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Keyword: California

Hikers and recreational stock users: predicting and managing recreation conflicts in three wildernesses

Publications Posted on: July 19, 2006
A long-term problem that continues to grow in many wildland areas is the displeasure hikers express about meeting recreational livestock (primarily horses and mules) and seeing impacts from stock use. Three studies were conducted to provide a broad look at this interaction in wilderness and some of the contributors to the conflict between hikers and horse users.

Comparing landscape scale vegetation dynamics following recent disturbance in climatically similar sites in California and the Mediterranean basin

Publications Posted on: July 06, 2006
A long line of inquiry on the notion of ecological convergence has compared ecosystem structure and function between areas that are evolutionarily unrelated but under the same climate regime. Much of this literature has focused on quantifying the degree to which animal morphology or plant physiognomy is alike between disjunct areas. An important property of ecosystems is their behavior following disturbance.

Silvicultural practices (commercial thinning) are influencing the health of natural pine stands in eastern California

Publications Posted on: June 20, 2006
Overstocked 70- to 90-year-old stands of ponderosa pine on medium to low quality sites were thinned in 1980 to 40, 55, and 70 percent of normal basal area and compareh to an unthinned control. Mortality was recorded annually. Growth was measured every 5 years from 1980 to 1994.

Evaluation of mist-netting, nest-searching and other methods for monitoring demographic processes in landbird populations

Publications Posted on: May 17, 2006
Demographic processes (reproductive success, survival of young and adults, recruitment of young into the breeding population) are critical to monitoring and managing landbird populations. We discuss different techniques that have been used to monitor these demographic processes in landbird populations, focusing on constant-effort mist-netting (CEM).

Donations as an alternative to wilderness user fees: the case of the desolation wilderness

Publications Posted on: March 09, 2006
Day-use visitors to the Desolation Wilderness were asked about making voluntary donations at the trailhead. Of the 111 visitors who used one of the four trailheads at which voluntary donations were requested, 55% reported making a donation, with an average reported donation amount of $4.20. Subjects were categorized into three groups: donors, would-be donors, and nondonors.

Monitoring reproduction and contraception in free ranging wildlife: tule elk (Cervus elaphus nannodes) at Point Reyes National Seashore

Publications Posted on: March 07, 2006
The desire of the public to protect free-ranging animals in environments that are devoid of natural regulators can lead to overabundance of urban wildlife in closed habitats. In some parks and reserves, innovative management plans are needed that will include protocols to determine when and if artificial methods of population control should be applied to free-ranging wildlife as an acceptable alternative to hunting or culling.

Edge effects and the effective size of old-growth coast redwood preserves

Publications Posted on: March 07, 2006
Data were collected to determine the depth of influence of conditions created by clear-cut timber harvest on adjacent old-growth stands of coast redwood. Fourteen variables related to stand structure and composition, wildlife habitat, and physical environment exhibited significant correlation to distance from the timber harvest boundary.

Does protection of desert tortoise habitat generate other ecological benefits in the Mojave Desert?

Publications Posted on: March 07, 2006
This paper summarizes the ecological effects of fenced habitat protection for the desert tortoise (Gopherus agassizii) at the Desert Tortoise Research Natural Area in the Mojave Desert.

Effects on nonnative fishes on wilderness lake ecosystems in the Sierra Nevada and recommendations for reducing impacts

Publications Posted on: February 27, 2006
Wilderness areas of the Sierra Nevada, California contain thousands of lakes and ponds, nearly all of which were historically fishless. After more than a century of fish stocking, introduced trout are now present in up to 80% of larger lakes. These nonnative fishes have had profound impacts on native fishes, amphibians, and invertebrates.

Restoring natural fire regimes to the Sierra Nevada in an era of global change

Publications Posted on: February 27, 2006
A conceptual model of fire and forest restoration and maintenance is presented. The process must begin with clearly articulated goals and depends upon derivation of science-driven models that describe the natural or desired conditions. Evaluating the extent to which contemporary landscapes depart from the model is a prerequisite to determining the need for restoration.