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Related Experiment Video

Updated: Jan 15, 2026

Recording Mouse Ultrasonic Vocalizations to Evaluate Social Communication
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Decoding Owl Calls: Refining Occupancy Inference From Passive Acoustic Monitoring.

Natalie M Rugg1,2, Cara L Appel1,2, Julianna M A Jenkins1

  • 1Pacific Northwest Research Station USDA Forest Service Corvallis Oregon USA.

Ecology and Evolution
|October 13, 2025
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Summary
This summary is machine-generated.

Northern spotted owls use vocalizations for territory defense, but these calls indicate high-use areas, not entire home ranges. Understanding vocal behavior improves passive acoustic monitoring for conservation and habitat management.

Keywords:
interpretationnorthern spotted owlpassive acoustic monitoringspace usespecies detectionterritorial behaviorvocalization patterns

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Area of Science:

  • Ecology
  • Bioacoustics
  • Conservation Biology

Background:

  • Territorial species often use vocalizations for defense, but defended areas may differ from home ranges.
  • Passive acoustic monitoring is increasingly used for population assessment, necessitating refined understanding of species-specific space use.
  • Northern spotted owls vocalize during breeding, but female detectability and interference from barred owls complicate acoustic data interpretation.

Purpose of the Study:

  • To quantify northern spotted owl vocal activity in relation to sex, reproductive status, landscape features, and barred owl presence.
  • To refine the interpretation of acoustic data for northern spotted owl occupancy estimation and conservation.
  • To develop a detection-based framework for inferring occupancy from passive acoustic monitoring data.

Main Methods:

  • Deployed autonomous recording units near northern spotted owl activity centers to record vocalizations.
  • Quantified vocal activity, considering sex, reproductive status, landscape, and interspecific competition (barred owls).
  • Compared detections from overlapping monitoring sites to assess detectability and refine space use estimations.

Main Results:

  • Male northern spotted owl calls were detected more frequently and consistently than female calls.
  • Female calls were infrequent and concentrated near activity centers, especially when nesting.
  • Acoustically inferred vocal space use areas were smaller than published home ranges, indicating high-use zones.

Conclusions:

  • Vocalizations represent high-use areas, not total spatial use, for northern spotted owls.
  • A detection-based spectrum of weeks with detection can improve occupancy inference by accounting for calling rate and sex.
  • Nuanced, objective-based thresholds for interpreting acoustic data are crucial for accurate population assessment and effective habitat protection.