Nacre microstructure records spatiotemporal variation in temperature in the modern ocean

Changing climatic conditions can have complex effects on the biomineralized segments of marine organisms, which in turn may influence individual fitness and survival. In nacreous shells, tablet thickness is one microstructural component that has been observed to positively correlate with ocean temperature, though the strength of this relationship is unclear, leaving unresolved whether temperature is a consistent predictor of tablet thickness and, if so, over what scales. Here we investigate the relationship between tablet thickness and temperature in two nacre-producing marine mollusks in the modern ocean. We explore the relationship between nacre tablet thickness and ocean temperature through a global analysis of present-day abalone (Haliotis) nacre, and a temporal analysis of nut clam (Nucula proxima) nacre using shells from individuals that lived before and after 1950 in two regions of the Gulf of Mexico. We document a positive relationship between tablet thickness and ocean temperat..., , # Data from: Nacre microstructure records spatiotemporal variation in temperature in the modern ocean

Dataset DOI: [10.5061/dryad.kd51c5bjb](10.5061/dryad.kd51c5bjb)

## Description of the data and file structure

Nacre tablet thickness data for specimens of two marine mollusks (*Haliotis* and *Nucula proxima*). See Methods for further details.

### Files and variables

#### File: Nacre_TT_metadata.csv

**Description:** Specimen metadata for all spatial (*Haliotis* and *Nucula proxima*) and temporal (*Nucula proxima*) analyses. 

##### Variables

* Specimen_ID: Unique ID for each specimen
* Region: Geographic region where the specimen was collected
* Class: Class of marine mollusk
* Genus: Genus of marine mollusk
* Species: Species of marine mollusk
* Latitude: Latitude in decimal degrees for specimen location; NA denotes localities for which geographic coordinates were not shared to limit poaching of *Haliotis* populations
* Longitude: Longitude in decimal degrees for specimen locatio...,