<i>Anabaena flos-aquae</i>

Agnihotri, Vijai K.

doi:10.1080/10643389.2013.803797

Cited by 19 publications

(9 citation statements)

References 235 publications

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“…During this time, the photosynthetic activity of Microcystis is inhibited by low temperatures due to limitation of thylakoid membrane fluidity; however, the photosynthetic activity of Anabaena is not affected by chill stress because membrane fluidity can be maintained at normal levels by the upregulation of desaturase (indicated by ratio of C = C) when exposed to low-temperature stress (Wada et al 1994). Furthermore, the data show that there is a rapid decline of nitrogen in lake water in the spring (Deng et al 2007;Jia et al 2011), and this Nlimitation can promote the competitive advantage of Anabaena in the phytoplankton community due to of the ability to fix nitrogen (Agnihotri 2014). The second stage is the time between late spring and early summer.…”

Section: Discussionmentioning

confidence: 86%

Photosynthetic characteristics and inferred changes in thylakoid membrane fluidity determine bloom succession between Anabaena and Microcystis in eutrophic lakes

Wang

Cao

et al. 2016

J Appl Phycol

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Anabaena and Microcystis are common dominant cyanobacterial genera and frequently form blooms in large shallow eutrophic lakes in China. There is usually a quick succession between these two cyanobacterial blooms in early summer; however, there is currently no solid evidence based on photosynthesis and population competition to explain this phenomenon. This study compared the photosynthetic parameters and the indirectly measured thylakoid membrane fluidity characteristics between Anabaena and Microcystis. The results showed that the growth rate, the maximum photochemical efficiency of PSII (F v /F m ), and the maximum relative electron transport rate (rETR max ) of Microcystis cultured at 25°C were significantly lower than those from cells grown at 15°C, indirectly suggesting a marked limitation of thylakoid membrane fluidity at low temperatures. Chlorophyll fluorescence dynamics also indicated inhibition of NPQ formation and membrane fluidity when Microcystis was cultured at low temperatures; however, this inhibition was not significant for Anabaena. Fourier transition infrared (FT-IR) spectrometry indicated that the thylakoid membrane of Anabaena can maintain homeostasis fluidity through the upregulation of unsaturated fatty acids when exposed to chilling stress. Increasing the temperature significantly promoted the growth rate of Microcystis, while it had little effect on Anabaena. Moreover, photoinhibition of Anabaena was more easily induced by high light, thus accelerating the bloom succession from Anabaena to Microcystis during warm seasons. An activation-energy model was used to deduce that the threshold temperature of bloom succession was 15.4°C, which would increase to 16.2°C and decrease to 14.9°C under conditions of N-limitation and P-limitation.

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Section: Discussionmentioning

confidence: 86%

Photosynthetic characteristics and inferred changes in thylakoid membrane fluidity determine bloom succession between Anabaena and Microcystis in eutrophic lakes

Wang

Cao

et al. 2016

J Appl Phycol

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“…Shallow, non-stratifying lakes are especially vulnerable to excessive nutrient levels and the dominance of harmful cyanobacteria within phytoplankton communities [ 5 , 6 ]. Many of the cyanobacterial genera that bloom under these conditions, including Aphanizomenon , Dolichospermum (Anabaena ), Cylindrospermopsis , Planktothrix , and Microcystis , can be comprised of strains that produce toxins that can impact the health of aquatic life and humans [ 7 – 9 ]. Many Microcystis spp., for instance, can produce the hepatotoxin microcystin [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Nitrogen limitation, toxin synthesis potential, and toxicity of cyanobacterial populations in Lake Okeechobee and the St. Lucie River Estuary, Florida, during the 2016 state of emergency event

et al. 2018

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Lake Okeechobee, FL, USA, has been subjected to intensifying cyanobacterial blooms that can spread to the adjacent St. Lucie River and Estuary via natural and anthropogenically-induced flooding events. In July 2016, a large, toxic cyanobacterial bloom occurred in Lake Okeechobee and throughout the St. Lucie River and Estuary, leading Florida to declare a state of emergency. This study reports on measurements and nutrient amendment experiments performed in this freshwater-estuarine ecosystem (salinity 0–25 PSU) during and after the bloom. In July, all sites along the bloom exhibited dissolved inorganic nitrogen-to-phosphorus ratios < 6, while Microcystis dominated (> 95%) phytoplankton inventories from the lake to the central part of the estuary. Chlorophyll a and microcystin concentrations peaked (100 and 34 μg L-1, respectively) within Lake Okeechobee and decreased eastwards. Metagenomic analyses indicated that genes associated with the production of microcystin (mcyE) and the algal neurotoxin saxitoxin (sxtA) originated from Microcystis and multiple diazotrophic genera, respectively. There were highly significant correlations between levels of total nitrogen, microcystin, and microcystin synthesis gene abundance across all surveyed sites (p < 0.001), suggesting high levels of nitrogen supported the production of microcystin during this event. Consistent with this, experiments performed with low salinity water from the St. Lucie River during the event indicated that algal biomass was nitrogen-limited. In the fall, densities of Microcystis and concentrations of microcystin were significantly lower, green algae co-dominated with cyanobacteria, and multiple algal groups displayed nitrogen-limitation. These results indicate that monitoring and regulatory strategies in Lake Okeechobee and the St. Lucie River and Estuary should consider managing loads of nitrogen to control future algal and microcystin-producing cyanobacterial blooms.

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“…In this study we used the PNEC for three representative organisms of the aquatic environment: The cyanobacterium Anabaena flos-aquae (blue green algae) [40], the microalga Raphidocelis subcapitata and the green alga Green Chlorophyta [41,42].…”

Section: Ecological Risk Assessment Of Antibiotics Detected In the En...mentioning

confidence: 99%

Investigation of the Correlation between the Use of Antibiotics in Aquaculture Systems and Their Detection in Aquatic Environments: A Case Study of the Nera River Aquafarms in Italy

et al. 2020

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Antimicrobial resistance (AMR) arises mostly because of the use and abuse of antibiotics in both the human and veterinary sectors. Furthermore, antibiotic residues can be discharged into the environment, promoting the spread of AMR as well as becoming a potential ecotoxicological risk. Aquaculture is one such source of environmental pollution. In the present work, we evaluated the correlation between antibiotic consumption in 11 selected aquafarms located along the Nera River, and the detection of their residues in surface water and sediment samples gathered monthly from the same stream. Antibiotic consumption was calculated using the ESVAC defined daily doses for animals (DDDvet) method, and a chemical analysis was conducted using a multiclass method. Therefore, the ecological risk of antibiotics being detected in surface waters was established based on the risk quotient (RQ). A strong positive correlation was identified between the concentrations detected in surface waters and the consumption of flumequine (r = 72%, p-value = 0.0085) and florfenicol (r = 83%, p-value = 0.0008). The RQ, however, was low for all the detected antibiotics in surface waters. Therefore, we proved that the antibiotics used in aquaculture can reach the near aquatic environment, but, in this work, they did not represent a toxicological risk to the surrounding ecosystem.

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Anabaena flos-aquae

Cited by 19 publications

References 235 publications

Photosynthetic characteristics and inferred changes in thylakoid membrane fluidity determine bloom succession between Anabaena and Microcystis in eutrophic lakes

Photosynthetic characteristics and inferred changes in thylakoid membrane fluidity determine bloom succession between Anabaena and Microcystis in eutrophic lakes

Nitrogen limitation, toxin synthesis potential, and toxicity of cyanobacterial populations in Lake Okeechobee and the St. Lucie River Estuary, Florida, during the 2016 state of emergency event

Investigation of the Correlation between the Use of Antibiotics in Aquaculture Systems and Their Detection in Aquatic Environments: A Case Study of the Nera River Aquafarms in Italy

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