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... its up-to-five-year lifespan, Drosera rotundifolia passes through two life stages that may be considered cryptic: dormant seeds within the soil seed bank ( Crowder et al. 1990) and over-wintering dormant buds, called hibernacula (Figure 8). The soil seed bank may be especially important in recolonization following disturbance (Jacquemart et al. 2003). ...
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... D. anglica has been designated as an endangered species in Japan on the Red List (Ministry of the Environment Government of Japan, 2013), because only three localities with small populations have been reported. Drosera rotundifolia L., a congener of D. anglica, shows an overlapping distributional range with D. anglica but is more widespread (Wolf et al., 2006). D. anglica is an amphiploid of 2n = 40, which speciated from the hybridization between D. rotundifolia and D. linearis (Rivadavia G Model FLORA-50817;No. of Pages 6 et al., 2003), whereas D. rotundifolia is a diploid of 2n = 20 (Wolf et al., 2006). ...
... Drosera rotundifolia L., a congener of D. anglica, shows an overlapping distributional range with D. anglica but is more widespread (Wolf et al., 2006). D. anglica is an amphiploid of 2n = 40, which speciated from the hybridization between D. rotundifolia and D. linearis (Rivadavia G Model FLORA-50817;No. of Pages 6 et al., 2003), whereas D. rotundifolia is a diploid of 2n = 20 (Wolf et al., 2006). These two species show both sexual (seed) and vegetative reproduction. ...
... These two species show both sexual (seed) and vegetative reproduction. Sexual reproduction is performed on scapes with a few hermaphroditic flowers that are Drosera self-compatible (Wolf et al., 2006). Vegetative reproduction is achieved by producing daughters, i.e. new ramets. ...
... D. anglica has speciated from hybridizing between D. rotundifolia and D. linearis (Rivadavia et al. 2003 ). D. rotundifolia is a relatively widespread species compared with D. anglica (Wolf et al. 2006). D. anglica populations are declining even within undisturbed bogs in various regions where there are no direct anthropogenic disturbances because of climate changes (Huntke 2007; Jennings and Rohr 2011). ...
The preservation of endangered species requires clarifying habitat preferences through survival, growth and competitive ability. The determinants of habitat differentiation between the endangered species, Drosera anglica, and a widespread congener, D. rotundifolia, were compared. The effects of water level, Sphagnum mats and overstory vascular plants on Drosera distribution, recruitment and survival were monitored at a previously mined Sphagnum peatland. Seedling transplant experiments were conducted using different water levels. Seed-sowing experiments were conducted using different light intensities in three habitat-types: bare ground, Sphagnum mat and waterlogged surface. Distributions of D. anglica and D. rotundifolia were determined using survival at the seedling stage. D. anglica seedling recruitment and survival occurred more at lower water levels and/or lower plant cover, while D. rotundifolia seedlings established independent of these factors. In the greenhouse the seedlings of both species survived better at lower water levels but grew more slowly. D. anglica seedlings reduced their growth under shade more than D. rotundifolia. D. anglica showed low competitive light and nutrient ability on Sphagnum mats. Therefore, D. anglica was pushed to areas of high water levels where few competitors could establish. The habitat differentiation between D. anglica and D. rotundifolia originated from the interactions with Sphagnum mats.
Fens are common wetlands in the Beartooth Mountains on the Shoshone National Forest, Clarks Fork Ranger District, in Park County, Wyoming. Fens harbor plant species found in no other habitats, and some rare plants occurring in Beartooth fens are found nowhere else in Wyoming. This report summarizes the studies on Beartooth fens from 1962 to 2009, which have contributed to current knowledge of rare plant distributions and biodiversity conservation. The study area is the Wyoming portion of the Beartooth Mountains in the Middle Rocky Mountains. Here, we profile 18 fens that occur over the range of elevations, settings, geomorphic landforms, and vegetation. The wetland flora from these 18 fens is composed of 58 families, 156 genera, and 336 vascular plant species-more than 10 percent of the known Wyoming flora. We discuss 32 rare vascular plant species and 1 bryophyte species associated with Beartooth fens and their State and regional significance. Protection and management of Beartooth fens are addressed in guidance documents prepared by the U.S. Forest Service Groundwater Program, regional peatland and sensitive species policies, and the Shoshone National Forest Management Plan. Information compiled in this report increases understanding of Beartooth fens, provides a basis for future research and comparisons with mountain fens elsewhere in Wyoming and the Rocky Mountains, and contributes to conservation of fen resources and services.
Fens are common wetlands in the Beartooth Mountains on the Shoshone National Forest, Clarks Fork Ranger District, in Park County, Wyoming. Fens harbor plant species found in no other habitats, and some rare plants occurring in Beartooth fens are found nowhere else in Wyoming. This report summarizes the studies on Beartooth fens from 1962 to 2009, which have contributed to current knowledge of rare plant distributions and biodiversity conservation. The study area is the Wyoming portion of the Beartooth Mountains in the Middle Rocky Mountains. Here, we profile 18 fens that occur over the range of elevations, settings, geomorphic landforms, and vegetation. The wetland flora from these 18 fens is composed of 58 families, 156 genera, and 336 vascular plant species-more than 10 percent of the known Wyoming flora. We discuss 32 rare vascular plant species and 1 bryophyte species associated with Beartooth fens and their State and regional significance. Protection and management of Beartooth fens are addressed in guidance documents prepared by the U.S. Forest Service Groundwater Program, regional peatland and sensitive species policies, and the Shoshone National Forest Management Plan. Information compiled in this report increases understanding of Beartooth fens, provides a basis for future research and comparisons with mountain fens elsewhere in Wyoming and the Rocky Mountains, and contributes to conservation of fen resources and services.
