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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Comparing call-playback to an observation-only method to survey Grey Partridge Perdix perdix on hill farms in northern England (2018)
Auteurs :	Philip Warren, Auteur ; Tom Hornby, Auteur ; David Baines, Auteur
Type de document :	Article
Dans :	Bird Study (65(2) June, 2018)
Article en page(s) :	225-231
Résumé :	Capsule: Call-playback in spring can be a practical method to survey Grey Partridges Perdix perdix in rough grasslands with abundant cover. However, further research is required to investigate movements and other responses to call-playback.Aims: To compare call-playback with an observation-only method to survey Grey Partridges in rough grasslands with abundant cover, and to undertake a pilot study to consider whether bird behaviour conforms to point distance sampling assumptions.Methods: Grey Partridges were surveyed using two separate methods: call-playback and observation-only, at 10 equally spaced points along 14 independent 4 km routes at 3 study sites in northern England. Surveys were undertaken at dawn and dusk in spring (March and April) and again in summer (August and September).Results: In spring, call-playback registered at dusk fourfold and at dawn almost twice as many Grey Partridge encounters as the observation-only method. Methods did not differ in summer. In spring, using call-playback registered three times more encounters in rough grasslands with tall, dense cover than the observation-only method. Methods did not differ in summer. Grey Partridge encounter density estimates did not differ significantly between methods or seasons.Conclusion: Using call-playback in spring increased the numbers of Grey Partridge encounters and can be a practical survey method, but further research is required to compare results against known populations and to investigate movements and other responses to call-playback, which may violate distance sampling assumptions.
En ligne :	https://doi.org/10.1080/00063657.2018.1475466

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