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Journal of Ornithology

, Volume 155, Issue 1, pp 183–194 | Cite as

The winter roosting and diet of Black Grouse Tetrao tetrix in the north-western Italian Alps

  • Massimo Bocca
  • Enrico CaprioEmail author
  • Dan Chamberlain
  • Antonio Rolando
Original Article

Abstract

The factors influencing the selection of Black Grouse Tetrao tetrix winter roost sites and choice of roosting strategy (open-air roosts vs. snow burrows, or ‘igloos’) were assessed in the Alps, including the influence of winter diet, snow conditions and habitat at different scales. Of 337 roosts detected, 31 % were igloos and 69 % were open-air roosts. At the larger scale (30 × 30 m), ground curvature, altitude, slope, southerly aspect and mountain pine Pinus montana uncinata cover were positively correlated with roost presence. At the smaller scale (10 m radius), roost presence was positively correlated with a northerly aspect, cover of green alder Alnus viridis, and a low cover of vegetation downslope from the roost. Roosting strategy was related to temperature and snow conditions (with more igloos when snow depth was greater, but fewer igloos when a hard snow crust had formed). The winter diet of the Black Grouse mostly comprised mountain pine needles (84 % of droppings). The results suggest that a range of factors influence choice of roost site, including predator avoidance, food availability and topography. The latter showed contrasting effects at different scales, suggesting that Black Grouse select colder sites (with deeper snow) within warmer areas (energetically more favourable). Management to encourage the mountain pine, whilst maintaining scattered green alder in the understorey, is likely to improve Black Grouse winter habitat quality. Choice of roosting strategy is, however, dictated by weather conditions. If the reduction in precipitation and snow cover continues as forecast, open-air roosting might be more frequent in the future. However, open-air roosting might increase predation risk, which could be deleterious for the species’ conservation.

Keywords

Black Grouse Diet Habitat selection Landscape selection Roosting strategies Snow conditions 

Zusammenfassung

Winterschlafplätze und Winternahrung von Birkhühnern Tetrao tetrix in den nordwestlichen italienischen Alpen

Wir untersuchten die Faktoren, welche im Winter die Schlafplatzwahl und die Übernachtungsstrategie (unter freiem Himmel beziehungsweise in Schneehöhlen oder “Iglus”) bei Birkhühnern Tetrao tetrix in den Alpen bestimmen, darunter den Einfluss von Winternahrung, Schneebedingungen und Habitat auf verschiedenen Ebenen. Von 337 gefundenen Schlafplätzen waren 31 % Iglus und 69 % befanden sich unter freiem Himmel. Auf der höheren Habitatebene (30 × 30 m) korrelierten Bodenunebenheit, Höhenlage, Hangneigung, Ausrichtung nach Süden und der Bewuchs mit Bergkiefer Pinus montana uncinata positiv mit dem Auftreten von Schlafplätzen. Auf der niedrigeren Habitatebene (10 m Radius) korrelierte das Vorhandensein von Schlafplätzen positiv mit der Ausrichtung nach Norden, dem Bewuchs mit Grünerle Alnus viridis und einer niedrigen Vegetationshöhe hangabwärts vom Schlafplatz. Die Strategie bei der Schlafplatzwahl hing von der Temperatur und den Schneeverhältnissen ab (mehr Iglus bei dickerer Schneedecke, aber weniger Iglus, wo sich eine harte Schneekruste gebildet hatte). Die Winternahrung der Birkhühner beinhaltete überwiegend Bergkiefernnadeln (84 % der Kotproben). Die Ergebnisse legen nahe, dass eine ganze Reihe von Faktoren eine Rolle bei der Schlafplatzwahl spielt, darunter Prädationsvermeidung, Nahrungsverfügbarkeit und die Geländetopografie. Letztere zeigte gegenteilige Auswirkungen auf den verschiedenen Habitatebenen, was nahelegt, dass Birkhühner kältere Stellen (mit tieferem Schnee) innerhalb wärmerer Bereiche (die energetisch günstiger sind) bevorzugen. Eine Bewirtschaftung, welche die Bergkiefern fördert, aber gleichzeitig verstreute Grünerlen im Unterwuchs erhält, würde vermutlich die Winterhabitatqualität für die Birkhühner verbessern. Allerdings wird die Übernachtungsstrategie von den Wetterverhältnissen bestimmt. Falls der Rückgang in Niederschlägen und Schneedecke wie erwartet fortschreitet, könnten Schlafplätze unter freiem Himmel zukünftig häufiger werden. Allerdings könnten solche offenen Schlafplätze das Prädationsrisiko erhöhen, was für den Erhalt der Art nachteilig sein könnte.

Notes

Acknowledgments

We are very grateful to C. Bich, M. Galli, G. Leonelli, S. Vuillermoz and the Park guards for help in data collection. We are also very grateful to two anonymous referees who provided constructive comments on an earlier draft. This research was partly funded by the Mont Avic Natural Park and by the European Union (Alcotra project “PHENOALP––Phénologie alpine/Fenologia alpina”).

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Copyright information

© Dt. Ornithologen-Gesellschaft e.V. 2013

Authors and Affiliations

  • Massimo Bocca
    • 1
  • Enrico Caprio
    • 2
    Email author
  • Dan Chamberlain
    • 2
  • Antonio Rolando
    • 2
  1. 1.Parco Naturale Mont AvicChampdepraz (Aosta)Italy
  2. 2.Dipartimento di Scienze della Vita e Biologia dei SistemiTurinItaly

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