Single and combined effects of microcystin- and saxitoxin-producing cyanobacteria on the fitness and antioxidant defenses of cladocerans
Environmental Toxicology and Chemistry, ISSN: 1552-8618, Vol: 36, Issue: 10, Page: 2689-2697
2017
- 21Citations
- 47Captures
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Metrics Details
- Citations21
- Citation Indexes21
- CrossRef21
- 21
- Captures47
- Readers47
- 47
Article Description
Cyanobacteria produce different toxic compounds that affect animal life, among them hepatotoxins and neurotoxins. Because cyanobacteria are able to produce a variety of toxic compounds at the same time, organisms may be, generally, subjected to their combined action. In the present study, we demonstrate the single and combined effects on cladocerans of cyanobacteria that produce microcystins (hepatotoxins) and saxitoxins (neurotoxins). Animals were exposed (either singly or combined) to 2 strains of cyanobacteria isolated from the same environment (Funil Reservoir, Rio de Janeiro, Brazil). The effects on clearance rate, mobility, survivorship, fecundity, population increase rate (r), and the antioxidant enzymes glutathione-S-transferase (GST) and catalase (CAT) were measured. Cladoceran species showed a variety of responses to cyanobacterial exposures, going from no effect to impairment of swimming movement, lower survivorship, fecundity, and general fitness (r). Animals ingested cyanobacteria in all treatments, although at lower rates than good food (green algae). Antioxidant defense responses were in accordance with fitness responses, suggesting that oxidative stress may be related to such effects. The present study emphasizes the need for testing combined actions of different classes of toxins, because this is often, and most likely, the scenario in a more eutrophic world with global climatic changes. Environ Toxicol Chem 2017;36:2689–2697. © 2017 SETAC.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85030104236&origin=inward; http://dx.doi.org/10.1002/etc.3819; http://www.ncbi.nlm.nih.gov/pubmed/28409869; https://academic.oup.com/etc/article/36/10/2689/7740254; https://dx.doi.org/10.1002/etc.3819; https://setac.onlinelibrary.wiley.com/doi/10.1002/etc.3819
Oxford University Press (OUP)
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