Spatially varying selection amplifies intrapopulation differentiation among phenotypic traits in the rocky-shore mussel, Mytilus californianus

Strong ecological gradients along heterogeneous environments play an important role in shaping population differentiation across species ranges. Thus, the selective pressure of environmental variation on phenotypic variation strongly affects an organism’s ability to persist across diverse or new environments. We investigated the spatial variability of biological responses in the intertidal bivalve Mytilus californianus to highlight the costs and trade-offs of local adaptation and phenotypic plasticity across various functional traits in a dynamic environment, the marine intertidal. To test this, we performed a reciprocal transplant experiment with M. californianus individuals originating from the upper and lower intertidal measuring relevant phenotypic traits, followed by Whole Genome Sequencing (WGS). We determined that morphological traits in individuals demonstrated increased phenotypic plasticity when moved to new environments, whereas physiological traits such as metabolism had red..., , # Spatially varying selection amplifies intrapopulation differentiation among phenotypic traits in the rocky-shore mussel, Mytilus californianus

Dataset DOI: [10.5061/dryad.pnvx0k70n](10.5061/dryad.pnvx0k70n)

## Description of the data and file structure

Data was generated from reciprocal transplant experiments combined with next generation sequencing to identify intrapopulation genetic and phenotypic variation between *M. californianus* individuals positioned in the low and high intertidal.

### Files and variables

#### File: rec_tran_hobo_dat.csv

**Description:** Temperature measurements were recorded in 5-minute intervals throughout the entire experimental period for both intertidal plots using Onset HOBO data loggers that were attached to anchored screw eyes positioned next to the experimental enclosures.

**Variables**

* Locale: Spatial position of hobo logger in the marine intertidal
* date: Date
* temp: Temperature in Celsius
* light: Amount of light detected from hobo logg...,