Sympatric speciation in the Simuluim arcticum complex (Diptera: Simuludae)

Five separate data
sets were included in our analyses: Alaska (Shields and Procunier 1982),
Montana, Idaho, and eastern Washington (Shields 2013; Shields 2014; Shields and
Shields 2017 and Shields, unpub. data); throughout the range of S. arcticum (Conflitti et al. 2016); western Canada (Procunier,
unpub.); and throughout the range of S.
arcticum (Adler et al. 2004.

Locations for 299 sites were determined with varying accuracy. There were 125 sites associated
with recent collections using GPS capture that have an accuracy of plus or minus 5
m. There were 90 legacy sites with good
location descriptions with coordinates captured with Google Earth that we are confident are within 1 km of the collection
location. Finally, 84 sites had poor location descriptions often listing only a
county. We used the centroid of the county location for these sites resulting
in a spatial accuracy of approximately 100 km. Both the GPS coordinates and the Google Earth capture location used the datum WGS 1984.

Locations for each site along
with associated sibling species and cytotypes were used to create an attribute
table.