The Pennsylvania grotto sculpin: population genetics

The Pennsylvania grotto sculpin is known from just two caves of the Nippenose Valley in central Pennsylvania, USA. They exhibit emergent troglobitic morphological traits and are the second northern-most cave adapted fish in the world. Two mitochondrial (16S rRNA and D-loop gene) and one nuclear (S7...

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Bibliographic Details
Published in:Subterranean Biology
Main Authors: Espinasa, Luis, Smith, Drake M., Lindquist, Julianna M.
Format: Article in Journal/Newspaper
Language:unknown
Published: Pensoft Publishers 2021
Subjects:
Cave
Cottidae
Cottus cognatus
Cottus bairdii
hybrid
Speciation
stygobite
troglobite
Grotto
Online Access:https://zenodo.org/record/4703486
https://doi.org/10.3897/subtbiol.38.60865
Description
Summary:The Pennsylvania grotto sculpin is known from just two caves of the Nippenose Valley in central Pennsylvania, USA. They exhibit emergent troglobitic morphological traits and are the second northern-most cave adapted fish in the world. Two mitochondrial (16S rRNA and D-loop gene) and one nuclear (S7 ribosomal protein gene intron) gene in both cave and epigean populations were sequenced. For the three markers, a large proportion of cave specimens possess unique haplotypes not found in their local surface counterparts, suggesting a vicariance in their evolutionary history. The cave population also has haplotypes from two separate lineages of surface sculpins of the Cottus cognatus/bairdii species complex. Since morphology, nuclear, and mitochondrial markers are not correlated among cave individuals, hybridization with introgression is suggested.

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