Structural and functional measures of leaf-associated invertebrates and fungi as predictors of stream eutrophication

Pereira, Ana Sofia; Geraldes, Paulo; Lima-Fernandes, Eva; Fernandes, Isabel Rodrigues; Cássio, Fernanda; Pascoal, Cláudia

doi:10.1016/j.ecolind.2016.05.017

Cited by 36 publications

(35 citation statements)

References 42 publications

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“…Biofilms are frequently formed on the surfaces of stone, leaf litter, submerged wood, sediment, and plants within rivers. Biofilm fungal communities can play key roles in the decomposition of submerged organic matter in streams and are important in ecosystem functioning (Pereira et al, 2016). The supply of organic matter and nutrients, as well as biological interactions, can greatly shape biofilm fungal community composition (Suberkropp, 1991; Miura and Urabe, 2017).…”

Section: Discussionmentioning

confidence: 99%

Fungal Community as a Bioindicator to Reflect Anthropogenic Activities in a River Ecosystem

et al. 2018

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The fungal community interacts with the ambient environment and can be used as a bioindicator to reflect anthropogenic activities in aquatic ecosystems. Several studies have investigated the impact of anthropogenic activities on the fungal community and found that community diversity and composition are influenced by such activities. Here we combined chemical analysis of water properties and sequencing of fungal internal transcribed spacer regions to explore the relationship between water quality indices and fungal community diversity and composition in three river ecosystem areas along a gradient of anthropogenic disturbance (i.e., less-disturbed mountainous area, wastewater-discharge urban area, and pesticide and fertilizer used agricultural area). Results revealed that the level of anthropogenic activity was strongly correlated to water quality and mycoplankton community. The increase in organic carbon and nitrogen concentrations in water improved the relative abundance of Schizosaccharomyces, which could be used as a potential biomarker to reflect pollutant and nutrient discharge. We further applied a biofilm reactor using water from the three areas as influent to investigate the differences in fungal communities in the formed biofilms. Different community compositions were observed among the three areas, with the dominant fungal phyla in the biofilms found to be more sensitive to seasonal effects than those found in water. Finally, we determined whether the fungal community could recover following water quality restoration. Our biofilm reactor assay revealed that the recovery of fungal community would occur but need a long period of time. Thus, this study highlights the importance of preserving the original natural aquatic ecosystem.

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Section: Discussionmentioning

confidence: 99%

Fungal Community as a Bioindicator to Reflect Anthropogenic Activities in a River Ecosystem

et al. 2018

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“…Although we focused on our study in microbial‐mediated leaf decomposition, the mesh bags used allow the entrance of small invertebrates that may have also contributed to the loss of mass from leaves. Based on previous studies (Lima‐Fernandes et al ., ; Pereira et al ., 2016, 2017) and the visual inspection of our leaf bags through our experiment, invertebrate communities were dominated by taxa belonging to Trichoptera, Plecoptera and Ephemeroptera in the Oliveira stream (Lima‐Fernandes et al ., ; Pereira et al ., ), while in the Este River, invertebrate communities were dominated by Oligochaeta and Chironomidae (personal observations of the authors). Thus, the differences in invertebrate communities may have also contributed to the differences found on leaf decomposition rates between streams.…”

Section: Discussionmentioning

confidence: 99%

“…However, streams can originally, or by human alteration, differ in several environmental characteristics known to have an influence on the structure and activity of microbial communities (Pascoal and Cássio, ; Pascoal et al ., ; Duarte et al ., ), which may influence the responses of microbial decomposers to emersion in streams. We carried out an in situ experiment in two streams with contrasting environmental characteristics (i.e., eutrophication degree, temperature, oxygen levels): Oliveira Stream (Duarte et al ., ; Lima‐Fernandes et al ., ; Pereira et al ., ) and Este River (Pascoal et al ., ; Duarte et al ., ) located in the Ave river basin (Northwest of Portugal). The study site in the Oliveira Stream is in an area with low human impact, while the study site in the Este River is near the industrial park of the city of Braga.…”

Section: Introductionmentioning

confidence: 99%

“…The study site in the Oliveira Stream is in an area with low human impact, while the study site in the Este River is near the industrial park of the city of Braga. Based on previous experiments (Pascoal et al ., ; Duarte et al ., ; Lima‐Fernandes et al ., ; Pereira et al ., ), we expect that microbial decomposer communities will differ between the two streams, and thus, the exposure to emersion may lead to differential functional responses. As a general outcome, we expect a greater emersion effect in the altered stream, as previous studies have shown that less impacted systems are more resilient to new disturbances (Folke et al ., ) and harbour more stable communities (i.e., Wittebolle et al ., ).…”

Section: Introductionmentioning

confidence: 99%

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Responses of microbial decomposers to drought in streams may depend on the environmental context

Duarte

Mora-Gómez

Romaní

et al. 2017

Environ Microbiol Rep

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A consequence of drought in streams is the emersion of decomposing leaf litter, which may alter organic matter recycling. We assessed the effects of emersion on decomposition of black poplar leaves and associated microbes (microbial biomass, extracellular enzyme activities and microbial diversity) in two streams with distinct characteristics, in particular nutrients, temperature and oxygen levels. Leaf decomposition rates, fungal biomass and extracellular enzyme activities were lower in the most impacted stream (high nutrients and temperature, low oxygen). Also, the structure of fungal and bacterial communities differed between streams. Emersion strongly affected all microbial functional measures. Leaf decomposition, fungal biomass and extracellular enzyme activities were more sensitive at the most pristine site, while fungal reproduction and bacterial biomass production were more affected by emersion at the most impacted stream. Microbial community structure was strongly altered after emersion. Although similar effects on leaf-associated microbes were found in both streams, functional responses to emersion differed probably as a consequence of different initial microbial communities with different sensitivity to the drying stress. Our study highlights the need of understanding the effects of drought in streams suffering from different environmental perturbations, since responses to emersion appear to depend on the environmental context.

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“…Антропогенні фактори тією чи іншою мірою впливають на різноманіття, структурні та функціональні характеристики угруповань грибів різних таксономічних груп (Terehova, 2007;Pereira et al, 2016), причому зворотна реакція грибних організмів дає підстави вважати їх біоіндикаторами екологічного стану середовища існування (Mendes et al, 1998). Добре досліджені антропогенні зміни мікобіоти ґрунтових грибів, зокрема, за впливу забруднення пестицидами (Mandić et al, 2005), важкими металами (Bespalova et al, 2006), радіонуклідами (Dion and Nautiyal, 2008), пірогенного навантаження (Buscardo et al, 2015).…”

Section: вступunclassified

Species composition of Dothideomycetes in the anthropogenically transformed ecosystems of the steppe zone of Ukraine

Korolyova

2017

Biosys. divers.

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The article considers the species composition of the Dothideomycetes and its structural characteristics in conditions of anthropogenically transformed ecosystems of the steppe zone of Ukraine. The materials of the work were the original mycological collection carried out as part of the mycological survey of this territory during 2008–2016, as well as the materials of the herbarium of the Institute of Botany named after M. Kholodny of the National Academy of Sciences of Ukraine. Herbarium collection and identification of the samples were performed in accordance with the generally accepted methods of cameral processing of xylotrophic, herbotrophic and coprothrophic micromycetes. To establish the taxonomic affiliation of species, the method of light microscopy was applied. As a result of our research, the species diversity of ascolocular fungi (Dothideomycetes) has been established in the anthropogenically transformed ecosystems of the steppe zone of Ukraine, which includes 156 species from 43 genera 19 families 5 orders and groups of taxa of Incertae sedis of the subclasses Dothideomycetidae and Pleosporomycetidae. The characteristic features of the taxonomic structure of the investigated mycobiota are the predominance of representatives of the order of Pleosporales, the families Cucurbitariaceae and Mycosphaerellaceae, the genera Cucurbitaria and Mycosphaerella. In the ecological structure of mycobiota in anthropogenically transformed ecosystems saprotrophic and xylotrophic species dominated. The ascolocular fungi species are form consortium connections with 178 species of vascular plants from 112 genera of 51 families, with the largest number of micromycetes (65 species) noted on plants of the Rosaceae. An analysis of the abundance of species in anthropogenically transformed ecosystems of the investigated area showed that 47% of the species are randomly distributed. Widespread species are Dothidea sorbi (Wahlenb.) Sacc., Cucurbitaria caraganae P. Karst., C. amorphae (Wallr.) Fuckel, Botryosphaeria dothidea (Moug.) Ces. & De Not., Otthia spiraeae (Fuckel) Fuckel. In the anthropogenically transformed ecosystems of the steppe zone of Ukraine, in comparison with natural ecosystems, the proportion of species from the genera Cucurbitaria and Mycosphaerella increases quantitatively, and the proportion of Leptosphaeria and Pleospora species decreases. An increase in the proportion of hemibiotrophic species in the ecological structure can be considered a characteristic feature of anthropogenic influence on mycobiota . Comparative analysis of quantitative and qualitative indicators of the mycobiota structure combined with spatial and temporal changes of these indicators can serve as an instrument for indicating its anthropogenic transformation. It would be promising to conduct further research on changes in the species structure of micromycetes exposed to various types of anthropogenic impact in terrestrial ecosystems of the steppe zone of Ukraine.

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Structural and functional measures of leaf-associated invertebrates and fungi as predictors of stream eutrophication

Cited by 36 publications

References 42 publications

Fungal Community as a Bioindicator to Reflect Anthropogenic Activities in a River Ecosystem

Fungal Community as a Bioindicator to Reflect Anthropogenic Activities in a River Ecosystem

Responses of microbial decomposers to drought in streams may depend on the environmental context

Species composition of Dothideomycetes in the anthropogenically transformed ecosystems of the steppe zone of Ukraine

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