Effects of ammonium supply rates on competition between Microcystis novacekii (Cyanobacteria) and Scenedesmus quadricauda (Chlorophyta): simulation study

Kuwata, Akira; Miyazaki, Tatsuo

doi:10.1016/s0304-3800(00)00363-x

Cited by 34 publications

(24 citation statements)

References 22 publications

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“…However, N half saturation constants for the cyanobacteria group were minimized, set here at a value of 0.002 mg/L to represent the nitrogen-fixing capability of this algal group. Also, the cyanobacteria group was modeled with a higher affinity for NH 4 than other algal groups (Kuwata and Miyazaki 2000). This increased predicted productivity of this algal group during late summer and early fall when NO 2 and NO 3 had lowered concentrations in the reservoir (Fig.…”

Section: Discussionmentioning

confidence: 99%

A combined watershed–water quality modeling analysis of the Lake Waco reservoir: I. Calibration and confirmation of predicted water quality

White

Prochnow

Filstrup

et al. 2010

Lake and Reservoir Management

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Section: Discussionmentioning

confidence: 99%

A combined watershed–water quality modeling analysis of the Lake Waco reservoir: I. Calibration and confirmation of predicted water quality

White

Prochnow

Filstrup

et al. 2010

Lake and Reservoir Management

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“…Recent increases in ammonium concentration in the western delta may give a competitive advantage to Microcystis which rapidly assimilates ammonium over nitrate (Blomqvist et al, 1994;Jassby, 2005). However, recent reductions in river flow may have had a greater influence on abundance (Kuwata & Miyazaki, 2000;Lehman et al, 2008).…”

Section: Phytoplanktonmentioning

confidence: 99%

Initial impacts of Microcystis aeruginosa blooms on the aquatic food web in the San Francisco Estuary

Lehman¹,

et al. 2009

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The impact of the toxic cyanobacterium Microcystis aeruginosa on estuarine food web production in San Francisco Estuary is unknown. It is hypothesized that Microcystis contributed to a recent decline in pelagic organisms directly through its toxicity or indirectly through its impact on the food web after 1999. In order to evaluate this hypothesis, phytoplankton, cyanobacteria, zooplankton, and fish were collected biweekly at stations throughout the estuary in 2005. Concentrations of the tumor-promoting Microcystis toxin, microcystin, were measured in water, plankton, zooplankton, and fish by a protein phosphatase inhibition assay, and fish health was assessed by histopathology. Microcystis abundance was elevated in the surface layer of the western and central delta and reached a maximum of 32 9 10 9 cells l -1 at Old River in August. Its distribution across the estuary was correlated with a suite of phytoplankton and cyanobacteria species in the surface layer and 1 m depth including Aphanizomenon spp., Aulacoseira granulata, Bacillaria paradoxa, Rhodomonas spp., and Cryptomonas spp. Shifts in the phytoplankton community composition coincided with a decrease in the percentage of diatom and green algal carbon and increase in the percentage of cryptophyte carbon at 1 m depth. Maximum calanoid and cyclopoid copepod carbon coincided with elevated Microcystis abundance, but it was accompanied by a low cladocera to calanoid copepod ratio. Total microcystins were present at all levels of the food web and the greater total microcystins concentration in striped bass than their prey suggested toxins accumulated at higher trophic levels. Histopathology of fish liver tissue suggested the health of two common fish in the estuary, striped bass (Morone saxatilis), and Mississippi silversides (Menidia audens), was impacted by tumor-promoting substances, particularly at stations where total microcystins concentration was elevated. This study suggests that even at low abundance, Microcystis may impact estuarine fishery production through toxic and food web impacts at multiple trophic levels.

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“…Many recent studies have analyzed dominant species displacement and replacement in algae bloom and non-bloom (Kuwata and Miyazaki, 2000;Hillmer et al, 2008), even niche theory implication in replacement between two dominant species in Lake Kastoria (Moustaka-Gouni et al, 2007), and rRNA genes technology implied in observing dominant phytoplankton succession (Newton et al, 2006). However, little research is focused on the effect of dominant species on changes in community composition and biodiversity in a stressed environment.…”

Section: Niche Theory and The Roles Of Dominant Speciesmentioning

confidence: 99%

A comparative study of the impact of species composition on a freshwater phytoplankton community using two contrasting biotic indices

Guo

Liu

et al. 2010

Ecological Indicators

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Effects of ammonium supply rates on competition between Microcystis novacekii (Cyanobacteria) and Scenedesmus quadricauda (Chlorophyta): simulation study

Cited by 34 publications

References 22 publications

A combined watershed–water quality modeling analysis of the Lake Waco reservoir: I. Calibration and confirmation of predicted water quality

A combined watershed–water quality modeling analysis of the Lake Waco reservoir: I. Calibration and confirmation of predicted water quality

Initial impacts of Microcystis aeruginosa blooms on the aquatic food web in the San Francisco Estuary

A comparative study of the impact of species composition on a freshwater phytoplankton community using two contrasting biotic indices

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