Preliminary checklist of desmids from Kokrajhar District, Assam, India | JBES

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Preliminary checklist of desmids from Kokrajhar District, Assam, India | JBES

The present investigation shows that the desmids flora of Kokrajhar District of Assam is rich and diverse. Among the observed genera, Cosmarium has the maximum.

Abstract

This paper presents a precursor in the investigation of the desmids of Kokrajhar District, Assam, India. The present study deals with the diversity of desmids from different freshwater habitats of the district. For this study samples were collected randomly from 12 different habitats around the district from January 2018 to April 2019. Seventy-one species were observed comprising eleven genera: Actinotaenium (1), Arthrodesmus (3), Bambusina (1), Closterium (12), Cosmarium (16), Desmidium (4), Euastrum (6), Gonatozygon (1), Hyalotheca (1), Micrasterias (6), Nerium (1), Onychonema (1), Pentium (1), Pleuroteanium (5), Spirotaenia (1), Staurastrum (6), Triplocerus (1) and Xanthidium (4). Among the observed taxa, some appeared to be the new records for the state of Assam, India.

(A) Bambusina brebissonii Kuetz. (B) Closterium acerosum (Schrank) Ehrenberg var. tumidumBorge (C) Closterium biclavatumBoerg. var. biclavatumf. Biclavatum (D) Closterium closterioidesRalfs var. intermedium (Roy et Bisset) Ruzicka (E) Closterium Cynthia Notaris var. cynthia (F) Closterium gracileBreb. var tenue (Lemm.) West, W. & G.S. (G) Closterium kuetzingiiBreb. var kuentzingii (H) Closterium kuetzingiiBreb. var. vittatumNordst. (I) Closterium praelongumBerb. var. praelongum (J) Closterium rectimarginatum Scott & Prescott (K) Closterium striolatum Ehrenberg ex Ralfs var. erectumKlebs (L) Closterium subjuncidiforme Gronblad (M) Closterium turgidum Ehrenb. var. borgei (Borge) Defl. (N) Desmidium aptogonum Breb. var. aptogonum (O) Desmidium baileyi (Ralfs) Nordst. var. baileyi.

Introduction

Desmids are unicellular micro-organisms belonging to the division Chlorophyta and order Zygnematales (Kadiri, 2002). These are considered as the closest living relatives of land plants (Timme et al., 2012, Turmel et al., 2013). This beautiful group of algae has diverse symmetry and attractive forms, that have long been attracted the interest of scientist since early time and a great number of observations were made from different part of the world. Thousands of species have been described from a variety of freshwater habitats around the world (Prescott et al., 1972, 1975, 1977, 1981, 1983; Croasdale et al., 1983). Desmids have been reported from various parts of Asian continent. West and West (1902) reported 279 desmids from Ceylon and 148 desmid taxa from Burma (Myanmar), West Bengal, Bangladesh and Madras presidency (Tamil Nadu) (West and West, 1907). Besides these Kreiger (1932), Hirano (1992), Scott and Prescott (1961) and Kanestsuna (2002), Kanetsuna & Yamagishi, 2018 contributed on the distribution of tropical desmids in the Asian region.

(A). Actinotaenium capax (Joshua) Teiling var. capex (B) Arthrodesmus convergens Ehrenberg ex Ralfs var. incrassatus (C) Arthrodesmus curvatus Turner var. curvatus (D) Arthrodesmus curvatus Turner var. kalimantanus (E) Cosmarium angulatum (Perty) Rabenh. var. angulatum f. major (F) Cosmarium connatum Breb. (G) Cosmarium contractum Kirch. var. minutum (H) Cosmarium cycladatumTurner (I) Cosmarium decoratum West, W. & G.S. (J) Cosmarium favum West. var. indicum (K) Cosmarium geminatum Lund. var. geminatum f. ornatum (L) Cosmarium margaritatum (Lund.) Roy & Bisset var. quadrum (M) Cosmarium obsoletum (Hantz.) Reinsch var. sitense (N) Cosmarium pseudobroomei Wolle (O) Cosmarium quadrum Lund. var. quadrum (P) Cosmarium scabrolatum Turner (Q) Cosmarium striolatum Naeg. var. striolatum f. intermedium (R) Cosmarium tagmasterion Scott & Prescott (S) Cosmarium undulatum Corda ex Ralfs var. alaskanum f. reductum (T) Cosmarium pakistanicum Islum.

Altogether 27 genera with 272 species having been reported from India (Iyengar and Vimala Bai 1941; Patel and Kumar, 1979; Prasad and Misra, 1992; Bordoloi, 1983; Hegde, 1986; Bongale, 1986; 1987; Issacs and Hegde, 1987; Habib & Pandey (1989); Kumar and Patel, 1988; 1990a; b; Pal and Santra, 1993; Mishra and Srivastava, 2003; Perumal and Anand, 2008; Stanley and Baluswami, 2009). Although Kokrajhar District in Assam is blessed with a variety of freshwater habitats, the freshwater algae from the district have been overlooked from the documentation. But there is a lack of knowledge on this group of algae from the district of Kokrajhar, Assam. The most recent study on freshwater desmids of the state of Assam was done by Deka et al. (2011) Yasmin et al. (2011, 2015), Das & Adhikary (2012), Phukan and Bora (2012) who sampled freshwater habitats in different parts of the state of Assam. In all these studies 25 different genera of desmids of the total 160 algal genera were reported. Besides these sporadic reports, neighboring regions contain a rich documented desmid flora. For example, in a study of desmids from Eastern Himalayas, Das D & Keshri JP (2012, 2013, 2016) reported 272 taxa under 27 genera. Thus, this study aims to documents the diversity of Desmids in the Kokrajhar District of Assam, India. As this group, of organisms, is considered as the quality indicator of the freshwater habitat (Ngeampat and Peerapornpisal, 2007) thus, in order to study the freshwater algae from a distribution, diversity, and taxonomic point of view the desmids is chosen for the present study. Get full articles by following the link J. Bio. Env. Sci. 17(4), 11-20, October 2020.

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