Treesearch

The California State Water Resources Control Board is conducting hearings to set quantity and quality standards for river flows into San Francisco Bay. Comparisons of present conditions with "natural conditions" prior to European settlement were introduced into the hearings. Consumptive use relations were developed for various riparian and water-related plants, and estimates of the total annual volume of runoff production and consumptive use were developed. A discussion of those computations and a general discussion of the relation of historic riparian forests to "natural flows" into San...

Within the Mojave, Sonoran, and Chihuahuan Desert subdivisions of the North American Desert in the U.S., more than half of 143 total amphibian and reptilian species perform as riparian and/or wetland taxa. For the reptiles, but not the amphibians, there is a significant inverse relationship between riparianness (obligate through preferential and facultative to nonriparian) and desertness. In addition to the nondesert species (N=36) present, there are two evolutionary kinds of desert species in the herpetofauna: true desert species (N–20), and desert-included species (N=87); the former are...

Annual monitoring of Bank Swallows (Riparia riparia) along the Sacramento River, California has been conducted since 1986 to determine population trends, evaluate impacts from bank protection and flood control projects, and implement and monitor mitigation efforts. The population of Bank Swallows in a 50-mile river reach remained static over 3 breeding seasons from 1986 to 1988 despite ongoing bank protection projects. The proportion of burrows occupied by breeding swallows and the mean number of young/nest with young in a nesting colony was not significantly different between 1986 and...

Although it is unquestionably prudent to consider the cumulative watershed effects (CWEs) of timber harvesting, the presumed CWE phenomena offer limited opportunity for scientific inquiry. We are addressing two questions: are there synergistic sedimentation effects of sufficient magnitude to warrant consideration beyond efforts to reduce on-site erosion; and what are the expected long term effects of different harvesting schedules on fish habitat

A 160 km-long reach of Sacramento River was studied with the objective of predicting future changes in channel planform and their effects on water-surface elevations. Planform data were used to develop regression relationships between bend radius of curvature (Rc) and both short-term (5 years) and long term (90 years) lateral migration rates (MR) and migration distances (MD). A dimensionless cutoff index (Rc/MD) was developed to predict bend cutoff occurrence. Cutoffs occur when the cutoff index value is between 1.7 and 3.7. Channel planform controls water-surface elevations and bend...

Mike Napolitano has written a short paper on this subject as part of his Master's degree work in the Geology Department at Humboldt State University. Mike has produced a "sediment budget" for the North Fork, and took past logging history into account in his work. Francis Jackson is a long-time resident of the Mendocino area and an expert on its history and logging operations. He explained to Mike how the old growth was harvested here.

Spawning and rearing habitat for anadromous fish is the dominant use of Jackson Demonstration State Forest's (JDSF) many miles of streams. Both coho (silver) salmon and steelhead migrate from the ocean up our rivers in the fall and winter to spawn. About 90 miles of the Forest's streams have been classified as habitat for these fish.