Seasonal and spatial distribution of ciliates in the sandy hyporheic zone of a lowland stream

Cleven, Ernst‐Josef

doi:10.1016/j.ejop.2003.11.002

Cited by 24 publications

(37 citation statements)

References 40 publications

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“…The same ciliate taxa were present in both the benthic and hyporheic zone (Cleven 2004a); thus, hereafter we use the terms ciliates, benthic ciliates and interstitial ciliates synonymously.…”

Section: Methodsmentioning

confidence: 99%

“…The investigation was conducted on 3 days (Days 0, 21 and 35) in October to November 2002, as a previous study at the same site had shown highest hyporheic ciliate abundance at this time (Cleven 2004a). The investigation area was an 845 m long section of the Ladberger Mühlenbach divided into 169 patches of 20 m 2 each.…”

Section: Methodsmentioning

confidence: 99%

“…Staining protocol, enumeration and identification followed the descriptions given in Cleven (2004a). The cell biomass of identified species was estimated according to Foissner et al (1995), assuming that 1 pg fresh weight equals 1 µm 3 biovolume (Finlay 1982).…”

Section: Methodsmentioning

confidence: 99%

“…After a settling time of 48 h, the new supernatant was pipetted off with the exception of a few milliliters extract. To separate cells from detritus, a subsample of 2 ml of the extract was purified by isopycnic centrifugation using Percoll following the protocol of Cleven (2004a).…”

Section: Methodsmentioning

confidence: 99%

“…We modified this dilution technique (originally developed for plankton studies) for use in the interstitial habitat. The study was conducted in October to November 2002, as the highest number of ciliates (necessary for the success of a growth study) is found at this time of year (Cleven 2004a).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Growth of interstitial ciliates in association with ciliate bacterivory in a sandy hyporheic zone

Cleven¹,

Königs²

2007

Aquat. Microb. Ecol.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Growth of interstitial ciliates in association with ciliate bacterivory in a sandy hyporheic zone

Cleven¹,

Königs²

2007

Aquat. Microb. Ecol.

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Complexity of river ciliate communities at a national park highlights the need for microbial conservation

Quintela‐Alonso

Pérez-Uz

Sánchez‐Jiménez

et al. 2017

Aquatic Conservation

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Microorganisms play pivotal roles in aquatic ecosystems. Free‐living protists are the main components of the eukaryotic microbial communities at the base of freshwater ecosystems. Ciliate grazing channels a large proportion of organic matter into multicellular organisms. Surprisingly, ciliates and other microorganisms are neglected in global conservation schemes. Interstitial ciliates were sampled in three sites of varying human pressure on the River Manzanares (La Pedriza National Park, Spain). Abundances of trophic groups and species were adjusted to a generalized linear model (GLM Poisson regression). Ciliate communities were rich in species (74 morphotypes) and although traditional microscopy retrieved a high number of species that appeared only once or in low numbers, rarefaction analyses estimated much larger species richness. These results illustrate that rarefaction assays are a useful first step for exploring the extent of the ciliate cryptic diversity in freshwater ecosystems. Benthic ciliate communities changed significantly, both spatially and at a short temporal scale. The fluctuating nature of the community was manifested by the presence of many ephemeral species at the same river site, revealing a complex and transient community structure. No significant short‐term changes were observed in the physical–chemical properties. Therefore, even slight differences in the abiotic variables may cause rapid shifts of ciliate species. Overall, human pressure had an effect on the interstitial (or benthic) ciliates that resulted in a reduction of species richness and their abundance.

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Large‐scale patterns of biofilm‐dwelling ciliate communities in a river network: Only small effects of stream order

Ritz

Eßer

Arndt

et al. 2017

Internat Rev Hydrobiol

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Although biofilm‐dwelling microfauna (i.e., small metazoans and protzoans) can play an important role in the flux of matter in running waters, their dynamics, and control within stream networks are as yet poorly understood. Here, we analyzed the longitudinal (from first order stream to large river) dynamics of ciliates associated to hard substrate within a river network. Both ciliate abundance and their taxonomical community structure showed no correlations to stream order, although the community structure of the largest river, the Rhine, differed from those of the other rivers. The abundances of biofilm‐dwelling bacteria, algae, rotifers, and nematodes also showed no correlation with stream order. The above results contrast to the abundances of planktonic algae and bacteria that were significantly and positively correlated with the stream order. The results showed that stream size and the corresponding planktonic resource concentration are not reliable parameters in predicting the abundances and community structures of biofilm‐dwelling ciliates. In fact, local parameters seemed to have stronger effects on benthic microfauna communities. Thus, the impact of small‐scale habitat patterns needs further attention in explaining the community structure of biofilm‐dwelling ciliates.

show abstract

Seasonal and spatial distribution of ciliates in the sandy hyporheic zone of a lowland stream

Cited by 24 publications

References 40 publications

Growth of interstitial ciliates in association with ciliate bacterivory in a sandy hyporheic zone

Growth of interstitial ciliates in association with ciliate bacterivory in a sandy hyporheic zone

Complexity of river ciliate communities at a national park highlights the need for microbial conservation

Large‐scale patterns of biofilm‐dwelling ciliate communities in a river network: Only small effects of stream order

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