Morphology and Ecology of the Bloom-forming Planktonic Diatom Chaetoceros salsugineus Takano in the Sea of Japan

Abstract

The morphology of Chaetoceros salsugineus Takano is described using both light and electron microscopy. This species possesses typical characteristics of the subgenus Hyalochaete. Our investigations show that intercalary valves having processes are actually terminal valves, in the area of contact of which the colony disintegrates into separate short chains. Chaetoceros salsugineus occurred annually in the summer period and was abundant during the summer bloom of phytoplankton. Maximum densities (up to 12 millions cells L" 1 ) were recorded near the water surface after heavy rains when stratification of the water column occurs. Some taxonomic and autoecological questions are discussed.

Previously Unknown Virus Infects Marine Diatom

“…It is small (2.0 to 9.5 m wide) and forms short or long straight chains (22). The occurrence of C. salsugineum has been reported in Tachibanaura (Tokushima Prefecture), Osaka Bay (Osaka Prefecture), Atsumi Bay (Aichi Prefecture), Lake Hamana (Shizuoka Prefecture), and Ariake Sea (Fukuoka Prefecture) in Japan (22; the present study), Vostok Bay in Russia (16), and Urdaibai estuary in Spain (27). Since there have been no reports of its negative impacts on fisheries, the main ecological implication of this species is as primary photosynthetic producers in brackish lakes and estuarine waters.…”

Diversity of the diatom genus Pseudo-nitzschia Peragallo in the Quoddy Region of the Bay of Fundy, Canada

“…For example, the centric diatom Chaetoceros salsugineus, occurs as single cells and/or in colonies depending on the season (Orlova and Selina, 1993). An araphid pennate, Tabellaria flocculosa, may co-exist as either a planktonic or an epiphytic form in the same lake (Knudson, 1953).…”

Lipid and Fatty Acid Composition during Vegetative and Resting Stages of the Marine Diatom Chaetoceros salsugineus

“…The species Chaetoceros salsugineus Tanako is observed in the coastal waters of Primorye in the Sea of Japan and its blooms have been reported to be common during the summer, specifically after heavy rains (Orlova and Selina 1993). Chaetoceros species are common in coastal waters, surpassing other groups of microalgae in density and biomass.…”