Microcystin ecotypes in a perennial Planktothrix agardhii bloom

Yéprémian, Claude; Gugger, Muriel; Briand, Enora; Catherine, Arnaud; Berger, C.; Quiblier, Catherine; Bernard, Cécile

doi:10.1016/j.watres.2007.06.028

Cited by 59 publications

(62 citation statements)

References 38 publications

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“…3). A further fraction of unexplained variability was due to the control of cell quota by environmental and physiological factors, as well as changes in the proportion of toxic genotypes (Ye´pre´mian et al, 2007). Nevertheless, considering the strict link between MCs and BV Pr , these factors appeared of minor importance (see below).…”

Section: Discussionmentioning

confidence: 99%

“…Similarly, studies carried out on Planktothrix agardhii clearly demonstrated that strong differences in MC cell quota can be present also in single water bodies. Ye´pre´mian et al (2007) interpreted the weak relationship between the biomass of P. agardhii and the MC concentrations in a small eutrophic lake as mainly caused by seasonal changes in the proportion of MC producing strains, the physiological state of cells and MC chemotypes diversity.…”

Section: Discussionmentioning

confidence: 99%

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Strict coupling between the development ofPlanktothrix rubescensand microcystin content in two nearby lakes south of the Alps (lakes Garda and Ledro)

Salmaso

Adriano

Shams

et al. 2013

Ann. Limnol. - Int. J. Lim.

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-Cyanobacteria and their principal cyanotoxins were studied in the largest Italian lake (Lake Garda, 65 m a.s.l.) and in a near smaller reservoir (Lake Ledro, 652 m a.s.l.). The two lakes share a fraction of water due to a pipe pumping water from and into the lakes and the same dominant cyanobacterial species (Planktothrix rubescens). Despite the differences in the concentrations of cyanotoxins (mostly microcystins, MCs) and biovolumes of P. rubescens (BV Pr ) (over one order of magnitude), the Bayesian analyses linking these two variables showed striking similarities, suggesting the existence of similar toxic genotypes colonizing the two water bodies and a constitutive MC production. It was stressed that a greater sensitivity and reliability in the management strategies aimed at minimizing the risks due to cyanobacteria should also contemplate the use of specific lake-tailored models linking MCs and BV Pr .

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Strict coupling between the development ofPlanktothrix rubescensand microcystin content in two nearby lakes south of the Alps (lakes Garda and Ledro)

Salmaso

Adriano

Shams

et al. 2013

Ann. Limnol. - Int. J. Lim.

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“…Experiments were performed with two monoclonal and non-axenic strains of P. agardhii isolated from BNV, France (Ye´pre´mian et al, 2007) (Ye´pre´mian et al, 2007). The strains are hereafter referred as MC-strain and MCfree strain, respectively.…”

Section: Experimental Organismsmentioning

confidence: 99%

“…Each strain was cultured in four modified 2 L Duran bottles containing 1 L of Z8 medium (Kotai, 1972) and inoculated with 100 mL of an active culture. The bottles were placed in growth chambers at 20¡ 1 xC, and illuminated with cool white fluorescent tubes (Osram lumilux Plus Eco, L18W/21-840) with a 16 h light:8 h dark cycle, under 10¡ 2 mmoles photons.m x2 .s x1 (Ye´pre´mian et al, 2007). Cultures growth was monitored by measuring optical density at 436 and 750 nm every 2 days with a spectrophotometer (Foy, 1980).…”

Section: Experimental Organismsmentioning

confidence: 99%

“…These long-term effects are estimated by calculating demographic descriptors using matrix population models. To begin, we conducted a lifetable experiment to assess the effects of a MC-producing strain (PMC 75.02), a MC-free strain (PMC 87.02) of P. agardhii (Ye´pre´mian et al, 2007) and pure microcystin-RR (MC-RR) on D. magna population dynamics. Strains of P. agardhii were isolated from a bloom in a lake from Base Nautique de Viry (BNV), in Paris area (France).…”

Section: Introductionmentioning

confidence: 99%

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Effects of microcystin-producing and microcystin-free strains ofPlanktothrix agardhiion long-term population dynamics ofDaphnia magna

Hulot

Carmignac²,

Legendre³

et al. 2012

Ann. Limnol. - Int. J. Lim.

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-The effects of cyanobacterial toxins on herbivorous zooplankton depend on cyanobacterial strains, zooplankton species and environmental conditions. To explore the relationship between zooplankton and cyanobacteria, we investigated the effects of Planktothrix agardhii extracts on Daphnia magna population dynamics. We designed an experiment where individuals were grown in the presence of extracts of two P. agardhii strains. We monitored daily life-history parameters of D. magna individuals subjected to microcystin-RR (MC-RR), intracellular and extracellular extracts of a microcystin-producing strain (MC-strain, PMC 75.02) and a microcystin-free strain (MC-free strain, PMC 87.02) of P. agardhii. Measured life-history parameters of D. magna were used to build population dynamics models and compute expected population growth rate, replacement rate, generation time and proportion of adult and juveniles at demographic equilibrium. Results show that MC-RR tends to slow the life history (reduced growth rate and larger proportion of adults). In contrast, intracellular extracts of the two strains tend to accelerate the life history (increased growth rate, decreased generation time and lower proportion of adults). Extracellular extracts produce the same trends as the intracellular extracts but to a lesser extent. However, the MC-strain has stronger effects than the MC-free strain. Interestingly, extracellular extracts of the MC-free strain may have effects comparable to pure MC-RR. Moreover, in the presence of MC-RR and both cyanobacterial extracts, the daily fecundities present a cyclic pattern. These results suggest that MC-RR and unknown metabolites of cyanobacterial extracts have negative effects on D. magna reproduction processes such as those observed with endocrine-disruptive molecules.

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