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Extracting reproductive parameters from GPS tracking data -- a new tool for a nesting raptor in Europe
  • +4
  • Steffen Oppel,
  • Ursin Beeli,
  • Martin Grüebler,
  • Valentijn van Bergen,
  • Martin Kolbe,
  • Thomas Pfeiffer,
  • Patrick Scherler
Steffen Oppel
Schweizerische Vogelwarte

Corresponding Author:[email protected]

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Ursin Beeli
Schweizerische Vogelwarte
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Martin Grüebler
Swiss Ornithological Institute
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Valentijn van Bergen
Swiss Ornithological Institute
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Martin Kolbe
Rotmilanzentrum
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Thomas Pfeiffer
Rosenweg 1
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Patrick Scherler
Swiss Ornithological Institute
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Abstract

Understanding population dynamics requires estimation of demographic parameters like mortality and productivity. Because obtaining the necessary data for such parameters can be labour-intensive in the field, alternative approaches that estimate demographic parameters from existing data can be useful. High-resolution biologging data are now frequently available for large-bodied bird species, and can be used to estimate survival and productivity. We build on existing approaches to develop a new tool (‘NestTool’) that uses GPS tracking data at hourly resolution to estimate important productivity parameters such as territory acquisition, breeding propensity and breeding success. We developed NestTool with data from 258 individual red kites (Milvus milvus) from Switzerland tracked for up to 7 years. NestTool first extracts 42 movement metrics such as time within a user-specified radius, number of revisits, home range size, and distances between most frequently used day and night locations from the raw tracking data for each individual breeding season. These variables are then used in three successive random forest models to predict whether individuals exhibited home range behaviour, initiated a nesting attempt, and successfully raised fledglings. The models achieved > 95% accurate classification of home range and nesting behaviour in cross-validation data, but slightly lower (> 80%) accuracy in classifying the outcome of nesting attempts, because some individuals frequently returned to nests despite having failed. NestTool provides a graphical user interface to manually annotate those individual seasons for which model predictions fall below a user-defined threshold of certainty. When applied to tracking data from different red kite populations in Germany, NestTool yielded accurate predictions with > 80% accuracy in all parameters. NestTool is available as R package at https://github.com/Vogelwarte/NestTool and we encourage ornithologists to adapt it for different populations and species. NestTool will facilitate the more widespread estimation of demographic parameters from tracking data to inform population assessments
30 Oct 2023Submitted to Journal of Avian Biology
30 Oct 2023Submission Checks Completed
30 Oct 2023Assigned to Editor
30 Oct 2023Review(s) Completed, Editorial Evaluation Pending
05 Nov 2023Reviewer(s) Assigned
23 Feb 2024Editorial Decision: Revise Major
15 May 2024Reviewer(s) Assigned
10 Jun 2024Review(s) Completed, Editorial Evaluation Pending
13 Aug 20242nd Revision Received
13 Aug 2024Submission Checks Completed
13 Aug 2024Assigned to Editor
13 Aug 2024Review(s) Completed, Editorial Evaluation Pending
28 Aug 2024Editorial Decision: Accept