Sedimentary pigments as indicators of cyanobacterial dynamics in a hypereutrophic lake

Deshpande, Bethany; Tremblay, R R; Pienitz, Reinhard; Vincent, Warwick F.

doi:10.1007/s10933-014-9785-3

Cited by 34 publications

(15 citation statements)

References 43 publications

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“…The Chl a / Phe a ratio was used to assess pigment preservation in lake sediments, and ratios are expected to remain relatively stable over time if stabile preservation conditions occur 40 . Taxon-specific pigments were used to indicate the biomass of aquatic primary producer’s classes: lutein (Lut) for green algae (Chlorophyceae), fucoxanthin (Fuco) for diatoms (Bacillariophyceae), alloxanthin (Allo) for cryptophytes (Cryptophyteae 39 ,) and canthaxanthin (Cantha) for cyanobacteria (Cyanophyceae 41 ,). Pigment concentrations are expressed as nanomoles per gram of sediment organic matter (nmol g −1 OM).…”

Section: Methodsmentioning

confidence: 99%

Climate-induced changes in carbon flows across the plant-consumer interface in a small subarctic lake

Belle¹,

Nilsson²,

Tõnno³

et al. 2019

Sci Rep

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Reconstructions of past food web dynamics are necessary for better understanding long-term impacts of climate change on subarctic lakes. We studied elemental and stable isotopic composition of sedimentary organic matter, photosynthetic pigments and carbon stable isotopic composition of Daphnia (Cladocera; Crustacea) resting eggs (δ13CClado) in a sediment record from a small subarctic lake. We examined how regional climate and landscape changes over the last 5800 years affected the relative importance of allochthonous and autochthonous carbon transfer to zooplankton. Overall, δ13CClado values were well in line with the range of theoretical values of aquatic primary producers, confirming that zooplankton consumers in subarctic lakes, even in the long-term perspective, are mainly fuelled by autochthonous primary production. Results also revealed greater incorporations of benthic algae into zooplankton biomass in periods that had a warmer and drier climate and clearer water, whereas a colder and wetter climate and lower water transparency induced higher contributions of planktonic algae to Daphnia biomass. This study thus emphasizes long-term influence of terrestrial-aquatic linkages and in-lake processes on the functioning of subarctic lake food webs.

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Section: Methodsmentioning

confidence: 99%

Climate-induced changes in carbon flows across the plant-consumer interface in a small subarctic lake

Belle¹,

Nilsson²,

Tõnno³

et al. 2019

Sci Rep

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“…Lake St. Augustin (46º 42'N, 71º 22'W) is a small (0.63 km 2 ) and shallow (average depth of 3.5 m) lake located on the outskirts of Quebec City (Figure 1). In the past two centuries, the lake has been exposed to the effects of intensified farming and urbanization (Deshpande et al, 2014) and became eutrophic by the mid-twentieth century. Currently, the lake is still classified as eutrophic to hypereutrophic, with total phosphorus concentrations (TP) between 20-160 µg L -1 and summertime chlorophyll-a (Chl-a) concentrations between and 60 µg L -1 .…”

Section: Study Site and Regional Climatementioning

confidence: 99%

Effects of climate change and episodic heat events on cyanobacteria in a eutrophic polymictic lake

Bartosiewicz

Przytulska

Deshpande

et al. 2019

Science of The Total Environment

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Mixing regime and CO 2 availability may control cyanobacterial blooms in polymictic lakes, but the underlying mechanisms still remain unclear. We integrated detailed results from a natural experiment comprising an average-wet year (2011) and one with heat waves (2012), a long-term meteorological dataset , historical phosphorus concentrations and sedimentary pigment records, to determine the mechanistic controls of cyanobacterial blooms in a eutrophic polymictic lake. Intense warming in 2012 was associated with: 1) increased stability of the water column with buoyancy frequencies exceeding 40 cph at the surface, 2) high phytoplankton biomass in spring (up to 125 mg WW L -1 ), 3) reduced downward transport of heat and 4) depleted epilimnetic CO 2 concentrations. CO 2 depletion was maintained by intense uptake by phytoplankton (influx up to 30 mmol m -2 d -1 ) in combination with reduced, internal and external, carbon inputs during dry, stratified periods. These synergistic effects triggered bloom of buoyant cyanobacteria (up to 300 mg WW L -1 ) in the hot year. Complementary evidence from polynomial regression modelling using historical data and pigment record revealed that warming explains 78% of the observed trends in cyanobacterial biomass, whereas historical phosphorus concentration only 10% thereof. Together the results from the natural experiment and the longterm record indicate that effects of hotter and drier climate are likely to increase water column stratification and decrease CO 2 availability in eutrophic polymictic lakes. This combination will catalyze blooms of buoyant cyanobacteria.

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“…4). Canthaxanthin is a marker of the nitrogen-fixing cyanobacteria of the order Brought to you by | MIT Libraries Authenticated Download Date | 5/12/18 8:28 AM Nostocales (Desphande et al 2014). In polar environments, cyanobacteria are a major source of nitrogen, as they can fix this gas from the air (Chapin et al 1991;Birkemoe and Liengen 2000;Stewart et al 2011).…”

Section: Results and Interpretationmentioning

confidence: 99%

Algal pigments in Hornsund (Svalbard) sediments as biomarkers of Arctic productivity and environmental conditions

Krajewska¹,

Szymczak‐Żyła²,

Kowalewska³

2017

Polish Polar Research

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Pigments (chloropigments-a and carotenoids) in sediments and macroalgae samples, collected in Hornsund, in July 2015 and July 2016, were analysed (HPLC) in this work. In spite of the aerobic conditions and the periodic intensive solar irradiation in the Arctic environment, neither of which favour pigment preservation in water column and surface sediments, our results indicate that these compounds can provide information about phytoplankton composition, primary production and environmental conditions in this region. The sum of chloropigments-a, a marker of primary production, in the Hornsund sediments varied from 0.40 to 14.97 nmol/g d.w., while the sum of carotenoids ranged from 0.58 to 8.08 nmol/g d.w. Pheophorbides-a and pyropheophorbides-a made up the highest percentage in the sum of chloropigments-a in these sediments, supplying evidence for intensive zooplankton and/or zoobenthos grazing. Among the carotenoids, fucoxanthin and its derivatives (19'-hexanoyloxyfucoxanthin and 19'-hexanoyloxy-4-ketofucoxanthin) contributed the highest percentage, which points to the occurrence mainly of diatoms and/or haptophytes in the water. The pigment markers show that the input of macroalgae to the total biomass could be considerable only in the intertidal zone.

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Sedimentary pigments as indicators of cyanobacterial dynamics in a hypereutrophic lake

Cited by 34 publications

References 43 publications

Climate-induced changes in carbon flows across the plant-consumer interface in a small subarctic lake

Climate-induced changes in carbon flows across the plant-consumer interface in a small subarctic lake

Effects of climate change and episodic heat events on cyanobacteria in a eutrophic polymictic lake

Algal pigments in Hornsund (Svalbard) sediments as biomarkers of Arctic productivity and environmental conditions

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