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Species Diversity and Seasonal Composition of Aquatic Weeds in Tanguar Haor Area at Taherpur Upazilla Under Sunamganj District, Bangladesh

AKM Munzurul Hasan
Department of Fish Biology and Genetics, Faculty of Fisheries, Sylhet Agricultural University, Sylhet, Bangladesh

Rabeul Awoal
Department of Aquaculture, Faculty of Fisheries, Sylhet Agricultural University, Sylhet, Bangladesh

Tofael Ahmed Sumon
Department of Aquaculture, Faculty of Fisheries, Sylhet Agricultural University, Sylhet, Bangladesh

Md Alal Hossen
Department of Fish Biology and Genetics, Faculty of Fisheries, Sylhet Agricultural University, Sylhet, Bangladesh

Tasrik Araf
Department of Fish Biology and Genetics, Faculty of Fisheries, Sylhet Agricultural University, Sylhet, Bangladesh

Mohammed Anas Chowdhury
Department of Fisheries Management, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh

Md Saif Uddin
Department of Aquaculture, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh

Abstract/ Executive Summary:

The study was conducted to collect, identify and assess the weed biodiversity of Tanguar haor in a different season. It was done for 9 months from December’ 2015 to August’ 2016 in three seasons named as pre monsoon, monsoon and winter. A total of 26 species of aquatic weeds under 20 families were identified from the hoar areas. Among 3 common groups of aquatic weeds, 11 species of emergent, 12 species of floating 3 species of submerged were collected. Various aquatic weeds were found in different seasons i.e. Ecchornia crassipes, Pistia straties, Nymphoides indicum were found in the summer season, Nymphaea pubescens, Ipomoea aquatic, Enhydra fluctuans, Ludwigia adscendens, Azolla pinnata were found in winter and Ipomea fistulosa, Hidrilla verticulata, Najas minor were found in the year round. The season-based composition of weeds also observed where the highest number of composition was found in summer following by monsoon and winter. As the temperature is a factor for the growth of plants the temperature record was also studied, it was found highest in September and lowest in January. Therefore, as there was no previous study on particularly aquatic weeds this study will reveal some important information for future study. Various recommendations and measures have been suggested to improve the biodiversity of aquatic weeds in Tanguar hoar area at Taherpur Upazilla under Sunamgonj district

Keywords: Tanguar haor, Aquatic weed, Species abundance

Location: Tanguar haor area at Taherpur upazilla under Sunamganj district, Bangladesh

Start Date: 00-12-2015

End Date: 00-08-2016

Program Area: Conservation and Biodiversity

Commodity: Fisheries diversity, Aquatic weeds

Objectives:

Variation in aquatic weeds is different from one season to another season. They play impacts on biodiversity physically and chemically. There is a scarcity of information on aquatic weeds in haor region. There is an urgent need to study on aquatic weeds. Therefore the study was undertaken to identify commonly found aquatic weeds in Tanguar Haor.

Methodology:

Description of Study Area and Period of Study: The primary criterion for the selection of the study area was a suitable geographical coverage of haor as far as possible. At first, primary information was collected from Tahirpur Upazila Fisheries Officer regarding the concentration of aquatic weeds of the particular study area. The survey was conducted for 9 months from December’ 2015 to August’ 2016. The study season can be named as Winter (December’15 to February’16), Pre monsoon (March’16 to May’16) and Monsoon (June’16 to August’16). Data were collected from fourteen villages of the seven unions under Tahirpur upazilla of Sunamganj District.

Data Collection Every sampling day samples of aquatic weed were collected from Tanguar Haor. Different sites of the study area are considered for sampling. Monthly sampling was done and data were recorded. Weeds were manually collected from the sampling spots and then brought to the laboratory immediately and preserved in 7-10% formalin for further classification and identification. Data processing, analysis and identification Data processed and analyzed has done by using simple Microsoft Excel 2007. Samples of weeds were placed on a table for the easy contrast of vision for the identification.

Source of Information: International Journal of Fisheries and Aquatic Studies 2018; 6(4): 570-574

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The present study has found a wide range of diversity in aquatic weeds of Tanguar haor. Most of these weeds have a positive role in the ecosystem of Tanguar haor, it has just enriched the ecosystem to great extent. It has also a significant role in the socio-economic condition of the adjacent human community. The availability of weeds has changed with the change of season due to seasonal succession. So, further research can be done to get more diversified and available species of weeds in Tanguar haor.

Knowledge Management: Journal