Ancient spotted bat DNA gives researchers a genetic record from centuries before modern surveys, but the available Colorado Plateau study summary does not establish a specific change in the species’ present-day population. It describes a comparison of recent, museum and mummy samples that can extend research into genetic diversity and population history.
What the Colorado Plateau study examined
The spotted bat, Euderma maculatum, is the subject of a 2015 conference abstract titled “Two thousand years on the Colorado Plateau: Spotted bat genetic diversity revealed by contemporary, historical, and ancient DNA”. The summary reports 118 samples drawn from recent collections, museum specimens and mummies. The researchers analyzed mitochondrial control-region markers.
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Two mummy specimens were reported as 2,084 and 1,336 years before present. Those dates refer to the specimens; they are not estimates of when the species or an entire spotted bat population originated.
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Comparing genetic material from different periods can give researchers a longer view than modern samples alone. Ancient specimens may help researchers investigate genetic diversity and population history by showing which genetic variants were present in the past and how they compare with more recent material.
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However, the available conference summary does not report enough full results to determine exactly how the mummy specimens alter estimates of present-day population size, diversity or change. It does not support a specific direction of change or detailed population estimate. The 118-sample total describes the study’s combined sample collection, not a present-day population count.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.A separate study traced spotted bat history across its range
A different study, published in 2023, considered the spotted bat’s range-wide history rather than reporting results from the Colorado Plateau mummy samples. Sanchez and colleagues combined ecological niche modeling with mitochondrial DNA analyses. Their ecological niche model supported Mexico as much of the species’ Pleistocene-era range, while haplotype patterns and Bayesian Skyline plots were consistent with expansion from the southwestern United States during the Holocene.
The authors also found that phylogenies produced by different methods did not align, preventing a precise reconstruction of colonization history. Their demographic analysis included 27 E. maculatum individuals. These findings are from the separate range-wide study and should not be attributed to the Colorado Plateau ancient-sample work.
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What the evidence can—and cannot—tell us
- Established by the Colorado Plateau summary: the study combined recent, museum and mummy material, analyzed mitochondrial control-region markers, and included two mummies dated to 2,084 and 1,336 years before present.
- Useful implication: samples spanning those sources and time periods can extend the genetic record available for studying spotted bat diversity and history.
- Not established in the available summary: a quantified change in present-day population dynamics, a population trend, or a detailed estimate derived from the mummy DNA.
- Separate range-wide finding: the 2023 study supports a broad historical pattern involving Mexico, the southwestern United States and Holocene expansion, but does not resolve colonization precisely.
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