Changes in the epipelic diatom assemblage in nutrient rich streams due to the variations of simultaneous stressors

Cochero, Joaquín; Licursi, Magdalena; Gómez, Nora

doi:10.1016/j.limno.2014.10.004

Cited by 31 publications

(21 citation statements)

References 51 publications

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“…The sediment of the stream is mostly composed of slime–clay with low proportions of gravel and sand. The land uses in the basin are mainly agricultural and peri‐urban (Cochero, Licursi, & Gómez, ).…”

Section: Methodsmentioning

confidence: 99%

Use of native macrophytes for recovery of the habitat structure and complexity of a lowland stream affected by river engineering works: Implications for management

Paz

Gelis

Licursi

et al. 2018

River Research & Apps

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Macrophytes were transplanted into a lowland stream affected by river engineering works. The aim was to analyse the feasibility of their reintroduction and potential to be used for the recovery of the structure and complexity of the lotic habitat. Macrophytes contribute heterogeneity to streams, modify the current velocity, affect sediment and nutrients dynamics, and provide a substrate for epiphytic biofilm. We transplanted specimens of Ludwigia peploides, Gymnocoronis spilanthoides, and Egeria densa into a stream located in the Pampean plain (Buenos Aires, Argentina). The growth and coverage of the transplanted macrophytes and the changes in the structure of the epiphytic biofilm were assessed. The results show that specimens of G. spilanthoides were negatively affected by the transplant and new conditions, E. densa decreased its coverage after the transplant, and L. peploides endured the transplant and adapted to the dredging site with successful establishment and expansion. There were no significant differences between the biofilm developed in L. peploides and G. spilanthoides. Additionally, the biofilm had similar features between the transplanted macrophytes and those from a site with no dredging. Considering this result, the selection between these macrophytes in relation to biofilm production is indifferent. However, as L. peploides adapts better to the new conditions generated by the river engineering works, its use in the rehabilitation project is recommended.Moreover, it is important to consider the ability of different species of macrophytes to survive the transplant and grow under new environmental conditions in order to include them in rehabilitation projects.

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Section: Methodsmentioning

confidence: 99%

Use of native macrophytes for recovery of the habitat structure and complexity of a lowland stream affected by river engineering works: Implications for management

Paz

Gelis

Licursi

et al. 2018

River Research & Apps

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“…The first reach, with a lower urban impact (hereafter “LI,” 34°58′26.58″S/58°3′13.13″W), runs through a peri‐urban area with a moderate agricultural impact, mainly run‐off from greenhouses; the second stream reach with a higher urban impact (hereafter “HI,” 34°53′24.85″S/58°2′56.07″W) runs through a dense urban area, located downstream from a gated community and the discharges of a meat packing industry. Both reaches have similar geomorphology and hydrological characteristics, low velocity streams (2–3 cm/s), similar turbidity, do not have riparian vegetation, and are rich in nutrients, particularly phosphorous and nitrogen (Cochero, Licursi, & Gómez, , ; Feijoó & Lombardo, ; Giorgi, Feijoó, & Tell, ). A significantly lower water quality, due to higher concentrations of nutrients, organic matter, and heavy metals (such as Zn, Pb, Cu, and Cd), have been reported at the HI when compared with the LI site in previous studies (Armendáriz, Cortese, Rodriguez, & Rodrigues Capítulo, ; Cochero et al, ; López van Oosterom, Ocon, Armendariz, & Rodrigues Capitulo, ; Ronco, Camilión, & Manassero, ; Sierra, Gómez, Marano, & Siervi, ).…”

Section: Methodsmentioning

confidence: 99%

Biofilm early stage development in two nutrient‐rich streams with different urban impacts

Cochero

Gelis

Sathicq

et al. 2018

River Research & Apps

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The aim of this study was to describe the colonization of the biofilm during its early stages under different concentrations of nutrients and organic matter, specifically in urban streams influenced by agriculture and urbanization. We hypothesized that in a stream with higher concentrations of nutrients and organic matter, the initial biomass growth would be faster, and the changes in the structure of the community would be greater.Sterile glass substrates were placed in 2 urban streams that differed in nutrient and organic matter concentrations; samples were collected during their first week of colonization to measure total biomass, bacterial biomass, chlorophyll a, activity of the electron transfer system, and the community composition. Results show that biofilm development in both streams began within a few hours and differed under different conditions of nutrients; in the stream with a better water quality, the colonization dynamics consisted of 2 increments of bacterial biomass linked with an increase of algal biomass. In the urban stream with higher nutrient and organic matter concentrations, biofilm development was slower and consisted of a simultaneous increase of bacteria and algae, consistent with a lower electron transfer system activity. Therefore, the dynamics of the colonization process in addition to those characteristics of the fully developed biofilm could have potential applications in water monitoring of urban streams.

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“…), but they can also be found in shallow lakes and rivers (Cochero et al. ). Benthic microalgae are one of the major photosynthetic components driving primary productivity in those environments.…”

Section: Introductionmentioning

confidence: 99%

On the feedback between water turbidity and microphytobenthos growth in shallow tidal environments

Pivato

Carniello

Moro

et al. 2019

Earth Surf Processes Landf

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Shallow tidal environments (e.g. bays, estuaries, lagoons) represent one of the most productive ecosystems in the world, and they are threatened by current climate change and increasing human pressure. Monitoring the bio‐morphodynamic evolution of these environments is therefore a crucial task that requires a detailed and holistic scrutiny. The present study aims to investigate the temperature of the water–sediment continuum, its effect on the related microphytobenthos (MPB) growth and the related bio‐stabilization of the bed sediment surface under different water depth and water turbidity conditions. We investigated the vertical energy transfer and the temperature dynamics by applying a 1‐D model to a shallow coastal lagoon. Our results show that the water temperature does not substantially change under different turbidity conditions, whereas the sediment temperature exhibits important changes. Two major factors driving the MPB photosynthetic growth are the sediment surface temperature and the light availability at the sediment bed, which can both be computed using the vertical energy transfer model. We observed that, in general, clear water conditions better promote MPB growth over the entire year. The limiting factor for the photosynthetic process is usually the light availability at the bottom, which increases under clear water conditions. As MPB provides a bio‐stabilizing effect on the bed sediments by producing a biofilm on the sediment surface that reduces sediment resuspension, our results suggest a positive feedback between MPB growth and water column turbidity. Furthermore, MPB growth and the related sediment bio‐stabilization are clearly affected by the seasonal variation of surface sediment temperature and light availability. This seasonal variation of MPB growth rate and surface sediment bio‐stabilization must be considered when studying the long‐term morphodynamic evolution of tidal environments. © 2018 John Wiley & Sons Ltd.

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Changes in the epipelic diatom assemblage in nutrient rich streams due to the variations of simultaneous stressors

Cited by 31 publications

References 51 publications

Use of native macrophytes for recovery of the habitat structure and complexity of a lowland stream affected by river engineering works: Implications for management

Use of native macrophytes for recovery of the habitat structure and complexity of a lowland stream affected by river engineering works: Implications for management

Biofilm early stage development in two nutrient‐rich streams with different urban impacts

On the feedback between water turbidity and microphytobenthos growth in shallow tidal environments

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