Effect of irradiance, temperature and salinity on growth and toxin production by Nodularia spumigena

Hobson, P.; Fallowfield, H.J.
February 2003
Hydrobiologia;Feb2003, Vol. 493 Issue 1-3, p7
Academic Journal
The object of this work was to determine, using a full-factorial experiment, the influence of temperature, irradiance and salinity on growth and hepatotoxin production by Nodularia spumigena, isolated from Lake Alexandrina in the south-east of South Australia. Higher levels of biomass (determined as particulate organic carbon, POC), toxin production and intracellular toxin concentration per mg POC were produced under light limited conditions (30 μmol m-2 s-1) and at salinities equal to or greater than those experienced in Lake Alexandrina. Both highest biomass and total toxin production rates were recorded at temperatures equal to or greater than those of the lake (20 and 30 °C). The temperature at which maximum biomass and toxin production was recorded decreased from 30 °C for cultures grown at 30 μmol m-2 s-1 to 20 °C when grown at 80 μmol m-2 s-1. In contrast, intracellular toxin per mg POC was highest at the lowest growth temperature, 10 °C, at both 30 and 80 μmol m-2 s-1. It appears that the optimum temperature for biosynthetic pathways used in the production of toxin is lower than the optimum temperature for those pathways associated with growth. Intracellular toxin levels were higher in cells cultured at 10 °C/30 μmol m-2 s-1 whereas the majority of the toxin was extracellular in cells grown at 30 °C/30 μmol m-2 s-1. This implies that the highest concentration of toxin in lake water would occur under high temperature and high irradiance conditions. Individual environmental parameters of salinity, irradiance and temperature were all shown to influence growth and toxin production. Notwithstanding, the overall influence of these three parameters on toxin production was mediated through their effect upon growth rate.


Related Articles

  • Curse of the blue-green lake monster. Ford, Ray // Cottage Life West;Summer2015, Vol. 24 Issue 4, p88 

    The article focuses on the health hazards posed by blue-green algae blooms, scientifically called cyanobacteria that are commonly found around lakes in the Prairie Provinces or Saskatchewan, Alberta, and British Columbia.

  • Physiological Studies on Tilapia Fish (Oreochromis niloticus) as Influenced by the Cyanobacterial Toxins Microcystin. Al-Kahtani, M. A.; Fathi, A. A. // Journal of Biological Sciences;2008, Vol. 8 Issue 7, p1226 

    The effects of microcystin produced by the toxic cyanobacterial strata Microcystis aeruginosa on bioaccumulation and antioxidant enzymes (superoxide dismutase and catalase) of tilapia fish (collected from Al-Khadoud spring, Al-Hasa, Saudi Arabia) were investigated. The results showed that...

  • Sensitivity Analysis of a Cyanobacterial Growth and Movement Model under Two Different Flow Regimes. Guven, Basak; Howard, Alan // Environmental Modeling & Assessment;Dec2011, Vol. 16 Issue 6, p577 

    Bloom-forming and toxin-producing cyanobacteria remain a persistent nuisance across the world. Modelling cyanobacterial behaviour in freshwaters is an important tool for understanding their population dynamics and predicting the location and timing of the bloom events in lakes, reservoirs and...

  • Methods to detect cyanobacteria and their toxins in the environment. Moreira, Cristiana; Ramos, Vitor; Azevedo, Joana; Vasconcelos, Vitor // Applied Microbiology & Biotechnology;Oct2014, Vol. 98 Issue 19, p8073 

    Cyanobacteria blooms are since early times a cause for environmental concern because of their negative impact through the release of odors, water discoloration, and more dangerously through the release of toxic compounds (i.e. the cyanotoxins) that can affect both human and animal welfare....

  • Cyanobacterial Blooms and their Toxicity in Vojvodina Lakes, Serbia. Svirčev, Z.; Simeunović, J.; Subakov-Simić, G.; Krstić, S.; Pantelić, D.; Dulić, T. // International Journal of Environmental Research;Summer2013, Vol. 7 Issue 3, p845 

    The presence of cyanobacteria (blue-green algae) is a significant indicator of water quality, having in mind that several genera have the quality of producing cyanotoxins, which are harmful to animals, plants and humans. Seven lakes in Vojvodina (Republic of Serbia) were examined in May and...

  • How to mitigate cyanobacterial blooms and cyanotoxin production in eutrophic water reservoirs? Pawlik-Skowronska, Barbara; Toporowska, Magdalena // Hydrobiologia;Sep2016, Vol. 778 Issue 1, p45 

    Cyanobacterial blooms and cyanotoxin production were studied for 2 years in four hydrologically modified lakes with nutrient-rich waters. We hypothesized that frequency of flushing may considerably influence cyanobacterial blooms. Abundance, biomass and diversity of cyanobacteria as well as...

  • Cyanobacterial blooms in kaliski region water reservoirs and water quality parameters / Zakwity sinicowe w zbiornikach okolic Kalisza a wskaźniki jakoÅ›ci wody. Szczukocki, Dominik; Dałkowski, Radosław; Krawczyk, Barbara; Juszczak, Renata; Olejniczak, Barbara; Andrijewski, Grzegorz; Kubisiak-Banaszkiewicz, Luiza // Archives of Environmental Protection;Mar2015, Vol. 41 Issue 1, p15 

    Cyanobacterial blooms occur frequently in artificial lakes, especially in water reservoirs with small retention exposition to anthropopressure. The abundant occurrence of cyanobacteria is accompanied by danger of oxygen imbalance in the aquatic environment and the secretion of toxins that are...

  • Assessing the potential health risk of cyanobacteria and cyanotoxins in Lake Naivasha, Kenya. Raffoul, M. H.; Enanga, E. M.; E Senar, O.; Creed, I. F.; Trick, C. G. // Hydrobiologia;Feb2020, Vol. 847 Issue 4, p1041 

    This study discerned the causes of cyanobacteria blooms in Lake Naivasha (Kenya). We hypothesized that phytoplankton and cyanobacteria biomass respond to hydrologic cycles, peaking during the wet season, and that microcystin (MC) concentrations are highest following the bloom collapse....

  • Effects of increases in salinity on phytoplankton in the Broadwater of the Myall Lakes, NSW, Australia. Redden, Anna; Rukminasari, Nita // Hydrobiologia;Jul2008, Vol. 608 Issue 1, p87 

    The Broadwater of the Myall Lakes system is highly susceptible to cyanobacterial bloom formation after heavy rain events. During prolonged low flow periods, saline intrusion from the lower Myall River increases salinity levels and effectively controls some bloom forming algal taxa. To assess the...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics