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toxic algae

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Journal Article
Aquatic Ecosystem Health & Management (1999) 2 (4): 419–434.
Published: 01 January 1999
... in the sediments. The lack of benthos reduces the mixing of sediments and the flux of oxygen into sediments. Furthermore, these very reducing condi­ tions can encourage growth of toxin producing microbes such as Clostridium botulinum (Wobeser, 1997). The succession of toxic algae in lakes can include a stage where...
Journal Article
Aquatic Ecosystem Health & Management (2015) 18 (3): 334–341.
Published: 03 July 2015
... ). Many toxic algae also increase their toxin content under conditions of elevated N:P ratios (Granéli et al., 1998 ; Granéli and Johansson, 2003a , b ; Granéli and Flynn, 2006 ; Hardison et al., 2012 , 2013 ). Many toxins are rich in N as well as C compounds, and thus production of toxins rich in N...
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Journal Article
Aquatic Ecosystem Health & Management (2012) 15 (sup1): 64–72.
Published: 01 January 2012
... Arabian Gulf red tide toxic algae phytoplankton microphytobenthos marine mortality Microalgal blooms occur in Kuwait's waters year round. Seasonal non-harmful blooms are normal phenomena in Kuwait's waters and in the Gulf region (Al-Hassan et al., 1990 ; Al-Yamani et al., 2000 ; Subba Rao...
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Journal Article
Aquatic Ecosystem Health & Management (2011) 14 (2): 219–224.
Published: 01 April 2011
... of ∼40,000 mg m −3 had >200 μg l −1 of microcystins (Herbert and Kling data on file; SOL, 2011, in press; Kling et al., 2007 ). Copyright © AEHMS 2011 eutrophication cyanobacteria blooms non siliceous and siliceous microfossils toxic algae Lake Winnipeg (LW), Manitoba...
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Journal Article
Aquatic Ecosystem Health & Management (2008) 11 (1): 42–49.
Published: 10 March 2008
... since 1927 ( Lung'ayia et al., 2000 ). Reduction in water clarity has probably affected the hunting ability of Nile perch which is a visual hunter ( Ogutu-Ohwayo, 1990b ; Mkumbo, 2002 ). Nile tilapia can shift to filter feeding on algae and is able to select against toxic algae ( Robinson et al., 1995...
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Journal Article
Aquatic Ecosystem Health & Management (2005) 8 (4): 405–414.
Published: 01 October 2005
... on organisms sensitivity, in descending order: algae Pseudokirchneriella subcapitata > duckweed Lemna minor > cladoceran Daphnia magna . At the same time, leachates were assessed with a 2 litre freshwater/sediment microcosm. All species were impaired. Toxicity effects increased with leachate...
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Journal Article
Aquatic Ecosystem Health & Management (2000) 3 (4): 433–447.
Published: 01 January 2000
... of adverse effects of activities related to oil production, transportation and proces- sing in Brazil relies strongly on toxicity testing. The effects of crude oil and of oil-dispersant mixtures were analyzed on a Brazilian strain of the macro-alga Champia parvula (Maurat, 1996) and in tests with the mysid...
Journal Article
Aquatic Ecosystem Health & Management (2004) 7 (1): 137–146.
Published: 01 January 2004
... ( Torres and O'Flaherty, 1976 ). Toxicity tests with five species of the green algae Scenedesmus sp. yielded 3 h to 14 h growth rate EC 50 values of 21 to 300 μ g l − 1 ( Geyer et al., 1985 ). Atrazine toxicity was compared using eight individual algal species in microcosm and experimental pond tests...
Journal Article
Aquatic Ecosystem Health & Management (2015) 18 (3): 290–298.
Published: 03 July 2015
... of the molecular evidence for ballast water introduction of the toxic dinoflagellates Gymnodinium catenatum and the Alexandrium tamarensis complex to Australasia . Harmful Algae 6 , 465 – 485 . Buma , A. G. J. , van Hannen , E. J. , Roza , L. , Veldhuis , M. J. W. , Gieskes...
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Journal Article
Aquatic Ecosystem Health & Management (2001) 4 (4): 479–492.
Published: 01 December 2001
... monitored. Mortalities in bacterial populations and low chemical oxygen demand removal efficiencies were detected when absorbable organic halogens and pesticide concentrations were above 100 and 120 mg l -1 , respectively. Short-term bioassays (using bacteria, protozoa or algae) and enrichment toxicity...
Journal Article
Aquatic Ecosystem Health & Management (2015) 18 (2): 221–231.
Published: 03 April 2015
...-Pb provokes antagonistic effects: toxicity is lower in assays with combined Cd-Pb when compared to their individual effects. For As, Pawlik-Skowronska et al. (2004) found that accumulation and toxicity in algae was related to pH. In XLS algal growth stimulation was detected in UZ and TZ in August...
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Journal Article
Aquatic Ecosystem Health & Management (1998) 1 (3-4): 317–322.
Published: 01 January 1998
... (Ignacio Ramírez) compared with effluent from an oil refinery (18 de Marzo). In vitro AChE activity is suggested as a rapid test to identify water samples that are toxic or of poor quality and that should be subject to further chemical analysis and toxicity testing. A_quatic EcosY.stem Health & Management...
Journal Article
Aquatic Ecosystem Health & Management (2001) 4 (2): 151–163.
Published: 01 June 2001
... and dissolved (complex or colloidal) matter exists only by definition: the boundary has been set on the basis of existing filtration techniques (0.45 µm, 0.2 µm or similar). Dissolved organic matter originates from excretion and degradation products of planktonic, littoral and benthic algae, fungi, bacteria...
Journal Article
Aquatic Ecosystem Health & Management (2002) 5 (4): 443–449.
Published: 01 December 2002
...-LR concentration in phytoplankton of eutrophic lakes. Can. J. Fish. Aquat. Sci. 57, 1584 1593. Krishnamurthy, T., Carmichael, W. W., Sarver, E. W., 1986. Toxic peptides from freshwater cyanobacteri a (blue-green algae). I. Iso- lation, puriŽ cation and characterization of peptides from Micro- cystis...
Journal Article
Aquatic Ecosystem Health & Management (2009) 12 (4): 375–389.
Published: 30 November 2009
... , respectively. Endosulfan was much more toxic to the microalgae than 2, 4-D dimethylamine. Both pesticides reduced photosynthetic pigments and oxygen production rate of the microalgae. After 48 hours exposure to the pesticides, the microalgae were transferred to a pesticide-free medium to investigate the post...
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Journal Article
Aquatic Ecosystem Health & Management (2002) 5 (4): 435–441.
Published: 01 December 2002
... additional impacts on natural resources. In using the index, any concentration of Aureococ- cus anophagefferens less than 35,000 cells ml¡1 should be considered Category 1. Category 1 is based upon only a few scientiŽ c studies that document a dose- response relative to the toxicity of the alga to living...
Journal Article
Aquatic Ecosystem Health & Management (1999) 2 (2): 187–189.
Published: 01 January 1999
... (Daphnia similis), macrophytes (Lemna sp.) and periphytic algae (Selenastrum capricomutum). These organisms will be exposed to test waters and evaluated with regard to acute toxicity (survival) and chronic toxicity (photosynthesis, respiration, excretion, growth and reproduction). An extensive training...
Journal Article
Aquatic Ecosystem Health & Management (2005) 8 (1): 95–104.
Published: 01 January 2005
..., Haptophyceae) associated with fish mortalities in hypereutrophic brackish lake in Morocco . Harmful Alga News , 21 : 8 – 9 . Sabour , B. , Loudiki , M , Oudra , B. , Belkoura , M , Vasconcelos , V and Oufara , S. Effect of light and temperature on the growth of two toxic...
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Journal Article
Aquatic Ecosystem Health & Management (2003) 6 (4): 409–413.
Published: 01 December 2003
... cells (Ohtake et al., 1989; Shirai et al., 1991; Song et al., 1998), and concentrated by de- cantation under natural light. The concentrated algae material was preserved at 20 C until lyophilization. Hepatotoxity detection by ELISA The toxicity of the different aliquots from raw cul- tures was measured...
Journal Article
Aquatic Ecosystem Health & Management (1998) 1 (3-4): 333–343.
Published: 01 January 1998
... are filter-feeders consuming bacteria, protozoa, and small algae (Arndt, 1993; Nogrady, 1993). Rotifers were present in low numbers during the first sampling date but rapidly increased, reaching densities up to 8960 ind. 1 In September, probably because of the toxic effect of 2,4-D and the reduction...