scholarly journals The Light-to-Nutrient Ratio in Alpine Lakes: Different Scenarios of Bacterial Nutrient Limitation and Community Structure in Lakes Above and Below the Treeline

2021 ◽  
Author(s):  
Yaling Su ◽  
Yingxun Du ◽  
Peng Xing
Keyword(s):  
Community Structure ◽  
Nutrient Limitation ◽  
Alpine Lakes ◽  
Nutrient Ratio

scholarly journals Ciliate community structure and interactions within the planktonic food web in two alpine lakes of contrasting transparency

2016 ◽  
Vol 61 (11) ◽  
pp. 1950-1965 ◽  
Author(s):  
Barbara Kammerlander ◽  
Karin A. Koinig ◽  
Eugen Rott ◽  
Ruben Sommaruga ◽  
Barbara Tartarotti ◽  
...  
Keyword(s):  
Community Structure ◽  
Food Web ◽  
Alpine Lakes ◽  
Ciliate Community ◽  
Planktonic Food

Effects of wildfire on stream algal abundance, community structure, and nutrient limitation

2015 ◽  
Vol 34 (4) ◽  
pp. 1494-1509 ◽  
Author(s):  
Kristie Klose ◽  
Scott D. Cooper ◽  
Danuta M. Bennett
Keyword(s):  
Community Structure ◽  
Nutrient Limitation ◽  
Algal Abundance

scholarly journals The light-to-nutrient ratio in alpine lakes: different scenarios of bacterial nutrient limitation and community structure in lakes above and below the treeline

2021 ◽  
Author(s):  
Yaling Su ◽  
Yingxun Du ◽  
Peng Xing
Keyword(s):  
Nutrient Limitation ◽  
Environmental Changes ◽  
Alpine Lakes ◽  
High Light ◽  
Low Light ◽  
Bacterioplankton Community ◽  
P Limitation ◽  
Organic Carbon Concentration ◽  
C Limitation ◽  
Nutrient Conditions

Abstract The light-to-nutrient hypothesis proposes that under high light-to-nutrient conditions, bacteria tend to be limited by phosphorus (P), while under relatively low light-to-nutrient conditions, bacteria are likely driven towards carbon (C) limitation. Exploring whether this light-to-nutrient hypothesis is fitting for alpine lakes has profound implications for predicting the impacts of climatic and environmental changes on the structures and processes of aquatic ecosystems in climate-sensitive regions. We investigated the environmental conditions and bacterioplankton community compositions of 15 high-elevation lakes (7 above and 8 below treeline). High light-to-nutrient conditions (denoted by the reciprocal value of the attenuation coefficient (1/K) to total phosphorus (TP)), high chlorophyll a (Chl a) concentrations, low TP concentrations and low ratios of the dissolved organic carbon concentration to the dissolved total nitrogen concentration (DOC: DTN) were detected in above-treeline lakes. Significant positive correlations between the bacterioplankton community compositions with 1/K:TP ratios and Chl a concentrations indicated that not only high light energy but also nutrient competition between phytoplankton and bacteria might induce P limitation for bacteria. In contrast, low light-to-nutrient conditions and high allochthonous DOC input in below-treeline lakes lessen P limitation and C limitation. The most abundant genus, Polynucleobacter, was significantly enriched and more diverse oligotypes of Polynucleobacter OTUs were identified in the below-treeline lakes, indicating the divergence of niche adaptations among Polynucleobacter oligotypes. The discrepancies in the light-to-P ratio and the components of organic matter between the above-treeline and below-treeline lakes have important implications for the nutrient limitation of bacterioplankton and their community compositions.

Microbial growth, biomass, community structure and nutrient limitation in high pH and salinity soils from Pravaranagar (India)

2014 ◽  
Vol 65 ◽  
pp. 87-95 ◽  
Author(s):  
Pramod N. Kamble ◽  
Vishwas B. Gaikwad ◽  
Shashikant R. Kuchekar ◽  
Erland Bååth
Keyword(s):  
Community Structure ◽  
Nutrient Limitation ◽  
Microbial Growth ◽  
High Ph

scholarly journals Spatial Biomass Production And Seasonal Nutrient Limitation Transitions In A Tributary of The Three Gorges Reservoir, China

2021 ◽  
Author(s):  
Amechi Sampson Nwankwegu ◽  
Yiping Li ◽  
Lei Zhang ◽  
Yanan Huang ◽  
Deti Xie ◽  
...  
Keyword(s):  
Community Structure ◽  
Nutrient Limitation ◽  
Biomass Production ◽  
Three Gorges Reservoir ◽  
Phytoplankton Community ◽  
Freshwater Ecosystem ◽  
Three Gorges ◽  
Phytoplankton Community Structure ◽  
Chl A ◽  
Management Protocol

Abstract The freshwater ecosystem characteristics in terms of nutrient inventory across seasons, spatial variations of chl-a biomass, and the phytoplankton community structure are prudent ecological assessment indices for a bloom management protocol. We evaluated the spatial and seasonal chl-a distribution under different nutrient conditions and phytoplankton community structure in a eutrophic Three Gorges reservoir tributary China. Result showed significant variations in biomass production with the mainstream reaches severely affected. The nutrient addition bioassay demonstrated significant stimulations on growth in both autumn and summer. The nutrient limitation pattern shifted from P in autumn and spring to N limitation during summer. Combined additions of trace metals with N, P, and Si in autumn and Fe alone enrichment in summer and spring showed maximum productivity. The phytoplankton community structure demonstrated strong sensitivities to seasonal variabilities with regime shift from Cyanophyta, dominated by the toxic and hypoxia generating, Microcystis spp in both autumn and summer, the Cryptophyta dominated by the Chroomonas acuta in spring to the Bacilliariophyta dominated by the genera, Cyclotella in winter. This reflected the ability of the Bacilliariophyta to thrive under a low-temperature condition. Combined N&P led to significant growth stimulation in summer while P alone controlled the bulk of the growth in autumn. The study points to the need for extending mitigation steps to the mainstream towards achieving lasting bloom management solution in the impacted tributary.

Effects of Gammarus lacustris (Crustacea: Amphipoda) on plankton community structure in an alpine lake

1999 ◽  
Vol 56 (8) ◽  
pp. 1401-1408 ◽  
Author(s):  
Frank M Wilhelm ◽  
David W Schindler
Keyword(s):  
Community Structure ◽  
Alpine Lakes ◽  
Plankton Community ◽  
Alpine Lake ◽  
Canadian Rockies ◽  
Gammarus Lacustris ◽  
Enclosure Experiments ◽  
Daphnia Middendorffiana ◽  
Plankton Community Structure

The amphipod Gammarus lacustris is generally considered as a herbivore or a detritivorous scavenger, but we and others have observed it preying on pelagic zooplankton in fishless alpine lakes of the Canadian Rockies. We tested the hypothesis that G. lacustris predation alters the plankton community structure of alpine lakes by manipulating G. lacustris density in large (2800 L) in situ enclosure experiments. Compared with control enclosures (no Gammarus), Daphnia middendorffiana abundance was reduced 49, 85, and 100% in the low, medium, and high (40, 200, and 400 individuals·m-2) Gammarus density enclosures, respectively. Hesperodiaptomus arcticus density was not significantly related to G. lacustris density. Comparison of mesocosm results with lake data showed that G. lacustris predation on D. middendorffiana in the lake was lower, possibly because a pelagic deepwater refugium allows Daphnia to escape predation. The results show that G. lacustris predation can affect the plankton community structure in small fishless alpine lakes.

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