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Optimal stopover model: A state-dependent habitat selection model for staging passerines.

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Migrating birds must choose between staying at low-quality stopover sites or moving. Leaner birds are forced to stay, risking their migration success, while healthier birds can seek better resources.

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Area of Science:

  • Ecology
  • Behavioral Ecology
  • Conservation Biology

Background:

  • Migratory birds rely on stopover sites of varying quality for refueling.
  • Limited environmental information can lead birds to low-quality sites with low fuel deposition rates (FDR).
  • Decisions at stopover sites depend on a bird's body condition and the site's quality.

Purpose of the Study:

  • To model the decision-making process of passerines at stopover sites of varying quality before crossing a major ecological barrier.
  • To understand how body condition influences habitat selection and movement between sites.
  • To determine optimal strategies for maximizing fuel load for migration.

Main Methods:

  • Developed a state-dependent habitat selection model for migrating birds.
  • Incorporated empirical data from Blackcaps (Sylvia atricapilla) during autumn migration in Israel.
  • Modelled the trade-offs between staying at a low-quality site versus the energetic costs of moving to a higher-quality site.

Main Results:

  • The optimal strategy at a low-quality site is rapid departure, if possible.
  • Birds in poor body condition cannot afford to move and must remain at suboptimal sites.
  • This leads to reduced chances of successful migration for leaner individuals.

Conclusions:

  • A bird's body condition is critical for deciding whether to move between stopover sites.
  • The model highlights the importance of FDR as an indicator of stopover site quality.
  • Findings can inform targeted conservation and management of crucial migratory stopover habitats.