In this paper, recent studies of birds and small mammals inhabiting Populus (hybrid poplar and cottonwood) plantations are summarized. Plantations provide habitat at least as favorable for native birds and mammals (as evidenced by overall density, species richness, and species composition) as agricultural croplands. However, by the same measures, plantation habitat is poorer quality than natural or semi-natural forest. Bird and small mammal species composition on plantations is a mixture of openland (crop and grassland) and forest species that is unique compared to other nearby habitats, and does not resemble that of either grasslands or forests. Plantations may not function as forest at either habitat or landscape scales. For highly mobile animals such as birds, landscape composition plays a central role in determining occupancy of plantations. For less mobile organisms, within-plantation habitat quality is more critical. Sources of non-uniformity in plantation vegetation are important determinants of occupancy. Although unplanned variation in vegetation structure occurs on some plantations, assuring the presence of heterogeneity may require specific planning. There is no evidence of altered population interactions (nest predation or parasitism, small-mammal population performance, or interchange among local populations) as a result of plantation establishment.
Bibliographical noteFunding Information:
This research was supported by the North Central Forest Experiment Station of the U.S.D.A. Forest Service, the U.S. Department of Energy through the Biofuels Feedstock Development Program at Oak Ridge National Laboratory, the National Audubon Society, and the University of Minnesota. The authors thank the many individuals who assisted with field work, and landowners and managers for their cooperation in providing access to plantations. They thank R. R. Buech, T. B. Wigley and an anonymous reviewer for comments on a previous draft of the manuscript. This paper is contribution No. 187 of the Center for Water and the Environment, Natural Resources Research Institute.
- Biomass plantations
- Habitat studies
- Hybrid cottonwood
- Hybrid poplar
- North America
- Small mammals