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Long‐term dynamics in microbial eukaryotes communities: a palaeolimnological view based on sedimentary DNA
Author(s) -
Capo Eric,
Debroas Didier,
Arnaud Fabien,
Guillemot Typhaine,
Bichet Vincent,
Millet Laurent,
Gauthier Emilie,
Massa Charly,
Develle AnneLise,
Pignol Cécile,
Lejzerowicz Franck,
Domaizon Isabelle
Publication year - 2016
Publication title -
molecular ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.619
H-Index - 225
eISSN - 1365-294X
pISSN - 0962-1083
DOI - 10.1111/mec.13893
Subject(s) - dinophyceae , biology , ecology , biodiversity , trophic level , eutrophication , relative species abundance , lake ecosystem , ecosystem , abundance (ecology) , climate change , phylogenetic diversity , environmental dna , ancient dna , phylogenetic tree , phytoplankton , nutrient , population , biochemistry , demography , sociology , gene
Abstract Assessing the extent to which changes in lacustrine biodiversity are affected by anthropogenic or climatic forces requires extensive palaeolimnological data. We used high‐throughput sequencing to generate time‐series data encompassing over 2200 years of microbial eukaryotes (protists and Fungi) diversity changes from the sedimentary DNA record of two lakes (Lake Bourget in French Alps and Lake Igaliku in Greenland). From 176 samples, we sequenced a large diversity of microbial eukaryotes, with a total 16 386 operational taxonomic units distributed within 50 phylogenetic groups. Thus, microbial groups, such as Chlorophyta, Dinophyceae, Haptophyceae and Ciliophora, that were not previously considered in lacustrine sediment record analyses appeared to be potential biological markers of trophic status changes. Our data suggest that shifts in relative abundance of extant species, including shifts between rare and abundant taxa, drive ecosystem responses to local and global environmental changes. Community structure shift events were concomitant with major climate variations (more particularly in Lake Igaliku). However, this study shows that the impacts of climatic fluctuations may be overpassed by the high‐magnitude eutrophication impacts, as observed in the eutrophicated Lake Bourget. Overall, our data show that DNA preserved in sediment constitutes a precious archive of information on past biodiversity changes.