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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Effect of variation in forest harvest intensity on winter occupancy of Barred Owls and Eastern Screech-Owls in deciduous forests of the east-central United States
Auteurs :	Olivia D. Leonard, Auteur ; Jonathan W. Moore, Auteur ; Jeffery K. Riegel, Auteur ; Andrew R. Meier, Auteur ; John B. Dunning, Auteur ; Kenneth F. Kellner, Auteur ; Robert K. Swihart, Auteur
Type de document :	Article
Dans :	Journal of Field Ornithology (86(2) juin 1, 2015)
Article en page(s) :	115-129
Langues:	Anglais
Mots-clés:	Megascops asio ; Strix varia ; forest management ; southern Indiana ; timber harvesting ; winter habitat
Résumé :	Responses of resident owls to changes in forest structure associated with forest management in the Central Hardwood Forest Region of the United States have not been widely studied. We estimated the winter occupancy of Barred Owls (Strix varia) and Eastern Screech-Owls (Megascops asio) in forests with varying levels of timber harvest in southern Indiana. Surveys were conducted from 2009 to 2013 in two state forests undergoing active harvesting, a national forest unit with little recent harvesting, and a forested state park with no harvesting since about 1940. We hypothesized that 1) Barred Owl occupancy would vary inversely with harvesting intensity because they prefer mature forest, 2) Eastern Screech-Owl occupancy would be greatest in the actively managed forests given their affinity for edge habitat, and 3) Eastern Screech-Owls would avoid Barred Owl sampling areas and, thus, Barred Owl predation. Barred Owl occupancy was lowest in the non-harvested state park relative to other areas, and Eastern Screech-Owls were less likely to co-occur in Barred Owl sampling areas. We found no evidence that forest management was inversely related to Barred Owl occupancy or that active edge creation associated with forest management increased the magnitude of Eastern Screech-Owl occupancy. Reduced rates of Barred Owl occupancy in the state park may have resulted from high levels of recreational activity, whereas increased rates of Eastern Screech-Owl occupancy in the park may have resulted from ample hunting opportunities in an environment with fewer Barred Owl predators. Recreational activity, prey availability, and interspecific antagonism likely have greater influences than timber harvesting on winter site occupancy of these owls in our study areas.
En ligne :	http://onlinelibrary.wiley.com/doi/10.1111/jofo.12095/abstract

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