Transport of Algal Cells in Hyporheic Sediments of the River Elbe (Germany)

Kloep, Frank; Röske, I.

doi:10.1002/iroh.200310662

Cited by 8 publications

(9 citation statements)

References 52 publications

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“…suffered little trichome breakage (1 to 2 cells per trichome) and were less likely to be retained by the filtration step than longer trichomed genera. This observation is supported by the findings of Kloep and Röske (2004) in their column filtration study with four green algae. They found that advective interstitial transport through granular medium depended primarily on algal size and morphotype.…”

Section: Accepted Manuscriptsupporting

confidence: 76%

The effect of water treatment unit processes on cyanobacterial trichome integrity

Pestana

Neto

Lawton

et al. 2019

Science of The Total Environment

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Many toxic and/or noxious cyanobacteria appear in nature with a filamentous, stacked cell arrangement called trichomes. Although water treatment can be optimized to keep cyanobacterial cells intact and avoid the release of toxic and/or noxious compounds, many physical and chemical stresses encountered during the treatment process may result in trichome truncation, decreasing treatment efficiency by allowing single cells or short trichomes to reach the product water. This makes it possible for harmful/noxious compounds as well as organic matter to enter the distribution system. Investigations in a pilot and three full-scale water treatment plants were carried out in order to elucidate the degree of trichome truncation across different unit processes. It was found that genera (Pseudanabaena, Planktolyngbya) with short trichomes (<10-12 cells per trichome), are hardly affected by the unit processes (loss of one to four cells respectively), while genera (Planktothrix, Geitlerinema, Dolichospermum) with longer trichomes (30+ cells per trichome) suffer from high degrees of truncation (up to 63, 30, and 56 cells per trichome respectively). The presence of a rigid sheath and/or mucilaginous layer appears to offer some protection from truncation. It was observed that certain unit processes alter the sensitivity or resilience of trichomes to disruption by physical stress. Some genera (Planktothrix, Geitlerinema) were sensitive to pre-oxidation making them more susceptible to shear stress, while Dolichospermum sp. appears more robust after pre-oxidation. While the potential of toxicogenic genera breaking through into the product water is a real danger, in the current study no toxicogenic cyanobacteria were observed.

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Section: Accepted Manuscriptsupporting

confidence: 76%

The effect of water treatment unit processes on cyanobacterial trichome integrity

Pestana

Neto

Lawton

et al. 2019

Science of The Total Environment

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“…Such differences are likely due in part to the spatial differences in near‐bed hydrodynamic conditions observed in the study, which would affect particle resuspension and deposition (Arnon et al, ) and the permeability of sediments (Cooper et al, ; Huettel & Rusch, ). The entry of particles into the interstitial zone is affected by the size of the riverbed sediments, and smaller particles tend to be retained (Karwan & Saiers, ); this is exacerbated by algae, which facilitate particle adhesion and may in turn lower riverbed permeability (Jones et al, ; Kloep & Röske, ). Small spherically shaped algae such as Chlorella enter interstitial pores more readily than algae with complex elongate shapes such as Scenedesmus colonies (Kloep & Röske, ).…”

Section: Discussionmentioning

confidence: 99%

“…The entry of particles into the interstitial zone is affected by the size of the riverbed sediments, and smaller particles tend to be retained (Karwan & Saiers, ); this is exacerbated by algae, which facilitate particle adhesion and may in turn lower riverbed permeability (Jones et al, ; Kloep & Röske, ). Small spherically shaped algae such as Chlorella enter interstitial pores more readily than algae with complex elongate shapes such as Scenedesmus colonies (Kloep & Röske, ). It is likely that some algae enter the streambed in the high flow areas upstream of bedforms as well as in nonbedform areas and are advected in the pore water flow downstream; others are scoured and resuspended due to bed shear stress ( τ ) and transported in the river (Bona et al, ; Boncagni et al, ).…”

Section: Discussionmentioning

confidence: 99%

The Effects of River Algae and Pore Water Flow on the Feeding of Juvenile Mussels

Fung

Ackerman

2020

JGR Biogeosciences

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Juvenile mussels enter the benthos after excysting from a fish host and settling to the bottom where they inhabit the interstitial zone in rivers. We examined the algal composition in the surface water and pore waters in different locations in a temperate river (Thames River) in Southern Ontario. Surprisingly, algal concentration (C) was~9× higher in pore water versus surface water and varied spatially in the riverbed (downstream of boulders > upstream of boulders and nonbedform regions), and pennate diatoms were the most abundant taxon in the pore waters. We examined the clearance rate (CR; mass of suspended material removed from the water per unit time and mussel) of recently metamorphosed juvenile unionid mussels (3-to 4-week-old Lampsilis siliquoidea, Fatmuckets) exposed to pore water and surface water in a paddle wheel flow chamber at different water velocities (U). Juvenile CR based on Chlorophyll a fluorescence was~2× higher on pore water versus surface water and CR based on a specific algal taxon, identified via flow cytometry, varied with its initial concentration. Chesson's feeding electivity index revealed that mussels removed five chlorophyte taxa in proportion to their concentration in the water (i.e., removed at random), but they removed five diatom taxa in greater proportion (i.e., selected for by juvenile mussels) across the range of algal flux (J = UC) examined. This study provides evidence of the importance of diatoms in pore waters to juvenile mussels. It also reveals elements of the physicochemical environment used by juvenile mussels, which should be considered in their conservation.Plain Language Summary Native freshwater mussels are called ecosystem engineers because of their profound influence on water quality, nutrient cycling, and food webs. Juvenile mussels live in the bottom of rivers where they rely on flow within the riverbed (pore water flow) to supply them with algal food and oxygen needed to live. These materials are carried in rivers primarily via water that enters the riverbed in locations such as upstream of boulders; it leaves at other locations, for example, downstream of boulders. We examined the algal composition of the river both in the surface and in the pore water over the summer. Surprisingly, there was much higher algal concentration in the pore water. Juvenile mussels fed at twice the rate on pore waters, and they preferred diatoms (algae that make glass cases and are very productive) over other algae. This was likely because of the high nutritional quality of diatoms. Unfortunately, we also found that the riverbed environment suffered from low oxygen levels and high ammonia levels in the summer, which could be lethal to juvenile mussels. Human-caused changes to environmental conditions that reduce pore water flow and water quality and/or the types of algae present in riverbed could limit the survival and growth of juvenile mussels.

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“…Production of bacteria or algae within the biofilm can then be transferred to biofilmdwelling consumers (Weitere et al, 2005a;Norf et al, 2009a,b). Additionally, planktonic algae can be transferred into sediment interstices, where they may serve as a food source for riverine biofilms (Fischer & Pusch, 2001;Kloep & Roeske, 2004). However, the role of consumers in directly importing organic carbon into the biofilm food web has rarely been considered Kathol et al, 2009).…”

Section: Significant Grazing Impact Of Biofilm-dwelling Consumers On mentioning

confidence: 99%

Contribution of biofilm-dwelling consumers to pelagic-benthic coupling in a large river

2011

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Summary 1. Over the course of this 17‐month study, we assessed the potential loss of plankton (bacteria, algae, heterotrophic flagellates) to consumers (ciliates and rotifers) within mature biofilms established on natural substrata exposed to the main current of the River Rhine (Germany). Once a month, in flow cells in a bypass system to the River Rhine, we measured the clearance rates of the biofilm‐associated consumers on the different groups within the natural plankton. 2. Ciliates were the most dominant consumers, among which planktivorous groups, particularly peritrichs and (in spring and summer) heterotrichs dominated. Consumer biomass varied with season, with the highest density occurring directly after the appearance of the phytoplankton spring peak. 3. Clearance rates on plankton ranged from 96 to 565 L m−2 d−1 for bacteria and 66–749 L m−2 d−1 for algae, with a preference for algae in summer and for bacteria in winter. This pattern coincided with seasonal changes in the structures of the grazer communities. The consumers (both ciliates and rotifers with total standing stocks ranging between 19 and 572 mg C m−2) imported a substantial amount of organic matter (between 15 and 137 mg C m−2 d−1) into the biofilm. 4. These results highlight the potential importance of consumers in the biofilm as a trophic link between the plankton and the benthos, a function that has hitherto mostly been attributed to filter‐feeding bivalves. In contrast to bivalves, the biofilm‐dwelling consumers show a more dynamic response towards the plankton density and composition. Such dynamic components need to be considered when estimating total plankton consumption by the benthos.

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Transport of Algal Cells in Hyporheic Sediments of the River Elbe (Germany)

Cited by 8 publications

References 52 publications

The effect of water treatment unit processes on cyanobacterial trichome integrity

The effect of water treatment unit processes on cyanobacterial trichome integrity

The Effects of River Algae and Pore Water Flow on the Feeding of Juvenile Mussels

Contribution of biofilm-dwelling consumers to pelagic-benthic coupling in a large river

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