Effects of density on lek-site selection by Black Grouse Tetrao tetrix in the Alps

Nelli, L. , Murru, M. and Meriggi, A. (2016) Effects of density on lek-site selection by Black Grouse Tetrao tetrix in the Alps. Bird Study, 63(2), pp. 187-195. (doi: 10.1080/00063657.2016.1180503)

Abstract

Capsule: The Black Grouse is a primarily lekking species, but low population density and lack of suitable habitat can lead to the establishment of non-lekking populations. Aims: To understand if differences in density could be related to differences in the lekking system, if there were differences in lek-site selection, and if there was a direct effect of habitat on the lek size. Methods: We compared lek sizes between two Black Grouse populations with different male population densities as estimated by distance sampling. We considered land-cover categories, landscape metrics and orographic variables and computed the Ivlev’s Electivity Index to evaluate habitat selection of males in the two study areas. A general linear model was used to assess the relationship between lek size and habitat variables. Results: We could not demonstrate the direct effect of density on the displaying behaviour but we found strongly different patterns of lek-site selection and different effects of habitat on lek size according to the population density. Conclusions: We concluded that habitat normally considered as high quality and habitat complexity may play different roles in selection by solitary versus lekking males when different population densities are considered.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Nelli, Dr Luca
• Authors: Nelli, L., Murru, M., and Meriggi, A.
• College/School: College of Medical Veterinary and Life Sciences > School of Biodiversity, One Health & Veterinary Medicine
• Journal Name: Bird Study
• Publisher: Taylor & Francis
• ISSN: 0006-3657
• ISSN (Online): 1944-6705
• Published Online: 13 May 2016
• Copyright Holders: Copyright © 2016 Taylor and Francis
• First Published: First published in Bird Study 63(2): 187-195
• Publisher Policy: Reproduced in accordance with the publisher copyright policy