Coupling high-resolution measurements to a three-dimensional lake model to assess the spatial and temporal dynamics of the cyanobacterium Planktothrix rubescens in a medium-sized lake

Carraro, Elisa; Guyennon, Nicolas; Hamilton, David P.; Valsecchi, Lucia; Manfredi, Emanuela Chiara; Viviano, Gaetano; Salerno, Franco; Tartari, Gianni; Copetti, Diego

doi:10.1007/978-94-007-5790-5_7

Cited by 11 publications

(14 citation statements)

References 62 publications

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“…This scenario is dependent on an interaction between storm intensity and timing with lake morphology and characteristics such as water clarity that facilitate the development of cyanobacteria in a DCM. Clear-water lakes that regularly develop DCMs during summer stratification are becoming more prevalent as measures taken to reduce eutrophication are increasingly taking effect (Conley et al, 2009;Carraro et al, 2012). The scenario mimicked in our experiment may hence foreshadow a major challenge faced by future lake management: If more frequent in the future, severe storms could trigger cyanobacterial blooms and declines in water transparency precisely in those nutrient-poor lakes of high conservation value that previously escaped, or have recovered from, heavy impacts by anthropogenic forcing.…”

Section: Discussionmentioning

confidence: 78%

Thermocline deepening boosts ecosystem metabolism: evidence from a large‐scale lake enclosure experiment simulating a summer storm

Giling

Nejstgaard

Berger

et al. 2016

Global Change Biology

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Extreme weather events can pervasively influence ecosystems. Observations in lakes indicate that severe storms in particular can have pronounced ecosystem-scale consequences, but the underlying mechanisms have not been rigorously assessed in experiments. One major effect of storms on lakes is the redistribution of mineral resources and plankton communities as a result of abrupt thermocline deepening. We aimed at elucidating the importance of this effect by mimicking in replicated large enclosures (each 9 m in diameter, ca. 20 m deep, ca. 1300 m in volume) a mixing event caused by a severe natural storm that was previously observed in a deep clear-water lake. Metabolic rates were derived from diel changes in vertical profiles of dissolved oxygen concentrations using a Bayesian modelling approach, based on high-frequency measurements. Experimental thermocline deepening stimulated daily gross primary production (GPP) in surface waters by an average of 63% for >4 weeks even though thermal stratification re-established within 5 days. Ecosystem respiration (ER) was tightly coupled to GPP, exceeding that in control enclosures by 53% over the same period. As GPP responded more strongly than ER, net ecosystem productivity (NEP) of the entire water column was also increased. These protracted increases in ecosystem metabolism and autotrophy were driven by a proliferation of inedible filamentous cyanobacteria released from light and nutrient limitation after they were entrained from below the thermocline into the surface water. Thus, thermocline deepening by a single severe storm can induce prolonged responses of lake ecosystem metabolism independent of other storm-induced effects, such as inputs of terrestrial materials by increased catchment run-off. This highlights that future shifts in frequency, severity or timing of storms are an important component of climate change, whose impacts on lake thermal structure will superimpose upon climate trends to influence algal dynamics and organic matter cycling in clear-water lakes.

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Section: Discussionmentioning

confidence: 78%

Thermocline deepening boosts ecosystem metabolism: evidence from a large‐scale lake enclosure experiment simulating a summer storm

Giling

Nejstgaard

Berger

et al. 2016

Global Change Biology

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“…Algal groups that reportedly can be discriminated by the FluoroProbe include (i) “green” (Chlorophyta and Euglenophyta), (ii) “mixed” or “brown” (Haptophyta, Bacillariophyceae, Chrysophyceae, Dinophyceae), (iii) “blue” (Cyanobacteria), and (iv) “red” (Cryptophyta). The FluoroProbe has been adopted across a broad range of aquatic ecosystems for rapid estimation of phytoplankton biomass (e.g., Carraro et al ; Houliez et al ; Perga et al ).…”

Section: Methodsmentioning

confidence: 99%

Diversity and spatial distribution of autotrophic communities within and between ice‐covered Antarctic lakes (McMurdo Dry Valleys)

Dolhi

Teufel

Kong

et al. 2015

Limnology & Oceanography

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We compared the spatial distribution and diversity of autotrophic microbial communities among four permanently ice-covered, chemically stratified lakes located in the Taylor (Lakes Bonney-east and west lobes, Fryxell), and Wright (Lake Vanda) Valleys of the McMurdo Dry Valleys (Victoria Land, Antarctica). Clone libraries were constructed for major carbon fixation genes (rbcL isoforms IA/B and ID; cbbM; nifJ). Real time quantitative polymerase chain reaction assays were also developed for each of these markers of autotrophy to assess the influence of lake physicochemical factors on spatial trends in major photosynthetic and chemolithoautotrophic groups. Both lobes of Lake Bonney were dominated by Ribulose-1, 5-bisphosphate carboxylase oxygenase (RubisCO) form ID rbcL (haptophytes and stramenopiles), while Lake Fryxell was dominated by rbcL form ID-harboring cryptophytes. Lake Vanda was the least productive lake and was dominated by form IA/B rbcL (cyanobacteria and chlorophytes) and form ID rbcL (stramenopiles). Autotrophic carbon fixation genes from photosynthetic organisms were generally positively correlated with light availability. Chemolithoautotrophic organisms harboring form II RubisCO were detected in only two of the four lakes (west lobe Lake Bonney and Fryxell) and were associated with the presence of either sulfide (Fryxell) or dimethylated sulfur compounds (west lobe Lake Bonney).

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“…The Mann-Kendall test (MK) (Mann, 1945;Kendall, 1975) is widely used to assess significant trends in hydro-meteorological time series (e.g., Zhang et al, 2000;Yue and Wang, 2002;Carraro et al, 2012aCarraro et al, , 2012bGuyennon et al, 2013). This test is non-parametric and is therefore less sensitive to extreme sample values.…”

Section: Analysis Of Climatic Trendsmentioning

confidence: 99%

High alpine ponds shift upwards as average temperatures increase: A case study of the Ortles–Cevedale mountain group (Southern Alps, Italy) over the last 50years

Salerno

Gambelli

Viviano

et al. 2014

Global and Planetary Change

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Coupling high-resolution measurements to a three-dimensional lake model to assess the spatial and temporal dynamics of the cyanobacterium Planktothrix rubescens in a medium-sized lake

Cited by 11 publications

References 62 publications

Thermocline deepening boosts ecosystem metabolism: evidence from a large‐scale lake enclosure experiment simulating a summer storm

Thermocline deepening boosts ecosystem metabolism: evidence from a large‐scale lake enclosure experiment simulating a summer storm

Diversity and spatial distribution of autotrophic communities within and between ice‐covered Antarctic lakes (McMurdo Dry Valleys)

High alpine ponds shift upwards as average temperatures increase: A case study of the Ortles–Cevedale mountain group (Southern Alps, Italy) over the last 50years

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