Mechanisms to develop a Heterosigma akashiwo red tide in Osaka bay.

Yamochi, Susumu

doi:10.2965/jswe1978.8.424

Cited by 18 publications

(32 citation statements)

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“…akashiwo may be able to overwinter as motile cells, as the motile form has been observed in the winter (Yamochi, 1989;Honjo, 1993). The major seed population for early-summer red tide outbreaks of this organism, however, is the cyst population in bottom sediments (Smayda, 1998).…”

Section: Temperature Effectsmentioning

confidence: 94%

“…In the coastal waters of western Japan, however, the water temperature of the bottom layer is higher than 15 8C for more than 6 months of each year, yet Heterosigma red tides tend to occur in early summer (Honjo, 1993;Imai, 2000). Furthermore, Imai et al (1996) and Yamochi (1989) reported conflicting results with regard to the effect of light on the germination of Heterosigma cysts. Since the conditions for germination of Heterosigma cysts are still poorly understood, in this study, we examined the effects of temperature and light on the cyst germination.…”

Section: Introductionmentioning

confidence: 93%

“…akashiwo inhabits bottom sediments in forms that allow survival under low temperature and dark conditions; these forms have been referred to as ''benthic stage cells'' (Tomas, 1978b;Yamochi, 1989), ''cysts'' (Imai et al, 1993), and ''resting cells'' (Han et al, 2002). A benthic stage cell differs from a cyst in the number of chloroplasts (Smayda, 1998).…”

Section: Introductionmentioning

confidence: 98%

“…To elucidate the population dynamics of Heterosigma during the initial phase of a red tide outbreak, it is important to examine the conditions that liberate cysts from bottom sediments. Previous studies have examined the effects of temperature (Yamochi and Joh, 1986;Imai and Itakura, 1999), light (Yamochi, 1989;Imai et al, 1996), and dissolved oxygen concentration on the emergence of Heterosigma motile cells from bottom sediments. Imai and Itakura (1999) reported that cyst germination was largely controlled by temperature, and was markedly activated when bottom water temperature exceeded 15 8C.…”

Section: Introductionmentioning

confidence: 99%

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Effects of temperature and light on cyst germination and germinated cell survival of the noxious raphidophyte Heterosigma akashiwo

et al. 2007

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Section: Temperature Effectsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of temperature and light on cyst germination and germinated cell survival of the noxious raphidophyte Heterosigma akashiwo

et al. 2007

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“…In the Seto Inland Sea, long-term variations in some phytoplankton species have been studied, but most of the studies have focused on only one or a few species, mostly harmful or toxic species causing economic losses (e.g., mass mortality of fish and shellfish), such as Heterosigma akashiwo (Yamochi 1989), Heterocapsa circularisquama (Matsuyama 2003), and Alexandrium tamarense Yamaguchi et al 2002). There are very few studies that have documented long-term variations of various species or phytoplankton groups in the eastern Seto Inland Sea.…”

Section: Introductionmentioning

confidence: 99%

Nutrient and Phytoplankton Dynamics in Harima-Nada, Eastern Seto Inland Sea, Japan During a 35-Year Period from 1973 to 2007

Nishikawa

Hori

Nagai

et al. 2009

Estuaries and Coasts

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Long-term monitoring of water quality and phytoplankton was conducted at 19 sampling stations in Harima-Nada, eastern Seto Inland Sea, Japan for 35 years from 1973 to 2007. There were two significant long-term changes, an increase in winter water temperatures of 0.042°C year −1 , and a decrease in dissolved inorganic nitrogen (DIN) from about 10 μM in the 1970s to~5 μM in the late 1990s due to the reduction in nutrient inputs. DIN concentrations and total phytoplankton cell density were both higher during the 1970s to the early 1980s and then exhibited a significant decrease in the mid 1980s and remained relatively constant thereafter. Diatoms were the dominant phytoplankton group (>90%) over the 35-year period, and there was a dramatic shift from Skeletonema dominance (~70%) to Chaetoceros in the mid 1980s. This shift in diatom species may be attributed to differences in the life cycle of Skeletonema and Chaetoceros and the response to the decrease in DIN concentration.

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Effect of biodegradable chelating ligands on Fe uptake in and growth of marine microalgae

et al. 2018

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Iron (Fe) is an important nutrient for phytoplankton. The low solubility of Fe in oxic waters can be a growth-limiting factor for phytoplankton. Synthetic aminopolycarboxylates (APCs) such as ethylenediaminetetraacetic acid (EDTA) and diethylenetriaminepentaacetic acid (DTPA) are widely used as Fe complexing agents for microalgae culture. However, the presence of these non-ready biodegradable APC S in aquatic systems may have serious environmental consequences. In the present study, the effects of biodegradable chelating ligands (hydroxyiminodisuccinic acid (HIDS), methylglycinediacetic acid (MGDA), and iminodisuccinate (IDS)) on Fe uptake in and growth of three coastal microalgae (Heterosigma akashiwo, Prymnesium parvum, and Skeletonema marinoi-dohrnii complex) were investigated, and the results were compared with those of non-ready biodegradable APCs (EDTA, ethylenediamine tetra-methylene phosphonic acid (EDTMP), and DTPA). The biodegradable chelating ligands did not have significant growth inhibition effect on the phytoplankton. Although the growth of the algae (except S. marinoi-dohrnii complex) was not affected substantially by 1.5 and 7.5 μM of DTPA, growth inhibition occurred by 7.5 μM of EDTMP and 150 μM of EDTA, DTPA, and EDTMP. The effect of chelating ligands on microalgal growth was likely to be associated with the intracellular Fe uptake influenced by the chelating ligands. On average, intracellular Fe concentrations for biodegradable chelating ligands were substantially higher than those for non-ready biodegradable APCs. Except H. akashiwo, the ratio of intra/extracellular Fe concentrations was highest for MGDA followed by IDS and HIDS. The results indicate that biodegradable chelating ligands are more efficient than non-ready biodegradable APCs in intracellular Fe uptake and algal growth.

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Mechanisms to develop a Heterosigma akashiwo red tide in Osaka bay.

Cited by 18 publications

References 0 publications

Effects of temperature and light on cyst germination and germinated cell survival of the noxious raphidophyte Heterosigma akashiwo

Effects of temperature and light on cyst germination and germinated cell survival of the noxious raphidophyte Heterosigma akashiwo

Nutrient and Phytoplankton Dynamics in Harima-Nada, Eastern Seto Inland Sea, Japan During a 35-Year Period from 1973 to 2007

Effect of biodegradable chelating ligands on Fe uptake in and growth of marine microalgae

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