Microcystin-LR equivalents and their correlation with Anabaena spp. in the main reservoir of a hydraulic system of Central Mexico

Alillo-Sánchez, José L.; Gaytan-Herrera, Martha Leticia; Martínez-Almeida, Víctor M.; Ramı́rez-Garcı́a, Pedro

doi:10.5268/iw-4.3.573

Cited by 21 publications

(12 citation statements)

References 34 publications

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“…The 28‐d LC25 and LC50 values were below concentrations reported in aquatic systems throughout North America. In Mexico's Valle de Bravo Reservoir, microcystin‐LR concentrations were reported as ranging from 0.25 to 5.56 µg/L (Alillo‐Schanez et al ). In Vancouver Lake (WA, USA), concentrations varied in 2009 and 2010 from 12 to 15 µg/L, well above the calculated 28‐d LC50 value of 6.1 µg/L reported in the present study (Table ; Lee et al ).…”

Section: Resultsmentioning

confidence: 99%

Effect of Microcystis aeruginosa–Associated Microcystin-LR on the Survival of 2 Life Stages of Freshwater Mussel (Lampsilis siliquoidea)

Gene

Shahmohamadloo

Ortiz

et al. 2019

Environmental Toxicology and Chemistry

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Microcystin‐LR is a toxin commonly produced by the cyanobacterium Microcystis aeruginosa. It is present in harmful algal blooms and is a concern for both human and environmental health in Canadian freshwater systems. Previous studies have investigated the toxicity of microcystin‐LR to other organisms such as fish; however, it is important to assess its toxicity to native freshwater mussels (family Unionidae), which are considered imperiled. The present study examined the toxicity of microcystin‐LR to fatmucket mussels (Lampsilis siliquoidea) at 2 different life stages. Juvenile mussels were exposed to microcystin‐LR in a 28‐d chronic test, and glochidia underwent a 72‐h acute toxicity test. There was no significant relationship between glochidia viability and microcystin‐LR concentration. The median lethal concentration (LC50) value for juvenile mussels after 28 d of exposure was 2.1 µg/L. To determine the environmental relevance of the observed toxicity, an environmental exposure distribution was created using Canadian and Canadian–US Great Lakes microcystin measurements. The 28‐d LC50 value (2.1 µg/L) was greater than those values that occurred in the environment 95% of the time; however, the LC10 (0.45 µg/L) and LC25 (0.97 μg/L) values were not greater than the measured microcystin environmental values. This finding indicates that microcystins may exert toxic effects on juvenile mussels at environmentally relevant concentrations. Further investigation should be considered in terms of prolonged exposure to persistent microcystin‐LR, and toxicity to sensitive species at different life stages. Environ Toxicol Chem 2019;38:2137–2144. © 2019 SETAC.

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Section: Resultsmentioning

confidence: 99%

Effect of Microcystis aeruginosa–Associated Microcystin-LR on the Survival of 2 Life Stages of Freshwater Mussel (Lampsilis siliquoidea)

Gene

Shahmohamadloo

Ortiz

et al. 2019

Environmental Toxicology and Chemistry

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“…In this study we found that P. patulus was tolerant to the crude cyanotoxin extracts, reproducing from the first day in all treatments, obtaining thus positive values of population increase, unlike C. cornuta, which showed a low fecundity in the presence of cyanotoxins. Thus, rotifers are sufficiently resistant to cyanotoxins which partially explains their occurrence in water bodies with cyanobacterial blooms (Ramírez- García et al 2002;Alillo-Sánchez et al 2014). They are also sensitive enough to be used in rapid bioassays with crude extracts.…”

Section: Discussionmentioning

confidence: 98%

“…Even at an altitude of 1830 msl, blooms of Microcystis and Anabaena are found and these have recently been shown to be toxic with a wide range (*0 to 78 lg L -1 ) of microcystins in thin the reservoir over one year (Alillo-Sánchez et al 2014). Therefore it is necessary to evaluate the toxicity of cyanobacterial blooms.…”

Section: Introductionmentioning

confidence: 98%

Effect of crude extracts of Dolichospermum planctonicum on the demography of Plationus patulus (Rotifera) and Ceriodaphnia cornuta (Cladocera)

2014

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In this study we evaluated the toxicological effects of crude extracts of Dolichospermum planctonicum on Plationus patulus (Rotifera) and Ceriodaphnia cornuta (Cladocera). The active compound from the laboratory-cultured cyanobacteria was extracted by lyophilizing it at -70 °C for 48 h, after which the sample was thawed. The cycle was repeated five times, and between each cycle the cells were sonicated to lyse them. Using the extract of Anabaena, experiments of population growth and life table demography of the two zooplankton species were compared in media with and without (controls) the cyanotoxins. In both experiments two toxic concentrations diluted in US EPA medium were used, one in a 5:15 proportion, and the other in a 2.5:17.5. We found that the rotifers were more resistant to the toxicants than the cladocerans. Their population growth rates ranged from 0.11 d(-1) in controls to 0.08 d(-1) in the presence of the crude extracts for P. patulus and from 0.18 in controls to -0.27 in the presence of the crude extracts for C. cornuta. The crude extract also had a significant negative impact on the demographic parameters, adversely affecting reproduction more than survival. The data have been discussed with emphasis on the importance of further research using cyanobacterial crude extracts.

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“…When it is required, water can be pumped back to VB from the reservoirs on the western part of the Cutzamala System (see [29] for details). Like many other reservoirs in Mexico, Valle de Bravo (VB) shows a detriment in water quality mainly due to its eutrophication since 1992 [35] and health risks due to the presence of cyanotoxins like microcystin and anatoxin-a [31,[36][37][38]. For these reasons, information on nutrients (particularly N and P cycling) in this system has become a priority in recent years.…”

Section: Study Area: Valle De Bravomentioning

confidence: 99%

Nitrogen and Phosphorous Retention in Tropical Eutrophic Reservoirs with Water Level Fluctuations: A Case Study Using Mass Balances on a Long-Term Series

Barjau-Aguilar

Merino–Ibarra

Ramírez-Zierold³

et al. 2022

Water

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Nitrogen and phosphorous loading drives eutrophication of aquatic systems. Lakes and reservoirs are often effective N and P sinks, but the variability of their biogeochemical dynamics is still poorly documented, particularly in tropical systems. To contribute to the extending of information on tropical reservoirs and to increase the insight on the factors affecting N and P cycling in aquatic ecosystems, we here report on a long-term N and P mass balance (2003–2018) in Valle de Bravo, Mexico, which showed that this tropical eutrophic reservoir lake acts as a net sink of N (−41.7 g N m−2 y−1) and P (−2.7 g P m−2 y−1), mainly occurring through net sedimentation, equivalent to 181% and 68% of their respective loading (23.0 g N m−2 y−1 and 4.2 g P m−2 y−1). The N mass balance also showed that the Valle de Bravo reservoir has a high net N atmospheric influx (31.6 g N m−2 y−1), which was 1.3 times the external load and likely dominated by N2 fixation. P flux was driven mainly by external load, while in the case of N, net fixation also contributed. During a period of high water level fluctuations, the net N atmospheric flux decreased by 50% compared to high level years. Our results outlining water regulation can be used as a useful management tool of water bodies, by decreasing anoxic conditions and net atmospheric fluxes, either through decreasing nitrogen fixation and/or promoting denitrification and other microbial processes that alleviate the N load. These findings also sustain the usefulness of long-term mass balances to assess biogeochemical dynamics and its variability.

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Microcystin-LR equivalents and their correlation with Anabaena spp. in the main reservoir of a hydraulic system of Central Mexico

Cited by 21 publications

References 34 publications

Effect of Microcystis aeruginosa–Associated Microcystin-LR on the Survival of 2 Life Stages of Freshwater Mussel (Lampsilis siliquoidea)

Effect of Microcystis aeruginosa–Associated Microcystin-LR on the Survival of 2 Life Stages of Freshwater Mussel (Lampsilis siliquoidea)

Effect of crude extracts of Dolichospermum planctonicum on the demography of Plationus patulus (Rotifera) and Ceriodaphnia cornuta (Cladocera)

Nitrogen and Phosphorous Retention in Tropical Eutrophic Reservoirs with Water Level Fluctuations: A Case Study Using Mass Balances on a Long-Term Series

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