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Abundance and Diversity of Aquatic Insects in Two Water Bodies of Chittagong University Campus

Munira Nasiruddin
Department of Zoology, University of Chittagong, Chittagong 4331, Bangladesh.

Mohammad Ali Azadi
Department of Zoology, University of Chittagong, Chittagong 4331, Bangladesh.

Md. Selim Reza
Department of Zoology, University of Chittagong, Chittagong 4331, Bangladesh.

Abstract/ Executive Summary:

Abundance and diversity of aquatic insects was studied in two water bodies, (a pond and a lake) of Chittagong University campus during October 2009 to September 2010. A total of 4406 insects belonging to 32 genera, under 20 families and 6 orders were recorded. In both the water bodies, the representatives of the orders Hemiptera and Odonata were the most abundant groups. During the study period highest abundance of the total insects was recorded in November 2009 and the lowest in July 2010. Abundance of insects was comparatively higher in the pond habitat than in the lake. The Quotient of Similarity (QS) of the insects between the two water bodies was found to be the highest in October 2009 and lowest in July 2010. Species diversity, species richness and species evenness values of the lake were higher than that of the pond. Hydrophilus sp . and Sphaerodema sp. were the most dominant insects in the pond, while Chironomous sp. and Gerris sp. in the lake.

Keywords: Aquatic insects, Abundance, Diversity, Pond, Lake

Location: Chittagong University campus

Start Date: 00-10-2009

End Date: 00-09-2010

Program Area: Pest Management

Commodity: Insects

Objectives:

1. To survey and identify the aquatic insect fauna of the two water bodies

2. To find the abundance and diversity of the aquatic insects.

Methodology:

Aquatic insects were collected from two water bodies (one pond and one lake) of Chittagong University campus. The geographical positions of the pond is 22 o 29′10″ N, 91 o 47′52″ E and the lake is 22 o 28′96″ N, 91 o 46′51″ E. Collections were made from three sites of each water body and all sites were selected at the edge. Each site was separated by approximately 15-25m distance from the other site. Samplings were done once in each month from October 2009 to September 2010 between 8-9 a.m. The specimens were collected by insect drag net 1mm mesh size, area- 625cm² from the surface of the marginal zone and between and within the aquatic vegetations. Ten subsequent sweeps were repeatedly made at each station and were individually taken in plastic buckets. Insects were sorted from the detritus and kept in separate labeled plastic containers containing pond water and then taken to the laboratory, whereby, the specimens were sorted and preserved in 70% alcohol in separate labeled glass vials. The insects were identified on the basis of the external morphology and available keys. The generic abundance (%) and diversity indices were calculated for each sampling month and for overall samplings for both the water bodies. The following diversity indices of community structures were calculated. To find out the abundance of individuals in each Order, which had been counted from all the samples, abundance was calculated as percentage of an Order, being calculated from the total number of individuals of a monthly sample in both the water bodies. The simplest measure of species diversity is to count the number of species.

Source of Information: Bangladesh J. Zool. 42(1): 19-33, 2014

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

This study showed that the lake water habitat was more suitable for diversified insects. As per the mean species richness the lake hold the more aquatic insect species than the pond. The mean species evenness value was also higher in the lake than the pond. However, as per the similarity indices the insects were quite similar in both the water bodies. The study on the fauna of aquatic water body could provide valuable insights into aspects of water body ecosystem functions.

Knowledge Management: Journal