Ecology of Aquatic Warblers Acrocephalus paludicola in a Fall Stopover Area on the Atlantic Coast of France
| Autor: | Sophie Bénard, Frédéric Jiguet, Raphaël Musseau, Valentine Herrmann, Thomas Herault, Christian Kerbiriou |
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| Přispěvatelé: | École supérieure du professorat et de l'éducation - Académie de Rouen (ESPE Rouen), Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Normandie Université (NU), Centre d'Ecologie et des Sciences de la COnservation (CESCO), Muséum national d'Histoire naturelle (MNHN)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Innovative Computing Laboratory [Knoxville] (ICL), The University of Tennessee [Knoxville], Conservation des espèces, Restauration et Suivi des Populations (CERSP), Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
0106 biological sciences
Biomass (ecology) Habitat fragmentation Ecology Foraging Endangered species Bulrush 15. Life on land Biology biology.organism_classification 010603 evolutionary biology 01 natural sciences 010605 ornithology Habitat Acrocephalus Animal Science and Zoology 14. Life underwater [SDE.BE]Environmental Sciences/Biodiversity and Ecology ComputingMilieux_MISCELLANEOUS Aquatic warbler |
| Zdroj: | Acta Ornithologica Acta Ornithologica, 2014, 49 (1), pp.93-105. ⟨10.3161/000164514X682922⟩ |
| DOI: | 10.3161/000164514X682922⟩ |
| Popis: | The Aquatic Warbler Acrocephalus paludicola is the only endangered songbird in continental Europe. This trans- Saharan migratory bird significantly transits along the French Atlantic coastline during post-breeding migration and the right bank of the Gironde estuary has been identified as an important stopover site. We studied the spatial occupancy strategies of stationing individuals during August of three successive years (2010-2012). We characterized habitat use by radio-tracking individuals revealing relatively small foraging ranges (6.6 ± 2.6 ha on average) with only 1 ha actually exploited (core area), and a relatively high habitat fragmentation rate. Capture-mark-recapture analyses assessed the average stopover duration of individuals and body-mass variations during their stopover. The estimated average stopover duration was 6.46 ± 0.46 days (95% confidence interval: 4.4-9.6). Lean birds tended to forage significantly more than stout birds: on average, they gain 2.81 ± 0.89% of their initial mass each day whereas stout birds only gain 0.12 ± 0.56%. Analyses of droppings characterized the local diet. We noticed that Aquatic Warbler preferentially used partially-flooded or flooded habitats with heterogeneous and rather low vegetation, such as bulrush beds or bulrush beds mixed with reed beds. Orthoptera, Araneae and Hymenoptera represented the largest contributions to the con- sumed biomass (64.7%, 13.4% and 8.9% respectively). The importance of the fuel deposition rate of lean birds reflects the importance of the estuary as a stopover site for the species. It means that the available resources allow birds to replenish and continue their migration route. However, the sustainability of the site's functionality is questioned because of the evolution of habitats (erosion, rise in water levels and changes in food web). |
| Databáze: | OpenAIRE |
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