Long-term survey of heavy-metal pollution, biofilm contamination and diatom community structure in the Riou Mort watershed, South-West France

Morin, Soizic; Duong, Thi Thuy; Dabrin, Aymeric; Coynel, Alexandra; Herlory, Olivier; Baudrimont, Magalie; Delmas, François; Durrieu, Gilles; Schäfer, Jörg; Winterton, Peter; Blanc, Guillaume; Coste, Michel

doi:10.1016/j.envpol.2007.04.023

Cited by 192 publications

(116 citation statements)

References 46 publications

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“…Sun et al (2011) found very high trace metal contents in the sediment of Zone E. The toxicity of heavy metals could impact the growth of diatoms (Morin et al, 2008). The minimum abundance in SB appeared at site E1 (368 valves/g DW).…”

Section: Zonesmentioning

confidence: 96%

Diatom and silicoflagellate assemblages in modern surface sediments associated with human activity: A case study in Sishili Bay, China

Di¹,

Chen²,

Wang³

et al. 2013

Ecological Indicators

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a b s t r a c tThe spatial distribution of diatom and silicoflagellate fossils deposited in modern surface sediments was studied in inshore and offshore zones of Sishili Bay, China, to explore the impact of human activity on the coastal ecosystem. The sediments from 28 sites representing a gradient in intensity of human activity from inshore to offshore were sampled. Although the nutrient parameters inshore showed far higher concentrations than the offshore area, due to sewage discharge and waste dumping in the bay, the average fossil abundance did not differ significantly between the two areas. The diatom fossil Paralia sulcata, supposed to be a eutrophic indicator dominated most sediment samples and displayed a significant and positive correlation with dissolved inorganic nitrogen and phosphorus in the upper water column, but did not show a significant difference in abundance between inshore area and offshore area. Factors such as sediment disturbance (e.g., shipping), grazing pressure (e.g., shellfish aquaculture farm) and sediment characteristics (e.g., grain size) can affect the preservation of fossil debris in the sediment and lower the precision with which human activities can be associated with the fossil abundance.

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Section: Zonesmentioning

confidence: 96%

Diatom and silicoflagellate assemblages in modern surface sediments associated with human activity: A case study in Sishili Bay, China

Di¹,

Chen²,

Wang³

et al. 2013

Ecological Indicators

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“…As suggested by Morin et al [64] and Arini et al [65], deformity frequencies between 0.5 and 1% are considered as naturally occurring. With abnormal valve frequencies of 1-1.2%, it is difficult to confirm a specific response to metal contamination at sites JC1, JC2, JC4, JC5, JC6, JC7, NC1, and NC2, as these values are close to the estimated natural background.…”

Section: Diatom Teratologies As a Response To Stressmentioning

confidence: 98%

Freshwater Diatoms as Indicators of Combined Long-Term Mining and Urban Stressors in Junction Creek (Ontario, Canada)

et al. 2018

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Sudbury (Ontario, Canada) has a long mining history that has left the region with a distinctive legacy of environmental impacts. Several actions have been undertaken since the 1970s to rehabilitate this deteriorated environment, in both terrestrial and aquatic ecosystems. Despite a marked increase in environmental health, we show that the Junction Creek system remains under multiple stressors from present and past mining operations, and from urban-related pressures such as municipal wastewater treatment plants, golf courses and stormwater runoff. Water samples have elevated metal concentrations, with values reaching up to 1 mg·L −1 Ni, 40 µg·L −1 Zn, and 0.5 µg·L −1 Cd. The responses of diatoms to stressors were observed at the assemblage level (metal tolerant species, nutrient-loving species), and at the individual level through the presence of teratologies (abnormal diatom frustules). The cumulative criterion unit (CCU) approach was used as a proxy for metal toxicity to aquatic life and suggested elevated potential for toxicity at certain sites. Diatom teratologies were significantly less frequent at sites with CCU values <1, suggesting "background" metal concentrations as compared to sites with higher CCU values. The highest percentages of teratologies were observed at sites presenting multiple types of environmental pressures.

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“…Furthermore, they play a key role in nutrient and heavy metal absorption. [7][8][9][10] But outside water bodies, diatom colonies develop in a large variety of substrates, provided that they fulfill certain environmental criteria-among which moisture and light play a prominent role. Soils, rocks, lichen, litter, vegetation, or bark are all offering potential habitats for so-called aerial diatomsor what we term here as terrestrial diatoms.…”

Section: Box 1 Diatom Habitatsmentioning

confidence: 99%

Terrestrial diatoms as tracers in catchment hydrology: a review

et al. 2017

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Diatoms are remarkable organisms. They are present in almost all habitats containing water (e.g., lakes, streams, soils, bark) and rank among the most common algal groups in both freshwaters and marine ecosystems. The ubiquitous character of aquatic diatoms has triggered countless applications as environmental tracers for studies in water quality, paleoclimate reconstruction and sediment tracing. However, diatoms also occur in the terrestrial environment. It is this plethora of diatom life-forms that has recently triggered interest in their use as tracers of hydrological processes. The use of diatoms in catchment hydrology has been very limited. Part of the reason is that until recently, the taxonomy and ecology of terrestrial diatom assemblages were largely unknown. However, in the past decade, much work has been done to quantify terrestrial diatom reservoir size, dynamics, and potential depletion following precipitation events. Therefore, such terrestrial diatoms now hold promise for use in catchment hydrology-for tracing runoff flow sources and pathways across a wide range of spatial scales. Here we review the literature on terrestrial diatoms and describe the various sampling protocols that have been designed and tested for specific applications in hydrological processes research. We review and summarize the work on terrestrial diatom reservoir characterization, transport mechanisms and pathways to show how such diatom-based tracer work might be possible at the catchment scale for rainfall-runoff studies. Finally, we present a vision for future work that might take advantage of terrestrial diatoms in catchment hydrology and discuss the main challenges going forward. © 2017 The Authors. WIREs Water published by Wiley Periodicals, Inc. How to cite this article:WIREs Water 2017Water , 4:e1241. doi: 10.1002Water /wat2.1241 INTRODUCTION D iatoms (Bacillariophyta) are present in almost all habitats containing water (e.g., lakes, streams, soils, litter, bark). They count among the most common algal groups in both freshwaters and marine ecosystems. 1 Despite their microscopic size (10-200 microns), 2 diatoms generate an impressive amount of carbon through photosynthesis: almost as much as all rainforests combined. 3 Identification of diatoms date back to the early 1700s as noted by Round et al. 1 Decades later, Otto Friedrich Müller published the first description of a diatom in 1783 (Vibrio paxillifer ≡ Bacillaria paradoxa). Since then, This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes. more than 64,000 diatom species have been described-and new species are added to that list almost daily with the number of extant species extrapolated to ca 100,000. 4,5 The identification of diatoms (from the Greek 'diatomos' or 'cut in half') commonly relies on the highly differentiated cell wall (or frustule) that is mostly co...

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Long-term survey of heavy-metal pollution, biofilm contamination and diatom community structure in the Riou Mort watershed, South-West France

Cited by 192 publications

References 46 publications

Diatom and silicoflagellate assemblages in modern surface sediments associated with human activity: A case study in Sishili Bay, China

Diatom and silicoflagellate assemblages in modern surface sediments associated with human activity: A case study in Sishili Bay, China

Freshwater Diatoms as Indicators of Combined Long-Term Mining and Urban Stressors in Junction Creek (Ontario, Canada)

Terrestrial diatoms as tracers in catchment hydrology: a review

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