Carbohydrate fluctuations, gas vacuolation, and vertical migration of scum‐forming cyanobacteria in fishponds1

Rijn, Jaap van; Shilo, Moshe

doi:10.4319/lo.1985.30.6.1219

Cited by 53 publications

(30 citation statements)

References 19 publications

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“…2). The 0300-h peak resulted from an accumulation of M. aeruginosa in the surface water caused by a wellknown diel vertical migration by M. aeruginosa (30,43). The PC-IGS gene copy numbers in the second sampling also showed a pattern similar to that in the first (Fig.…”

Section: Resultsmentioning

confidence: 53%

Diurnal Infection Patterns and Impact of Microcystis Cyanophages in a Japanese Pond

Kimura

Yoshida

Hosoda

et al. 2012

Appl Environ Microbiol

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bViruses play important roles in regulating the abundance, clonal diversity, and composition of their host populations. To assess their impact on the host populations, it is essential to understand the dynamics of virus infections in the natural environment. Cyanophages often carry host-like genes, including photosynthesis genes, which maintain host photosynthesis. This implies a diurnal pattern of cyanophage infection depending on photosynthesis. Here we investigated the infection pattern of Microcystis cyanophage by following the abundances of the Ma-LMM01-type phage tail sheath gene g91 and its transcript in a natural population. The relative g91 mRNA abundance within host cells showed a peak during the daylight hours and was lowest around midnight. The phage g91 DNA copy numbers in host cell fractions, which are predicted to indicate phage replication, increased in the afternoon, followed by an increase in the free-phage fractions. In all fractions, at least 1 of 71 g91 genotypes was observed (in tested host cell, free-phage, and RNA fractions), indicating that the replication cycle of the cyanophage (i.e., injection, transcription, replication, and release of progeny phages) was occurring. Thus, Microcystis cyanophage infection occurs in a diel cycle, which may depend on the light cycle. Additionally, our data show that the abundance of mature cyanophage produced within host cells was 1 to 2 orders of magnitude greater than that of released phages, suggesting that phage production may be higher than previously reported.

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Section: Resultsmentioning

confidence: 53%

Diurnal Infection Patterns and Impact of Microcystis Cyanophages in a Japanese Pond

Kimura

Yoshida

Hosoda

et al. 2012

Appl Environ Microbiol

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“…The most comprehensive studies of changes in excess density have concerned the buoyancy of blue-green algae, where overall buoyancy conferred by gas vesicles can be modified by changes in cellular carbohydrate (e.g. van Rijn & Shilo 1985, Walsby et al 1989, Ibelings et al 1991, Romans et al 1994.…”

Section: P%mentioning

confidence: 99%

Changes in buoyancy and chemical composition during growth of a coastal marine diatom:ecological and biogeochemical consequences

Richardson¹,

Cullen²

1995

Mar. Ecol. Prog. Ser.

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Growth and sinklng of the coastal manne diatom Thalassiosira weissflogii was studled dunng experiments in a 2 1 m tall water column Under nutnent-replete conditions, T weissflogii grew rapidly in the upper layer of the tank and cells exhibited nearly neutral buoyancy Cells sank however, after depletion of ambient nitrate The growth and sinking of cells were well described by a simple model with nitrate-dependent growth and sinking terms The best fit was obtained by describing the sinking response with a slgmoid functlon ~v h e r e the time scale for increased sinking was 25 h after nitrate depletion Smaller-scale batch culture experiments showed changes that were consistent wlth increased slnking upon depletion of nitrate carbohydrate per m1 of culture increased 2-to 5-fold over 3 5 d , while protein per m1 did not change signif~cantly After re-introduction of nitrate into the medium carbohydrate protein ratios reverted to their onginal values Calculations show that intracellular density and cell sinking rate should change substantially due to fluctuations in carbohydrate and that increased ballast of carbohydrate was sufficient to cause the slnking observed in the tank Changes in the buoyancy of small (15 pm) diatoms such as T weissflogii In response to changes in nutr~ent status have important ecological and biogeochemical implications Nutrient-dependent changes in sinking rates can result in ~ncreased residence time of cells in the mixed layer of the ocean, and In enhanced transport of deep nutnents to the euphotic zone uncoupled from inputs of inorganic carbon

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“…A negative correlation between carbohydrate content and buoyancy has been demonstrated before (e .g . Kromkamp & Mur, 1984 ;Van Rijn & Shilo, 1985 ;Ibelings et al ., 1991b) . Ibelings et al .…”

Section: Introductionmentioning

confidence: 99%

Diurnal buoyancy changes of Microcystis in an artificially mixed storage reservoir

Visser

Ketelaars²,

Breemen³

et al. 1996

Hydrobiologia

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General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. Key words : buoyancy, artificial mixing, aeration, Microcystis, cyanobacteria Abstract In a storage reservoir, which is artificially mixed in order to reduce algal and especially cyanobacterial growth, the cyanobacterium Microcystis is still present . The aim of the research was to investigate why Microcystis was able to grow in the artificially mixed reservoir . From the results it could be concluded that the large shallow area in the reservoir allows this growth . The loss of buoyancy during the day was much higher in this shallow part than in the deep part. Assuming that the loss of buoyancy was the result of a higher carbohydrate content, a higher growth rate in the shallow part may be expected . A higher received light dose by the phytoplankton in the shallow mixed part of the reservoir than in the deep mixed part explains the difference in buoyancy loss . A significant correlation between the received light dose (calculated for homogeneously mixed phytoplankton) and the buoyancy loss was found . Apparently, the Microcystis colonies were entrained in the turbulent flow in both the shallow and the deep part of the reservoir. With a little higher stability on one sampling day, due to the late start of the artificial mixing, the loss of buoyancy at the deep site was higher than on the other days and almost comparable to the loss at the shallow site . Although the vertical biomass distribution and the temperature profiles showed homogeneous mixing, the colonies in the upper layers apparently received a higher light dose than those deeper in the water column . Determination of the buoyancy state of cyanobacteria appeared to be a valuable method to investigate the light history and hence their entrainment in the turbulent flow in the water column .

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Carbohydrate fluctuations, gas vacuolation, and vertical migration of scum‐forming cyanobacteria in fishponds1

Cited by 53 publications

References 19 publications

Diurnal Infection Patterns and Impact of Microcystis Cyanophages in a Japanese Pond

Diurnal Infection Patterns and Impact of Microcystis Cyanophages in a Japanese Pond

Changes in buoyancy and chemical composition during growth of a coastal marine diatom:ecological and biogeochemical consequences

Diurnal buoyancy changes of Microcystis in an artificially mixed storage reservoir

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