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<p>Trait-based frameworks often overestimate population connectivity in crayfishes because of the assumption of terrestrial dispersal, which varies depending on burrowing habits. We hypothesized contrasting burrowing traits influence genetic structure because traits are linked to habitat requirements, thus population distribution. We compared population genetic structure of two sympatric crayfishes in upland streams of the Bankhead National Forest, Alabama, <i>Cambarus striatus</i>, a secondary burrower and common inhabitant of intermittent streams, and <i>Faxonius validus</i>, a tertiary burrower and common inhabitant of perennial streams. We quantified populations at 15 sites across four drainages (Sipsey Fork, Brushy Creek, Flint Creek, and Bear Creek) in two major basins (Mobile and Tennessee rivers). Most genetic variation (82%) in <i>F. validus</i> occurred between drainages with a positive correlation between genetic and stream distance. In contrast, most genetic variation (54.5%) in <i>C. striatus</i> occurred within populations with no correlation between genetic and stream distance. Spatial patterns of genetic diversity for <i>F. validus</i> and <i>C. striatus</i> resemble the Stream Hierarchy and Panmictic models, respectively. These results suggest that burrowing traits of crayfishes, which may determine their ability to occupy intermittent upper reaches of streams, may be a useful heuristic for predicting their population structure.</p>

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Contrasting patterns of population structure in sympatric crayfishes with different burrowing strategies

  • 期刊论文

  • 发表日期：

    2026年8月4日

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  • Eric F. Bauer,
  • Scott R. Santos,
  • Jack W. Feminella,
  • Brian S. Helms

摘要

Trait-based frameworks often overestimate population connectivity in crayfishes because of the assumption of terrestrial dispersal, which varies depending on burrowing habits. We hypothesized contrasting burrowing traits influence genetic structure because traits are linked to habitat requirements, thus population distribution. We compared population genetic structure of two sympatric crayfishes in upland streams of the Bankhead National Forest, Alabama, Cambarus striatus, a secondary burrower and common inhabitant of intermittent streams, and Faxonius validus, a tertiary burrower and common inhabitant of perennial streams. We quantified populations at 15 sites across four drainages (Sipsey Fork, Brushy Creek, Flint Creek, and Bear Creek) in two major basins (Mobile and Tennessee rivers). Most genetic variation (82%) in F. validus occurred between drainages with a positive correlation between genetic and stream distance. In contrast, most genetic variation (54.5%) in C. striatus occurred within populations with no correlation between genetic and stream distance. Spatial patterns of genetic diversity for F. validus and C. striatus resemble the Stream Hierarchy and Panmictic models, respectively. These results suggest that burrowing traits of crayfishes, which may determine their ability to occupy intermittent upper reaches of streams, may be a useful heuristic for predicting their population structure.