Biogeochemical cycles during the species succession from Skeletonema costatum to Alexandrium tamarense in northern Hiroshima Bay

Yamamoto, Tamiji; Inokuchi, Yuko; Sugiyama, Teiji

doi:10.1016/j.jmarsys.2004.03.004

Cited by 20 publications

(8 citation statements)

References 15 publications

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“…In the Seto Inland Sea, Yamamoto et al (2004) reported that "a decrease of DOP and DON seemed to coincide with A. tamarense blooms, suggesting utilization of DOM by A.…”

Section: Discussionmentioning

confidence: 99%

Comparing diatom and Alexandrium catenella/tamarense blooms in Thau lagoon: Importance of dissolved organic nitrogen in seasonally N-limited systems

et al. 2014

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Diatom blooms in Thau lagoon are always related to rain events leading to inputs of inorganic nutrients such as phosphate, ammonium and nitrate through the watershed with time lags of about 1 week. In contrast, blooms of Alexandrium catenella/tamarense can occur following periods of 3 weeks without precipitation and no significant input of conventional nutrients such as nitrate and phosphate. Field results also indicate a significant drop (from 22-25 to 15-16 μM over 3 days) in dissolved organic nitrogen (DON) at the bloom peak, as well as a significant inverse relationship between A. catenella/tamarense cell density and DON concentrations that is not apparent for diatom blooms. Such dinoflagellate blooms are also associated with elevated (6-9 μM) ammonium concentrations, a curious feature also observed by other investigators, possibly the results of ammonium excretion by this organism during urea or other organic nitrogen assimilation. The potential use of DON by this organism represents short cuts in the nitrogen cycle between plants and nutrients and requires a new model for phytoplankton growth that is different from the classical diatom bloom model. In contrast to such diatom blooms that are due to conventional (nitrate, phosphate) nutrient pulses, Alexandrium catenella/tamarense blooms on the monthly time scale are due to organic nutrient enrichment, a feature that allows net growth rates of about 1.3 d −1 , a value higher than that generally attributed to such organisms.

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“…In the Seto Inland Sea, Yamamoto et al (2004) reported that "a decrease of DOP and DON seemed to coincide with A. tamarense blooms, suggesting utilization of DOM by A.…”

Section: Discussionmentioning

confidence: 99%

Comparing diatom and Alexandrium catenella/tamarense blooms in Thau lagoon: Importance of dissolved organic nitrogen in seasonally N-limited systems

et al. 2014

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“…Thus, a significant difference was found in the ratio of C:N between September and January (p = 0.018, n = 3). Furthermore, the decrease in C:N can be due to an increase in DON produced from nitrate by N-fixing cyanobacteria and heterotrophic bacteria (Wetz and Wheeler, 2003;Simjouw et al, 2004;Yamanoti et al, 2004;Mei et al, 2005;McCarthy et al, 2007) because a depleted nitrate concentration was observed around October in all three sampling regions. This result indicates that HMW-DOM changed from a Cenriched to an N-enriched component after the bloom.…”

Section: Carbon To Nitrogen Ratio Of Hmw-dommentioning

confidence: 95%

Dynamics of dissolved organic carbon after a cyanobacterial bloom in hypereutrophic Lake Taihu (China)

Shi

et al. 2011

Limnologica

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a b s t r a c tTo establish the influence of the cyanobacterial bloom collapse on the characteristics of dissolved organic carbon (DOC) in Lake Taihu, high-molecular-weight dissolved organic matter (HMW-DOM), with sizes between 1 kDa and 0.5 m, were collected using cross-flow ultrafiltration, from three different eutrophic regions. Isolated HMW-DOM was further characterized by atomic carbon to nitrogen ratio and neutral sugars composition by gas chromatography and mass spectrometry. The results indicated that the cyanobacterial cell lysis induced by nitrate depletion is the likely mechanism for DOC release. The relatively high DOC level was associated with the high chlorophyll a concentration in Meiliang Bay, one of the most eutrophic bays in the northern part of the lake. However, no significant correlations were observed between chlorophyll a concentration and HMW-DOC concentration during the demise of the cyanobacterial bloom in Lake Taihu. No significant differences were found in the HMW-DOC concentration among the three sampling sites, which were selected to represent different eutrophic status. However, a significant difference in the HMW-DOC concentration was found between October 2009 and January 2010 in all three sampling sites (p = 0.02). The HMW-DOC release may be attributed to the cyanobacterial cell lysis after the peak of summer bloom. The similarity in neutral sugar composition between the HMW-DOM and cyanobacterial exopolysaccharides suggests that the cyanobacterial bloom is the source of HMW-DOM. However, the significant correlation between the carbon to nitrogen ratio in HMW-DOM and chlorophyll a concentration was only observed in Meiliang Bay, which implies that apart from the cyanobacteria-derived DOC, a fraction of DOC was from riverine input. The decline of the cyanobacterial bloom also changed the overall DOM pool, leading to a shift in the component of HMW-DOM from a C-enriched material to an N-enriched material, as revealed by the variation in the carbon to nitrogen ratios. Overall, these results demonstrate that the quantitative and qualitative DOM is affected by the post-cyanobacterial bloom in Lake Taihu.

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“…In the case of nitrogen, its gaseous forms are involved in the cycling processes in ecosystems, and its fixation would interfere with the reduction measures. However, several studies have pointed out that the reduction of only phosphorus will lead to an imbalance in the ratios between phosphorus and other elements and could alter the composition of phytoplankton species in coastal seas (Tilman et al, 1982;Lee et al, 1996;Yamamoto et al, 1999;Yamamoto et al, 2004a).…”

Section: Introductionmentioning

confidence: 99%

Assessing responses of the Hiroshima Bay ecosystem to increasing or decreasing phosphorus and nitrogen inputs

Kittiwanich

Yamamoto

Kawaguchi

et al. 2016

Marine Pollution Bulletin

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Biogeochemical cycles during the species succession from Skeletonema costatum to Alexandrium tamarense in northern Hiroshima Bay

Cited by 20 publications

References 15 publications

Comparing diatom and Alexandrium catenella/tamarense blooms in Thau lagoon: Importance of dissolved organic nitrogen in seasonally N-limited systems

Comparing diatom and Alexandrium catenella/tamarense blooms in Thau lagoon: Importance of dissolved organic nitrogen in seasonally N-limited systems

Dynamics of dissolved organic carbon after a cyanobacterial bloom in hypereutrophic Lake Taihu (China)

Assessing responses of the Hiroshima Bay ecosystem to increasing or decreasing phosphorus and nitrogen inputs

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