A comparison of the sensitivities of Daphnia magna and Daphnia pulex to six different cyanobacteria

Asselman, Jana; Hochmuth, Jennifer D.; Schamphelaere, Karel A.C. De

doi:10.1016/j.hal.2014.06.008

Cited by 22 publications

(17 citation statements)

References 37 publications

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“…This is further supported by the strong negative correlation between the percentage of M. aeruginosa and Cu EC50s ( Figure 4B). It is also in line with our previous reports, in which we showed that the adverse effects of M. aeruginosa can be attributed to more than just starvation-like effects in D. magna [31,52].…”

Section: Effects Of Cu and M Aeruginosa Mixture To D Magnasupporting

confidence: 93%

Temperature and food concentration have limited influence on the mixture toxicity of copper and Microcystis aeruginosa to Daphnia magna

Hochmuth

Janssen

Schamphelaere

2016

Enviro Toxic and Chemistry

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Standard ecotoxicity tests are conducted under constant and favorable experimental conditions. In natural communities, however, the toxicity of chemicals may be influenced by abiotic and biotic environmental factors. Firstly, the authors examined the influence of temperature and total food concentration on the nature of the combined effects of copper (Cu) and the cyanobacterium Microcystis aeruginosa to Daphnia magna (i.e., whether the combined effects deviated from noninteraction). Secondly, the authors investigated the relative influence of the percentage of M. aeruginosa in the diet, temperature, and total food concentration on chronic Cu toxicity to D. magna. The nature of the combined effects between Cu and M. aeruginosa (i.e., synergism according to the independent action reference model and noninteraction according to concentration addition reference model) was not affected by temperature and total food concentration. In line with other studies, the concentration addition reference model gave rise to more protective predictions of mixture toxicity than the independent action reference model, thus confirming the former model's suitability as a conservative scenario for evaluating mixture toxicity of Cu and M. aeruginosa under the temperature and food concentrations tested. Further, the 21-d median effective concentration for Cu based on reproduction varied between 20 μg/L and 100 μg/L, and the results indicate that the percentage of M. aeruginosa explained 76% of the variance in the Cu median effective concentration for reproduction, whereas the effects of temperature and total food were limited (together explaining 11% of the variance). The present study suggests that environmental risk assessment of Cu should consider specific situations where harmful M. aeruginosa blooms can co-occur with elevated Cu exposure.

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Section: Effects Of Cu and M Aeruginosa Mixture To D Magnasupporting

confidence: 93%

Temperature and food concentration have limited influence on the mixture toxicity of copper and Microcystis aeruginosa to Daphnia magna

Hochmuth

Janssen

Schamphelaere

2016

Enviro Toxic and Chemistry

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“…of some strains and species of Daphnia decline substantially in the presence of microcystins [19][20][21], while other strains and species are much less susceptible [19,20,22,23]. Notably, microcystin synthesis probably predates the evolution of the Metazoa [24], suggesting that it evolved originally for purposes other than defence against herbivory; the same holds true for the toxin nodularin, produced by cyanobacteria in the genus Nodularia [24].…”

Section: Introductionmentioning

confidence: 99%

Toxins or medicines? Phytoplankton diets mediate host and parasite fitness in a freshwater system

et al. 2019

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Diets must satisfy the everyday metabolic requirements of organisms and can also serve as medicines to combat disease. Currently, the medicinal role of diets is much better understood in terrestrial than in aquatic ecosystems. This is surprising because phytoplankton species synthesize secondary metabolites with known antimicrobial properties. Here, we investigated the medicinal properties of phytoplankton (including toxin-producing cyanobacteria) against parasites of the dominant freshwater herbivore, Daphnia. We fed Daphnia dentifera on green algae and toxic cyanobacteria diets known to vary in their nutritional quality and toxin production, and an additional diet of Microcystis with added pure microcystin-LR. We then exposed Daphnia to fungal and bacterial parasites. Anabaena, Microcystis and Chlorella diets prevented infection of Daphnia by the fungal parasite Metschnikowia, while Nodularia toxins increased offspring production by infected hosts. In contrast to their medicinal effects against Metschnikowia, toxic phytoplankton generally decreased the fitness of Daphnia infected with the bacterial parasite, Pasteuria. We also measured the amount of toxin produced by phytoplankton over time. Concentrations of anatoxin-a produced by Anabaena increased in the presence of Metschnikowia, suggesting parasite-induced toxin production. Our research illustrates that phytoplankton can serve as toxins or medicines for their consumers, depending upon the identity of their parasites.

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“…Studies by Wilson et al (2006), Tillmanns et al (2008) and Asselman et al (2014) do not support the longstanding hypothesis of cyanobacterial toxins as a primary driver for cyanobacterial toxicity. Instead these studies suggest that nutritional deficiency may be the primary driver of adverse effects.…”

Section: Introductionmentioning

confidence: 69%

“…; Asselman et al . ). Fatty acids and sterols have been indicated as the primary nutrients lacking in cyanobacteria compared to other green algae (Von Elert et al .…”

Section: Resultsmentioning

confidence: 97%

“…Furthermore, this shared nutritional feature elicits a response similar to the differential response of Daphnia when exposed to diets of green algae with different nutritional properties due to differential phosphorous concentration in the growth medium of these algae. Previous studies have put forward the hypothesis of nutritional deficiency in diets supplemented with cyanobacteria to explain observed adverse effects during cyanobacterial exposure (Von Elert et al 2003;Brett et al 2006;Asselman et al 2014). Fatty acids and sterols have been indicated as the primary nutrients lacking in cyanobacteria compared to other green algae (Von Elert et al 2003;Tillmanns et al 2008).…”

Section: Functional Multistress Responses and Specific Cyanobacterialmentioning

confidence: 99%

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Conserved transcriptional responses to cyanobacterial stressors are mediated by alternate regulation of paralogous genes in Daphnia

et al. 2015

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Despite a significant increase in genomic data, our knowledge of gene functions and their transcriptional responses to environmental stimuli remains limited. Here, we use the model keystone species Daphnia pulex to study environmental responses of genes in the context of their gene family history to better understand the relationship between genome structure and gene function in response to environmental stimuli. Daphnia were exposed to five different treatments, each consisting of a diet supplemented with one of five cyanobacterial species, and a control treatment consisting of a diet of only green algae. Differential gene expression profiles of Daphnia exposed to each of these five cyanobacterial species showed that genes with known functions are more likely to be shared by different expression profiles, whereas genes specific to the lineage of Daphnia are more likely to be unique to a given expression profile. Furthermore, while only a small number of nonlineage-specific genes were conserved across treatment type, there was a high degree of overlap in expression profiles at the functional level. The conservation of functional responses across the different cyanobacterial treatments can be attributed to the treatment-specific expression of different paralogous genes within the same gene family. Comparison with available gene expression data in the literature suggests differences in nutritional composition in diets with cyanobacterial species compared to diets of green algae as a primary driver for cyanobacterial effects on Daphnia. We conclude that conserved functional responses in Daphnia across different cyanobacterial treatments are mediated through alternate regulation of paralogous gene families.

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A comparison of the sensitivities of Daphnia magna and Daphnia pulex to six different cyanobacteria

Cited by 22 publications

References 37 publications

Temperature and food concentration have limited influence on the mixture toxicity of copper and Microcystis aeruginosa to Daphnia magna

Temperature and food concentration have limited influence on the mixture toxicity of copper and Microcystis aeruginosa to Daphnia magna

Toxins or medicines? Phytoplankton diets mediate host and parasite fitness in a freshwater system

Conserved transcriptional responses to cyanobacterial stressors are mediated by alternate regulation of paralogous genes in Daphnia

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