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Abundance and Seasonal Diversity of Zooplankton in Coastal Aquatic Environments of Mathbaria, Bangladesh

PRONOB KUMAR MOZUMDER
Advanced Fisheries Research Laboratory, Department of Zoology,Faculty of Biological Sciences, University of Dhaka, Dhaka 1000, Bangladesh; Part of the Ph. D. dissertation of First author (PKM).

M. NIAMUL NASER
Advanced Fisheries Research Laboratory, Department of Zoology,Faculty of Biological Sciences, University of Dhaka, Dhaka 1000, Bangladesh

MUNIRUL ALAM
Enteric and Food Microbiology Laboratory, ICDDR,B. Dhaka.

ANWAR HUQ
Maryland Pathogen Research Institute, University of Maryland, USA.

Abstract/ Executive Summary:

Monthly seasonal diversity and abundance of zooplankton species at three ponds of Mathbaria were investigated from surface water column during January 2008 to December 2008. Thirty?six species of zooplankton were identified from the ponds. Among these, 25 belonged to rotifer, six were of protozoan, three were copepods and one each from cladocera and ostracoda. Nauplii (copepods) were the most abundant (39.09% in site 1, 36.81% in site 2, and 33.06% in site 3) group, while the ostracoda were the least abundant (0.1% in site 2) group. The relative abundance was maximum (39.09%) for nauplii and minimum (4.56%) for cladocera in site 1; maximum (36.81%) for nauplii and minimum (0.1%) for ostracoda in site 2; maximum (33.15%) for rotifer and minimum (1.17%) for Cladocera in site 3. The species of frequent occurrence (100%) were Cyclops sp. and copepoda nauplius. In Bangladesh, cholera outbreaks have two major peaks, one between March to May and other between August to October. This study shows that, seasonal diversity and abundance of zooplankton species varied with seasons, the zooplankton peaks coincide to the reported peak outbreak of cholera at the area.

Keywords: Seasonal diversity, Mathbaria, Zooplankton, Abundance

Location: Mathbaria of Pirozpur district

Start Date: 00-01-2008

End Date: 00-12-2008

Program Area: Conservation and Biodiversity

Commodity: Plankton

Objectives:

1. To examine the abundance, seasonal diversity and composition of zooplankton of selected ponds of Mathbaria, Bangladesh.

Methodology:

Mathbaria of Pirozpur district is located adjacent to the Bay of Bengal, approximately 400 Km southwest of Dhaka. The river, Baleshwar, flows along the western boundary of Mathbaria, on its other side a tropical mangrove forest of the Sundarbans is located. In the current study, water samples were collected monthly from three excavated ponds that are exclusively used only water sources for drinking and other restricted domestic uses. No anthropogenic contamination was allowed in the ponds except flood water. Water samples were collected from three ponds used socially in three different localities of Mathbaria, between January, 2008 to December, 2008. For zooplankton sample collection, 100 liters of water was filtered successively through 64 μm mesh nylon nets (Millipore Corp., Bedford, MA), and 50 ml of the concentrates was collected initially as a crude measure of zooplankton. The collected zooplankton samples were fixed in 4% buffer formaldehyde solution and were identified at the Advanced Fisheries Research Laboratory of Department of Zoology, University of Dhaka. For qualitative and quantitative study, zooplankton samples were examined under a compound microscope (Axioskop 40, Japan) in a Sedgeweak?Rafter cell. The specimens were identified up to genera or species level. The zooplankton species were identified using various text books.

Source of Information: Dhaka Univ. J. Biol. Sci. 20(2): 163‐171, 2011 (July)

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Results of the present investigation demonstrated that the seasonal zooplankton diversity decreased in November and December for all three sites. In contrast, the zooplankton diversity reached the peak in April for all sites and August, September and October for all sites. This could influence the abundance of Vibrio cholerae in the aquatic system.

Knowledge Management: Journal