Reports and documents by IAE staff.
EXECUTIVE SUMMARY Pink sand-verbena (Abronia umbellata ssp. breviflora) is listed as endangered by the Oregon Department of Agriculture, and a Species of Concern by the U.S. Fish and Wildlife Service. Since the late 1970’s, the number of natural populations in Oregon has decreased by approxiamately 50% (~10 to ~5). The primary threats to the species […]
Upper and Lower Table Rocks, located northeast of Medford, Oregon, are collectively designated as an Area of Critical Environmental Concern (ACEC) by the Bureau of Land Management (BLM). The Table Rocks are characterized primarily by vernal pool and mound habitats that support several rare species, including Limnanthes pumila ssp. pumila (née Limnanthes floccosa ssp. […]
Executive Summary This document reports preliminary findings and summarizes methods used in monitoring the threatened species Lupinus oreganus in the BLM Roseburg District. In 2016, we monitored L. oreganus populations by assessing foliar (leaf) cover (a measure of abundance), raceme count, and fruit production at six different sites in the Roseburg District. Seed set and […]
Habitat and population monitoring for Chloropyron maritimum ssp. palustre and Limonium californicum on the Coos Bay North SpitGiles, D.E.L., E.C. Gray, and T.N. Kaye 2014
EXECUTIVE SUMMARY In 2014 the estimated number of Chloropyron maritimum ssp. palustre plants on the Coos Bay North Spit land managed by the Coos Bay District of the Bureau of Land Management is ~1,511,000 (508,000 in the protected area and 1,003,000 in the unprotected area). This is the highest estimated population in the unprotected area, […]
Habitat and population monitoring for Chloropyron maritimum ssp. palustre and Limonium californicum on the Coos Bay North SpitGiles, Denise E.L., Erin C. Gray, Matt A. Bahm, and Thomas N. Kaye 2015
EXECUTIVE SUMMARY In 2015 the estimated number of Chloropyron maritimum ssp. palustre plants on the Coos Bay North Spit land managed by the Coos Bay District of the Bureau of Land Management is ~1,516,000 (462,000 in the protected area and 1,053,000 in the unprotected area). This is the on par with the highest population estimate […]
In 2016 the estimated number of Chloropyron maritimum ssp. palustre plants on the Coos Bay North Spit land managed by the Coos Bay District of the Bureau of Land Management is ~370,000 (277,000 in the protected area and 93,000 in the unprotected area). This is the lowest population estimate since monitoring began in 2011.
In 2016 the population of Limonium californicum is estimated to be ~652,000 with 532,000 and 120,000 in the protected and unprotected area, respectively.
Despite the relatively high number of plants, both species experienced decreases in total population size from 2015-2016, and Chloropyron maritimum ssp. palustre showed large decreases in areal cover in the unprotected area.
The area occupied with these rare species is found in a long, narrow strip of appropriate habitat in a dynamic system. This narrow strip of land (~700m long with a maximum width of 50m) lies in a precarious location along the shoreline where minor fluctuations in sea level (due to natural or manmade activities), could cause significant loss of habitat. More immediate effects from ORV use are also evident.
Astragalus mulfordiae: Population dynamics and the effect of cattle grazing in the Vale District, BLMMeaghan I. Petix, Eric C. Gray, and Matt A. Bahm 2016
EXECUTIVE SUMMARY This document summarizes monitoring of Astragalus mulfordiae (Mulford’s milkvetch) on land managed by the BLM Vale District. In 2016, we monitored plots testing for effects of herbivory on A. mulfordiae in permanent plots along with transects looking at long-term population trends and plant community composition. • In 2016 we observed similar densities of […]
EXECUTIVE SUMMARY In 2016, treatments varied by site and establishment of seeded species was low across sites. Overall, soil removal treatments showed the most promise across sites. Soil removal plots had lower cover of invasive grasses and forbs and offered more potential management action(s). Future monitoring will help to elucidate treatment effectiveness and aid in […]
Population monitoring of grimy mousetail (Ivesia rhypara var. rhypara) and Crosby’s buckwheat (Eriogonum crosbyae)Petix, Meaghan I. and Matt A. Bahm 2016
EXECUTIVE SUMMARY This document summarizes monitoring of Ivesia rhypara var. rhypara (grimy mousetail) and Eriogonum crosbyae (Crosby’s buckwheat) on land managed by the BLM Lakeview District. In 2016 we revisited 5 special status plant sites in Guano Valley, Lake County, OR: 1 site for I. rhypara var. rhypara and 5 for E. crosbyae . In […]
Assessing the status and extent of Lupinus lepidus var. cusickii in Denny Flat, Baker County, OregonPetix, Meaghan I., Matt A. Bahm, and Erin C. Gray 2016
EXECUTIVE SUMMARY We conducted a full census of Lupinus lepidus var. cusickii subpopulations in Denny Flat on land managed by the Vale District of the Bureau of Land Management. In 2016, we monitored permanent monitoring transects to examine plant community and L. lepidus var. cusickii population trends. This species can have high annual variability and […]