Overview

This dataset is focused on the King scallop, Pecten maximus. This species is heavily fished and used in aquaculture, so is important from an economic and fishery perspective. As such, there’s been a fair amount of work on this species to understand their genetic structure, local adaptation, and so on. There’s also a nice, chromosome level genome assembly.

As adults, scallops don’t move much, but they have a long pelagic larval stage (up to a month). Despite this, there’s strong evidence for local adaptation, particularly to temperature.

In this dataset, Hollenbeck et al., looked at populations spanning the Norwegian Trench and across a fairly large latitudinal gradient. See the map below for sampling locations.


Map of sampling. The red line shows the location of the Norwegian Trench


In this study, the authors know from previous work that there is a population break across the Norwegian Trench. They further hypothesize that there is local adaptation to temperature, particularly in Spain, where temperatures are much warmer and represents the southern edge of the species’ distribution.

ddRAD was used to genotype individuals and reads were mapped to the reference genome and SNPs called with freebayes.

Sampling locations

Here are the sampling locations and number of individuals from each site.


Site Site Code Latitude Longitude N
Spain ESP 42.561 -8.949 19
Southwest Scotland SW 56.088 -6.504 15
Southeast Scotland SE 56.766 -1.670 29
Northeast Scotland NE 58.035 -2.834 31
Northwest Scotland NW 58.091 -5.889 32
Shetland Islands SLD 60.442 -0.659 35
Southern Norway SNO 60.900 4.043 20
North-central Norway NNO 65.241 10.195 20


Files


The vcf file for this dataset is located: shared_materials/Project_files/dataset_3/dataset3.vcf

Id and population of each individual: shared_materials/Project_files/dataset_3/id_pops.txt

Sampling locations: shared_materials/Project_files/dataset_3/dataset3_coords.csv

Site mean temperature: shared_materials/Project_files/dataset_3/dataset3_mean_temps.txt