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Nests, threats and leks: non-random distribution of nests in ruffs (Calidris pugnax)
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  • Hanna Algora,
  • James Tolliver,
  • Veli-Matti Pakanen,
  • Krisztina Kupán,
  • Jelena Belojević,
  • Nelli Rönkä,
  • Clemens Küpper,
  • Kari Koivula
Hanna Algora
University of Oulu Faculty of Science

Corresponding Author:[email protected]

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James Tolliver
Max Planck Institute for Biological Intelligence
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Veli-Matti Pakanen
University of Oulu Faculty of Science
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Krisztina Kupán
Max Planck Institute for Biological Intelligence
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Jelena Belojević
University of Oulu Faculty of Science
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Nelli Rönkä
Oulun Yliopisto Luonnontieteellinen Tiedekunta
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Clemens Küpper
Max Planck Institute for Biological Intelligence
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Kari Koivula
University of Oulu Faculty of Science
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Abstract

Habitat selection determines an animal’s spatial distribution at various scales. In ground breeding birds, selecting the right nesting location can be decisive for the survival of parents and offspring. Ruffs (Calidris pugnax) are waders with highly divergent sex roles that frequently breed in coastal wetlands of higher latitudes where they often face the threat of flooding and predation. Males aggregate for competitive display to attract females (reeves), who then care for the nest and offspring alone. We investigated which environmental and social cues relate to nest distributions in this threatened wader species. Using nest and lek locations from five breeding seasons we tested whether Ruff nests are randomly distributed across suitable breeding habitat or show some level of aggregation. We then assessed whether leks and nests are spatially associated, i.e., nests are closer located to leks than expected by chance. Finally, we examined whether reeves consider distance to shoreline and meadow edges, two habitat features that are linked to threats such as flooding and predation, for the choice of their nest location. Our results show that nest distribution is non-random, and nests are found closer to leks and other nests than expected by chance. We found nests further away from the meadow edges and shores than expected by chance suggesting that nesting females try to minimize the risk of predation and flooding. We suggest that understanding the social and environmental factors affecting female nest choice can help to improve the management and conservation routines at the breeding sites of these threatened waders. Our results indicate that lekking sites can be used to recognise areas of conservation and management value.
07 Aug 2024Submitted to Ecology and Evolution
08 Aug 2024Submission Checks Completed
08 Aug 2024Assigned to Editor
12 Aug 2024Reviewer(s) Assigned
26 Aug 2024Review(s) Completed, Editorial Evaluation Pending
18 Sep 2024Editorial Decision: Revise Minor