Phylogenetics

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     The genus Coryphaenoidesis a diverse group of deep demersal fishes that is comprised of 66 recognized species. Recent phylogenies indicate deep evolutionary divisions among species that correlate with depth (abyssal vs those that live above 4000 m; Wilson et al. 1991, Morita 1999, White et al. 2011). Earlier studies identified at least two genes that may be associated with adaptation to depth abyssal depths including the LDH gene (Wilson et al. 1991, White et al. 2011) and the myosin heavy chain proteins (Morita 2008). Comparative assessments of these loci and those identified as potentially under selection using the RADSeq technique (see Population Genomics) will be undertaken to test hypotheses about how environmental factors contribute to speciation in this diverse genus. Multiple environmental characteristics will be assessed for possible correlation, and trees based on protein sequences will be compared with those based on synonymous sites and separate neutral genes.

 

 


References
Morita T (1999) Molecular phylogenetic relationships of the deep-sea fish genus Coryphaenoides (Gadiformes: Macrouridae)
based on mitochondrial DNA. Mol. Phylog. Evol. 13, 447-454.
Morita T (2008) Comparative sequence analysis of myosin heavy chain proteins from congeneric shallow- and deep-living
rattail fish (genus Coryphaenoides). J. Exp. Biol. 211, 1362-1367.
White TA, Fotherby H & Hoelzel AR (2011) Comparative assessment of population genetics and demographic history of two
congeneric deep sea fish species living at different depths. Mar. Ecol. Prog. Series 434, 155-164.
Wilson RR, Siebenaller JF, Davis BJ (1991) Phylogenetic analysis of species of 3 subgenera of Coryphaenoides (Teleostei,
Macrouridae) by peptide-mapping of homologs of LDH-A4. Biochem. Syst. & Ecol. 19, 277-287.