Northeast India: An important region with a rich biodiversity of Rotifera

Sharma, B. K.; Sharma, Sumita

doi:10.1002/iroh.201301701

Cited by 13 publications

(23 citation statements)

References 37 publications

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“…ANOVA registered significant rotifer density variations (F 2,71 = 10.595, P = 0.0001) amongst three beels. The importance of Rotifera in Bhereki and Ghotonga beels agreed with the reports of [1,3,[6][7][8][9]29,35] while its sub-dominance in Holmari beel agreed with the reports of [5,28,37,38]. The Rotifera density followed indefinite monthly variations in the sampled beels with peaks during post-monsoon (September, 2010), summer (July, 2011) and winter (January, 2012) in Bhereki, Holmari and Ghotonga beels, respectively.…”

Section: Zooplankton Richnesssupporting

confidence: 85%

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Zooplankton Diversity of Three Floodplain Lakes (Beels) of the Majuli River Island, Brahmaputra River Basin of Assam, Northeast India

Sharma¹

2017

JAMB

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The biodiverse zooplankton of Bhereki, Holmari and Ghotonga beels of Majuli River Island, the Brahmaputra river basin of upper Assam, northeast India (NEI) revealed total richness of 141 (118±8) species and thus suggested habitat diversity of these floodplain wetlands. Low community similarities, monthly richness variations and the cluster groupings affirmed heterogeneity of zooplankton species composition. Zooplankton formed the dominant component of net plankton in Ghotonga beel and showed sub-dominance in Bhereki and Holmari beels. Rotifera > Rhizopoda influenced zooplankton density in Bhereki and Ghotonga beels; Rhizopoda > Rotifera showed importance in Holmari beel; and Copepoda > Cladocera recorded sub-dominance in all beels. Zooplankton is characterized by higher species diversity and equitability, and lower dominance. The richness, abundance and diversity of zooplankton and abundance of the constituent groups followed oscillating monthly variations. While explaining limited influence of individual abiotic factors and low cumulative influence along two axes (vide Canonical Correspondence Analysis), our results suggested that zooplankton are largely generalists in terms of abiotic factors and thus hypothesized importance of factors associated with microhabitat. formalin. These samples were subsequently screened for various zooplankton species and their permanent mounts were made in polyvinyl alcohol-Lactophenol mixture.Monthly quantitative zooplankton samples were also obtained by filtering 25 litres of the lake water through nylobolt plankton net (No. 25). Individual collections were then concentrated to 25 ml each and preserved in 5% formalin. The quantitative enumeration (n/l) was done with the help of a Sedgewick-Rafter counting cell. The zooplankton was identified following the works of [1,[14][15][16][17][18][19]. Quantitative samples were analyzed for abundance of zooplankton. Community similarity (Sørensen's index) and species diversity (Shannon's index) were calculated following [20,21]. ANOVA was used to analyze the significance of temporal variation of the biotic communities. Ecological relationships between abiotic and biotic parameters of Bhereki beel, Holmari beel and Ghotonga beel were determined by simple correlation co-efficient (r 1, r 2 and r 3, respectively); P values were calculated and their significance was ascertained after the use of Bonferroni correction. The canonical correspondence analysis (XLSTAT 2014) was done to analyse cumulative influence of seventeen abiotic parameters (water temperature, rainfall, pH, specific conductivity, dissolved oxygen, free CO 2 , total alkalinity, total hardness, calcium, magnesium, chloride, dissolved organic matter, total dissolved solids, phosphate, nitrate, sulphate and silicate) on the zooplankton assemblages.

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Section: Zooplankton Richnesssupporting

confidence: 85%

“…These remarks hold valid for the Indian floodplains and those of northeast India (NEI) in particular [1][2][3]. These wetlands form a lucrative source of inland fishery [4] of NEI and are locally known as 'beels' in Assam and pats in Manipur.…”

Section: Introductionmentioning

confidence: 99%

Zooplankton Diversity of Three Floodplain Lakes (Beels) of the Majuli River Island, Brahmaputra River Basin of Assam, Northeast India

Sharma¹

2017

JAMB

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“…This species is known from India exclusively from Assam state of NEI (Sharma 2004, 2014, Sharma & Sharma 2008, 2014d, 2015b, Sharma et al 2015. Nevertheless, these two Australasian elements affirmed affinity of Rotifera assemblage of Assam state as well as of NEI with the faunas of Southeast Asia and Australia, and thus supported remarks of Sharma (2005) and Sharma and Sharma (2005, 2008, 2014a, 2014c, 2014d (Meas & Sanoamuang 2010, Sor et al 2015. L. blachei, described from Cambodia is also known from Thailand, while its Indian reports are restricted till date to Assam (NEI) and West Bengal (Sharma & Sharma 2014b).…”

Section: Discussionmentioning

confidence: 59%

“…Referring to the first category, Segers (2001) remarked on occurrence of reductus vicariant of B. dichotomus outside Australia, hinted at a possible Australian origin of this taxon and hypothesized its recent expansion to Southeast Asia. The disjunct populations of this brachionid known from India only from NEI (Meghalaya, Tripura and Assam) are hypothesized (Sharma & Sharma 2014a, 2014c, 2014d, 2015b, 2015c to their possible recent expansions to the Indian subregion. This taxon is reported from the Oriental region from Vietnam (Zhdanova 2011) and from Thailand (Athibai et al 2013, Sa-Ardrit et al 2013).…”

Section: Discussionmentioning

confidence: 94%

“…The rotifer assemblages of these ecotones are poorly documented in India in general except for the floodplain lakes (beels) of the Brahmaputra river basin of Assam state which are known for their rich and interesting rotifer diversity (Sharma & Sharma 2005, 2008, 2014a, 2014b, 2014c, 2015a in the Indian subregion. The present limnological reconnaissance is undertaken to further explore the biodiversity importance of 'managed beels' (for fisheries) of Barpeta district of lower Assam.…”

Section: Introductionmentioning

confidence: 99%

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Interesting rotifers (Rotifera: Eurotatoria) from floodplain lakes of lower Brahmaputra river basin of Assam, northeast India

Sharma¹,

Khan²

2016

Opusc Zool

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Abstract. The plankton and semi-plankton samples collected from four floodplain lakes (beels) of Barpeta district of lower Brahmaputra river basin, Assam state, northeastern India (NEI) revealed eighteen rotifer species of biodiversity and biogeographic interest belonging to five families and six genera. One species is new to the Indian Rotifera and one species is new to Assam. Our collections are characterized by two Australasian elements, five Oriental endemics, seven paleotropical species, and one cosmo (sub) tropical species. Nine species, restricted to date to NEI, are examples of regional distribution importance in India while six species depicted disjunct distribution in the country. Interestingly, seven species are categorized as Eastern hemisphere elements. All the taxa are illustrated to warrant validation as an increasing magnitude of 'unverifiable records' is a serious impediment for the progress of rotifer biodiversity in India.

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The diversity and distribution of Lepadellidae (Rotifera: Eurotatoria: Monogononta) of India

Sharma

2014

Internat. Rev. Hydrobiol.

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The status of diversity of Lepadellidae of India is reviewed based on our studies and the published literature and 42 valid species are reported. These comprise ∼26.0 and 71.0% of the richness of the family known globally and from the Oriental region, respectively, and nearly 10.3% of the Indian Rotifera. One species is new to India and one species is new to northeast India (NEI). The interesting taxa include one Oriental endemic, two Indian endemics, and four Paleotropical species, while several species exhibit regional distributional importance. Low endemicity and richness of cosmopolitan species (∼76.0%) are characteristics of the Indian Lepadellidae. This taxon is relatively more known from certain states of northeast, east, and south India but remains poorly studied from rest of this country. An update on Lepadellidae from India, and the Himalayan region and Western Ghats “hot‐spots” in particular; and analysis of cryptic diversity in Colurella adriatica – colurus, C. obtusa, C. uncinata, Lepadella acuminata, L. ovalis, and L. patella merit further interest for the rotifer biodiversity and biogeography.

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Northeast India: An important region with a rich biodiversity of Rotifera

Cited by 13 publications

References 37 publications

Zooplankton Diversity of Three Floodplain Lakes (Beels) of the Majuli River Island, Brahmaputra River Basin of Assam, Northeast India

Zooplankton Diversity of Three Floodplain Lakes (Beels) of the Majuli River Island, Brahmaputra River Basin of Assam, Northeast India

Interesting rotifers (Rotifera: Eurotatoria) from floodplain lakes of lower Brahmaputra river basin of Assam, northeast India

The diversity and distribution of Lepadellidae (Rotifera: Eurotatoria: Monogononta) of India

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