Effects of sediment deposition on periphytic biomass, photosynthetic activity and algal community structure

Izagirre, Oihana; Serra, Alexandra; Guasch, Helena; Elosegi, Arturo

doi:10.1016/j.scitotenv.2009.06.049

Cited by 94 publications

(79 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…However, neither did phosphate concentration correlate with chlorophyll a variation despite its limiting levels (Bothwell, 1989), suggesting that other factors result in an overriding effect on PO 4 3-limitation. Epilithic chlorophyll correlated (P < 0.05) positively with pebble + cobble fraction percentage and negatively with sand content and S/P + C, a result that points toward the abundance and diversity of coarse substrates as a factor promoting algal epibenthic colonization (Power and Stewart, 1987) and burial of riverbeds as a cause of depression of algal growth (Izagirre et al, 2009).…”

Section: Discussionmentioning

confidence: 89%

Changes in epilithic diatom communities and periphytic biomass downstream of a reservoir on a Mediterranean river (Calabria region, S Italy)

Gallo¹,

Battegazzore²,

Corapi³

et al. 2015

Turk J Bot

View full text Add to dashboard Cite

Diatom community structure and morphotype classification were studied and periphyton biomass, course particulate organic matter (CPOM), hydrogeomorphological parameters, and nutrient concentrations were measured at 4 stations downstream of the Cecita dam (Mucone River) and at 3 control sites located on different tributaries of the Mucone River in May, August, and November 2005. The lowest values of current velocities and the highest amounts of sand deposition and CPOM accumulation were detected at the stations closest to the dam. Downstream, the confluence with the first permanent tributary (Cerreto River) of the Mucone showed a "rhythral" morphology, similar to that of the control sites. Multivariate analysis showed that the community was constantly segregated into 2 groups: G1 (stations upstream of the Cerreto inflow), dominated by early colonizers, adapted to both high and low current velocity and tolerating burial and light deficiencies; and G2 (all other stations), where the prevailing taxa were species typical of stable environments with high values of flow and abundance of coarse substrates. Genus-based morphotype classification failed to detect any differences between the 2 groups. Biomass levels were higher at station G2 than G1, while accumulation of CPOM downstream of the reservoir promoted fine particulate organic matter production and a switch from autotroph to heterotroph dominated biofilms.

show abstract

Section: Discussionmentioning

confidence: 89%

Changes in epilithic diatom communities and periphytic biomass downstream of a reservoir on a Mediterranean river (Calabria region, S Italy)

Gallo¹,

Battegazzore²,

Corapi³

et al. 2015

Turk J Bot

View full text Add to dashboard Cite

show abstract

“…Cyanobacteria within the order Oscillatoriales (which mainly consisted of a species within the genus Phormidium ) were positively affected by sediment. Cyanobacteria such as Phormidium can be favoured by deposited fine sediment484950, perhaps due to their gliding motility51 or their ability to access micronutrients such as iron in the sediment52.…”

Section: Discussionmentioning

confidence: 99%

High-throughput amplicon sequencing and stream benthic bacteria: identifying the best taxonomic level for multiple-stressor research

Salis

Bruder

Piggott

et al. 2017

Sci Rep

View full text Add to dashboard Cite

Disentangling the individual and interactive effects of multiple stressors on microbial communities is a key challenge to our understanding and management of ecosystems. Advances in molecular techniques allow studying microbial communities in situ and with high taxonomic resolution. However, the taxonomic level which provides the best trade-off between our ability to detect multiple-stressor effects versus the goal of studying entire communities remains unknown. We used outdoor mesocosms simulating small streams to investigate the effects of four agricultural stressors (nutrient enrichment, the nitrification inhibitor dicyandiamide (DCD), fine sediment and flow velocity reduction) on stream bacteria (phyla, orders, genera, and species represented by Operational Taxonomic Units with 97% sequence similarity). Community composition was assessed using amplicon sequencing (16S rRNA gene, V3-V4 region). DCD was the most pervasive stressor, affecting evenness and most abundant taxa, followed by sediment and flow velocity. Stressor pervasiveness was similar across taxonomic levels and lower levels did not perform better in detecting stressor effects. Community coverage decreased from 96% of all sequences for abundant phyla to 28% for species. Order-level responses were generally representative of responses of corresponding genera and species, suggesting that this level may represent the best compromise between stressor sensitivity and coverage of bacterial communities.

show abstract

“…Fine sediment is arguably an important pollution issue for streams, which has been the subject of several reviews (Cordone and Kelley 1961;Newcombe and Macdonald 1991;Waters 1995;Wood and Armitage 1997). These particles are transported by flow, producing elevated turbidity or are deposited on the river bed, leading to effects on biota, from primary producers Izagirre et al 2009) to benthic invertebrates (Suren and Jowett 2001;Larsen and Ormerod 2010) and fish (Galbraith et al 2006;Shaw and Richardson 2001), and ultimately affecting ecosystem processes (Parkhill and Gulliver 2002).…”

Section: Introductionmentioning

confidence: 99%

Fine sediment on leaves: shredder removal of sediment does not enhance fungal colonisation

2011

View full text Add to dashboard Cite

Inorganic fine sediments are easily carried into streams and rivers from disturbed land. These sediments can affect the stream biota, including detritivorous invertebrates (shredders) and impair ecosystem functions, such as leaf litter decomposition. We hypothesized that fine sediment (kaolin) deposited on leaves would reduce or suppress fungal development, reducing decomposition rates of leaves. Moreover, we predicted that shredders would act as ecosystem engineers by perturbing sediment deposition, reducing its impact on decomposition and fungi. We used a fully crossed experimental design of sediment addition (control, 400 mg L -1 ) and shredders (none, Gammarus, Potamophylax) in laboratory aquaria. Leaf mass loss, suspended solids, microbial respiration, fungal biomass and spore production were measured. Sediment addition had no significant effects on the leaf mass remaining nor on shredders' consumption rates. However, sediment slightly reduced fungal assemblage richness and the sporulation rate of three fungal species. The presence of shredders substantially increased the resuspension of fine sediments ([300%), resulting in higher suspended loads. However, the action of shredders did not have a significant effect on fungal biomass nor on leaf mass loss. Even if shredders did not enhance fungal colonisation, they affected the settlement of fine sediment, serving as allogenic engineers. Our study suggests that concentrations of fine sediment of 400 mg L -1 with short exposure times (192 h) can have some effect on leaf decomposition.

show abstract

Effects of sediment deposition on periphytic biomass, photosynthetic activity and algal community structure

Cited by 94 publications

References 27 publications

Changes in epilithic diatom communities and periphytic biomass downstream of a reservoir on a Mediterranean river (Calabria region, S Italy)

Changes in epilithic diatom communities and periphytic biomass downstream of a reservoir on a Mediterranean river (Calabria region, S Italy)

High-throughput amplicon sequencing and stream benthic bacteria: identifying the best taxonomic level for multiple-stressor research

Fine sediment on leaves: shredder removal of sediment does not enhance fungal colonisation

Contact Info

Product

Resources

About