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- Volume 51, Issue 3July 2012
- Volume 51, Issue 2April 2012
- Volume 51, Issue 1January 2012
- Volume 50, Issue 4October 2011
- Volume 50, Issue 3July 2011
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Volume 51, Issue 4 (2012) Latest Issue
Suitability of Cardamine concatenata (Michx.) Sw. as an Indicator Species on the Ottawa National Forest
Margaret M. Fox, Susan J. Trull, and Blair Orr
The cutleaf toothwort (Cardamine concatenata) is one of four Management Indicator Species monitored on the Ottawa National Forest. It is a perennial spring ephemeral used to indicate effects of forest management, particularly timber harvest, on site conditions in northern hardwoods, and on populations of forest understory spring wildflowers. Surveys were conducted in 70 treated and 61 non-treated stands. Stands were monitored for abundance of C. concatenata as well as abundance of three other spring ephemerals (Cardamine diphylla, Claytonia caroliniana, and Allium tricoccum). Additional site characteristics that could affect C. concatenata abundance were monitored, including micro-topography, ground flora, earthworm disturbance, and deer browse.Analysis assessed both the impact of management on site conditions and the suitability of using C. concatenata as an indicator species. Results showed no significant relationship between hardwood management and C. concatenata abundance. While C. concatenata was representative of the other three spring ephemerals monitored, its relative scarcity across the Ottawa National Forest raises questions as to its suitability as a Management Indicator Species.
The Distribution, Ecology, and Conservation Status of Rubus acaulis Michx. (Dwarf or Arctic Raspberry) in Michigan
Bradford S. Slaughter and Jan Schultz
Rubus acaulis Michx. (dwarf or arctic raspberry) is a dwarf herbaceous perennial plant in the rose family (Rosaceae) characteristic of mesic to hydric open and forested habitats across boreal North America. The species ranges south locally to the conterminous United States, where it is designated a sensitive species by the United States Forest Service in Region 2 in Colorado and parts of Regions 6 and 9 in Washington and Michigan, respectively. Rubus acaulis was first discovered in Michigan in 1976, and several additional populations have been documented over the past decade from minerotrophic peatlands in eastern Upper Michigan, extending west to Marquette County. In these habitats, which are classified as patterned fen, northern fen, and poor fen, R. acaulis occurs with a consistent group of vascular plant associates, and is typically most frequent on the tops, sides, and margins of Sphagnum-dominated hummocks. Despite the recent documentation of several very large populations, the long-term prospects for the persistence of R. acaulis in Michigan remain uncertain due to the threat of climate change and associated disruption of ecosystem processes in its peatland habitats.