Morphology and Rejuvenation of Coscinodiscus wailesii GRAN (Bacillariophyceae) Resting Cells Found in Bottom Sediments of Harima-Nada, Seto Inland Sea, Japan.

Seasonal and year-on-year variability in chlorophyll a and microphytoplankton assemblages for 9 years (2001^|^ndash;2009) in the neritic area of Sagami Bay, Japan

“…This result was unexpected, since Coscinodiscus species (e.g. C. wailesii) have been reported to form resting cells and spend time in the sediments during the summer stratified period of unsuitable nutrient-depleted conditions (Nagai et al 1995, Nagai & Imai 1999, and Eucampia zodiacus either has no resting stage in its life cycle or its resting period is much shorter than other diatom species possessing resting stages, even under nutrient-depleted conditions (Nishikawa et al 2007), although diatom resting stages were not investigated in the present study.…”

Population dynamics of the harmful diatom Eucampia zodiacus Ehrenberg causing bleachings of Porphyra thalli in aquaculture in Harima-Nada, the Seto Inland Sea, Japan

“…For example, resting stage cells were found in the diatoms such as S. costatum (Itakura et al, 1992), Chaetoceros pseudocurvisetus Mangin (Kuwata et al, 1993;Oku and Kamatani, 1999), Leptocylindrus danicus Cleve (French and Hargraves, 1986) and C. wailesii (Nagai et al, 1995a). During the period from April to September, when the water column is stratified, conditions are thought to be unsuitable for vegetative growth of larger diatom species .…”

“…Studies were conducted to elucidate the mechanisms of massive occurrences of C. wailesii. For instance, Nagai et al (1995a) identified the resting cells of C. wailesii for the first time from the sediments of Harima-Nada. Nagai et al (1996) revealed that the vegetative cells started to grow in September when vertical mixing started and continued until next spring.…”

Effect of temperature on light-limited growth of the harmful diatom Coscinodiscus wailesii, a causative organism in the bleaching of aquacultured Porphyra thalli

“…Previous studies elucidated the life cycle and ecology of C. wailesii in Harima-Nada. For instance, Nagai et al (1995) found the resting cells of C. wailesii for the first time in the sediments of Harima-Nada and its vegetative cells started to grow in September when vertical mixing of the water column occurred . In addition, this organism accounts for a significant biomass of phytoplankton during the period of well-mixed water (Tada et al, 2000;Ono et al, 2006).…”