Diatom ecological guilds as indicators of temporally changing stressors and disturbances in the small Torna-stream, Hungary

Stenger‐Kovács, Csilla; Lengyel, Edina; Crossetti, Luciane Oliveira; Üveges, Viktória; Padisák, Judit

doi:10.1016/j.ecolind.2012.06.003

Cited by 103 publications

(75 citation statements)

References 53 publications

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“…(2014), Passy (2007) and Stenger-Kovács et al (2013). These authors show a decrease of the LPG and an increase of the MG when nutrient and organic matter contaminations increase.…”

Section: Discussionmentioning

confidence: 90%

“…Diatom communities also change with geology and river typology (Rimet, 2009;Tison et al, 2005), current velocity (Steinman and McIntire, 1986), predation (Feminella and Hawkins, 1995;Steinman, 1996), depth (Cantonati et al, 2009), type of substrate (Cazaubon et al, 1995;Eminson and Moss, 1980;Torrisi et al, 2006), hydrology (Falasco et al, 2016) and according to the presence of humic substances or metals (Morin et al, 2008). The high profile guild, by virtue of its position in contact with the water column, is probably the ecological guild under the influence of the greatest number of factors, including light , current intensity (Passy, 2007;Stenger-Kovács et al, 2013), predation (Steinman, 1996 and exposure to herbicides (Larras et al, 2014;Marcel et al, 2013;Rimet and Bouchez, 2011).…”

Section: Discussionmentioning

confidence: 99%

“…Acidic conditions can be favourable to either the high profile (Gottschalk and Kahlert, 2012) or the low profile (Pound et al, 2013) guild. At low conductivities the high profile guild is expected to increase, while motile diatoms are expected to decrease (Stenger-Kovács et al, 2013). This study proposes the hypothesis that sites contaminated by inorganic phosphorus should have lower abundances of low-profile, high-profile, pad, stalk, arbuscular and all types of colonial diatoms and higher abundances of motile, mobile, adnate and non-colonial diatoms.…”

Section: Introductionmentioning

confidence: 99%

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Modelling diatom life forms and ecological guilds for river biomonitoring

Marcel¹,

Berthon²,

Castets³

et al. 2017

Knowl. Manag. Aquat. Ecosyst.

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-Biomonitoring is central to the European Union's Water Framework Directive (WFD) and to the French water and aquatic environmental law, but most diatom indices do not separate different anthropogenic impacts. To address this gap, the effect of water chemistry on diatom ecological guilds and life forms was assessed in order to indicate stream perturbations. Generalised additive models (GAMs) were built on a large-scale data set of 1571 samples from the French monitoring network. The relationships between diatom ecological guild and life form metrics were investigated by Principal components analysis and the results predicted by GAMs. The models characterised eight chemical parameters that modified adaptive strategies (ecological guilds) and growth morphology (life forms). Total phosphorus, conductivity, nitrate and pH are the main influencing factors, followed by temperature, dissolved oxygen and organic matter. The findings confirm three groups of diatoms with different adaptive strategies: 1 -fast moving species, 2 -species growing close to the substrate and 3 -species extending to the surface layers of the biofilm. Thirteen diatom metrics displayed a variety of responses to different ranges of the eight chemical parameters. These metrics could be used to help to identify and quantify which chemical alterations are caused by polluted effluents in rivers.Keywords: benthic diatoms / ecological guilds / biological traits / biomonitoring / generalised additive model Résumé -Modélisation des formes de vie et guildes écologiques des diatomées pour la bioindication en rivières. La bioindication est centrale dans la directive cadre européenne sur l'eau et la loi française sur l'eau, mais la plupart des indices diatomiques ne séparent pas les différents impacts anthropiques. Pour combler ce manque, l'effet de la physico-chimie de l'eau sur les guildes écologiques et formes de vies des diatomées a été étudié pour indiquer des perturbations des cours d'eau. Des modèles additifs généralisés (GAMs) ont été construits sur un jeu de données de 1571 échantillons des réseaux de suivi des cours d'eau français. Les relations entre les métriques de guildes écologiques et formes de vie des diatomées ont été étudiées par une ACP et les résultats prédits par des GAMs. Les modèles ont caractérisé huit paramètres physico-chimiques qui modifient les stratégies adaptatives (guildes écologiques) et morphologies de croissance (formes de vie). Le phosphore total, la conductivité, les nitrates et le pH sont les facteurs les plus influents, suivis par la température, l'oxygène dissous et la matière organique. Les résultats confirment trois groupes de diatomées avec des stratégies adaptatives différentes : 1 -les espèces se déplaçant rapidement, 2 -les espèces proches du substrat et 3 -les espèces s'étendant vers la surface du biofilm. Quatorze métriques diatomiques ont montré une variété de réponses à différentes gammes de valeurs des huit paramètres physico-chimiques. Ces métriques pourraient être utilisées pour aider à identifier ...

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“…(2014), Passy (2007) and Stenger-Kovács et al (2013). These authors show a decrease of the LPG and an increase of the MG when nutrient and organic matter contaminations increase.…”

Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Modelling diatom life forms and ecological guilds for river biomonitoring

Marcel¹,

Berthon²,

Castets³

et al. 2017

Knowl. Manag. Aquat. Ecosyst.

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“…Increased nutrient load or conductivity induce changes of species composition in diatom assemblages (e.g. ZIEMANN et al 2001, STENGER-KOVÁCS et al 2013) via the frequent appearance of new taxa (e.g. some halophilic, mesohalophilic eutraphenic taxa) while the abund ance of some others decreases (e.g.…”

Section: Introductionmentioning

confidence: 99%

Halophilic diatom taxa are sensitive indicators of even short term changes in lowland lotic systems

Kókai¹,

Bácsi²,

Török³

et al. 2015

Acta Botanica Croatica

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-The occurrence and spread of halophilic diatom taxa in freshwater lotic ecosystems are infl uenced both by natural processes and anthropogenic pollution. Diatom assemblages were regularly monitored in lowland lotic systems in Hungary (Central Europe) during the unusually dry year of 2012. Highly pronounced changes in diatom composition were observed from spring to autumn. Halophilic taxa (especially Nitzschia sensu lato species) appeared in the dry autumn. In addition, the total relative abundances of halophilic species also increased up to autumn. Abundance of Nitzschia cf. lorenziana and Nitzschia tryblionella showed a positive correlation with chloride and phosphate concentration, while that of other taxa like Tryblionella apiculata or Tryblionella calida showed a positive correlation with the concentration of nitrate. Our fi ndings clearly demonstrated that these halophilic and mesohalophilic diatom taxa were sensitive indicators of even short-term changes in lowland lotic ecosystems, such as the increasing salt concentration from spring to autumn caused by the lack of rainfall and/or environmental loads.

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“…Reading these examples it can be concluded that there is no clear difference between 66 definitions used for disturbance and stress and attempts at discrimination of these terms are 67 rare (Stenger- Kovács et al, 2013). An additional difficulty is that some authors use the terms 68 disturbance and stress exclusively as stimuli, while others use them for the entire process, 69 including both causes and effects.…”

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confidence: 99%

Disturbance and stress: different meanings in ecological dynamics?

2013

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11There is an increasing frequency of papers addressing disturbance and stress in ecology 12 without clear delimitation of their meaning. Some authors use the terms disturbance and stress 13 exclusively as impacts, while others use them for the entire process, including both causes and 14 effects. In some studies, the disturbance is considered as a result of a temporary impact, which propose that changes triggered by the given stimuli can be evaluated on an absolute scale, 22 therefore, direction of change of the variable must not be used to choose one term or the other, i.e. to choose between stress and disturbance.

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Diatom ecological guilds as indicators of temporally changing stressors and disturbances in the small Torna-stream, Hungary

Cited by 103 publications

References 53 publications

Modelling diatom life forms and ecological guilds for river biomonitoring

Modelling diatom life forms and ecological guilds for river biomonitoring

Halophilic diatom taxa are sensitive indicators of even short term changes in lowland lotic systems

Disturbance and stress: different meanings in ecological dynamics?

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