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Diversity Indices of Plankton Communities in the River Meghna of Bangladesh

Md. Robiul Awal Hossain
Bangladesh Fisheries Research Institute, Riverine Station, Chandpur, Bangladesh

Md. Mehedi Hasan Pramanik
Bangladesh Fisheries Research Institute, Riverine Station, Chandpur, Bangladesh

Md. Monjurul Hasan
Bangladesh Fisheries Research Institute, Riverine Station, Chandpur, Bangladesh

Abstract/ Executive Summary:

The present investigation was conducted month-wise during July 2014 to June 2015 to analyze the phytoplankton and zooplankton community structure in the selected sampling stations on the River Meghna using various diversity indices. A total of thirteen sampling stations viz. Shatnol, Eklaspur, Ananda Bazar, Madrasa Ghat, Horina Ghat, Ishanbala, Haim Chor, Chor Voirabi of Chandpur district; Chor Jalalpur of Sariatpur district; Hizla, Kaliganj of Barisal district; Chor Ludhua, Chor Alexandar of Laxmipur district with corresponding GPS coordinates were selected on the River Meghna for plankton collection and analysis. The Shannon Index (H) for phytoplankton was found to be the highest in Axr (0.6829) and lowest in CV (0.5387). The Shannon Index (H) for zooplankton was found to be the highest in AB (0.4506) and lowest in Axr (0.6931). The Equitability Index (EH) for phytoplankton was found to be the highest in HG (0.9917) and lowest in CV (0.7772). The Equitability Index (EH) for zooplankton was found to be the highest in AB 0.65) and lowest in Axr (1.0). The Simpson Index (D) for phytoplankton was found to be the highest in HG (0.5057) and lowest in CL (0.6102). The Simpson Index (D) for zooplankton was found to be the highest in AB (0.722) and lowest in Axr (0.4992).The Simpson Dominance Index (D) for phytoplankton was found to be the highest in HG (0.4943) and lowest in CV (0.3537). The Simpson Dominance Index (D) for zooplankton was found to be the highest in Sn (0.278) and lowest in Axr (0.4693). Margalef Richness Index for phytoplankton was found to be the highest in Sn (0.1254) and lowest in Hz (0.09347). Margalef Richness Index for zooplankton was found to be the highest in Ep (0. 0.141) and lowest in CJ (0.1669).

Keywords: Diversity indices, Phytoplankton, Zooplankton, Meghna River, Bangladesh

Location: River Meghna of Bangladesh

Start Date: 00-07-2014

End Date: 00-06-2015

Program Area: Conservation and Biodiversity

Commodity: Plankton

Objectives:

The present study aims to analyze the phytoplankton and zooplankton community structure in the selected sampling stations on the River Meghna using various diversity indices like Shannon Diversity Index, Equitability Index, Simpson Diversity Index, Simpson Dominance Index and Margalef Richness Index. The uses of these indices are well established in the ecological literature.

Methodology:

2.1. Site selection and duration The present investigation was conducted month-wise during July 2014 to June 2015. A total of thirteen sampling stations were selected from Shatnol of Chandpur district to Char Alexandar of Laxmipur district at the South-East side and from Ishanbala of Chandpur district to Kaliganj of Barishal district at the South-West side of the River Meghna for plankton collection and analysis.

2.2. Sample collection Plankton samples were collected from each sampling stations normally at the early morning by standard drop count method during the study period. Replicate plankton samples were collected by means of a bucket (50 litre) and filtered through bolting silk plankton net of 50µ. The filtrate were transferred to 100 ml plastic bottle and preserved immediately in 1:100 Lugol’s solution. Counting and identification were done by following Ward and Whipple (1959) and Prescott (1962).

2.3. Diversity indices analysis To assess the diversity indices of plankton, species were calculated by respective formula/equation as Shannon Diversity Index, Equitability Index, Simpson Diversity Index, Simpson Dominance Index and Margalef Richness Index. The indices are as follows:

Shannon Diversity Index H = ∑ - (Pi * ln Pi) i=1 Where H = the Shannon diversity index Pi = fraction of the entire population made up of species i S = numbers of species encountered ∑ = sum from species 1 to species S

Equitability Index (EH) EH=H/lnS Where EH=Equability index H=Shannon Index S= max is the maximum possible value of H and it is equivalent to lnS

Simpson Dominance Index (D) H = ∑ (ni/n)² i=1 Where ni= number of individuals of species i n=total number of individuals

Margalef Richness Index (d) d = (S − /)1 ln N Where S is the number of species, N is the total number of individuals in the sample. These indices were used to obtain the estimation of both Phytoplankton and zooplankton species diversity index.

Source of Information: International Journal of Fisheries and Aquatic Studies 2017; 5(3): 330-334

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Diversity indices provide important information about the rarity and commonness of species in a community. The ability to quantify diversity in this way is an important tool for biologists trying to understand community structure. The present study showed phytoplankton and zooplankton community structure and their diversity in the selected sampling stations of the River Meghna.

Knowledge Management: Journal