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Utilizing vmTracking to Improve the Accuracy of Multi-Animal Pose Estimation in Rodent Social Behavior Studies
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Movement patterns in a partial migrant: a multi-event capture-recapture approach.

Marie-Lucile Gourlay-Larour1, Roger Pradel2, Matthieu Guillemain3

  • 1Office National de la Chasse et de la Faune Sauvage, Nantes, France; Université Nantes Angers Le Mans, Nantes, France; Ecole Nationale Vétérinaire Agroalimentaire et de l'Alimentation Nantes-Atlantique, Oniris, Nantes, France.

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Summary

Partial migration in Common pochards involves some birds breeding locally and others migrating. Understanding these complex movement patterns is key for effective wildlife management and population dynamics.

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Area of Science:

  • Ecology
  • Conservation Biology
  • Wildlife Management

Background:

  • Partial migration, where some individuals migrate and others remain residents, significantly impacts population dynamics and seasonal variations.
  • Understanding these movements is crucial for effective wildlife management, yet it remains poorly studied.

Purpose of the Study:

  • To assess seasonal site occupancy, survival, and site fidelity of the partially migratory Common pochard (Aythya ferina).
  • To investigate the applicability of the multi-event capture-mark-recapture/recovery (CMR) approach for studying complex movement patterns in partial migrants.

Main Methods:

  • Utilized a multi-event capture-mark-recapture/recovery (CMR) approach to analyze data from Common pochards.
  • Modeled seasonal site occupancy, survival, and site fidelity to differentiate between resident and migratory individuals.

Main Results:

  • Discriminated two categories: locally breeding females (41% winter presence, high site fidelity) and winter visitors (nil breeding season presence for adults, 11% for young).
  • Wintering individuals showed high site fidelity (41-43%) between winters. Annual survival rates differed by age (adults 0.69, young 0.56), with higher mortality in late winter/early spring.
  • Demonstrated the utility of the multi-event approach for studying partial migration and overcoming state uncertainty.

Conclusions:

  • The multi-event CMR approach effectively investigates complex movement patterns in partial migrants, aiding in understanding seasonal population fluctuations.
  • Findings highlight the importance of studying individual presence and movement probabilities for effective conservation and management of partially migratory species.