Comparing key drivers of cyanobacteria biomass in temperate and tropical systems

Giani, Alessandra; Taranu, Zofia E.; Rückert, Gabriela von; Gregory‐Eaves, Irene

doi:10.1016/j.hal.2020.101859

Cited by 25 publications

(13 citation statements)

References 62 publications

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“…Water temperatures were constantly high, with negligible annual temperature oscillations, and did not play a significant role in explaining MBFG variability. Although rainy and dry conditions, instead of temperature, are the natural forcing factors determining seasonality in the tropics (Giani et al, 2020), seasonal (rainy/dry) differences in environmental filters influencing MBFG selection were not a generalized pattern among the studied lakes: of the six lakes investigated, only two showed seasonal differences in environmental filters selecting distinct MBFGs, contrary to what was expected.…”

Section: Discussioncontrasting

confidence: 59%

“…Besides eutrophication, other environmental pressures influence phytoplankton assemblage structure. For example, warming and extreme weather events, including storms and drought, may also favor the global expansion of cyanobacterial blooms (Giani et al, 2020;Havens et al, 2019;Kasprzak et al, 2017;Moss, 2011;Paerl & Huisman, 2008;Paerl et al, 2020;Stockwell et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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The influence of trophic status and seasonal environmental variability on morpho-functional traits in tropical man-made shallow lakes

Vanderley

Becker

Panosso

et al. 2022

Environ Monit Assess

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In the tropics, seasons are delimitated by the extent of rainfall resulting in seasonal differences in water parameters shaping phytoplankton community dynamics. Dry periods can intensify eutrophication and often result in seasonal or even perennial cyanobacterial dominance. This study was developed to evaluate phytoplankton response to trophic state and seasonal differences of environmental filters (dry and rainy periods) using the morphology-based functional groups (MBFG) approach. We also aimed at identifying environmental thresholds of each MBFG dominance in six man-made lakes located in the tropical semiarid region of Brazil. Our results showed clear MBFG association with lakes’ trophic states. The dominant groups in mesotrophic conditions were members of MBFGs V (unicellular flagellates) and VI (non-flagellated with a siliceous exoskeleton), and in meso-eutrophic MBFG IV (medium size without specialized traits) dominated. Conversely, MBFG VII (with mucilage and aerotopes) and VIII (nitrogen-fixing cyanobacteria) dominated mostly under eutrophic conditions, though linked to shallower euphotic zones. Light and phosphorous were the most important environmental thresholds associated with MBFG’s dominance. Overall, most of the lakes displayed seasonal differences in environmental filters. In contrast to what was expected, the rainy season was associated with higher nutrients, suspended solids, and reduced euphotic depth compared to the dry season. Our results, overall, show that the effects of seasonality varied across lakes and highlight eutrophication as the main environmental factor for MBFG selection suggesting reduced seasonality effects during dry years in the tropics.

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Section: Discussioncontrasting

confidence: 59%

Section: Introductionmentioning

confidence: 99%

The influence of trophic status and seasonal environmental variability on morpho-functional traits in tropical man-made shallow lakes

Vanderley

Becker

Panosso

et al. 2022

Environ Monit Assess

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show abstract

“…In tropical latitudes, cyanobacterial blooms in shallow eutrophic waters are more frequent and last longer when compared to their higher latitude counterparts, where key drivers such as light and temperature fluctuate seasonally (Lind et al, 2016). Indeed, in the absence of such seasonality, blooms often persist year-round in eutrophic waters (Figueredo & Giani, 2009;Figueredo et al, 2016;Batista et al, 2018;Giani et al, 2020). Yet, factors regulating cyanobacterial biomass and community composition during persistent blooms are less understood, which is, at least partly, because most information on blooms is from regions where such phenomena are seasonal (McGregor & Fabbro, 2000;Soares et al, 2009;Muir & Perissinotto, 2011;Lind et al, 2016;Ma et al, 2016;Batista et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Abiotic factors driving cyanobacterial biomass and composition under perennial bloom conditions in tropical latitudes

et al. 2021

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While warming and eutrophication have increased the frequency and magnitude of harmful cyanobacterial blooms globally, the scenario for many eutrophic tropical freshwaters is a perennial year-round bloom. Yet, the drivers of persistent blooms are less understood when conditions such as light, temperature, and nutrients favor cyanobacteria growth year-round, and especially in regions facing recurrent periods of drought. In order to understand the drivers of cyanobacteria dominance, we assessed the abiotic conditions related to the abundance and dominance of the two dominant bloom-forming genera Raphidiopsis and Microcystis, in six shallow, man-made lakes located in the semiarid Northeastern region of Brazil during a prolonged regional drought. Lower water level corresponded to increased phosphorous and nitrogen concentration and, consequently, phytoplankton biomass. Cyanobacterial biomass was also proportional to phosphorus concentrations during year-round blooms. Yet, the two dominant cyanobacterial genera, Raphidiopsis and Microcystis, seldom co-occurred temporally and the switch between them was driven by water transparency. Our results illustrate the effects of drought induced water level reductions on the biomass and composition of cyanobacterial blooms in tropical shallow man-made lakes. Given the ideal year-round conditions (i.e., high light and temperature), droughts may be expected to intensify the risk and multitude of problems associated with eutrophication.

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“…Proliferation of harmful algal blooms (HABs) consisting of microorganisms such as potentially toxic cyanobacteria has becoming an increasingly common occurrence within freshwater systems globally [ 1 ]. Anthropogenic activity and climate change has likely exacerbated HAB prevalence due to increases in significant cyanobacteria biomass drivers, including increased nutrient uptake due to urban and agricultural activity, increased water temperature, and increased mean water residence time [ 2 ]. Risks to human populations arise since water reservoirs supplying potable water often provide environments suitable for microbial colonisation.…”

Section: Introductionmentioning

confidence: 99%

A review of microscopic cell imaging and neural network recognition for synergistic cyanobacteria identification and enumeration

et al. 2022

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Real-time cyanobacteria/algal monitoring is a valuable tool for early detection of harmful algal blooms, water treatment efficacy evaluation, and assists tailored water quality risk assessments by considering taxonomy and cell counts. This review evaluates and proposes a synergistic approach using neural network image recognition and microscopic imaging devices by first evaluating published literature for both imaging microscopes and image recognition. Quantitative phase imaging was considered the most promising of the investigated imaging techniques due to the provision of enhanced information relative to alternatives. This information provides significant value to image recognition neural networks, such as the convolutional neural networks discussed within this review. Considering published literature, a cyanobacteria monitoring system and corresponding image processing workflow using in situ sample collection buoys and on-shore sample processing was proposed. This system can be implemented using commercially available equipment to facilitate accurate, real-time water quality monitoring. Graphical abstract

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Comparing key drivers of cyanobacteria biomass in temperate and tropical systems

Cited by 25 publications

References 62 publications

The influence of trophic status and seasonal environmental variability on morpho-functional traits in tropical man-made shallow lakes

The influence of trophic status and seasonal environmental variability on morpho-functional traits in tropical man-made shallow lakes

Abiotic factors driving cyanobacterial biomass and composition under perennial bloom conditions in tropical latitudes

A review of microscopic cell imaging and neural network recognition for synergistic cyanobacteria identification and enumeration

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