done. Microscopic identification and enumeration were done by a compound microscope (NOVA 950 ES, China) and a Sedgewick- Rafter cell (SPS SR-Cell, UK). The abundance was expressed as the number per meter square area. Statistical analysis was done using Microsoft Office Excel 2007 and SPSS, a computer based program for Windows (Version 11.5, 2007. Systat, Inc. USA).

Source of Information: Bangladesh J. Zool. 41(1): 61-71, 2013

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The average number of zooperiphyton was 43023.55 ± 5891.34 individual m^-2 recorded from all substrates. During the study period, the physicochemical features of water of Dhanmondi lake were found to be suitable for aquatic biota. It can help in enhancing the productivity as well as sustain the aesthetic value of the lake.

Knowledge Management: Journal