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Abundance of Benthic Fauna in Winter and Summer Seasons at Three Water Bodies of Dhaka, Bangladesh

Tonima Mustafa
Department of Zoology, Jagannath University, Dhaka-1100, Bangladesh

M. Niamul Naser
Department of Zoology, University of Dhaka, Dhaka-1000, Bangladesh.

Tahmina Hoq
Department of Zoology, University of Dhaka, Dhaka-1000, Bangladesh.

Md. Ahsanu Kabir Likhon
Department of Zoology, Jagannath University, Dhaka-1100, Bangladesh

Fatama-Tuz-Johora
Department of Zoology, Jagannath University, Dhaka-1100, Bangladesh

Md. Shah Jamal
Department of Zoology, Jagannath University, Dhaka-1100, Bangladesh

Shayer Mahmood Ibney Alam
Department of Zoology, Jagannath University, Dhaka-1100, Bangladesh

Abstract/ Executive Summary:

The study was conducted on abundance of benthic fauna during winter and summer in three water bodies of Dhaka (Ramna park lake, Baldah garden pond and Naya bazar pond) from December 2011 to May 2012. More species were found in summer than winter season. A total of 15 genera of benthos were found in Ramna park lake, 7 in Baldah garden pond and 9 in Naya bazar pond. The species diversity was more in Ramna park lake than in others as the water of Ramna park lake seems to be less polluted.

Keywords: Benthic fauna, Water bodies, Seasonal variation, Dhaka city

Location: Three water bodies of Dhaka (Ramna park lake, Baldah garden pond and Naya bazar pond)

Start Date: 00-12-2011

End Date: 00-06-2012

Program Area: Resource Development and Management

Commodity: Aquatic animal

Objectives:

1. The present study was conducted to assess habitat quality of the lake ecosystem on different months through the variation of benthic fauna in three selected water bodies.

Methodology:

Study area: The study was conducted in three water bodies of Dhaka city: Ramna park lake, Baldha garden pond and Naya bazar pond Ramna park is located at Shahbag area in Dhaka metropolitan city. The lake was originated from a channel of the Karwan bazar river and was connected to the Turag and Buriganga river. The department of environment looks after the aspects of proper environment and protection of aquatic resources of the lake. In and around Ramna park, some renovation works were carried out between 1998 and 2001 with a view of making the lake a pollution free recreation area. Baldah garden pond is situated at Wari in Dhaka metropolitan city. The park is enriched with different types of plants and flowers. There is a round shape pond in the middle of this park. Naya bazaar pond is located at Naya bazaar in Dhaka city. The pond water is relatively clean and local people use it for bathing only. It is surrounded by a fence. There are many coconut trees around the pond. The pond is also used for fish culture. A sport fishers’ competition is held once a year. The study was carried out from December to 2011 to June 2012. Methodology: Samples were collected from the three selected water bodies with the help of Eckman dredger. Collection of samples was done from the selected places during 05.0 am to 12.0 pm. Clay samples were preserved in container with 20% formalin. The clay was sieved using different mesh sized sieve. Droppers were used to separate the benthos. The collected samples were preserved in properly labelled bottle containing 5% formaldehyde. The benthos spp. were identified at least to the genus.

Source of Information: Bangladesh J. Zool. 41(1): 79-86, 2013

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The total of 15 genera of benthos that belonged to 9 families were identified from the three wetlands (Ramna park, Naya bazar and Baldah garden) of Dhaka city. The different species of benthos identified during this study were previously reported from these sites. But the present study located upon the seasonal (winter and summer) variation of species abundance. In conclusion, the dominant benthos in three water-bodies in Dhaka city belongs to oligochaetes, chironomid larvae and molluscs which can be used as indicators of organic pollution (oligochaetes, chironomid larvae) and inorganic pollution (molluscs) in aquatic ecosystems. Hence, occurrence of these organisms at higher densities in these lakes primarily suggests some levels of organic matter and inorganic pollutant input. A decline of organic and inorganic pollution in the Ramna park, Naya bazar and Baldah garden could increase in benthos richness and diversity would imply improved ecological conditions of the aquatic environment.

Knowledge Management: Journal