Data and code from: Biogeographic patterns and drivers of endolithic symbiosis in mussels across Atlantic Europe and North Africa

This dataset includes the file infestationdata.RData, which provides records of mussel shell bioerosion, is stored in the column “infestation”. The degree of endolithic association was evaluated according to the classification in a previous study: Kaehler, S. (1999) Incidence and distribution of phototrophic shell-degrading endoliths of the brown mussel Perna perna. Mar. Biol., 135, 505-514. https://doi.org/10.1007/s002270050651 Shells with clean, intact periostracum and distinct periostracal striations (Group A); shells with central surface erosion, outer striations becoming indistinct (Group B); shells with erosion extending beyond the central portion, with grooves and pits appearing (Group C); shells heavily pitted, deformed, with almost completely absent periostracal striations (Group D); shells extremely pitted, brittle, and deformed, often with holes (Group E). For each mussel, the valve showing the highest level of endolithic bioerosion was used for classification. The ..., , # Data and code from: Biogeographic patterns and drivers of endolithic symbiosis in mussels across Atlantic Europe and North Africa

Dataset DOI: [10.5061/dryad.18931zd8g](10.5061/dryad.18931zd8g)

## Description of the data and file structure

## **Files**

* Endolithic Symbiosis in Intertidal Mussels.Rmd
* infestationdata.RData
* studysites.xlsx

## **Description**

**Endolithic_Symbiosis_in_Intertidal_Mussels.Rmd** – This file contains the R code
**infestationdata.RData** – This file contains endolith-induced bioerosion levels sampled at 14 sites: Goodref (UKG) and Croyde (UKC) both in September 2017, Wimereux (FRW) in October 2024, Luc sur Mer (FRL) in September 2024, Viana do Castelo (PTV) and Malhão (PTM) both in May 2011 and April 2019, Cascais (PTC) and Vilamura (PTL) both in May 2011, and Larache (MLA), Sidi Bouzid (MSB), Essaouira (MES), Mirleft (MMI), Tarfaya (MTF) and Dakhla (MDK) all in October 2014. Columns: time (year-month), site (see abbreviations above), size (musse..., ,