Concordance of chemically inferred and assayed nutrient limitation of phytoplankton along a depth gradient of alpine lakes in the Canadian Rockies

2019 ◽  
Vol 82 (1) ◽  
Author(s):  
Jenna Cook ◽  
Blake R. Stuparyk ◽  
Mitchell A. Johnsen ◽  
Rolf D. Vinebrooke
Keyword(s):  
Nutrient Limitation ◽  
Alpine Lakes ◽  
Depth Gradient ◽  
Canadian Rockies

Groundwater exchange with two small alpine lakes in the Canadian Rockies

2008 ◽  
Vol 22 (15) ◽  
pp. 2838-2846 ◽  
Author(s):  
James W. Roy ◽  
Masaki Hayashi
Keyword(s):  
Alpine Lakes ◽  
Canadian Rockies ◽  
Groundwater Exchange

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.

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.

scholarly journals Effects of oligotrophication on primary production in peri-alpine lakes

2013 ◽  
Vol 49 (8) ◽  
pp. 4700-4710 ◽  
Author(s):  
David Finger ◽  
Alfred Wüest ◽  
Peter Bossard
Keyword(s):  
Primary Production ◽  
Alpine Lakes

scholarly journals Metabolic response of Botryococcus braunii to high bicarbonate dosages and other conditions: analysis of photosynthetic performance, productivity, and lipidomic profile

2021 ◽  
Author(s):  
Néstor David Giraldo ◽  
Sandra Marcela Correa ◽  
Andrés Arbeláez ◽  
Felix L. Figueroa ◽  
Rigoberto Ríos-Estepa ◽  
...  
Keyword(s):  
Nutrient Limitation ◽  
Metabolic Response ◽  
Neutral Lipids ◽  
Biomass Productivity ◽  
Botryococcus Braunii ◽  
Photosynthetic Performance ◽  
Lipid Productivity ◽  
Cellular Growth ◽  
Adaptive Responses ◽  
Nitrogen And Phosphorus

AbstractIn this study the metabolic responses of Botryococcus braunii were analyzed upon different inorganic carbon dosages and nutrient limitation conditions in terms of lipid and biomass productivity, as well as photosynthetic performance. The nutritional schemes evaluated included different levels of sodium bicarbonate and nitrogen and phosphorus starvation, which were contrasted against standard cultures fed with CO2. Bicarbonate was found to be an advantageous carbon source since high dosages caused a significant increase in biomass and lipid productivity, in addition to an enhanced photosynthetic quantum yield and neutral lipids abundance. This contrasts to the commonly used approach of microalgae nutrient limitation, which leads to high lipid accumulation at the expense of impaired cellular growth, causing a decline in overall lipid productivity. The lipidome analysis served to hypothesize about the influence of the nutritional context on B. braunii structural and storage lipid metabolism, besides the adaptive responses exhibited by cells that underwent nutrient stress.

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