Effect of light availability on Microcystis aeruginosa blooms in shallow hypereutrophic Lake Kasumigaura

Tomioka, Noriko; Imai, Akio; Komatsu, Kazuhiro

doi:10.1093/plankt/fbr020

Cited by 41 publications

(22 citation statements)

References 33 publications

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“…A different ecological strategy was found in Microcystis sp. 1, the most tolerant strain, which is in agreement with other studies that demonstrate a high tolerance to high light intensities and UVR (Sommaruga et al, 2009;Tomioka et al, 2011). These colonial taxa accumulate, forming scums on the water surface where they can be exposed to high irradiances.…”

Section: Uv-b Treatmentsupporting

confidence: 90%

Influence of UV-B radiation on the fitness and toxin expression of the cyanobacterium Cylindrospermopsis raciborskii

et al. 2015

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The harmful bloom-forming cyanobacterium Cylindrospermopsis raciborskii grows in freshwaters over a wide range of light conditions. This species has increased its global distribution recently. The influence of ultraviolet radiation (UVR) on the fitness and toxin production of C. raciborskii has not previously been explored. We performed short-term experiments with three C. raciborskii strains (MVCC19, LB2897, and CYP011 K), and we compared their responses with other bloom-forming species (Microcystis sp.1 and Plankthotrix agardhii) to determine the impact of UV-B radiation on pigments, biomass, and morphological traits. In addition, we analyzed the effect of UV-B on the saxitoxin content and sxtU gene expression in the strain MVCC19. C. raciborskii strains were stressed differentially by UV-B exposure as evidenced by changes in growth, morphology, and heterocytes number. A significant increase in saxitoxin concentration and sxtU gene expression under UV-B suggests that toxin production in C. raciborskii can be a response to UV-B stress. In comparison, Microcystis sp.1 was more tolerant, while P. agardhii was severely impacted by UV-B, indicating also different sensitivities among cyanobacteria to UVR. Our results underscore the influence of UVR on C. raciborskii and the differences between strains which showed phenotypic plasticity, which potentially could affect its distribution in freshwaters.

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Section: Uv-b Treatmentsupporting

confidence: 90%

Influence of UV-B radiation on the fitness and toxin expression of the cyanobacterium Cylindrospermopsis raciborskii

et al. 2015

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“…The large impact of light condition to the a Ã ph k ð Þ has been well reported (Moore et al, 1995;Fujiki & Taguchi, 2002). Tomioka et al (2011) reported that underwater irradiance affects to the bloom of M. aeruginosa in Lake Kasumigaura. Since M. aeruginosa shows distinct pigment composition (especially the one represented by the existing of phycocyanin) from other phytoplankton and small cell size, the light availability can be one of the important factors to determine the package effect and effect of accessory pigment.…”

Section: Discussionmentioning

confidence: 63%

Parameterization of chlorophyll a-specific absorption coefficients and effects of their variations in a highly eutrophic lake: a case study at Lake Kasumigaura, Japan

et al. 2012

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The chlorophyll a-specific absorption coefficient (a Ã ph k ð Þ) in a highly eutrophic lake can show characteristics distinct from that in the ocean due to the differences in the structure and composition of phytoplankton. In this study, investigated the variation of a Ã ph k ð Þ in Lake Kasumigaura, a highly eutrophic lake in Japan, in association with the package effect and the effect of accessory pigments, and carried out the parameterization of a Ã ph k ð Þ. Although a Ã ph k ð Þ did not vary spatially, it did show significant temporal variation, with a particularly high value after springbloom. This high a Ã ph k ð Þ in spring was attributed to a lower package effect and a higher proportion of carotenoid than the other samples. Although the value of a Ã ph k ð Þ was correlated with the concentration of chlorophyll-a (Chl-a), the correlation coefficient was lower than those reported in the ocean. Some lakewater samples showed variations of the package effect and the effect of accessory pigments that were independent of the concentration of Chl-a, and these independent variations resulted in the weak correlation between a Ã ph k ð Þ and the concentration of Chl-a. Together, these results suggest that the factors controlling a Ã ph k ð Þ in highly eutrophic lakes are distinct from that in ocean samples.Keywords Chlorophyll a-specific absorption coefficient Á Temporal/spatial variations Á Highly eutrophic lake water Á Package effect Á Effect of accessory pigments

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“…, , Tomioka et al. , Fukushima and Arai ). For zooplankton, we used the abundances of five zooplankton functional groups (large cladocerans, small cladocerans, rotifers, cyclopoids, and calanoids; Takamura et al.…”

Section: Introductionmentioning

confidence: 98%

Bottom‐up linkages between primary production, zooplankton, and fish in a shallow, hypereutrophic lake

Matsuzaki

Suzuki

Kadoya

et al. 2018

Ecology

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Nutrient supply is a key bottom-up control of phytoplankton primary production in lake ecosystems. Top-down control via grazing pressure by zooplankton also constrains primary production and primary production may simultaneously affect zooplankton. Few studies have addressed these bidirectional interactions. We used convergent cross-mapping (CCM), a numerical test of causal associations, to quantify the presence and direction of the causal relationships among environmental variables (light availability, surface water temperature, NO -N, and PO -P), phytoplankton community composition, primary production, and the abundances of five functional zooplankton groups (large cladocerans, small cladocerans, rotifers, calanoids, and cyclopoids) in Lake Kasumigaura, a shallow, hypereutrophic lake in Japan. CCM suggested that primary production was causally influenced by NO -N and phytoplankton community composition; there was no detectable evidence of a causal effect of zooplankton on primary production. Our results also suggest that rotifers and cyclopoids were forced by primary production, and cyclopoids were further influenced by rotifers. However, our CCM suggested that primary production was weakly influenced by rotifers (i.e., bidirectional interaction). These findings may suggest complex linkages between nutrients, primary production, and rotifers and cyclopoids, a pattern that has not been previously detected or has been neglected. We used linear regression analysis to examine the relationships between the zooplankton community and pond smelt (Hypomesus nipponensis), the most abundant planktivore and the most important commercial fish species in Lake Kasumigaura. The relative abundance of pond smelt was significantly and positively correlated with the abundances of rotifers and cyclopoids, which were causally influenced by primary production. This finding suggests that bottom-up linkages between nutrient, primary production, and zooplankton abundance might be a key mechanism supporting high planktivore abundance in eutrophic lakes. Because increases in primary production and cyanobacteria blooms are likely to occur simultaneously in hypereutrophic lakes, our study highlights the need for ecosystem management to resolve the conflict between good water quality and high fishery production.

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Effect of light availability on Microcystis aeruginosa blooms in shallow hypereutrophic Lake Kasumigaura

Cited by 41 publications

References 33 publications

Influence of UV-B radiation on the fitness and toxin expression of the cyanobacterium Cylindrospermopsis raciborskii

Influence of UV-B radiation on the fitness and toxin expression of the cyanobacterium Cylindrospermopsis raciborskii

Parameterization of chlorophyll a-specific absorption coefficients and effects of their variations in a highly eutrophic lake: a case study at Lake Kasumigaura, Japan

Bottom‐up linkages between primary production, zooplankton, and fish in a shallow, hypereutrophic lake

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