Tämä on vanha versio, joka on julkaistu 2024-11-19. Katso uusin versio.
Tulossa

Effects of predation pressure and nest-site selection on the breeding success of terns in a Finnish archipelago

Kirjoittajat

  • Enzo DEGOT Université de Lyon, UCBL, ENSL, CNRS, UMR 5276 LGL-TPE, 69622 Villeurbanne, France
  • Ralf Wistbacka
  • Konsta Kaasalainen Ecology and Genetics Research Unit, University of Oulu
  • Aleksi Lehikoinen Helsinki Lab of Ornithology, LUOMUS - Finnish Museum of Natural History, University of Helsinki
  • Laura Bosco Helsinki Lab of Ornithology, LUOMUS - Finnish Museum of Natural History, University of Helsinki

Avainsanat:

Common Tern, Arctic Tern, conservation, hatching success, fledging success, nest-site selection, nesting habitat, predation, seabirds

Abstrakti

Studying and quantifying the breeding success of species can help to understand population trends and provide conservation guidance. Here, we studied the breeding success of Arctic Tern (Sterna paradisaea) and Common Tern (Sterna hirundo) colonies in a Natura 2000 site of the Western archipelago of Finland aiming to understand which factors related to nest-site selection and predation pressure best explain breeding success. We monitored 72 tern nests at 4 colonies and observed them during standardized monitoring sessions to record predation attacks on the tern nests. We ran generalized linear models to determine the factors which impact breeding success (hatching and fledging success). Hatching success was high across the 4 colonies with 69% of the eggs hatching, whereas fledging success was low with only 1 colony producing 14 fledglings while all other colonies had zero fledglings surviving (12% total fledging success). Regarding nest-site selection, our results demonstrate that a greater proportion of vegetation cover increases breeding success, likely through better nest concealment against predators. Nests in smaller colonies with a higher nest density and located closer to the colony center also produced more hatchlings and fledglings. Most predation likely happened during the chick stage, while our extrapolation predicted that predation accounts for at least 94% of all chick losses, indicating that predator control would aid breeding success of tern colonies in West Finland substantially.

Osasto
Artikkelit

Julkaistu

2024-11-19

Versiot

Viittaaminen

Degot, E., Wistbacka, R., Kaasalainen, K., Lehikoinen, A., & Bosco, L. (2024). Effects of predation pressure and nest-site selection on the breeding success of terns in a Finnish archipelago. Ornis Fennica, 00–00. https://doi.org/10.51812/of.145291