Location: Celestún Biosphere Reserve, Yucatan, Mexico. 20.88 N 90.36 E depth 0.5 m.
Collection: Data collected from dinghy. No vessel name. June 2009 and May 2015.

Sediment cores were collected during three expeditions to Celestun Lagoon in 2006, 2009, and 2015. Sediments were stored in cold (4 Celcius) storage. Short cores were sectioned at 2 cm intervals, and long cores were processed at 5 cm resolution. Foraminifera samples were sieved, deflocculated, and handpicked for geochemical analysis, including δ11B, 87Sr/86Sr, and δ18O.

Additional methods citations:

Boron isotope method: Wang et al. (2020).
Strontium isotope method: Liu et al. (2012).
pH and borate equations: Foster et al. (2016).
Organic carbon in sediments. Modified to use chilled sulfuric acid with sonication to ensure complete decarbonation: Verardo et al. (1990).

Related dataset descriptions (See section "Related Datasets" for data citations):

Water samples:
BCO-DMO dataset https://www.bco-dmo.org/dataset/941377 contains water sample data collected concurrently with the May 2015 sampling event.

This study and Paytan (2021, BCO-DMO dataset https://www.bco-dmo.org/dataset/564766) both derive groundwater from the same regional aquifer in Yucatan, Mexico, and both studies review the effects of low-pH springs on saturation and calcification of organisms. They are different sample material.

The sediment cores and assemblages in Hardage et al. (2021, doi:10.25921/qkc1-yw35) at NOAA provide the sample material for the geochemistry reported in this study (foraminifera, bulk sediment, physical observations). The Hardage et al. (2021) dataset also contains additional lithology and geochemistry that can be paired with these new data for interested parties.

Organism Life Science Identifier (LSID):
Ammonia parkinsoniana, urn:lsid:marinespecies.org:taxname:418095

Instrument and equipment list:

Piston, Bolivia, Livingstone corers: coring devices used to collect sediments.
0.5 mL micro-centrifuge tubes: used to store crushed foraminifera for cleaning.
Neptune multi-collector inductively coupled plasma mass spectrometer (MC-ICPMS).
Thermo Scientific Element XR ICPMS.
Kiel IV Carbonate Device.
ThermoScientific MAT-253 dual-inlet isotope ratio mass spectrometer.
Carlo Erba elemental analyzer IRMS.

941327_v1_foram-boron-isotopes.csv