Nutrient status, algal and cyanobacterial flora of six fresh water streams of Schirmacher Oasis, Antarctica

Pandey, Kapil Deo; Kashyap, A. K.; Gupta, Rajan Kumar

doi:10.1007/bf00016888

Cited by 17 publications

(9 citation statements)

References 9 publications

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“…On glacial surfaces, microorganisms are often exposed to light, nutrients, water, and a temperature of around 0 1C in summer, which facilitates the growth of phototrophic cyanobacteria. By contrast, in the deep snow and ice, where the temperature abruptly drops to À 8 to À 56 1C (Salamatin et al, 1998;Thompson et al, 2000;Johnsen et al, 2002), the snow cover limits the ambient light intensity and thus reduces the growth rate of cyanobacteria, which are light-dependent species (Pandey et al, 1995;Takeuchi & Kohshima, 2004). Therefore, it is not surprising that a shift in microbial communities from the prevalent phototrophs in the surface snow to the dominant heterotrophs in the deep snow occurs in the Kuytun 51 Glacier.…”

Section: Difference In Bacterial Phylogenetic Composition Between Surmentioning

confidence: 99%

Deposition and postdeposition mechanisms as possible drivers of microbial population variability in glacier ice

Xiang

Shang

Chen

et al. 2009

FEMS Microbiology Ecology

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Glaciers accumulate airborne microorganisms year by year and thus are good archives of microbial communities and their relationship to climatic and environmental changes. Hypotheses have focused on two possible drivers of microbial community composition in glacier systems. One is aeolian deposition, in which the microbial load by aerosol, dust, and precipitation events directly determines the amount and composition of microbial species in glacier ice. The other is postdepositional selection, in which the metabolic activity in surface snow causes microbial community shifts in glacier ice. An additional possibility is that both processes occur simultaneously. Aeolian deposition initially establishes a microbial community in the ice, whereas postdeposition selection strengthens the deposition patterns of microorganisms with the development of tolerant species in surface snow, resulting in varying structures of microbial communities with depth. In this minireview, we examine these postulations through an analysis of physical-chemical and biological parameters from the Malan and Vostok ice cores, and the Kuytun 51 Glacial surface and deep snow. We discuss these and other recent results in the context of the hypothesized mechanisms driving microbial community succession in glaciers. We explore our current gaps in knowledge and point out future directions for research on microorganisms in glacial ecosystems.

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Section: Difference In Bacterial Phylogenetic Composition Between Surmentioning

confidence: 99%

Deposition and postdeposition mechanisms as possible drivers of microbial population variability in glacier ice

Xiang

Shang

Chen

et al. 2009

FEMS Microbiology Ecology

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“…Primary production is the main source of organic matter in glacial streams above the treeline ( Howard‐Williams et al . 1986 ;Suren & Winterbourn 1991;Milner & Petts 1994;Pandey, Kashyap, & Gupta 1995), and thus may affect macroinvertebrate composition and population dynamics ( Winterbourn & Ryan 1994) as well as ecosystem function. Furthermore, Dobson & Hildrew (1992) suggested that leaf litter may be a limiting resource (as are habitat and food) for shredding insects in lowland streams; similar conditions may exist in glacial streams lacking riparian inputs.…”

Section: Introductionmentioning

confidence: 99%

Leaf breakdown and associated macroinvertebrates in alpine glacial streams

1998

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1. The relationship between macroinvertebrate assemblages and the breakdown of alder [Alnus viridis (Chaix), Dc.] leaves was examined by exposing leaf packs in four streams in an alpine glacial floodplain over 8 months. Although glacially fed, the four sites (pro‐glacial, glacial lake outlet, main channel, and a side‐channel with a mix of water sources) differed physically and contained different benthic communities. 2. Leaf breakdown and associated fungal properties differed widely among sites. Leaf decay rate varied by an order of magnitude (k ranged from 0.0029 to 0.0305 day–1), and was fastest at the lake outlet (< 20% leaf mass remaining by day 45) and slowest at the pro‐glacial site (> 75% remaining on day 45). Rapid processing at the lake outlet was because of the presence of Acrophylax zerberus Brauer, a shredding caddisfly. 3. There were few macroinvertebrate taxa at the pro‐glacial site (two to four taxa present in packs) and leaf breakdown was attributed primarily to micro‐organisms. Leuctra abundance in leaf packs was strongly correlated with fungal biomass but not with the sporulation activity of any specific aquatic hyphomycete. Other taxa, such as Baetis and chironomids, showed no relationship with any leaf characteristic, suggesting that leaf packs were used mainly as a habitat and not as a food resource. 4. The predatory stonefly Isoperla was significantly associated with the abundance of macroinvertebrate prey (Baetis, Chironomidae and Leuctra) in leaf packs at the main and side‐channel sites. The results indicate that leaf breakdown can vary widely in alpine lotic environments, reflecting site‐specific differences in habitat characteristics, and in macroinvertebrate and fungal composition.

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“…The low concentration of Cr was found in water (0.23 mgL −1 ) at site S 5 which may be due to its low solubility. Pandey et al (1995) revealed almost coinciding findings. Enrichment of chromium in particulate matter may be due to the mixing of domestic and industrial waste inputs.…”

Section: Resultsmentioning

confidence: 78%

Preliminary assessment of heavy metals in water, sediment and macrophyte (Lemna minor) collected from Anchar Lake, Kashmir, India

2018

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Water samples, sediments and free floating macrophytic plant, Lemna minor specimens were collected from five designated sites in Anchar lake (Srinagar, J&K, India) to assess its heavy metal (Cu, Cr, Zn, Ni, Cd, Pb) load and changes on seasonal basis. The concentration of heavy metals was determined using atomic absorption spectroscopy. Most of the samples were found within limits of maximum permissible concentrations as recommended by WHO (Guidelines for drinking water quality, pp [491][492][493] 2006). During all the seasons, highest concentration of all heavy metals (Cu, Cr, Zn, Ni, Cd, Pb) was recorded at highly polluted sites of the lake viz. near agricultural fields (S 1 ), near settlements (S 3 ) and SKIMS (S 4 ). These sites received huge agrochemical run-off from the surrounding agricultural fields, solid and liquid wastes from the nearby catchment areas and effluents from Sher-e-Kashmir Institute of Medical Sciences (SKIMS) compared to control site lake centre (S 5 ). Furthermore, most of the metals in water and sediment were found with highest concentration during autumn (Viz., Cu-1.5 ppm; Zn-0.38 ppm; Ni-1.89 ppm; Pb-0.84 ppm in water and Cu-26.9 ppm; Zn-13.6 ppm; Pb-4.33 ppm in sediment) and summer (Viz., Cr-0.68 ppm in water and Ni-4.8 ppm; Cd-2.6 ppm; Cr-8.01 ppm in sediment) seasons. Also in Lemna minor plant highest concentration was observed during summer season (Cu-29.09 ppm; Zn-19.11 ppm; Ni-5.7 ppm; Cd-1.34 ppm; Cr-9.18 ppm and Pb-9.77 ppm). From these observations, it was found that the sources of heavy metals in Anchar lake were both natural and anthropogenic ones. This study recommended that continuous monitoring of heavy metals (Viz; Cu, Cr, Zn, Ni, Cd and Pb) in water, sediment and other aquatic biota of Anchar lake should be directed to protection of ecological status of the lake and its surrounding area.

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Nutrient status, algal and cyanobacterial flora of six fresh water streams of Schirmacher Oasis, Antarctica

Cited by 17 publications

References 9 publications

Deposition and postdeposition mechanisms as possible drivers of microbial population variability in glacier ice

Deposition and postdeposition mechanisms as possible drivers of microbial population variability in glacier ice

Leaf breakdown and associated macroinvertebrates in alpine glacial streams

Preliminary assessment of heavy metals in water, sediment and macrophyte (Lemna minor) collected from Anchar Lake, Kashmir, India

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