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Valve teratologies and Chl c in the freshwater diatom Tabellaria flocculosa as biomarkers for metal contamination

Goncalves, Sara and Almeida, Salomé F.P. and Figueira, Etelvina and Kahlert, Maria (2019). Valve teratologies and Chl c in the freshwater diatom Tabellaria flocculosa as biomarkers for metal contamination. Ecological Indicators. 101 , 476-485
[Journal article]

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Abstract

Freshwater benthic diatoms, routinely used for bioassessment, are potential metal indicators because of their known capacity to reflect changes in water chemistry. Nevertheless, the effect of metals on benthic freshwater diatoms is still poorly understood. Metals, such as Zn and Cu, are not only essential as micronutrients, but also one of the main anthropogenic pressures in aquatic ecosystems. However, metal stress cannot be detected with the current European standard methods using bioindicators for environmental assessment, so new tools need to be developed. We studied the effects of Zn and Cu on the freshwater diatom Tabellaria flocculosa. This diatom isolated from a Zn and Cu contaminated stream, was exposed to different concentrations of Zn and Cu, and the metal effects were assessed by measuring physiological ((growth, fluorescence, pigments’ content (Chl a, c, carotenoids)) and morphological parameters (teratological forms). We found that at environmental concentrations occurring in European streams, Zn and Cu showed toxic effects on T. flocculosa. Toxic effects induced by Zn were only observed at high concentrations (500 and 1000 µg/L), resulting in fluorescence changes, an increase of Chl c cellular content and an increase of teratological forms (with an increase of more heavily deformed valves with increasing metal concentrations). Increasing Cu exposure induced several changes, such as increasing the cellular content of Chl a and c, while carotenoids’ cellular content decreased. Cu also increased the number of T. flocculosa frustule deformations. Cu did not affect the cellular fluorescence. Our results thus show that the frequency of diatom teratologies could potentially be used to assess metal stress for the studied metals Zn and Cu. Additionally, the analysis of algal pigments could potentially separate the effects of different metals.

Authors/Creators:Goncalves, Sara and Almeida, Salomé F.P. and Figueira, Etelvina and Kahlert, Maria
Title:Valve teratologies and Chl c in the freshwater diatom Tabellaria flocculosa as biomarkers for metal contamination
Year of publishing :2019
Volume:101
Page range:476-485
Number of Pages:10
Publisher:Elsevier
ISSN:1470-160X
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Accepted version
Copyright:Creative Commons: Attribution-Noncommercial-No Derivative Works 4.0
Full Text Status:Restricted
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Environmental Sciences (social aspects to be 507)
Keywords:Zinc, Copper, Physiological indicators, Pigments, Valve teratologies
URN:NBN:urn:nbn:se:slu:epsilon-p-100192
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-100192
Additional ID:
Type of IDID
DOI10.1016/j.ecolind.2019.01.032
ID Code:16159
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: SLUpub Connector
Deposited On:11 Jul 2019 10:02
Metadata Last Modified:11 Jul 2019 10:02

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