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Simulated Mars missions in Iceland reveal that life detection assays vary in effectiveness across different spatial scales. Careful selection of assays and sampling strategies is crucial for maximizing scientific return in planetary exploration.

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Area of Science:

  • Astrobiology
  • Planetary Science
  • Microbiology

Background:

  • Analog sampling expeditions are vital for simulating planetary exploration conditions.
  • Understanding biomarker detection variability is key for successful extraterrestrial life detection.
  • Basaltic tephra environments in Iceland provide realistic analogs for Mars mission planning.

Purpose of the Study:

  • To assess the spatial representativeness of different biomarker assays under simulated mission constraints.
  • To evaluate the impact of sampling scale on the reliability of life detection methods.
  • To inform the selection of optimal sampling strategies for future astrobiological missions.

Main Methods:

  • Conducted analog sampling in Icelandic lava fields (Eldfell and Fimmvörðuháls).
  • Utilized three biomarker assays: cell counting, adenosine triphosphate (ATP) assay, and quantitative polymerase chain reaction (qPCR).
  • Analyzed assay performance across four nested spatial scales (1m to >1km) using statistical representativeness metrics.

Main Results:

  • Bioluminescence and bacterial/archaeal qPCR assays showed high variance and were not representative at the 1m scale.
  • Cell concentration and fungal DNA detection exhibited local variation but were homogeneous at scales >1km.
  • Assay performance and spatial representativeness varied significantly, highlighting interdependence of methods and sampling design.

Conclusions:

  • The choice of life detection assays and sampling strategy significantly impacts results in low-biomass environments.
  • A multi-assay approach and consideration of spatial scales are necessary for robust biomarker detection.
  • Optimizing sampling site selection and assay interdependence is critical for maximizing science return in planetary exploration.