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

Tomoyuki Shikata, Sou Nagasoe, Tadashi Matsubara, Yasuhiro Yamasaki, Yohei Shimasaki, Yuji Oshima, Tsuneo Honjo

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

The effects of temperature and light on the germination of Heterosigma akashiwo cysts were examined using bottom sediments collected from Hakata Bay, Japan. In a suspension of mixed sediment and seawater in the temperature range of 5-30 °C, motile cells emerged within 3 weeks, but at ≤12 °C the cell numbers were markedly lower and the emergence of motile cells delayed. When suspension samples incubated at various temperatures were moved to 20 °C and incubated, only a few additional motile cells emerged. The number of motile cells germinated in the dark was significantly lower than under light conditions. When suspension samples incubated in the dark were exposed to light, only a few additional motile cells emerged. These results indicate that the initiation of germination in Heterosigma cysts suspended in seawater is not dependent on temperature and light conditions, although the speed of the germination process is affected by temperature, and cell survival just after germination is strongly affected by temperature and light.

Original languageEnglish
Pages (from-to)700-706
Number of pages7
JournalHarmful Algae
Volume6
Issue number5
DOIs
Publication statusPublished - Oct 1 2007
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Aquatic Science
  • Plant Science

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