Effects of Salinity, Light and Time on the Vertical Migration of Diatom Assemblages

Sauer, Julia L.; Wenderoth, Klaus; Maier, Uwe G.; Rhiel, Erhard

doi:10.1080/0269249x.2002.9705538

Cited by 32 publications

(33 citation statements)

References 17 publications

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“…This seems to have happened with viable MPB seeking refuge in deeper layers and returning to the surface on rewetting. Diatoms are known to migrate deeper in response to temperature and light stress (Underwood, 2002), whereas salinities above 35 have led to fewer cells migrating vertically (Sauer et al, 2002) with cessation of motility observed at high salinity (140) (Apoya-Horton et al, 2006). We conclude that as the sediment surface dried to a critical point, the benthic diatoms ceased their upwards migration and remained at depth in the sediment.…”

Section: Desiccation Stress Causes Microbial Behavioural Changes and mentioning

confidence: 99%

Resistance and resilience of benthic biofilm communities from a temperate saltmarsh to desiccation and rewetting

et al. 2010

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Periods of desiccation and rewetting are regular, yet stressful events encountered by saltmarsh microbial communities. To examine the resistance and resilience of microbial biofilms to such stresses, sediments from saltmarsh creeks were allowed to desiccate for 23 days, followed by rewetting for 4 days, whereas control sediments were maintained under a natural tidal cycle. In the top 2 mm of the dry sediments, salinity increased steadily from 36 to 231 over 23 days, and returned to seawater salinity on rewetting. After 3 days, desiccated sediments had a lower chlorophyll a (Chl a) fluorescence signal as benthic diatoms ceased to migrate to the surface, with a recovery in cell migration and Chl a fluorescence on rewetting. Extracellular b-glucosidase and aminopeptidase activities decreased within the first week of drying, but increased sharply on rewetting. The bacterial community in the desiccating sediment changed significantly from the controls after 14 days of desiccation (salinity 144). Rewetting did not cause a return to the original community composition, but led to a further change. Pyrosequencing analysis of 16S rRNA genes amplified from the sediment revealed diverse microbial responses, for example desiccation enabled haloversatile Marinobacter species to increase their relative abundance, and thus take advantage of rewetting to grow rapidly and dominate the community. A temporal sequence of effects of desiccation and rewetting were thus observed, but the most notable feature was the overall resistance and resilience of the microbial community.

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Section: Desiccation Stress Causes Microbial Behavioural Changes and mentioning

confidence: 99%

Resistance and resilience of benthic biofilm communities from a temperate saltmarsh to desiccation and rewetting

et al. 2010

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“…Cell densities on the surfaces of large sediment areas within the Petri dishes were examined using epifluorescence light microscopy as described by Sauer et al (2002). At least 30 pictures were taken per Petri dish and stored as digitized files on a personal computer.…”

Section: Fluorescence Microscopymentioning

confidence: 99%

“…Low tides were at 05:00 and 17:08 and high tides at 11:01 and 23:30 hours. Sampling was performed as described by Sauer et al (2002). After transfer to the laboratory, the Petri dishes were stored at 20C under a 12:12 h low white light: dark regime (photon-fluence rate10 mol m 2 s 1 during the light phase provided by Osram L36/32 Luminux Warmton fluorescence tubes in combination with Osram L36/16 Tageslicht fluorescence tubes) in a laboratory tidal micro-ecosystem for up to 21 days.…”

Section: Field Site and Sampling Conditionsmentioning

confidence: 99%

“…Measurements of the photon-fluence rates and statistical analyses (t test) were performed as described by Sauer et al (2002).…”

Section: Light Measurements and Statistical Analysesmentioning

confidence: 99%

“…Harper 1969;Happey-Wood and Jones 1988). In addition to the endogenous rhythm, light intensity and salinity are shown to have a great impact on the vertical migration (Paterson 1986;Sauer et al 2002). The impacts of light quality and of the availability or lack of air or defined gases have not been investigated in de-tail.…”

Section: Introductionmentioning

confidence: 99%

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Influence of light quality and gassing on the vertical migration of diatoms inhabiting the Wadden Sea

Wenderoth

Rhiel

2004

Helgol Mar Res

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Diatoms inhabiting the Wadden Sea show a rhythmic migration pattern, which is superimposed by the tidal rhythm. In addition to light intensity, light quality has a pronounced influence on the upward-directed migration, thus giving some information on the nature of the relevant photoreceptors. Maximum diatom migration occurred when sediment surfaces were illuminated with blue light. The cell densities in blue light exceeded those of white light control experiments 1.8-fold. Furthermore, we registered a minor peak in the red light region, which reached approximately 60% of the white light controls. Cryptochrome and/or phototropin may thus be involved and act as photoreceptors for the vertical migration pattern. Flushing sediment surfaces of freshly mixed Wadden Sea sediments with air, O 2 , CO 2 or N 2 did not show a significant influence of O 2 on the upward migration. The disappearance of diatoms from sediment surfaces which were flushed with CO 2 is most probably caused by the acidification of the sediment bed.

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Diatom Motility: Mechanisms, Control and Adaptive Value

Serôdio

2021

Diatom Gliding Motility

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Effects of Salinity, Light and Time on the Vertical Migration of Diatom Assemblages

Cited by 32 publications

References 17 publications

Resistance and resilience of benthic biofilm communities from a temperate saltmarsh to desiccation and rewetting

Resistance and resilience of benthic biofilm communities from a temperate saltmarsh to desiccation and rewetting

Influence of light quality and gassing on the vertical migration of diatoms inhabiting the Wadden Sea

Diatom Motility: Mechanisms, Control and Adaptive Value

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