Influence on seaweed-bed exerted by suspended matters. I. Influence on sedimentation velocity of brown algae zoospores and their base-plate insertion exerted suspended matters.

Arakawa, Hisayuki; Matsuike, Kanau

doi:10.2331/suisan.56.1741

Cited by 18 publications

(15 citation statements)

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“…The swimming speed was about three times faster than the sinking speed (48.7 μm/s) of floating spores. The sinking speed of floating spores was lower than that reported for the zoospores of U. pinnatifida (108–142 μm/s) 12 . In general, large algal spores sink faster than small ones 13,14 .…”

Section: Discussioncontrasting

confidence: 59%

“…The sinking speed of floating spores was lower than that reported for the zoospores of U. pinnatifida (108-142 mm/s). 12 In general, large algal spores sink faster than small ones. 13,14 However, the zoospores of L. japonica are larger (11.3 mm¥ 5.4 mm) than the…”

Section: Discussionmentioning

confidence: 99%

“…Two capillary tubes (F = 0.75 mm) were inserted from either side into the central vinyl tube. One capillary tube, serving as a control, contained ASP 12 without nitrate or phosphate, while the other contained ASP 12 with either nitrate or phosphate as a chemical stimulant. Five discrete concentrations of seawater (0, 1.3, 11.0, 200.0 mM nitrate-N, 0, 1.7, 7.0, 9.7, 100.0 mM phosphate-P) were prepared by adding sodium nitrate or sodium hydrogen phosphate to the artificial seawater.…”

Section: Chemotaxis and Photosynthesis Of Zoosporesmentioning

confidence: 99%

“…7c). The index was low (10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) in seawater with a pH of 6, 8 and 9. In contrast, the zoospores showed a high negative chemotaxis index (-60) at pH 10, and the zoospores incubated at pH 10 were not able to swim for as long as those incubated in other pH conditions.…”

Section: Chemotaxis and Photosynthesis Of Zoosporesmentioning

confidence: 99%

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Swimming activities of zoospores in Laminaria japonica (Phaeophyceae)

2002

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The release of zoospores from zoosporangia in Laminaria japonica mainly occurred at night. The maximum swimming speed of the zoospores was observed immediately after release (~160 μm/s), and then decreased with time. The zoospores exhibited clear chemotaxis to high concentrations of nitrate‐N and phosphate‐P. Only half of the zoospores were observed to swim against seawater with a flow velocity of 124 μm/s. The zoospores became floating spores after they stopped swimming in the seawater. Low light and low water temperature conditions prolonged the swimming period of the zoospores. However, the photosynthesis of the zoospores was suppressed in low water temperatures, and was also limited under high light irradiance. These results suggest that photosynthesis in zoospores does not prolong their swimming period, and that when their swimming energy is exhausted, floating spores appear.

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Section: Discussioncontrasting

confidence: 59%

Section: Discussionmentioning

confidence: 99%

Section: Chemotaxis and Photosynthesis Of Zoosporesmentioning

confidence: 99%

Section: Chemotaxis and Photosynthesis Of Zoosporesmentioning

confidence: 99%

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Swimming activities of zoospores in Laminaria japonica (Phaeophyceae)

2002

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“…That is to say, the lower swimming force of the zoospores and the lower ability to attach to the substrate may be caused by the adhering of the particles to the zoospores. Also, in a previous study, it was reported that zoospores to which suspended particles had adhered to in turbid seawater, the swimming and sedimentation velocity of the zoospores with particles adhered was lower, and the success rate of substrate attachment decreased 7 . In addition, it is intuitively clear that the attachment behavior of the zoospores is disturbed when there is sediment cover on the substrate.…”

Section: Discussionmentioning

confidence: 91%

Lethal effects caused by suspended particles and sediment load on zoospores and gametophytes of the brown alga Eisenia bicyclis

Arakawa

2005

Fisheries Sci

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The effects caused by suspended particles in seawater and sediment cover of the substrate on the attachment to the substrate of zoospores, and on the subsequent growth and survival of gametophytes of the brown alga Eisenia bicyclis were examined in the laboratory. The attachment rate to the substrate of the zoospores was remarkably reduced by the sediment cover on the substrate, and it decreased to 3.8% of the no-sediment control by a slight sediment cover of 3.0 mg/cm 2 (0.048 mm in thickness). The growth of gametophytes was not inhibited at 10 mg/cm 2 or less of sediment cover, though it was stopped at 30 mg/cm 2 . The survival rate of gametophytes became 39.4% at 5 mg/cm 2 on the substrate, and gametophytes were all blighted at 30 mg/cm 2 . The ratio of male to female of the surviving gametophytes became 81.5:18.5, when the sediment cover was 10 mg/cm 2 . The rate of total loss ( TL [%]) of zoospores and gametophytes of Eisenia bicyclis was obtained from the following equation:, where, C (mg/L) and Q (mg/cm 2 ) indicate the concentration of suspended particles in seawater and the sediment on the substrate, respectively.

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