DOI: 10.13130/rd_unimi/oqb5le
title: Replication data for "Brachiopods as archives of intrannual, annual and interannual environmental variations"

description: 1) Table S1. Excel file in xlsx format with stable isotope and trace elemental data of seven specimens belonging to three species of modern brachiopods. Stable isotope data have been obtained using an Isoprime dual inlet mass spectrometer plus Multiprep device, whereas trace elemental data using an Agilent 8900 QQQ-ICP-MS. Sheet 1 of the excel file ("specimens") contains information on the type of analysis performed on each specimens and the environmental data of the sampling locality for each species. Excel file composed of 8 sheets. Each Excel sheet refers to a species (L. uva 52, L. uva 58, L. neozelanica 60, L. neozelanica 56, G.vitreus 5, G. vitreus 7V, G. vitreus 7D) and contains columns with numerical values: δ13C ‰ VPDB, δ18O‰ VPDB and trace elements, where available. 

2) Table S2. Excel file in xlsx format with data related to the linear and curvatur length, and the length of the growth increments on the shell external surface calculated on 31 specimens of G. vitreus and two specimens of L. uva using using a stereomicroscope Motic SMZ-171-TLed. Excel file composed of 33 sheets.

3) The README file contains the instructions, the software and the data to reproduce the main results of the study. The analysis has been performed using python.
The folder "Brachiopods_as_archives_of_intra_and_interannual_environmental_variations" contains the following subfolders:
- data: Contains the isotope data stored in an Excel file.
- notebooks: Includes Python notebooks for reproducing the main results.
- lib: Contains Python files with auxiliary methods used in the notebooks.
- results: Stores the figures generated by the notebooks.
- environmental.yaml: Yaml file used for building the conda environement for the python software.

Contents of the data folder:
- Isotopi brach x VBG.xlsx: The file is an Excel file in xlsx format containing the isotope data for different species. Each Excel sheet refers to a species (L. uva 52, L. uva 58, L. uva A+B, L. neozelanica 60, L. neozelanica 56, G.vitreus 5, G. vitreus 7 II e III, G. vitreus 7 only III, M. sanguinea K, Gryphus media) and has data for the ventral and dorsal valves.
Each sheet contains the species data as K, Sinf and equilibrium field as numeric data. In addition each sheet contains 3 columns with numerical values: δ13C ‰ VPDB, δ18O‰ VPDB and St lineare. These columns respectively contains the isotope data for Carbon and Oxygen, and the measured lenght increments.

Contents of the notebooks folder:
- paper_figures.ipynb: Generates the main figures, including the isotope time series and power spectra plotted against the 95% confidence level curve.
- supplementary_paper_figures.ipynb: Produces supplementary figures, including tests on the isotope time series and the fit of the isotope data using periodic functions based on significant periodicities.

Contents of the lib folder:
- periodicity_analysis.py: contains the python code used to perform the periodicity analysis of the isotope data.
- utility_functions.py: contains the python code to upload and elaborate the isotope data.
description: Phyton (to elaborate the data)
description: Mass spectrometry (to obtain the data)
description: Table S1 is an excel file composed of 8 sheets.
Table S2 is an excel file composed of 33 sheets.
It is necessary to download the files to view all the sheets.