Data from: Curation: heat stress responses and population genetics of the kelp Laminaria digitata (Phaeophyceae) across latitudes reveal differentiation among North Atlantic populations ...

• Main Authors: Fouqueau, Louise, Liesner, Daniel, Valero, Myriam, Roleda, Michael, Pearson, Gareth, Bischof, Kai, Valentin, Klaus, Bartsch, Inka
• Format: Dataset
• Language: English
• Published: Dryad 2020
• Subjects: Laminaria digitata; Microsatellite genotyping; Arctic; Kongsfjord*; Kongsfjorden; North Atlantic; Spitsbergen
• Online Access: https://dx.doi.org/10.5061/dryad.jsxksn06c; https://datadryad.org/stash/dataset/doi:10.5061/dryad.jsxksn06c

We aim to understand the thermal plasticity of a coastal foundation species across its latitudinal distribution by assessing physiological responses to high temperature stress in the kelp Laminaria digitata in combination with population genetic characteristics. We hypothesize that Arctic and cold-temperate populations are less heat resilient than warm-temperate populations. Using meristems of natural L. digitata populations from six locations ranging between Kongsfjorden, Spitsbergen (79°N), and Quiberon, France (47°N), we performed a common-garden heat stress experiment applying 15°C to 23°C over eight days. We assessed growth, quantum yield, carbon and nitrogen storage, and xanthophyll pigment contents as response traits. Population connectivity and genetic diversity were analysed with microsatellite markers to relate heat resilience to genetic features and phylogeography. Microsatellite genotyping revealed all sampled populations to be genetically distinct, underlying strong hierarchical structuring ... : Genotype data The samples were collected during 2018/beginning of 2019 in all locations. At least 30 individuals were collected and genotyped for 12 markers. The acquisition of the genotype data are explained in the M&M section of the manuscript. ...