Changes in dominance among species in aquatic hyphomycete assemblages do not affect litter decomposition rates

Ferreira, Verónica; Chauvet, Éric

doi:10.3354/ame01556

Cited by 21 publications

(18 citation statements)

References 72 publications

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“…Some studies here suggested that high fungal diversity increases the litter decomposition efficiency (Duarte et al, 2006;Costantini and Rossi, 2010;Pascoal et al, 2010), while others have shown no such relationship (i.e. Dang et al, 2005;Ferreira and Chauvet, 2012;Geraldes et al, 2012). These studies have typically been performed under constant conditions.…”

Section: Introductionmentioning

confidence: 90%

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Is diversity a buffer against environmental temperature fluctuations? – A decomposition experiment with aquatic fungi

2015

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Section: Introductionmentioning

confidence: 90%

“…metabolic rates, physiological stress) and/or indirectly (e.g. species interactions and distributions) affected by the water temperature (Friberg et al, 2009;Madigan et al, 2009;Woodward et al, 2010a,b;Bergfur and Friberg, 2012).…”

Section: Degradative Differences Among Speciesmentioning

confidence: 98%

Is diversity a buffer against environmental temperature fluctuations? – A decomposition experiment with aquatic fungi

2015

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“…Our study contrasts with other studies suggesting functional redundancy among aquatic hyphomycete assemblages (Bärlocher & Graça, ; Pascoal, Cássio & Marvanová, ; Ferreira, Gulis & Graça, ; Ferreira & Chauvet, ). Conversely, they agree with studies that have demonstrated the important role played by the identity of dominant species in the relationship between community evenness and ecosystem processes (McKie et al ., ; Gonçalves & Canhoto, ; Swan, Gluth & Horne, ).…”

Section: Discussionmentioning

confidence: 99%

“…Eight microcosms were inoculated with an assemblage composed of aquatic hyphomycete species tending to be early colonisers (Early assemblage: Anguillospora , Tetrachaetum and Tricladium ), and eight microcosms were inoculated with an assemblage composed of aquatic hyphomycete species tending to be late colonisers (Late assemblage: Articulospora , Clavariopsis and Tetracladium ) (Gessner et al ., ; Nikolcheva, Cockshutt & Bärlocher, ). The use of only three species allowed us to assess the importance of the dominant species identity on the decomposition process (Ferreira & Chauvet, ) and, more specifically, the extent to which this affected the food quality of leaf detritus. For each assemblage type (Early and Late), there were four dominance treatments: an even treatment, in which microcosms were inoculated with even proportions of conidia from each species (i.e.…”

Section: Methodsmentioning

confidence: 99%

Fungal alteration of the elemental composition of leaf litter affects shredder feeding activity

et al. 2015

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1. Leaf litter from riparian vegetation provides the main source of matter and energy for food webs of small forest streams. Shredding macroinvertebrates mostly feed on this litter when it has been colonised and conditioned by microorganisms, especially by aquatic hyphomycetes. Since shredders feed selectively, they must make foraging decisions based on the physical and chemical characteristics of the food resource, which can change depending on the identity of fungal species. 2. Here, we addressed the effect of changes in fungal assemblage structure on the elemental composition of oak (Quercus robur) leaf litter and how variation in litter quality affects the feeding of a stream shredder. Leaf discs were incubated in microcosms for 2 weeks, inoculated with various fungal assemblages comprised of three species each, and offered to a shredder (Schizopelex festiva, Trichoptera: Sericostomatidae) as food. 3. This shredder ate more leaves with a high mycelial biomass, which depended on fungal assemblage composition. Leaf litter conditioned by different fungal assemblages resulted in different litter N and P concentrations. Mycelial biomass was positively related to litter P concentration, with the lowest and highest P concentrations differing by 40% at most, but not to litter N concentration, even though the lowest and highest N concentrations differed by as much as 35%. The caddisfly larvae ate more leaves with a low C/P ratio. 4. These findings suggest a key role of litter P concentration in eliciting fungal conditioning effects on shredder-mediated litter decomposition.

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“…In contrast to bacteria, fungal community structure still differed among preconditioned leaves even at later stages of in‐stream decomposition, pointing to a certain level of maintenance of the initial community (Sridhar et al ., ). However, similar mass loss rates were observed for differing fungal communities (Sridhar et al ., ; Ferreira & Chauvet, ), implying that a change in fungal community does not necessarily change functionality. Therefore, it seems likely that growth of the fungal community was indeed inhibited by the anoxic preconditioning.…”

Section: Discussionmentioning

confidence: 99%

Preconditioning of leaves by solar radiation and anoxia affects microbial colonisation and rate of leaf mass loss in an intermittent stream

et al. 2013

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Summary Seasonal flow intermittence in streams often coincides with early leaf abscission of riparian vegetation due to water stress. When accumulated on dry stream beds or in remaining pools, leaves are exposed to solar radiation or fermentation processes, respectively. However, very little information exists on how these preconditioning processes could affect leaf decomposition when stream flow has recovered. We simulated natural preconditioning of leaves by irradiation with UV‐VIS fluorescent lamps and incubation under anoxic conditions. Mass loss rates of preconditioned leaf litter from deciduous trees (Alnus glutinosa, Fraxinus excelsior, Populus tremula and Quercus petreae) were quantified in a temporary stream during base flow conditions. Coarse and fine mesh litter bags were used to study the effect of benthic macroinvertebrates and microorganisms on leaf mass loss. Preconditioning reduced the concentration of macronutrients such as P, K and Mg and increased the relative cellulose content of the leaves. Preconditioning changed the fungal community structure (analysed by DGGE) depending on leaf species and sampling date. Preconditioning in anoxic conditions also suppressed fungal decomposer biomass (measured as ergosterol) by 42% resulting in 33% lower mass loss rates in fine mesh bags. In contrast, mass loss rates were not affected by preconditioning when macroinvertebrate decomposers had access to the leaf litter. In streams exhibiting seasonal flow intermittence, preconditioning will influence organic carbon dynamics towards lower rates of microbially mediated turnover and towards poorer quality of downstream‐transported material.

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Changes in dominance among species in aquatic hyphomycete assemblages do not affect litter decomposition rates

Cited by 21 publications

References 72 publications

Is diversity a buffer against environmental temperature fluctuations? – A decomposition experiment with aquatic fungi

Is diversity a buffer against environmental temperature fluctuations? – A decomposition experiment with aquatic fungi

Fungal alteration of the elemental composition of leaf litter affects shredder feeding activity

Preconditioning of leaves by solar radiation and anoxia affects microbial colonisation and rate of leaf mass loss in an intermittent stream

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