DOI: 10.5061/dryad.gb5mkkx47
title: Chironomid and aquatic invertebrate assemblages and deepwater oxygen availability during the Lateglacial and Holocene in a small Swiss lowland lake (Bichelsee, Switzerland)

description: The data herein presents chironomid and aquatic invertebrate (counts,
 percentages, influxes) records from a small Swiss lowland lake (Bichelsee,
 Switzerland) during the Lateglacial and Holocene. Associated deepwater
 oxygen availability reconstructions are also present in this dataset as
 well as the data used to draw the figures of the associated publication.
description: Sediment samples were gently sieved under water with a 100
 micrometer sieve. Chironomids and other aquatic invertebrates were then
 hand picked using a Bogorov tray under the stereomicroscope (20–50x
 magnification) and deposited on a microscope slide. The microscope slides
 were then air dried for a few hours before being permanently mounted using
 Euparal. Chironomid and other aquatic invertebrate remains were identified
 to the highest possible taxonomic resolution under a compound microscope
 (100–400x magnification). The full laboratory methods are presented in the
 associated publication. For post identification data
 processing and deepwater oxygen availability reconstructions please see
 the associated publication in Communication Earth &
 Environment.
description: # Chironomid and aquatic invertebrate assemblages and deepwater oxygen
 availability during the Lateglacial and Holocene in a small Swiss lowland
 lake (Bichelsee, Switzerland) Dataset DOI:
 [10.5061/dryad.gb5mkkx47](https://doi.org/10.5061/dryad.gb5mkkx47) ##
 Description of the data and file structure Chironomid and other aquatic
 invertebrate data (counts, percentages, influxes) from Bichelsee
 (Switzerland). The R code used to calculate the CCAs based on modern
 aquatic invertebrate samples is also provided. The data and R code are
 Supplementary Information of the article "Dynamic deepwater
 invertebrate populations challenge the concept of oxygen-rich reference
 conditions for European lakes" published in *Communications Earth
 & Environment*. ### Files and variables #### File: R_code_for_CCAs.txt
 **Description:** R code used to calculate the CCAs based on modern aquatic
 invertebrate samples in Swiss lakes with the Bichelsee downcore samples
 plotted passively. #### File: Supplementary_Data_Publication.xlsx
 **Description:** Chironomid and other aquatic invertebrates data (counts,
 percentages, influxes), ^210^Pb and ^137^Cs data as well as data used to
 draw the figures of the main manuscript ##### Variables * Sample_id:
 sample identification number * Top_seddepth: sediment depth of the upper
 margin (most recent) of the sample * Top_sedage: age of the upper margin
 (most recent) of the sample * Middle_seddepth: sediment depth of midpoint
 of the sample * Middle_seddage: age of the midpoint of the sample *
 Bottom_seddepth: sediment depth of the lower margin (oldest) of the sample
 * Bottom_seddage: age of the lower margin (oldest) of the sample
 Individual morphotypes counts (*Invertebrates_Counts_all*,
 *Invertebrates_Counts_amal*), percentages
 (*Invertebrates_Percentages_amal*) and influxes
 (*Invertebrates_Influx_all*) are given for each morphotypes in all the
 samples analysed. In sheets *Invertebrates_Counts_all* and
 *Invertebrates_Counts_amal*, the Total Chironomidae column corresponds to
 the sum of all Chironomidae individuals (columns I-DI) identified in the
 corresponding sample, whereas the column Total aquatic invertebrates
 (incl. Chironomidae) corresponds to the sum of all Chironomidae
 individuals (column DJ) and all the other aquatic invertebrates (columns
 DL-DX). Data_Figure 2: Development of invertebrate indicators of deepwater
 oxygen availability in Bichelsee and vegetation around the lake during the
 past 13,000 years. Data_Figure 3: Development of chironomid influx in
 relation to vegetation, sedimentation processes and human activities near
 Bichelsee over the past 8000 cal. BP. Data_Figure 4: Development of
 aquatic invertebrate assemblages, selected diatom groups and
 invertebrate-based indicators of deepwater oxygen availability in
 Bichelsee during the past 300 years. #### File: Supplementary_Table_1.csv
 **Description:** radiocarbon dates used to calculate the age-depth
 relationship of the Bichelsee sediment core. ## Code/software R Studio is
 required to read and perform the CCAs. The vegan package version 2.6-4 was
 used in our case.