The role of fungi in the nutrition of stream invertebrates

Bärlocher, Feli×

doi:10.1111/j.1095-8339.1985.tb01137.x

Cited by 249 publications

(163 citation statements)

References 54 publications

Supporting

Mentioning

154

Contrasting

Order By: Relevance

“…This is in line with previous studies (Rong et al, 1995 andZubrod et al, 2015b) that observed no significant correlations between leaf ergosterol contents and consumption by shredding invertebrates. Conversely, Bärlocher (1985) reported strong relationships between leaf nutritional quality (characterized by nitrogen-rich fungal biomass accumulation) and invertebrate feeding, in accordance with the concept of compensatory feeding (i.e., an increase in leaf consumption by shredders to fulfill their energetic requirements despite the lower quality food on offer). Here, invertebrate Gammarus feeding rates followed complex patterns according to litter decomposition stage ( Fig.…”

Section: Drought and Tbz Stress Effects Along The Aquatic Detrital Fosupporting

confidence: 67%

Combined effects of drought and the fungicide tebuconazole on aquatic leaf litter decomposition

et al. 2016

View full text Add to dashboard Cite

Highlights• The combined effects of drought and the fungicide tebuconazole on aquatic leaf litter decomposition (LLD) were assessed.• TBZ applied alone had no significant effect on LLD.• Drought strongly impacted the microbial LLD process and led to cascading effects on Gammarus feeding.• Structural and functional effects increased when drought and TBZ were applied simultaneously. AbstractLoss of biodiversity and altered ecosystem functioning are driven by the cumulative effects of multiple natural and anthropogenic stressors affecting both quantity and quality of water resources. Here we performed a 40-day laboratory microcosm experiment to assess the individual and combined effects of drought and the model fungicide tebuconazole (TBZ) on leaf litter decomposition (LLD), a fundamental biogeochemical process in freshwater ecosystems. Starting out from a worst-case scenario perspective, leaf-associated microbial communities were exposed to severe drought conditions (four 5-day drought periods alternated with 4-day immersion periods) and/or a chronic exposure to TBZ (nominal concentration of 20 µg L−1). We assessed the direct effects of drought and fungicide on the structure (biomass, diversity) and activity (extracellular enzymatic potential) of fungal and bacterial assemblages colonizing leaves. We also investigated indirect effects on the feeding rates of the amphipod Gammarus fossarum on leaves previously exposed to drought and/or TBZ contamination. Results indicate a stronger effect of drought stress than fungicide contamination under the experimental conditions applied. Indeed, the drought stress strongly impacted microbial community structure and activities, inhibiting the LLD process and leading to cascading effects on macroinvertebrate feeding. However, despite the lack of significant effect of TBZ applied alone, the effects of drought on microbial functions (i.e., decrease in LLD and in enzymatic activities) and on Gammarus feeding rates were more pronounced when drought and TBZ stresses were applied together. In a perspective of ecological risk assessment and ecosystem management for sustainability, these findings stress the need for deeper insight into how multiple stressors can affect the functioning of aquatic ecosystems and associated services.

show abstract

Section: Drought and Tbz Stress Effects Along The Aquatic Detrital Fosupporting

confidence: 67%

Combined effects of drought and the fungicide tebuconazole on aquatic leaf litter decomposition

et al. 2016

View full text Add to dashboard Cite

show abstract

“…As seen in earlier studies, the present study also reveals increase in leaf nitrogen (corroborates studies by Bärlocher 1985, Webster & Benfield 1986 and decrease in leaf phosphorus and leaf phenolics. The nitrogen elevation was highest in Kaiga stream and Kadra dam during post-monsoon season coinciding with high species richness, conidial output and diversity especially in banyan leaf (see Table 3, 5).…”

Section: Discussionsupporting

confidence: 93%

Colonization and diversity of aquatic hyphomycetes in relation to decomposition of submerged leaf litter in River Kali (Western Ghats, India)

Sudheep¹

2013

Mycosphere

View full text Add to dashboard Cite

Sudheep NM, Sridhar KR 2013 -Colonization and diversity of aquatic hyphomycetes in relation to decomposition of submerged leaf litter in River Kali (Western Ghats, India). Mycosphere 4(3), 456-476, Doi 10.5943/mycosphere/4/3/3 AbstractDynamics of leaf chemistry, quantitative studies and decomposition of leaves by aquatic hyphomycetes in the Western Ghats is investigated in this paper. A total of 28 species (range, 19-28 spp.) of aquatic hyphomycetes were recovered from natural and submerged (banyan and cashew) leaf litter in Kaiga stream and Kadra dam of the Western Ghats over three seasons (monsoon, post-monsoon and summer) in 12 months of 2008-09. Higher species richness and conidial output was seen during the post-monsoon season and this corroborates with earlier studies. Among the top six species, five were common in different locations of the Western Ghats (Anguillospora longissima, Flagellospora curvula, Lunulospora curvula, Triscelophorus acuminatus and T. monosporus). Among the 12 less frequent species, seven also occurred in low frequency in other locations of the Western Ghats (Clavariopsis aquatica, Dwayaangam cornuta, Flabellospora crassa, F. multiradiata, Ingoldiella hamata, Nawawia filiformis and Tricladium sp.). Leaf litter decomposition resulted in elevation of nitrogen and decrease in phosphorus and total phenolics. Cellulase was higher in banyan than cashew leaves compared to xylanase and pectinase in stream and dam locations. The enzyme activity peaked within one or two weeks and subsequently remained steady with a few exceptions coinciding with increase in total nitrogen, decrease in total phenolics and leaf mass loss. Banyan and cashew leaf litter in Kaiga stream and Kadra dam falls in the slow decomposing category over three seasons (k, 0.0030-0.00.0050). Decomposition of banyan leaves (k, 0.0037-0.0050) was faster than cashew leaves (k, 0.0030-0.0043) in stream as well as dam sites. This was reflected in changes in leaf chemistry (slow decrease of organic carbon, phosphorus, phenolics and gradual increase in nitrogen), low enzyme activity (xylanase and pectinase), low fungal richness, conidial output and fungal diversity in dam location. Leaf mass of banyan and cashew was positively correlated with organic carbon, phosphorus and total phenolics, while negatively correlated with nitrogen and enzyme activity. Negative correlation between phenolics and enzymes reveals that the mass loss was dependent on the quantity and extent of leaching of phenolics. Overall, the assemblage of aquatic hyphomycetes on leaf litter in Kaiga stream and Kadra dam imitates other locations of the Western Ghats with variations in dynamics of leaf chemistry, decomposition and mass loss.

show abstract

“…This allochthonous material is colonised by aquatic fungi and bacteria and subsequently by stream macroinvertebrates, particularly those from the functional feeding group described as shredders (Bärlocher, 1985;Cummins et al, 1989;Webster and Benfield, 1986). The rate at which these stream biota process the leaves is influenced by many factors such as stream chemistry and water temperature (Kaushik and Hynes, 1971).…”

Section: Introductionmentioning

confidence: 99%

Processing of pine (Pinus sylvestris) and birch (Betula pubescens) leaf material in a small river system in the northern Cairngorms, Scotland

Collen

Keay

Morrison

2004

Hydrol. Earth Syst. Sci.

View full text Add to dashboard Cite

Processing rates, and macroinvertebrate colonisation, of pine needles and birch leaves were studied at eight sites on the river Nethy, a small river system in the Cairngorm region of north-eastern Scotland. Throughout this river system, processing rates were slow for pine (k values 0.0015-0.0034 day -1 ) and medium to fast for birch (k values 0.0085-0.0331 day -1 ). Plecopteran shredders dominated both pine and birch leaf packs during the early part of the experiment while chironomids were more important in the latter stages. It is suggested that the slow processing rate of pine needles could adversely affect the productivity of streams, particularly where needles provide the major allochthonous energy source and retentive features are limited. Forest managers should consider this when creating new pinewoods in treeless areas as it will take many years for the trees to reach a size at which they can effectively contribute retentive features, in the form of woody debris, to streams.

show abstract

The role of fungi in the nutrition of stream invertebrates

Cited by 249 publications

References 54 publications

Combined effects of drought and the fungicide tebuconazole on aquatic leaf litter decomposition

Combined effects of drought and the fungicide tebuconazole on aquatic leaf litter decomposition

Colonization and diversity of aquatic hyphomycetes in relation to decomposition of submerged leaf litter in River Kali (Western Ghats, India)

Processing of pine (Pinus sylvestris) and birch (Betula pubescens) leaf material in a small river system in the northern Cairngorms, Scotland

Contact Info

Product

Resources

About