Appearance and establishment of diazotrophic cyanobacteria in Lake Kinneret, Israel

Hadas, Ora; Pinkas, R.; Malinsky-Rushansky, Nehama; Nishri, A.; Kaplan, Aaron; Rimmer, Alon; Sukenik, Assaf

doi:10.1111/j.1365-2427.2012.02792.x

Cited by 37 publications

(26 citation statements)

References 55 publications

(97 reference statements)

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“…The reason that Nostocales species appear to be dominating the invasion into freshwater oligotrophic lakes as reported in the literature (Hadas et al ., ; Sinha et al ., ; Sukenik et al ., ) may result from the fact that these bacteria are more skilled to cope with increasing CO 2 availability and increased intracellular carbon levels by increasing their nitrogen levels through in‐house dinitrogen fixation. Non‐nitrogen‐fixing organisms would be unable to obtain enough inorganic nitrogen from internal nitrogen cycling within the sediment to maintain a dense, toxin or nontoxin‐producing bloom (Sukenik et al ., ).…”

Section: Hepatotoxin Production Under Changing Climatic Conditions Anmentioning

confidence: 99%

Climate change and regulation of hepatotoxin production in Cyanobacteria

Gehringer

Wannicke

2014

FEMS Microbiol Ecol

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Harmful, bloom-forming cyanobacteria (CyanoHABs) are occurring with increasing regularity in freshwater and marine ecosystems. The most commonly occurring cyanobacterial toxins are the hepatotoxic microcystin and nodularin. These cyclic hepta- and pentapeptides are synthesised nonribosomally by the gene products of the toxin gene clusters mcy and nda, respectively. Understanding of the regulation of hepatotoxin production is incomplete, although there is strong evidence supporting the roles of iron, light, higher nitrate availability and inorganic carbon in modulating microcystin levels. The majority of these studies have focused on the unicellular freshwater, microcystin-producing strain of Microcystis aeruginosa, with little attention being paid to terrestrial or marine toxin producers. This review intends to investigate the regulation of microcystin and nodularin production in unicellular and filamentous diazotrophic cyanobacteria against the background of changing climate conditions. Special focus is given to diazotrophic filamentous cyanobacteria, for example Nodularia spumigena, capable of regulating their nitrogen levels by actively fixing dinitrogen. By combining data from significant studies, an overall scheme of the regulation of toxin production is presented, focussing specifically on nodularin production in diazotrophs against the background of increasing carbon dioxide concentrations and temperatures envisaged under current climate change models. Furthermore, the risk of sustaining and spreading CyanoHABs in the future ocean is evaluated.

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Section: Hepatotoxin Production Under Changing Climatic Conditions Anmentioning

confidence: 99%

Climate change and regulation of hepatotoxin production in Cyanobacteria

Gehringer

Wannicke

2014

FEMS Microbiol Ecol

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“…Since the main source of P in Lake Kinneret during the summer is through the exchange with sediments, it is not clear what caused the large difference between two consecutive years with respect to P availability. In an earlier study we raised the possibility that the invasion of the diazotrophic Nostocals Aphanizomenon and C. raciborskii to Lake Kinneret since 1994 may be attributed to local meteorological changes (Hadas et al ., 2012). We compared specific abiotic and biological parameters to examine whether they could contribute to the marked differences between the Aphanizomenon populations and gene expressions therein in the springs of 2009 and 2010 (Figs 4 and 5).…”

Section: Resultsmentioning

confidence: 99%

“…Recent studies (Hadas et al ., 2012; Sukenik et al ., 2012) suggested that the invasion of filamentous cyanobacteria such as Aphanizomenon and Cylindrospermopsis raciborskii to Lake Kinneret was supported by changes in regional meteorological conditions. An earlier study (Hadas et al ., 2002) showed that the abiotic parameters in Lake Kinneret during the first massive Aphanizomenon bloom in 1994 closely matched the optimal conditions for its growth under controlled laboratory conditions and could explain its development during that year.…”

Section: Introductionmentioning

confidence: 99%

Multiannual variations in phytoplankton populations: what distinguished the blooms of Aphanizomenon ovalisporum in Lake Kinneret in 2010 from 2009?

Bar-Yosef

Murik

Sukenik

et al. 2012

Environ Microbiol Rep

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The reasons for large multiannual fluctuations in phytoplankton biomass and composition in freshwater lakes are complex and involve many biotic and abiotic parameters. Here we studied the 2009 and 2010 summer-autumn blooms of the toxic, cylindrospermopsin producer, Aphanizomenon ovalisporum (hereafter Aphanizomenon) in Lake Kinneret (Sea of Galilee), Israel. During the summer the total dissolved phosphate concentration in the lake is very low, close to the detection level, limiting the development of phytoplankton. Earlier we showed that Aphanizomenon blooms are associated with a large rise in alkaline phosphatase (Apase) activity in the water body and that cylindrospermopsin produced by Aphanizomenon induces the PHO regulon, including secretion of Apase, in other alga thereby improving its own phosphate supply. Aphanizomenon transcripts of PHO and AOA (involved in cylindrospermopsin biosynthesis) genes in Lake Kinneret appeared much earlier in 2010 than in 2009 suggesting that the phytoplankton became phosphate-limited already at the beginning of its summer bloom in 2010 but much later in 2009. Water inflow and lake water temperatures were significantly higher in 2010 but the incoming nutrients were consumed by the much larger phytoplankton biomass early in 2010 before the beginning of the Aphanizomenon bloom. An analysis of abiotic and biological parameters provides an explanation for the very different development of Aphanizomenon populations during 2009 and 2010.

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“…Slim et al [ 29 ] revealed that changes in climate regime, increase in air temperature and decrease in precipitation between 2000 and 2010 have altered Karaoun Reservoir biodiversity and resulted in low diversity dominated by Chrysosporum ovalisporum and Microcystis aeruginosa blooms. In Lake Kinneret, Hadas et al [ 37 ] proposed that the appearance and establishment of Chrysosporum ovalisporum since 1994 was linked to increased water temperature and limited nitrogen availability. Using a temperature based model, Mehnert et al [ 16 ] hypothesized a future northward expansion of Chrysosporum ovalisporum in Europe under the global warming scenario.…”

Section: Discussionmentioning

confidence: 99%

Dynamics of the Toxin Cylindrospermopsin and the Cyanobacterium Chrysosporum (Aphanizomenon) ovalisporum in a Mediterranean Eutrophic Reservoir

Fadel

Atoui

Lemaire

et al. 2014

Toxins

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Chrysosporum ovalisporum is a cylindrospermopsin toxin producing cyanobacterium that was reported in several lakes and reservoirs. Its growth dynamics and toxin distribution in field remain largely undocumented. Chrysosporum ovalisporum was reported in 2009 in Karaoun Reservoir, Lebanon. We investigated the factors controlling the occurrence of this cyanobacterium and vertical distribution of cylindrospermopsin in Karaoun Reservoir. We conducted bi-weekly sampling campaigns between May 2012 and August 2013. Results showed that Chrysosporum ovalisporum is an ecologically plastic species that was observed in all seasons. Unlike the high temperatures, above 26 °C, which is associated with blooms of Chrysosporum ovalisporum in Lakes Kinneret (Israel), Lisimachia and Trichonis (Greece) and Arcos Reservoir (Spain), Chrysosporum ovalisporum in Karaoun Reservoir bloomed in October 2012 at a water temperature of 22 °C during weak stratification. Cylindrospermopsin was detected in almost all water samples even when Chrysosporum ovalisporum was not detected. Chrysosporum ovalisporum biovolumes and cylindrospermopsin concentrations were not correlated (n = 31, r2 = −0.05). Cylindrospermopsin reached a maximum concentration of 1.7 µg L−1. The vertical profiles of toxin concentrations suggested its possible degradation or sedimentation resulting in its disappearance from the water column. The field growth conditions of Chrysosporum ovalisporum in this study revealed that it can bloom at the subsurface water temperature of 22 °C increasing the risk of its development and expansion in lakes located in temperate climate regions.

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Appearance and establishment of diazotrophic cyanobacteria in Lake Kinneret, Israel

Cited by 37 publications

References 55 publications

Climate change and regulation of hepatotoxin production in Cyanobacteria

Climate change and regulation of hepatotoxin production in Cyanobacteria

Multiannual variations in phytoplankton populations: what distinguished the blooms of Aphanizomenon ovalisporum in Lake Kinneret in 2010 from 2009?

Dynamics of the Toxin Cylindrospermopsin and the Cyanobacterium Chrysosporum (Aphanizomenon) ovalisporum in a Mediterranean Eutrophic Reservoir

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