A new species of <i>Germainiella</i> (Bacillariophyta) from the <i>Myristica</i> swamps of the Western Ghats, India

Thacker, Mital; Roy, Surajit; Kociolek, John Patrick; Lowe, Rex L.; Karthick, Balasubramanian

doi:10.1080/0269249x.2019.1671236

Cited by 3 publications

(3 citation statements)

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“…It seems likely that this feature of asymmetry about both the apical and transapical axes in members of the Cymbellales has been achieved independently many times, rather than a feature that is diagnostic for a natural group of taxa. Recently many novel taxa representing multiple lineages of diatoms were described from Asia, in particular, tropical Asia (Glushchenko et al 2019a, b;Thacker et al 2019;Liu et al 2019;Roy et al 2019;Kulikovskiy et al 2020). These discoveries confirm that Asia is the hotspot of diatom diversification as proposed by Kociolek (2019) and the same finding need to be strengthened using molecular phylogenetic tools.…”

Section: Discussionmentioning

confidence: 82%

A new freshwater Gomphonema Ehrenberg (Bacillariophyta) species from Eastern Himalayas, India

Radhakrishnan¹,

Das²,

Kumar³

et al. 2020

Fottea

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A new freshwater diatom species, Gomphonema adhikarii sp. nov., is described from a small roadside pool from the alpine region of Arunachal Pradesh, Eastern Himalayas, India. Detailed valve morphological features, based on both light and scanning electron microscopy, is presented and this taxon is compared with similar species. Gomphonema adhikarii has a distinct asymmetry about the apical axis and slightly bent foot pole area. The outline of the valve is slightly undulate, the valve centre is swollen and both apices are broadly rounded. This new species described from the Eastern Himalayas supports the idea of the area being rich in biodiversity, even with respect to the freshwater diatom flora.

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Section: Discussionmentioning

confidence: 82%

A new freshwater Gomphonema Ehrenberg (Bacillariophyta) species from Eastern Himalayas, India

Radhakrishnan¹,

Das²,

Kumar³

et al. 2020

Fottea

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“…In spite of the fact that diatom can prove an excellent bioindicator to monitor this vanishing ecosystem, there is no comprehensive study on diatoms from this region, except a discovery of a new species Germainiella chandranii [21]. The present research focuses on documenting the diatom assemblage structure inside Myristica swamps to determine the environmental optima and tolerances of species to the limnological variables, especially across disturbance gradients.…”

Section: Introductionmentioning

confidence: 98%

“…The macroscopic flora studied by Krishnamoorthy [3]; Chandran et al [16]; Bhat and Kaveriappa [14]; Roby et al [17] indicate that these swamps typically display high floristic endemism, with studies recording 23 tree species endemics to these swamps. Many endemic biotas have been discovered inside these swamps in the last two decades, including many new species of frogs [18], mushrooms [19], butterflies [20], and diatoms [21]. Refer Ranganathan et al [4] for a detailed review of the biodiversity of Myristica swamps.…”

Section: Introductionmentioning

confidence: 99%

Response of Diatoms to the Changing Water Quality in the Myristica Swamps of the Western Ghats, India

Thacker

Karthick

2022

Diversity

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Myristica swamps are one of the rarest wetland ecosystems within the sub-tropical evergreen forests of the Western Ghats, India. As their name indicates, they harbor trees belonging to the ancient family Myristicaceae. Due to the waterlogged conditions and high humic decomposition, these swamps are acidic, harbor rare and endemic biotas, and provide ecosystem services to humans. Monitoring this rare ecosystem is crucial because the swamps that once formed a large hydrological network across the Western Ghats are now confined to isolated patches due to human disturbance such as agricultural interventions, roads, and dam construction. Due to the change in land use, there is also a drastic change in water chemistry and associated biodiversity. Biomonitoring is more precise than physical and chemical monitoring. So, the current study aimed to undertake a comprehensive analysis of the physical, chemical, and biological assessment of these swamps. The diatom assemblages are strongly affected by water chemistry and serve as a powerful indicator of environmental changes in the freshwater aquatic systems. However, there is no information on diatom assemblages in these swamps, and the present study aimed to determine the diatom assemblage structure in the Myristica swamps and their response to changing water quality. Diatom samples were taken at 17 different swamps across the central Western Ghats, and a set of environmental parameters was evaluated. Analysis revealed a total of 91 species of diatoms belonging to 27 genera across the 17 sites, from which 44 diatom species showed restricted distribution to this unique environment. Overall, the dominant diatom genera inside the swamps included, Navicula (19.8%), Gomphonema (16%), Eunotia (13.3%), Ulnaria (9.4%), Achnanthidium (8%), Frustulia (6.2%), Planothidium (5.2%), and Brachysira (2.8%). High diatom species richness was observed in the swamps having less anthropogenic disturbance, and diatom assemblage composition was primarily determined by dissolved oxygen, pH, and conductivity. The significant number of geographically restricted taxa in this study points towards our limited understanding of this tropical biome and calls for a dire need for more studies from here, not only to improve our knowledge concerning the diversity, ecology, and biogeography of these diatoms but to further encourage their use in applied (paleo) environmental sciences. Our results indicate that diatoms can prove useful environmental indicators even in harsh environments like swamps and can be a potential tool for assessing ecological and climatic change.

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A review of research and conservation of Myristica swamps, a threatened freshwater swamp of the Western Ghats, India

Ranganathan

Ravikanth

Aravind

2021

Wetlands Ecol Manage

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A new species of Germainiella (Bacillariophyta) from the Myristica swamps of the Western Ghats, India

Cited by 3 publications

References 10 publications

A new freshwater Gomphonema Ehrenberg (Bacillariophyta) species from Eastern Himalayas, India

A new freshwater Gomphonema Ehrenberg (Bacillariophyta) species from Eastern Himalayas, India

Response of Diatoms to the Changing Water Quality in the Myristica Swamps of the Western Ghats, India

A review of research and conservation of Myristica swamps, a threatened freshwater swamp of the Western Ghats, India

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