Same same, but different: The response of diatoms to environmental gradients in Fennoscandian streams and lakes – barcodes, traits and microscope data compared

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Maria Kahlert, Bonnie Bailet, Teofana Chonova, Satu Maaria Karjalainen, Susanne C. Schneider, Kálmán Tapolczai. Same same, but different: The response of diatoms to environmental gradients in Fennoscandian streams and lakes – barcodes, traits and microscope data compared. Ecological Indicators 130 (2021), 108088, ISSN 1470-160X. https://doi.org/10.1016/j.ecolind.2021.108088

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Title: Same same, but different: The response of diatoms to environmental gradients in Fennoscandian streams and lakes – barcodes, traits and microscope data compared
Author: Kahlert, Maria; Bailet, Bonnie; Chonova, Teofana; Karjalainen, Satu Maaria; Schneider, Susanne C.; Tapolczai, Kálmán
Publisher: Elsevier
Date: 2021
Language: en
Belongs to series: Ecological Indicators 130 (2021), 108088
ISSN: 1470-160X
URI: http://hdl.handle.net/10138/336722
Abstract: We developed and compared the performance of freshwater benthic diatom indices calculated from (i) traditional morphological species identification, (ii) Amplicon Sequence Variants (ASVs) obtained via DNA metabarcoding, and (iii) morphological traits to indicate eutrophication in rivers and lakes in Fennoscandia. Based on the results, we provided recommendations for the future routine use of diatom bioassessment tools in environmental monitoring and assessment. Our results show that ASVs are the most promising candidates to be used in environmental assessment. Indices based on ASVs correlated better with TotP concentrations than morphological taxa data, whereas the trait indices correlated least. We could see by studying the taxonomic assignments of the ASVs that traditional morphotaxa were divided up into several ASVs with different ecological profiles, which explained part of the better index performance and also encourages further studies on diatom diversity and ecological preferences. In general, ASV- and morphotaxon-specific optima differed slightly between streams and lakes, but were significantly correlated with each other. This means that it should be possible to develop a common index that is applicable in both streams and lakes, but boundary values with respect to TotP might need to be set separately for them. More knowledge on diatom traits is required to enable their use for environmental assessment.
Description: Highlights • Amplicon Sequence Variants (ASVs) are a promising unit for diatom nutrient indices. • Diatom indices based on morphology, ASVs and traits were related to TotP concentrations. • Correlations of indices to TotP was best for ASVs, followed by morphology and traits.
Subject: Amplicon Sequence Variants
environmental assessment
index
indicator value
eutrophication
metabarcoding
DNA metabarcoding
evaluation
rivers
diatoms
state of the nature
water quality
fresh water
indicators
indices
Nordic countries
Fennoscandia
Subject (ysa): arviointi
piilevät
järvet
vedenlaatu
joet
ympäristön tila
makea vesi
indikaattorit
indeksit
rehevöityminen
DNA-viivakoodit
Pohjoismaat
Fennoskandia
Rights: https://creativecommons.org/licenses/by/4.0/


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