We are using genetic tools to clarify the identity and relationships among species. These include phylogenetic trees based on genetic sequences. Please see below for links to tree files in various formats.
Figure 1. The maximum-likelihood phylogeny of Cottus based on concatenated mitochondrial and nuclear sequences of the four-gene dataset. This is the base file for Figure 4 in Young et al. (2022). This is a viewable PDF.
Figure 2. A neighbor-joining tree of COI sequences (n = 4,266) from this study and public databases used to diagnose candidate species. This is the base file for SupplementalFigure 5 in Young et al. (2022). The label for each sequence reads “CNN-FNN-NNNN Location” for which CNN is the candidate species label, FNN is the form label, NNNN is the specimen code, and Location is the water body name and state, province, or country. These labels and codes are available in the Excel file on this website, or from Supplemental File 2 in Young et al. (2022; shown below). This is a tree file in NWK format that can be opened in a variety of tree-reading programs.
Figure 3. A neighbor-joining tree of cytb sequences (n = 1,152) from this study and public databases used to diagnose candidate species. This is the base file for SupplementalFigure 6 in Young et al. (2022). The label for each sequence reads “CNN-FNN-NNNN Location” for which CNN is the candidate species label, FNN is the form label, NNNN is the specimen code, and Location is the water body name and state, province, or country. These labels and codes are available in the Excel file on this website, or from Supplemental File 2 in Young et al. (2022; shown below). This is a tree file in NWK format that can be opened in a variety of tree-reading programs.
For further details, you can download the publication and supplemental materials describing this work from TreeSearch: Young, Michael K.; Smith, Rebecca; Pilgrim, Kristine L.; Isaak, Daniel J.; McKelvey, Kevin S.; Parkes, Sharon; Egge, Jacob; Schwartz, Michael K. 2022. A molecular taxonomy of Cottus in western North America. Western North American Naturalist 82(2): 307-345. https://doi.org/10.3398/064.082.0208