Your search for keyword(s) "california" resulted in 23 record(s).

Back to Home Page

View next 8 results

Title: The effects of livestock on California ground squirrels (Spermophilus beecheyii): Journal: Rangeland Ecology & Management; Authors: J. S. Fehmi, S. E. Russo, and J. W. Bartolome; Date: 2005; Summary: The effects of low to moderate cattle grazing on the number of active California ground squirrels burrows and their spatial distribution were studied for three years on the central coastal range of California (37Â° 35â€™ 47â€ N, 121Â° 42â€™ 47â€ W). Two communities (grassland, oak savanna) each received two grazing treatments (grazed, ungrazed). Each site had nine existing colonies. A squirrel colony census was taken a year before each treatment and again in the fall of each study year. Plant species, herbaceous cover and primary ...; Agrovoc Control Words: Grazing, Rangelands, Squirrels; View more details about this article

Title: Burning and grazing management in a California grassland: Effect on bunchgrass seed viability: Journal: Restoration Ecology; Authors: A. R. Dyer; Date: 2002; Summary: In California, prescribed fire and grazing are management tools to reduce non-native species in annual grasslands. Purple needlegrass (Nassella pulchra) subject to summer grazing and fire produced larger seeds with higher germinability (after 10 years in cool storage) than either treatment alone. Burning without prior grazing increased seed size by 20% and germination by 72%, while grazing without burning reduced seed size and germination. The strong relationship between long-term viability and seed size suggests greater maternal provisioning and increased seed quality subsequent to burning ...; Agrovoc Control Words: Riparian zones, Rangelands, Wildlife; View more details about this article

Title: Species richness and California voles in an annual and a perennial grassland: Journal: Western North American Naturalist; Authors: J. S. Fehmi, and J. W. Bartolome; Date: 2002; Summary: Over two consecutive years, Fehmi and Bartolome evaluated two sites ungrazed by livestock, one dominated by native perennial grasses and another dominated by invasive annuals, to determine the relationship between plant species richness and location of Microtus californicus (California vole) burrow entrances (burrows). Quadrats with burrows averaged significantly more plant species than those without them. Burrows found in 1996 were not correlated with species richness in 1995, suggesting that voles affect richness rather than seek it out. Since voles seem to create a clumped pattern with t ...; Agrovoc Control Words: Riparian zones, Rangelands, Wildlife; View more details about this article

Title: Influence of grazing on channel morphology of intermittent streams: Journal: Journal of Range Management; Authors: M. R. George, R. E. Larsen, N. K. McDougald, K. W. Tate, J. D. Gerlach, and K. O. Fulgham; Date: 2002; Summary: Changes in stream channel morphology due to grazing were examined in a riparian grazing study conducted at the San Joaquin Experimental Range (SJER) in Madera County, California (37Â° 05' N, 169Â° 45' W). Five grazing treatments (no grazing, wet season-moderate, wet season-high concentration, dry season-moderate, dry season-high concentration) were applied using mature beef cows on three intermittent streams. Wet season grazing occurred from February to May, and dry season grazing ran from July to October. Supplements were used to lure animals to achieve concentration tre ...; Agrovoc Control Words: Riparian zones, Grazing, Streams; View more details about this article

Title: Deer herbivory as an ecological constraint to restoration of degraded riparian corridors: Journal: Restoration Ecology; Authors: J. J. Opperman, and A. M. Merenlender; Date: 2000; Summary: The effect of deer (Odocoileus hemionus columbianus) herbivory that occurred 4-15 years ago and the recovery that has occurred on riparian corridors in Mendocino County, CA was investigated. Six deer exclosures (4 to 15 years old) on existing stream restoration efforts were compared to 6 upstream plots. Woody vegetations surveys recorded the amount, density, size, and type of vegetation for each exclosure and control plot. ...; Agrovoc Control Words: Riparian zones, Herbivory, Wildlife; View more details about this article

Title: Age, geographic, and temporal distribution of fecal shedding of Cryptosporidium parvum oocysts in cow-calf herds: Journal: American Journal of Veterinary Research; Authors: E. R. Atwill, E. Johnson, D. J. Klingborg, G. M. Veserat, G. Markegard, W. A. Jensen, D. W. Pratt, R. E. Delmas, and H. A. George; Date: 1999; Summary: This study evaluated fecal shedding of Cryptosporidium parvum from California cow-calf herds with respect to age, geographic region, temporal effects, and association with watery feces in order to help focus watershed management plans designed to minimize contamination of source water with this parasite. 3.9 percent of all cattle in the study were shedding C. parvum oocysts, while point prevalence of shedding among all calves in the study was 5.6%. Adjusting for month of fecal collection, the odds of shedding among 2-month-old calves were 41 times greater than among cattle over 4 months old. ...; Agrovoc Control Words: Riparian zones, Rangelands, Wildlife; View more details about this article

Title: Effects of burning and grazing on a coastal California grassland: Journal: Restoration Ecology; Authors: D. A. Hatch, J. W. Bartolome, J. S. Fehmi, and D. S. Hillyard; Date: 1999; Summary: Fall burning and continuous grazing of California coastal prairie on upper, middle, and lower slopes had varied effect on 3 native perennial grasses. Foliar cover of California oatgrass (Danthonia californica) increased by 10% under a 10-year or more continuous grazing regime, but decreased in both cover and frequency when grazing was excluded. Despite response to grazing, California oatgrass was unaffected by fire. In contrast, purple needlegrass (Nassella pulchra) and foothill needlegrass (Nassella lepida) did not respond cons ...; Agrovoc Control Words: Riparian zones, Rangelands, Wildlife; View more details about this article

Title: Anthropogenic degradation of the southern California desert ecosystem and prospects for natural recovery and restoration: Journal: Environmental Management; Authors: J. E. Lovich, and D. Bainbridge; Date: 1999; Summary: Large areas of the southern California desert ecosystem have been negatively affected by off-road vehicle use, overgrazing by domestic livestock, agriculture, urbanization, construction of roads, air pollution, and other activities. Secondary contributions to degradation include the proliferation of exotic plant species and a higher frequency of anthropogenic fire. Effects of these impacts include alteration or destruction of macro- and micro- vegetation elements, establishment of annual plant communities dominated by exotics, soil compaction, and increased erosion. Published estimates of r ...; Agrovoc Control Words: Riparian zones, Rangelands, Wildlife; View more details about this article

Title: Effects of stream channel morphology on golden trout spawning habitat and recruitment: Journal: Ecological Applications; Authors: R. A. Knapp, V. T. Vredenburg, and K. R. Matthews; Date: 1998; Summary: Channel width, depth, water velocity, vegetation cover, and substrate size were measured along two different streams in the Golden Trout Wilderness (118Â° 15' N, 36Â° 22' W), in Sierra Nevada Mountains, California to determine the effects of livestock grazing on California golden trout spawning habitat. Trout redds (nests) and juvenile trout were also counted on both streams. The first stream had five wide stream reaches paired with five narrow reaches. The other stream had a livestock exclosure that was constructed 10 years prior to the start of the study; and measurement ...; Agrovoc Control Words: Riparian zones, Rangelands, Fish; View more details about this article

Title: Intraspecific and diffuse competition: The response of Nassella pulchra in a California grassland: Journal: Ecological Applications; Authors: A. R. Dyer, and K. J. Rice; Date: 1997; Summary: Dyer and Rice measured the effects of weeding, increased soil depth, grazing and prescribed burning on the competitive relationship between the native perennial, purple needlegrass (Nassella pulchra), and invasive annual species to determine if use of these management tools could restore the native plant community in the California annual grasslands. Burning and weeding both reduced the effects of diffuse competition with annual species, however, the effects of fire only lasted one season. Soil depth and grazing did not have direct effects on plant growth or survival, however grazing tended ...; Agrovoc Control Words: Riparian zones, Rangelands, Wildlife; View more details about this article

Title: Factors influencing the probability of oak regeneration on southern Sierra Nevada woodlands in California: Journal: Madrono; Authors: R. Standiford, N. McDougald, W. Frost, and R. Phillips; Date: 1997; Summary: The objective of this study was to develop models to predict the probability of oak (Quercus spp.) regeneration on specific hardwood rangeland areas in the western foothills of the southern Sierra Nevada range in California. In general, there was a relatively high probability of oak seedling stocking in most areas. However, oak seedlings may not persist in the landscape for the long term. Relatively low probability of sapling stocking in this study suggests there may be a problem in having adequate recruitment of oaks to replace mortality of mature trees. A significant ...; Agrovoc Control Words: Riparian zones, Rangelands, Wildlife; View more details about this article

Title: Bighorn sheep response to ephemeral habitat fragmentation by cattle: Journal: Great Basin Naturalist; Authors: J. A. Bissonette, and M. J. Steinkamp; Date: 1996; Summary: California bighorn sheep (Ovis canadensis californiana) home range position shifted and range size was reduced when cattle (Bos taurus) were relocated into an allotment adjacent to sites with high sheep use. When cattle were moved into bighorn sheep core areas, distances moved by sheep increased by 355% compared to usual sheep movements (3,000 vs. 845 m, respectively). The mean distance between sheep and their escape terrain decreased as cattle and sheep were in closer proximity, suggesting that cattle are seen as a threat. Bighorn sheep newly reintroduced to the area were more sensitive to ...; Agrovoc Control Words: Riparian zones, Rangelands, Wildlife; View more details about this article

Title: Cattle distribution, habitats, and diets in the Sierra Nevada of California: Journal: Journal of Range Management; Authors: J. G. Kie, and B. B. Boroski; Date: 1996; Summary: Kie and Boroski investigated cattle home range and diet in the Sierra Nevada mountains of California, where shrubs dominate the understory rather than herbaceous species. Kie and Boroski used radio-telemetry collars on cows to determine their homes ranges and habitat use patterns. When choosing home ranges, cattle showed the greatest affinity for riparian habitat, followed by clearcuts, second-growth forest, and burned areas. Cattle diets included seeded grasses and shrubs mostly from upland sites, but forbs primarily from riparian sites. The authors suggest that the need for water and the ...; Agrovoc Control Words: Riparian zones, Rangelands, Wildlife; View more details about this article

Title: Livestock grazing, golden trout, and streams in the Golden Trout Wilderness, California: Impacts and management implications: Journal: North American Journal of Fisheries Management; Authors: R. A. Knapp, and K. R. Matthews; Date: 1996; Summary: Twelve habitat characteristics were measured inside and outside three livestock exclosures on two different streams in the Golden Trout Wilderness (118Â° 15' N, 36Â° 22' W), Sierra Nevada Mountains, California to determine the effect of livestock grazing on trout habitat. One exclosure was constructed in 1983, while the other two were built in 1991. Stream dimensions, water flow, substrate, and canopy height were measured among other variables along 125 m reaches at each site. Golden trout were surveyed using the electrofishing and willows were counted, and age-size class ...; Agrovoc Control Words: Riparian zones, Rangelands, Fish; View more details about this article

Title: Habitat selection and movement patterns of California golden trout in degraded and recovering stream sections in the Golden Trout Wilderness, California: Journal: North American Journal of Fisheries Management; Authors: K. R. Matthews; Date: 1996; Summary: Habitat selection and movement patterns of California golden trout along two stream sections (high sedge-ungrazed, low sedge-grazed) of Mulkey Creek meadow (36° 22\' N, 118° 15\' W), in the Golden Trout Wilderness were measured using radio transmitters. At 6 study sections in low- and high- sedge areas, 29 California golden trout were monitored from 6 July to 14 July 1994 over 192 diel-tracking hours. Locations and nine habitat features (undercut bank, willows, collapsed bank, open channel, aquatic vegetation, sedge, boulder, grass, and detrital mats) were recorded. ...; Agrovoc Control Words: Riparian zones, Grazing, Invertebrates; View more details about this article

View next 8 results

Back to Homepage