DOI: 10.5061/dryad.6hdr7srck
title: Data from: Shell dissolution rates differ fourfold between mussel species

description: Marine mussels display differential habitat preferences, with species like
 Mytilus californianus favoring fully saline environments and Mytilus
 trossulus inhabiting sites with greater freshwater input. Determining
 abiotic dissolution rates of these species under ocean acidification is
 essential for predicting future consequences of climate change for coastal
 populations. We examined shell dissolution rates of these congeners under
 a range of pH (6.5-9.3) and aragonite saturation states (0.1-9.0). We
 additionally quantified experimentally the relative importance of
 dissolution from interior versus exterior shell surfaces. M. trossulus
 exhibited 4x higher shell dissolution rates than M. californianus. When
 the shell interior was sealed against seawater exposure, dissolution rates
 decreased significantly in both species, indicating high abiotic
 dissolution on the shell interior. Results demonstrate that dissolution
 rates can vary between congeners inhabiting the same biogeographic region.
 Our finding that freshwater-tolerant M. trossulus has higher abiotic
 dissolution under ocean acidification is important because low salinity
 may further retard calcification, altering future intertidal population
 structure along freshwater-influenced coastlines.
description: # Data from: Shell dissolution rates differ fourfold between mussel
 species Dataset DOI: [10.5061/dryad.6hdr7srck](10.5061/dryad.6hdr7srck) ##
 Description of the data and file structure Abiotic dissolution in sealed
 and unsealed interior shells of *Mytilus trossulus* and *Mytilus
 californianus*. ## Files and variables #### File:
 abiotic_dissolution_Mtrossulus_Mcalifornianus.csv **Description:** We
 measured abiotic dissolution in sealed and unsealed interior shells of
 *Mytilus trossulus* and *Mytilus californianus*. *Mytilus trossulus* and
 *Mytilus californianus* shells were exposed to a range of pH values
 (6.5–9.3) and aragonite saturation states (Ωₐ = 0.1–9.0). To assess the
 relative contribution of the inner and outer shell layers to dissolution,
 both sealed and unsealed shells were tested. ##### Variables *
 *shell.number*: unique ID assigned to each shell for tracking purposes *
 *treatment*: Unpainted shells were labeled as shell.trossulus or
 shell.californianus, depending on species. Painted shells were labeled as
 shell.trossulus.painted or shell.californianus.painted  * *G*: rate of
 abiotic dissolution (umol/hr/g) * *OmegaAragonite*: Aragonite saturation
 calculated with seacarb in R * *duration*: length of incubation time
 (hours) * *shell.wt*: weight of shell (g) * *shell.length*: length of
 shell (mm) ## Code/software #### File: abiotic_dissolution_analysis.R
 **Code/Software Description:** The R analysis code is
 abiotic_dissolution_analysis.R and can be used to generate the statistics
 and figures in our manuscript. We used R v 4.5.0. Necessary packages are
 listed in the code: tidyverse, sf, purrr, ggplot2, car, rcompanion.  ##
 Access information Other publicly accessible locations of the data: *
 [https://github.com/rrcarlson/trossulus](https://github.com/rrcarlson/trossulus) Data was derived from the following sources: * Saley A, Gaylord B. Lab incubations of mussels (Mytilus californianus) examining the influence of periostracum cover and pH on external shell dissolution at Marshall Gulch Beach, CA from August 2021 to March 2022 [[http://lod.bco-dmo.org/id/dataset/935476](http://lod.bco-dmo.org/id/dataset/935476)]. Version 1. Woods Hole (MA): Biological and Chemical Oceanography Data Management Office (BCO-DMO); 2024 Dec 28.[ https://doi.org/10.26008/1912/bco-dmo.935476.1](https://doi.org/10.26008/1912/bco-dmo.935476.1)