Changes in species composition of cyanobacterial and microalgal communities along a temperature gradient in Tapovan Hot Spring, Garhwal Himalaya, Uttarakhand, India

Ikram, Sana F.; Uniyal, Vaishnavi; Kumar, Dhananjay

doi:10.1007/s10452-021-09921-x

Cited by 3 publications

(2 citation statements)

References 28 publications

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“…Our results align with other studies that found similar patterns of distinct communities associated with distance from freshwater sources such as riverine input or glacial melt (Giménez et al 2010;Hossain, Marshall, and Hall-Spencer 2019;McCabe and Konar 2021). This pattern of disparate communities among habitats that lie along a gradient of abiotic stress is not unique to salinity alone; documented differences in species composition have also been shown for freshwater phytoplankton communities along a thermal gradient, plant communities along an elevation gradient, and butterfly species in areas of low and high rainfall, to name a few (Beirão et al 2017;Hailemariam and Temam 2020;Ikram, Uniyal, and Kumar 2022). Despite the importance of identifying differences in species composition among regions of varying environmental conditions, teasing apart the relative importance of whether indirect or direct impacts of abiotic stress in driving these patterns is challenging for purely observational datasets.…”

Section: Herbivore Exclusion Experimentssupporting

confidence: 88%

Salinity controls rocky intertidal community structure via suppression of herbivory

Coyle¹,

Emry²,

Kordas³

et al. 2023

Preprint

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Climate change impacts ecosystems directly through differences in species specific responses as well as indirectly through changes to the strength of species interactions. To predict how species will be impacted by ongoing environmental change, we need to better understand the relative roles of these direct and indirect effects. Salinity is a strong driver of ecological patterns and processes, and salinity regimes in coastal regions are expected to be altered by climate change through intensification of the hydrological cycle and via climate-driven shifts in the timing and strength of the spring freshet. We hypothesized that hyposalinity can indirectly affect the intertidal community by excluding a dominant herbivore. To test this hypothesis, we 1) conducted intertidal diversity surveys in regions of high vs. seasonally low salinity in the Strait of Georgia, British Columbia, 2) conducted laboratory salinity tolerance trials for two important grazers (Lottia pelta and Lottia digitalis) and one primary producer (Ulva sp.), and 3) experimentally manipulated the abundance of grazers in these two regions. We show that rocky intertidal shores from two regions of disparate salinity regimes are distinct in their intertidal communities: low salinity sites were composed primarily of Mytilus trossulus, Fucus distichus and Ulva sp., whereas high salinity sites were dominated by Chthamalus dalli, Lottia spp., and Mastocarpus sp. Our laboratory trials confirmed that freshwater inputs experienced in the low salinity region resulted in hyposaline levels which exceeded the tolerance of Lottia spp., but not that of Ulva sp. Further, we show that by excluding grazers in high salinity sites, these communities more closely resemble that of the low salinity sites than they do of other high salinity sites with grazers present. Together, these results demonstrate that the pattern of distinct estuarine intertidal communities in low vs. high salinity regions in the Strait of Georgia may be largely driven by the indirect effects of freshwater inputs, mediated by salinity-driven differences in herbivore population size and thus grazing pressure.

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Section: Herbivore Exclusion Experimentssupporting

confidence: 88%

Salinity controls rocky intertidal community structure via suppression of herbivory

Coyle¹,

Emry²,

Kordas³

et al. 2023

Preprint

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“…Cyanobacteria was detected in Bantang hot spring. Cyanobacteria was reported by previous workers also in several hot springs in Tapovan hot spring 37 , Rupite hot spring 38 , and two alkaline hot springs in Yellowstone National Park 39 . Phototrophic bacteria present in hot springs may propel the entire microbial ecosystem.…”

Section: Discussionsupporting

confidence: 57%

Comparative analysis of bacterial diversity in two hot springs in Hefei, China

Zhang

Liu

Chen

2023

Sci Rep

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Hot springs are extreme ecological environments of microbes. The study is the first comparative analysis of bacterial diversity of Tangchi and Bantang hot spring water samples collected in Hefei, China, which is conducive to the further development and utilization of microbial resources in hot springs. Illumina MiSeq system was utilized to sequence and analyze the bacterial 16S rRNA gene from hot spring water samples by bioinformatics, to probe into the bacterial abundance and diversity of two hot springs in Hefei. Results revealed that prevalent bacterial phyla in Tangchi hot spring were Bacillota and Aquificota, and the prevalent bacterial genus was Hydrogenobacter; prevalent phyla in Bantang hot spring were Pseudomonadota followed by Actinobacteriota, and prevalent genera were CL500-29_marine_group and Polynucleobacter. More species and higher evenness in Bantang hot spring than those in Tangchi hot spring. In MetaCyc pathway analysis, the major pathways of metabolism existed in the bacteria from the two hot springs were ‘pyruvate fermentation to isobutanol (engineered)’, ‘acetylene degradation’, ‘carbon fixation pathways in prokaryotes’, ‘nitrate reduction I (denitrification)’, ‘methanogenesis from acetate’, ‘superpathway of glucose and xylose degradation’, etc.

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Prospects and constraints in studying the biodiversity of agriculturally important microalgae and cyanobacteria and useful statistical tools

et al. 2022

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Changes in species composition of cyanobacterial and microalgal communities along a temperature gradient in Tapovan Hot Spring, Garhwal Himalaya, Uttarakhand, India

Cited by 3 publications

References 28 publications

Salinity controls rocky intertidal community structure via suppression of herbivory

Salinity controls rocky intertidal community structure via suppression of herbivory

Comparative analysis of bacterial diversity in two hot springs in Hefei, China

Prospects and constraints in studying the biodiversity of agriculturally important microalgae and cyanobacteria and useful statistical tools

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