Biodiversity and functional trait effects on copper toxicity in a proof-of-concept multispecies microalgal assay
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Kuupäev
2021
Kättesaadav alates
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Elsevier
Abstrakt
This study aimed to elucidate biodiversity effects on algal biomass production under toxicant stress and to increase
environmental realism in ecotoxicological testing by exposing artificial algal communities to Cu2+. All 15
possible combinations of four functionally distinct microalgal species (green algae Chlamydomonas reinhardtii and
Raphidocelis subcapitata, diatom Fistulifera pelliculosa and cyanobacterium Synechocystis sp.) were exposed to 0.01
and 0.02 mg Cu2+ l 1 in a modified algal growth inhibition assay (OECD 201). Compared to monocultures, the
replicability of assays in multispecies communities decreased. Copper-induced inhibition of the biomass yield of
individual species did not change due to interactions between species in multispecies tests, indicating that Cu
toxicity was the driver of competitive outcomes. Biomass yield was increased at higher species richness in
controls and Cu-exposed treatments. Selection effect is considered to prevail over trait complementarity in our
experiments, because functional diversity, that expresses species trait variability and equality in species’
occurrence, had a negative effect on algal biomass yield, while species richness increased the yield. Algal
functional traits related to cell size were the best predictors of microalgal biomass production. Species identity
was identified as an important determinant of community-level outcomes.
This research was supported by the Estonian Research Council projects PSG311, PRG684 and PUT1574 and by ERDF projects TK134 and NAMUR+ 2014-2020.4.01.16-0123. We thank Laura Kaarma for her help with capturing micrographs of the algae for the manuscript.
This research was supported by the Estonian Research Council projects PSG311, PRG684 and PUT1574 and by ERDF projects TK134 and NAMUR+ 2014-2020.4.01.16-0123. We thank Laura Kaarma for her help with capturing micrographs of the algae for the manuscript.
Kirjeldus
Märksõnad
aquatic ecotoxicity, metal toxicity, multispecies assay, functional diversity, ecosystem functioning, articles