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Woodsia Neomexicana Windham Common Name – New Mexico Cliff Fern 2

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Woodsia Neomexicana Windham Common Name – New Mexico Cliff Fern 2 1. Species: Woodsia neomexicana Windham Common name – New Mexico cliff fern 2. Status: Table 1 summarizes the current status of this plant by various ranking entities and defines the meaning of the status. Table 1. Current status of Woodsia neomexicana Entity Status Status Definition G4? - Globally apparently secure - uncommon but not rare, and usually widespread. Possible cause of long- NatureServe G4? term concern. Usually more than 100 occurrences and more than 10,000 individuals. ? – Denotes inexact or uncertain numeric rank S2 - State imperiled - Imperiled because of rarity or because of some factor(s) making it very vulnerable to Colorado Natural Heritage S2 extirpation or extinction. Typically 6 to 20 Program (CNHP) occurrences or between 1,000 and 3,000 remaining individuals. USDA Forest Service None Not federally recognized under the Endangered USDI Fish and Wildlife Not listed Species Act (ESA) as endangered, threatened, Service proposed, or candidate species. The 2012 U.S. Forest Service Planning Rule defines Species of Conservation Concern (SCC) as “a species, other than federally recognized threatened, endangered, proposed, or candidate species, that is known to occur in the plan area and for which the regional forester has determined that the best available scientific information indicates substantial concern about the species' capability to persist over the long- term in the plan area” (36 CFR 219.9). This overview was developed to summarize information relating to this species’ consideration to be listed as a SCC on the Rio Grande National Forest, and to aid in the development of plan components and monitoring objectives. 3. Distribution, abundance, and population trend on the planning unit: NatureServe (2015) reports the global range of this species is the southwestern United States: New Mexico to southern Colorado, Arizona, southwestern Texas, and western Oklahoma with spotty distribution in South Dakota and Oklahoma. In Colorado it is known from Alamosa, Archuleta, Baca, Douglas, El Paso, Fremont, Hinsdale, La Plata, Las Animas, Ouray, Pueblo, Rio Grande, Saguache, and Teller Counties. Woodsia neomexicana is not tracked or ranked in the other states in which it occurs. There are three CNHP element occurrence records of Woodsia neomexicana in the planning area. One occurrence is considered a historical occurrence; it was reported in 1954 and has not been revisited. There 1 are no data pertaining to the size or condition of the occurrences. There are 21 additional occurrences reported in Colorado outside the planning area (CNHP 2015). Data are not available for determination of a population trend on the planning unit. USFS Corporate Database Habitat Type Associated with the Species: Woodsia neomexicana grows in areas described as shrubby hillsides and open sparsely vegetated habitats nearly always associated with rocks, in crevices, on talus slopes, on ledges, on boulders, old stone walls, and in rocky soil. The Flora of North America (FNA 1993+) states that it is found on cliffs and rocky slopes, usually on sandstone or igneous substrates at elevations ranging from 950 feet to 11,500 feet. NatureServe (2015) identifies its habitat as bare rock, talus, scree and cliffs. The habitat notes for the occurrences within planning area described habitat as west-facing slope to drainage with rock outcrops and southeast-facing slope on thin-rocky soil (CNHP 2015). The areas of the known occurrences are mapped as Arizona Fescue on Mountain Slopes and Pinyon on Mountain Slopes Land Type Associations (LTAs). Other LTAs in the planning area cannot be ruled out as habitat due to the coarse scale of the mapping units (RGNF GIS data). CNHP Ecological System of the Southern Rocky Mountains Ecoregion: There is not enough information to identify CNHP Ecological Systems for this species, but it’s suspected that it would occur in the Rocky Mountain Cliff, Canyon and Massive Bedrock Ecological System (CNHP 2005). 4. Brief description of natural history and key ecological functions: Woodsia neomexicana is a small, perennial, epipetric (found growing on rocks) fern. Its stems are compact and erect to ascending. Roots are slender and fibrous with short-creeping, scaly rhizomes that bear tufts of fronds. The species has traditionally been identified as Woodsia mexicana. Both W. mexicana and W. neomexicana are tetraploid and may share one parent. Isozyme data suggest that W. neomexicana is an allotetraploid hybrid between W. phillipsii and the diploid progenitor of W. oregana subsp. cathcartiana. As with all allopolyploids, W. neomexicana can vary in the direction of either parent, and some plants (especially those resembling W. phillipsii ) can be difficult to identify (FNA 1993+). Life history information on the species, including life history stages, population structure, longevity, mortality, population biology and gamete/spore biology are not available. Demographic parameters, such as recruitment and survival rates, are not currently available so there are no definitive data regarding the vital rates that contribute to species fitness. There is insufficient knowledge about Woodsia neomexicana to determine what factors limit population growth. Population growth or establishment could be limited by inadequate genetic variability for long- term persistence, or ineffective reproduction. Ode (2001) noted that the species likely occupies only a small percentage of available habitat so reduced habitat availability is likely not a restriction to population growth. The rate at which colonization and establishment of new populations occurs is unknown and it is 2 unclear what type, size, intensity, or frequency of disturbance regime is important. Genetic concerns, such as the amount of genetic variability between and within the occurrences, have not been studied. 5. Overview of ecological conditions for recovery, conservation, and viability: The habitat of cliffs and rocky slopes is not likely to be directly impacted by most management activities, other than recreational use and hardrock mining. The element occurrence reports for the occurrences on the planning unit do not identify any threats for this species. The reports for the occurrences on the planning unit do not include information on the viability of the occurrences. The viability of occurrences outside the planning unit (within Colorado) is ranked as fair or good (for the occurrences that have viability information) (CNHP 2015). As with most plant species, global climate change is potentially a threat. In 2014, Climate Change Vulnerability Assessments were conducted for 60 of the plant species tracked by the CNHP, utilizing the NatureServe Climate Change Vulnerability Index (Handwerk et al. 2014). Woodsia neomexicana was not assigned a climate vulnerability score during the assessments, even though it is listed as a species present in the area (Handwerk et al. 2014). Overall, based on current information, threats to Woodsia neomexicana are considered relatively low. However, this should be tempered with the high number of unknown for this species. 6. Key ecosystem characteristics and ecological conditions for recovery, conservation, and viability: Because there are only three known occurrence of this species on the RGNF, it is important to maintain those occurrences. Presently, threats appear to be at a low and manageable level. The RGNF should strive to maintain habitat conditions for Woodsia neomexicana by applying suggested management practices as follows: 1) Manage habitat - Manage and adjust pressures from any management influences found to be creating unacceptable impacts. Areas of proposed or planned mining activity should be surveyed for the species. 2) Manage environmental stressors - Continue assessing the RGNF’s contribution to global climate change and adjust actions where permissible within the Forest Service’s legal and regulatory authority. Use tools such as the Forest’s Climate Change Scorecard to assess impacts and make positive changes where needed. 3 7. Key uncertainties and information needs/gaps: There are a large number of information gaps and research needs for this species. Re-visiting the known occurrences, estimating current abundance, assessing imminent threats, measuring demographic parameters, studying genetic variability and determining ecological needs and limitations are of primary importance to further the understanding of Woodsia neomexicana. The following suggestions are ordered from inventory activities (to determine the current status) to more complex biological studies (to help understand the species): • Re-visiting and detailed mapping of the known occurrences • Surveying for new populations • Addressing any imminent threats to the known occurrences • Defining and measuring microhabitat characteristics • Measuring demographic parameters using long-term monitoring plots • Analyzing genetics to assess gene flow and variability throughout range The following is an outline of a monitoring approach that could be used to inform the development of the RGNF Forest Plan revision’s monitoring plan. Additionally, areas of research opportunity (beyond the scope of the Forest Plan revision) are suggested below based on key uncertainties about this species. 1) Monitoring: monitoring priority is a judgment determination based on number of occurrences, potential threats, and conservation status. The priority for this species is thought to be low. This is primarily due to the status being G4?S2 (see Table 1), low number of potential threats and the limited
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