Reduced forms of nitrogen are a driver of non-nitrogen-fixing harmful cyanobacterial blooms and toxicity in Lake Erie

Newell, Silvia E.; Davis, Timothy W.; Johengen, Thomas H.; Gossiaux, Duane C.; Burtner, Ashley M.; Palladino, Danna; McCarthy, Mark J.

doi:10.1016/j.hal.2018.11.003

Cited by 105 publications

(63 citation statements)

References 66 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Reduced N forms such as ammonium and urea can favor dinoflagellates and non‐nitrogen‐fixing cyanobacteria (e.g., Microcystis spp. ; Planktothrix agardhii ), whereas the dominant oxidized form, nitrate, can favor diatoms, green algae and some other taxa (Blomqvist, Pettersson, & Hyenstrand, ; Glibert et al, ; Newell et al, ). High nutrient loads of any form can promote production of organic matter, and the subsequent decomposition and release of regenerated ammonium from the sediments can support subsequent summer cyanobacterial HABs like Microcystis spp.…”

Section: Harmful Algal Bloomsmentioning

confidence: 99%

“…High nutrient loads of any form can promote production of organic matter, and the subsequent decomposition and release of regenerated ammonium from the sediments can support subsequent summer cyanobacterial HABs like Microcystis spp. that do not fix N (Newell et al, ). Similarly, lakes and estuaries impacted by wastewater treatment effluents or industrial sources high in ammonium may favor cyanobacteria over more beneficial types of phytoplankton, especially in warm summer months (Paerl & Otten, ).…”

Section: Harmful Algal Bloomsmentioning

confidence: 99%

See 1 more Smart Citation

Nutrients, eutrophication and harmful algal blooms along the freshwater to marine continuum

2019

View full text Add to dashboard Cite

Agricultural, urban and industrial activities have dramatically increased aquatic nitrogen and phosphorus pollution (eutrophication), threatening water quality and biotic integrity from headwater streams to coastal areas world-wide. Eutrophication creates multiple problems, including hypoxic "dead zones" that reduce fish and shellfish production; harmful algal blooms that create taste and odor problems and threaten the safety of drinking water and aquatic food supplies; stimulation of greenhouse gas releases; and degradation of cultural and social values of these waters. Conservative estimates of annual costs of eutrophication have indicated $1 billion losses for European coastal waters and $2.4 billion for lakes and streams in the United States. Scientists have debated whether phosphorus, nitrogen, or both need to be reduced to control eutrophication along the freshwater to marine continuum, but many management agencies worldwide are increasingly opting for dual control. The unidirectional flow of water and nutrients through streams, rivers, lakes, estuaries and ultimately coastal oceans adds additional complexity, as each of these ecosystems may be limited by different factors. Consequently, the reduction of just one nutrient upstream to control eutrophication can allow the export of other nutrients downstream where they may stimulate algal production. The technology exists for controlling eutrophication, but many challenges remain for understanding and managing this global environmental problem.

show abstract

Section: Harmful Algal Bloomsmentioning

confidence: 99%

Section: Harmful Algal Bloomsmentioning

confidence: 99%

Nutrients, eutrophication and harmful algal blooms along the freshwater to marine continuum

2019

View full text Add to dashboard Cite

show abstract

“…Field studies based on qPCR also indicate that MC-producing strains perform better under low N:P ratios [29,69,72]. In addition, recent studies [72][73][74] suggest that the nitrogen species, such as NO 3 :NH 3 ratios [72], might play a key role both as drivers of cyanobacterial blooms, and in the production of secondary metabolites such as microcystin.…”

Section: Discussionmentioning

confidence: 95%

High Diversity of Microcystin Chemotypes within a Summer Bloom of the Cyanobacterium Microcystis botrys

Johansson

Legrand

Björnerås

et al. 2019

Toxins

View full text Add to dashboard Cite

The fresh-water cyanobacterium Microcystis is known to form blooms world-wide, and is often responsible for the production of microcystins found in lake water. Microcystins are non-ribosomal peptides with toxic effects, e.g. on vertebrates, but their function remains largely unresolved. Moreover, not all strains produce microcystins, and many different microcystin variants have been described. Here we explored the diversity of microcystin variants within Microcystis botrys, a common bloom-former in Sweden. We isolated a total of 130 strains through the duration of a bloom in eutrophic Lake Vomb, and analyzed their microcystin profiles with tandem mass spectrometry (LC-MS/MS). We found that microcystin producing (28.5%) and non-producing (71.5%) M. botrys strains, co-existed throughout the bloom. However, microcystin producing strains were more prevalent towards the end of the sampling period. Overall, 26 unique M. botrys chemotypes were identified, and while some chemotypes re-occurred, others were found only once. The M. botrys chemotypes showed considerable variation both in terms of number of microcystin variants, as well as in what combinations the variants occurred. To our knowledge, this is the first report on microcystin chemotype variation and dynamics in M. botrys. In addition, our study verifies the co-existence of microcystin and non-microcystin producing strains, and we propose that environmental conditions may be implicated in determining their composition. Key Contribution:This study demonstrates that a single bloom of Microcystis botrys consists of strains with different microcystin chemotypes, each producing from zero up to 12 different microcystin variants. We established that microcystin and non-microcystin producing strains co-occur, and that the chemotype composition varies during the bloom.Toxins 2019, 11, 698 2 of 16 bloom-forming cyanobacteria, and that harmful blooms will increase both in frequency and duration, due to direct and indirect effects of changes in hydrological cycling, increased water temperatures, and nutrient loading [4][5][6][7][8][9].In addition to forming dense blooms which can deteriorate water quality per se, many cyanobacterial genera produce secondary metabolites with significant bioactivity and toxicity to aquatic organisms and humans [10][11][12][13][14]. In freshwaters, microcystins are among the most common cyanotoxins [7,15]. These inhibit the eukaryotic protein phosphatases 1 and 2a, and have hepatotoxic effects in vertebrates [10,16,17]. Drinking water from surface water supplies must therefore be checked for microcystin content, and may not be higher than 1 µg microcystin L −1 according to WHO regulation. Microcystins are cyclic heptapeptides (Figure 1) and are produced by several cyanobacteria including Microcystis, Planktothrix, and Anabaena (Dolichospermum) [14,18,19]. The common structure and biosynthetic pathway of microcystin synthesis in these genera have been described [20][21][22][23][24][25]. In Microcystis, the microcystin synthetase gene cluster co...

show abstract

“…y Microcystis sp. las cuales han sido asociadas a eutrofización en otros lagos alrededor del mundo (Binding et al 2019;Gomes et al 2013;Michalak et al 2013;Newell et al 2019;Wood et al 2005). Es evidente que la Laguna de Cajititlán se encuentra bajo un problema de eutrofización generado por las actividades antropogénicas realizadas alrededor de este ecosistema, principalmente el vertido de aguas residuales domésticas, agrícolas e industriales.…”

Section: Ensamblaje De Fitoplancton; Variación Temporalunclassified

“…En el país solo el 20% de las aguas residuales son tratadas (CONABIO Y SEMARNAT, 2009). El agua no tratada afecta los cuerpos de agua dulce con descargas de nutrientes, lo que favorece la aparición de los Florecimientos Algales Nocivos (FAN) que generan problemas como hipoxia y anoxia en la columna de agua (Glibert et al 2005;Michalak et al 2013;Newell et al 2019).…”

Section: Introductionunclassified

Ensamblaje Fitoplanctónico De La Laguna De Cajititlán, Jalisco Durante El Año 2015

Ocampo-Alvarez¹,

Lara-González²,

Choix-Ley³

et al. 2020

e-cucba

View full text Add to dashboard Cite

show abstract

Reduced forms of nitrogen are a driver of non-nitrogen-fixing harmful cyanobacterial blooms and toxicity in Lake Erie

Cited by 105 publications

References 66 publications

Nutrients, eutrophication and harmful algal blooms along the freshwater to marine continuum

Nutrients, eutrophication and harmful algal blooms along the freshwater to marine continuum

High Diversity of Microcystin Chemotypes within a Summer Bloom of the Cyanobacterium Microcystis botrys

Ensamblaje Fitoplanctónico De La Laguna De Cajititlán, Jalisco Durante El Año 2015

Contact Info

Product

Resources

About