In Oregon, the remaining fishers are restricted to two separate and genetically isolated populations in southwestern Oregon; one in the northern Siskiyou Mountains and one in the southern Cascade Range. A conservation strategy for the Humboldt marten should increase the size of the current population so that genetic, demographic, and environmental uncertainties are less threatening, and establish multiple populations so that a single catastrophic event (such as large wildfire) cannot eliminate the subspecies.  Specific measures to conserve the Humboldt marten may include: , Arcata Fish and Wildlife Office, 1655 Heindon Road, Arcata, California 95521, USA, News The common theme between fishers and martens is the concept of LARGE. Fishers may select rest sites in the vicinity of gut piles left by deer hunters. Protect currently suitable resting and denning structures. ).  Voles, squirrels and chipmunks are important food items for martens across their range.  In the Sierra Nevada of California, mammals were the most important food item, with microtine rodents the most frequent prey throughout the year, and chipmunks and squirrels increasing in importance during the summer.  Seasonal variation in diets is universal with the importance of soft mast peaking in the fall.  In the diet of Humboldt martens, mammals (93% of scats analyzed) and berries (85%) were the most frequently occurring items, followed by birds (21%), insects (20%), and reptiles (7%).  Squirrels and voles  were the most common mammal species in the diet.  The frequency of berries and birds in the diet of the Humboldt marten is the highest reported in studies of the American marten. Wildfire has the potential to greatly alter habitat essential to martens when it removes structural components including overstory canopy, large logs or dense understory shrubs.  Projects to reduce risk of wildfire are potentially beneficial to martens by reducing overall risk of large-scale, intense wildfire, yet need to be carefully planned to minimize the loss of essential habitat components or fragmenting existing suitable habitat.  Roads may fragment suitable habitat and provide corridors for movement of potential predators such as bobcats and coyotes.  While direct trapping of martens in California has not been legal for several decades, incidental capture of martens while targeting other species may still occur, and should be monitored to assess the risk.  Trapping of martens remains legal in Oregon.  Management activities that encourage populations of other carnivores, such as bobcats, fishers and cougars, may place additional pressure on the remaining marten population, as several of these species, especially fishers, may opportunistically kill martens when encountered.Â. Denizens of the Deep: Fisher and Humboldt Marten. By the 1950s, populations of Humboldt martens were highly reduced. Establish high priority restoration areas. Interpretations, Habitat Selection by American Martens in font-family: Georgia, "Times New Roman", Times, serif; color: #666666; Martens are secretive hunters that only move through dense shrub cover or areas with closed forest canopy, so extensive clearcutting has dramatically fragmented their range, isolating populations in Oregon and California. Both fishers and martens are considered generalized predators; they will eat just about anything they can catch, including rabbits, small mammals, birds, lizards, and insects. Fishers in northwestern California are doing better than their Washington and Oregon counterparts. Crescent City, CA Fishers are sighted every year in Redwood National and State Parks and various surveys over the past decades detected fishers routinely. Martens tend to use the largest available patches of late mature or old-growth forest and prefer areas with dense shrub understories. Martens in California, 1989-1994: Summary and The ranges of both fisher and Humboldt marten have shrunk dramatically in recent decades; the range reductions were fueled by the fur trade, and exacerbated by loss of late seral forests, their selected habitat. Restore or maintain dense, productive understory shrub layers and reduce road densities. Fishers may avoid forests with dense shrub understories, and in RNSP, tend to use mature second growth stands as well as old growth. The fisher (Pekania pennanti) and Humboldt marten (Martes caurina humboldtensis) are two mid-sized carnivores (“mesocarnivores”) in the weasel family, Mustelidae. However, male martens and female fishers can be about the same size. The old growth in RNSP may represent some of the best habitat in which martens could make a comeback. 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