The Tidal Rhythm of the Diatom Hantzschia Amphioxys

Fauré‐Fremiet, E.

doi:10.2307/1538527

Cited by 61 publications

(27 citation statements)

References 6 publications

(8 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Also, the highly precise solar and lunar rhythmicity that synchronizes gamete liberation in certain of the marine algae (e.g., Dictyota) even when directly shielded from normal full daylight or moonlight would appear to require time-measuring mechanisms of considerable accuracy to serve as insurance mechanisms for unusual meteorological conditions. There is some evidence that diatoms do possess such lunar biological clocks (14). These clocks could normally maintain the frequency of the cosmic cycles by such a mechanism as is described in this report.…”

Section: Resultssupporting

confidence: 54%

Persistent Rhythms of O₂-Consumption in Potatoes, Carrots and the Seaweed, Fucus.

Brown¹,

Freeland²,

Ralph³

1955

Plant Physiol.

View full text Add to dashboard Cite

Section: Resultssupporting

confidence: 54%

Persistent Rhythms of O₂-Consumption in Potatoes, Carrots and the Seaweed, Fucus.

Brown¹,

Freeland²,

Ralph³

1955

Plant Physiol.

View full text Add to dashboard Cite

“…Fauré-Fremiet 1951, Palmer 1960, Perkins 1960, Hopkins 1963, Round & Palmer 1966, Robak & Kühl 1997, Kingston 1999. The diatoms reach their maximal concentration on the sediment surface during daytime emersions and begin to dip into the sediment with the rising tide, reaching a maximal concentration in the aphotic zone at night (Fig.…”

Section: Discussionmentioning

confidence: 97%

“…Benthic microalgae reach the surface of the sediment during a daytime emersion period and bury themselves deeper into sediment layers with the receding tide and/or the onset of night (e.g. Fauré-Fremiet 1951, Ganaparti et al 1959, Perkins 1960, Palmer & Round 1967, Paterson & Underwood 1990, Robak & Kühl 1997, Kingston 1999. Fluctuations in photosynthetic rate, production and concentration of chlorophyll a in the surface layer of the soft sediment coincide with the phases of tidal and day:night cycles (Marshall et al 1971, Brown et al 1972, Raiux-Gobin 1985, Guarini et al 2000, Serôdio & Catarino 2000.…”

Section: Introductionmentioning

confidence: 99%

Diatom activity within soft sediments: behavioural and physiological processes

Saburova¹,

Polikarpov²

2003

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

An investigation of vertical distribution, rhythms of vertical migration and division of epipelic free-living diatom algae was carried out at different sediment depths on intertidal sandflat in the Chernaya River Estuary (Kandalaksha Gulf, White Sea, Russia) during the summers of 1994-2001. The depth of penetration of viable microalgae cells in the sediment did not exceed 4.2 cm in the areas with clay sublayers, where zones with high negative Eh values were located closer to the surface. Diatom habitats in the areas with coarse sand sublayers extended to more than 8 cm depth. Approximately 40% of diatoms were present in the topmost 2 mm layer. The subsurface portion of diatom cells on average was concentrated within the layer with Eh values ranging from 0 to -80 mV. Eh values below -100 mV limited diatom penetration in deep anoxic sediment layers. The deep portion of diatom populations consisted basically of dividing cells. A cytological analysis of diatom cell distribution showed that the proportion of cells in the different phases of mitosis increased with increasing depth, and reached 80 to 90% at a depth of 2 to 3 cm. The regular presence of dividing diatom cells almost exclusively in aphotic anoxic sediments was noted first. The study of the dynamics of microphytobenthic vertical distribution revealed active diurnal vertical migration depending on temperature, light and tide regimes. The frequency of doublet cells (FDC) in epipelic diatom populations was in inverse proportion to cell concentrations in the photic zone. Diatom division was registered only during incubation in the porewater, which was rich in inorganic nutrients and dissolved organic matter. We suppose that a more stable habitat with higher concentrations of nutrients (especially nitrogen) in their more reduced forms (NH 4 + instead of NO 3 -) provides more favourable conditions for cell growth and division at the depth of several cm within the sediment compared, to the surface layer. Migration activity of diatom algae is an adaptation which permits cells to consume energy and to undergo fission under optimum conditions in spatially disconnected zones. KEY WORDS: Epipelic diatoms · Vertical distribution · Vertical migration · Cell cycle · Intertidal sandflatResale or republication not permitted without written consent of the publisher

show abstract

“…Small-scale patchiness in distribution of MPB has often been reported in the literature (e.g. Faure-Fremiet 1951, MacIntyre et al 1996. Surveys of the spatial distributions of MPB among estuaries have shown that their small-scale distributions are also very variable from one location to another (Guarini et al 1998, Defew et al 2002, i.e.…”

Section: Introductionmentioning

confidence: 83%

Spatial variation of chlorophyll on estuarine mudflats determined by field-based remote sensing

Murphy¹,

Tolhurst²,

Chapman³

et al. 2008

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

We present an approach to field-based remote sensing of the spatial variation of chlorophyll (as an index of microphytobenthic biomass) in intertidal soft sediments using digital colourinfrared imagery. Variation in amounts of chlorophyll a was quantified from small (cm) to large (100 m) scales within a single tidal cycle, using levels of replication and resolution that would be difficult to achieve using conventional sampling strategies. Eight scales of interest were selected: 100, 50, 2 and 1 m, and 40, 8, 4 and < 2 cm. These scales have been associated with variability in chlorophyll in previous studies. The fully hierarchical design allowed spatial variance to be estimated independently at each chosen spatial scale. Data were collected along 2 replicate transects at 2 locations within each of 2 different estuaries. A strong linear relationship was found between measured chlorophyll and image estimates of chlorophyll. Replicate transects in 2 of the 4 locations showed similar patterns of variability across spatial scales. Relatively large amounts of variability were found at the smallest spatial scales (4 and < 2 cm) and at the 40 cm scale, but the 8 cm scale was an unimportant source of variation. At some scales, transects gave similar results, providing generality to the conclusions reached. At other scales, transects gave quite different results, drawing attention to problems of inferring ecological processes when there are only single sets of data. Large differences in variability were also found from location to location. These patterns suggest that spatial variability is governed by complex interactions between fauna, microflora and sediment.

show abstract

The Tidal Rhythm of the Diatom Hantzschia Amphioxys

Cited by 61 publications

References 6 publications

Persistent Rhythms of O₂-Consumption in Potatoes, Carrots and the Seaweed, Fucus.

Persistent Rhythms of O₂-Consumption in Potatoes, Carrots and the Seaweed, Fucus.

Diatom activity within soft sediments: behavioural and physiological processes

Spatial variation of chlorophyll on estuarine mudflats determined by field-based remote sensing

Contact Info

Product

Resources

About

The Tidal Rhythm of the Diatom Hantzschia Amphioxys

Cited by 61 publications

References 6 publications

Persistent Rhythms of O2-Consumption in Potatoes, Carrots and the Seaweed, Fucus.

Persistent Rhythms of O2-Consumption in Potatoes, Carrots and the Seaweed, Fucus.

Diatom activity within soft sediments: behavioural and physiological processes

Spatial variation of chlorophyll on estuarine mudflats determined by field-based remote sensing

Contact Info

Product

Resources

About

Persistent Rhythms of O₂-Consumption in Potatoes, Carrots and the Seaweed, Fucus.

Persistent Rhythms of O₂-Consumption in Potatoes, Carrots and the Seaweed, Fucus.