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Nitrogen availability increases the toxin quota of a harmful cyanobacterium, Microcystis aeruginosa
Author(s):
Geoffrey P. Horst
,
Orlando Sarnelle
,
Jeffrey D. White
,
Stephen K. Hamilton
,
RajReni B. Kaul
,
Julianne D. Bressie
Publication date
Created:
May 2014
Publication date
(Print):
May 2014
Journal:
Water Research
Publisher:
Elsevier BV
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There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.
Abstract
An important objective in understanding harmful phytoplankton blooms is determining how environmental factors influence the toxicity of bloom-forming species. We examined how nutrients and grazers (dreissenid mussels) affect the production of microcystin (a liver toxin) by the cyanobacterium Microcystis aeruginosa, via a combination of field and laboratory experiments, and field observations in Lake Erie. The field experiment revealed no effect of mussel density on microcystin quota (particulate microcystin per unit Microcystis biomass). In contrast, in both field and laboratory experiments, nitrogen-limited conditions led to substantially reduced microcystin quota relative to phosphorus-limited or nutrient-saturated conditions. In the field experiment, microcystin per unit of mcyB gene was strongly reduced under nitrogen-limited conditions, indicating a phenotypic response. Results from a seasonal survey in the western basin of Lake Erie revealed a similar negative influence of nitrogen limitation (as indexed by nitrate concentration) on microcystin quota. Our results are consistent with stoichiometric considerations in that the cell quota of a nitrogen-rich secondary metabolite, microcystin, was reduced disproportionately under nitrogen limitation. Copyright © 2014 Elsevier Ltd. All rights reserved.
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Journal
Title:
Water Research
Abbreviated Title:
Water Research
Publisher:
Elsevier BV
ISSN (Print):
00431354
Publication date Created:
May 2014
Publication date (Print):
May 2014
Volume
: 54
Pages
: 188-198
Article
DOI:
10.1016/j.watres.2014.01.063
PubMed ID:
24568788
SO-VID:
ec7e5191-4710-42ba-adde-fd1365bcdd34
Copyright ©
© 2014
License:
https://www.elsevier.com/tdm/userlicense/1.0/
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