Mechanisms of the inhibitory effect of the cyanobacterium Microcystis aeruginosa on Daphnia galeata's ingestion rate

Rohrlack, Thomas; Henning, Manfred; Kohl, Johannes‐Günter

doi:10.1093/plankt/21.8.1489

Cited by 71 publications

(54 citation statements)

References 25 publications

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“…Microcystin has been shown to be a strong factor in shaping zooplankton communities (21); however, the role of microcystin as a feeding deterrent is much less important (36). A number of other factors have been shown to overrule the poisoning effect of microcystin, such as the composition of the mucilage (35) or the size of the colonies. It is known from earlier studies that the size limit for large daphnids (the zooplankton organisms with the highest grazing rates) to feed efficiently on Microcystis sp.…”

Section: Vol 69 2003 Factors Affecting Microcystin Net Production 793mentioning

confidence: 99%

The Abundance of Microcystin-Producing Genotypes Correlates Positively with Colony Size inMicrocystissp. and Determines Its Microcystin Net Production in Lake Wannsee

Kurmayer

Christiansen

Chorus³

2003

Appl Environ Microbiol

206

166

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The working hypotheses tested on a natural population of Microcystis sp. in Lake Wannsee (Berlin, Germany) were that (i) the varying abundance of microcystin-producing genotypes versus non-microcystin-producing genotypes is a key factor for microcystin net production and (ii) the occurrence of a gene for microcystin net production is related to colony morphology, particularly colony size. To test these hypotheses, samples were fractionated by colony size with a sieving procedure during the summer of 2000. Each colony size class was analyzed for cell numbers, the proportion of microcystin-producing genotypes, and microcystin concentrations. The smallest size class of Microcystis colonies (<50 m) showed the lowest proportion of microcystinproducing genotypes, the highest proportion of non-microcystin-producing cells, and the lowest microcystin cell quotas (sum of microcystins RR, YR, LR, and WR). In contrast, the larger size classes of Microcystis colonies (>100 m) showed the highest proportion of microcystin-producing genotypes, the lowest proportion of non-microcystin-producing cells, and the highest microcystin cell quotas. The microcystin net production rate was nearly one to one positively related to the population growth rate for the larger colony size classes (>100 m); however, no relationship could be found for the smaller size classes. It was concluded that the variations found in microcystin net production between colony size classes are chiefly due to differences in genotype composition and that the microcystin net production in the lake is mainly influenced by the abundance of the larger (>100-m) microcystin-producing colonies.The freshwater cyanobacterium Microcystis frequently forms mass developments and surface scums in eutrophic lakes; the majority of these formations contain toxins-the hepatotoxic microcystins. The hazard posed to vertebrates, including humans, and potentially to other eucaryotic animals by these toxins necessitates assessments of their human health and environmental risk potential. Such assessments require not only rapid and reliable methods for analysis of ambient toxin concentrations but also, in particular, tools for understanding factors leading to hazardous levels of toxicity in natural populations and-ultimately-for predicting the development of toxin concentrations in water. An essential basis for these goals is a comprehensive understanding of the regulation of microcystin net production in nature.Microcystins are members of a peptide family which have the common structure cyclo, where X and Z are variable L amino acids, Adda is 3-amino-9-methoxy-2,6,8-trimethyl-10-phenyl-4,6-decadienoic acid, D-MeAsp is 3-methyl-aspartic acid, and Mdha is N-methyldehydroalanine (3). More than 70 structural variants of microcystins are known to date. Microcystins are synthesized by thiotemplate mechanisms like those for other nonribosomal peptides (e.g., antibiotics such as gramicidin and tyrocidin) produced by bacteria and fungi (25). The large gene cluster encoding peptide synthetases a...

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Section: Vol 69 2003 Factors Affecting Microcystin Net Production 793mentioning

confidence: 99%

The Abundance of Microcystin-Producing Genotypes Correlates Positively with Colony Size inMicrocystissp. and Determines Its Microcystin Net Production in Lake Wannsee

Kurmayer

Christiansen

Chorus³

2003

Appl Environ Microbiol

206

166

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“…However, the viewpoint of nutrient-deficient gives no explanation to some recent observations on the toxicity of MC-free strains (Rohrlack et al, 1999;Ferrão-Filho et al, 2000;Lürling, 2003). In field, MC-containing strains and MC-free strains usually coexist in the same lakes (Sivonen et al, 1990).…”

Section: Introductionmentioning

confidence: 96%

Development of tolerance against toxic Microcystis aeruginosa in three cladocerans and the ecological implications

Guo

Xie

2006

Environmental Pollution

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“…Several hypotheses have been proposed concerning the role of such metabolites at several trophic levels (for reviews, see Vasconcelos and Pereira, 2001;Gross, 2003;Wiegand and Pflugmacher, 2005;Babica et al, 2006;Leflaive and TenHage, 2007;Schatz et al, 2007). However, such a toxic activity is difficult to characterize because of (i) the presence of other molecules that may modify the effect of toxins (Rohrlack et al, 1999b;Buryskova et al, 2006), (ii) the adaptation of target organisms (Wilson and Hay, 2007) and (iii) the appearance of avoidance behaviour in some species of zooplankton (Kurmayer and Ju¨ttner, 1999). As summarized above, several characteristics of cyanobacteria may contribute to lower zooplankton grazing pressure on cyanobacteria.…”

Section: Introductionmentioning

confidence: 99%

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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Mechanisms of the inhibitory effect of the cyanobacterium Microcystis aeruginosa on Daphnia galeata's ingestion rate

Cited by 71 publications

References 25 publications

The Abundance of Microcystin-Producing Genotypes Correlates Positively with Colony Size inMicrocystissp. and Determines Its Microcystin Net Production in Lake Wannsee

The Abundance of Microcystin-Producing Genotypes Correlates Positively with Colony Size inMicrocystissp. and Determines Its Microcystin Net Production in Lake Wannsee

Development of tolerance against toxic Microcystis aeruginosa in three cladocerans and the ecological implications

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

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