Allelopathic potential of the dinoflagellate Alexandrium tamarense on marine microbial communities

Weißbach, Astrid; Tillmann, Urban; Legrand, Catherine

doi:10.1016/j.hal.2010.05.007

Cited by 37 publications

(27 citation statements)

References 61 publications

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“…In all treatments, compounds released by A. tamarense caused lytic activity towards cells of the target species, Rhodomonas salina. As has been observed in previous studies Weissbach et al 2010), the lytic effect is dose-dependent and thus can be quantified using a standardized bioassay, such as the Rhodomonas bioassay. The sensitivity of the target Rhodomonas salina from different cultures throughout different growth phases has been shown to be stable and reproducible (own unpublished results), which allows us to quantitatively compare not only different treatments tested simultaneously, but also cultures harvested at different time points corresponding to different growth phases.…”

Section: Discussionmentioning

confidence: 96%

Nutrient starvation effects on the allelochemical potency of Alexandrium tamarense (Dinophyceae)

Zhu

Tillmann

2012

Mar Biol

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Batch culture experiments were performed to investigate potential effects of nutrient starvation on the allelochemical potency of the toxic dinoflagellate Alexandrium tamarense. Triplicate cultures with reduced nitrate (-N) or phosphate (-P) seed were compared to nutrientreplete (?N?P) cultures. Total depletion of the dissolved inorganic limiting nutrient, reduced cell quotas, changed mass ratios of C/N/P and reduced cell yield clearly indicate that treatment cultures at stationary phase were starved by either N or P, whereas growth cessation of ?N?P cultures was probably due to carbon limitation and/or a direct effect of high pH. Pulsed addition of the limiting nutrient allowed -N and -P cultures to resume growth. Lytic activity of A. tamarense as quantified by a Rhodomonas bioassay was generally high (EC 50 around 100 cells mL -1 ) and was only slightly modulated by growth phase and/or nutrient starvation. Lytic activity per cell increased with time in both ?N?P and -P cultures but not -N cultures. P-starved stationary-phase cells were slightly more lytic than ?N?P cultures, but this difference may be due to increased cell size and/or accumulation of extracellular compounds. In conclusion, only slight changes but no general and major increase in lytic activity in response to nutrient starvation was observed.

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Section: Discussionmentioning

confidence: 96%

Nutrient starvation effects on the allelochemical potency of Alexandrium tamarense (Dinophyceae)

Zhu

Tillmann

2012

Mar Biol

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“…Several studies showed inhibitory impacts of allelochemicals produced by diatoms, raphidophytes and dinoflagellates towards certain bacterial strains (Ribalet et al, 2008;van Rijssel et al, 2008). In contrast, experiments with mixed communities showed higher bacterial abundances in the presence of allelochemicals (Uronen et al, 2007;Weissbach et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Impact of Alexandrium tamarense allelochemicals on DOM dynamics in an estuarine microbial community

et al. 2012

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“…There are also few reports about the possibility of producing such compounds by green algae and diatoms (Subba Rao & Smith 1995;Chiang et al 2004). In addition, it is believed that allelopathy may be one of the factors affecting the structure of phytoplankton (Legrand et al 2003) and the formation of massive blooms of cyanobacteria and algae in many freshwater, brackish and marine water bodies (Smayda 1997;Weissbach et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Allelopathic Effects of Cyanobacterial Filtrates on Baltic Diatom

Śliwińska¹,

Latała²

2012

Contemporary Trends in Geoscience

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Abstract. Allelopathy may be one of the factors affecting the formation of massive and harmful algal blooms in aquatic environments. Recent studies indicate that blooms of cyanobacteria in the Baltic Sea has grown significantly in last decades, so it is important to determine the allelopathic interactions between the dominant species of cyanobacteria and microalgae. In this work we investigated the influence of allelopathic compounds on the growth of Skeletonema marinoi by addition of cell-free filtrate of the Baltic cyanobacterium Nodularia spumigena cultures grown under different temperature (15-25ºC). Additionally the effects of filtrates of both an exponential and a stationary growing culture of N. spumigena were tested on diatom. These studies indicate that high temperature affected the donor species by increasing its production of allelochemicals. The highest drop of growth of analyzed diatom were observed after the addition of cell-free filtrate obtained from N. spumigena grown at 25ºC and constituted 70% of their control. N. spumigena was only allelopathic in exponential growth phase, whereas the cyanobacteria filtrate from stationary phase have any effect on S. marinoi. These findings suggest that N. spumigena may reveal allelopathic activity and that the production of allelopathic substances is influenced by the temperature and growth phase of cyanobacteria.

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Allelopathic potential of the dinoflagellate Alexandrium tamarense on marine microbial communities

Cited by 37 publications

References 61 publications

Nutrient starvation effects on the allelochemical potency of Alexandrium tamarense (Dinophyceae)

Nutrient starvation effects on the allelochemical potency of Alexandrium tamarense (Dinophyceae)

Impact of Alexandrium tamarense allelochemicals on DOM dynamics in an estuarine microbial community

Allelopathic Effects of Cyanobacterial Filtrates on Baltic Diatom

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