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New Record of Planktonic Diatoms from the Sundarban Mangrove Forests, Bangladesh

ABDUL AZIZ
Department of Botany, University of Dhaka, Dhaka

MASHRURA RAHMAN
Department of Botany, University of Dhaka, Dhaka

Abstract/ Executive Summary:

Botanical expedition to the Sundarban Mangrove Forests in the Bangladesh part revealed the presence of 14 diatom taxa not recorded so far from Bangladesh territory. The taxa are Amphiprora alata Kütz., Chaetoceros pendulus Karsten, Chaetoceros socialis Lauder, Cyclotella comta (Ehr.) Kütz. Thalassionema nitzschioides (Grun.) Meresch, Thalassiosira rotula Meunier, Thalassiosira weisflogii Grun., Lioloma delicatula (Cupp) Hasle, Navicula brekkaensis Petersen fa, Nitzschia inconspicua Grun. fa, Nitzschia romana Grun., Surirella fastuosa var. recedens (Schm.) Cl. Besides these, unidentified species of Chaetoceros sp. and an unidentified centric diatom have been recorded. These newly recorded taxa are described and illustrated.

Keywords: Phytoplankton, Diatoms, Mangrove, Estuarine algae, Centrales, Pennales

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Program Area: Knowledge Management

Commodity:

Objectives:

The present study was thus undertaken to record the diversity of phytoplankton within the SMF of Bangladesh

Methodology:

A total of 65 phytoplankton samples from 8 locations were collected between 25 and 29 March, 2010 from four Ranges covering about 70% of the Sundarban Mangrove Forests (Table 1). From each site, five samples were collected during high and or low tides by passing 22 litre water for each sample, through 40 μm mesh plankton net. The final volume of the sample was 20 ml and preserved in Lugol's solution.Identification of phytoplankton taxa were made following Ahmed et al. (2009), Cupp (1943), Germain (1981) and Subrahmanyan (1946).

Source of Information: Bangladesh J. Bot. 40(2): 163-169, 2011 (December)

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

A total of 14 phytoplankton taxa namely, Amphiprora alata Kütz., Chaetoceros pendulus Karsten, Chaetoceros socialis Lauder, Chaetoceros sp., Cyclotella comta (Ehr.) Kütz. Thalassionema nitzschioides (Grun.) Meresch, Thalassiosira rotula Meunier, Thalassiosira weisflogii Grun., Lioloma delicatula (Cupp) Hasle, Navicula brekkaensis Petersen fa., Nitzschia inconspicua Grun. fa, Nitzschia romana Grun., Surirella fastuosa var. recedens (Schm.) Cl. and an unidentified centric diatom, were found for the first time in the SMF of Bangladesh territory. These taxa were not recorded from SMF of Indian part. An illustrated account and taxonomy of these newly recorded taxa have been provided and discussed in this paper.

Knowledge Management: Journal