scholarly journals Rock strength properties of granitic rocks in Yosemite Valley, Yosemite National Park, California

Data Series ◽  
2020 ◽  
Author(s):  
Brian D. Collins ◽  
Federica Sandrone ◽  
Laurent Gastaldo ◽  
Greg M. Stock ◽  
Michel Jaboyedoff
Keyword(s):  
National Park ◽  
Rock Strength ◽  
Strength Properties ◽  
Granitic Rocks ◽  
Yosemite National Park ◽  
Yosemite Valley

scholarly journals Effective removal of the American bullfrog (Lithobates catesbeianus) on a landscape level: long term monitoring and removal efforts in Yosemite Valley, Yosemite National Park

2019 ◽  
Vol 22 (2) ◽  
pp. 617-626 ◽  
Author(s):  
Colleen Kamoroff ◽  
Ninette Daniele ◽  
Robert L. Grasso ◽  
Rebecca Rising ◽  
Travis Espinoza ◽  
...  
Keyword(s):  
Invasive Species ◽  
National Parks ◽  
National Park ◽  
Environmental Dna ◽  
Freshwater Ecosystems ◽  
Yosemite National Park ◽  
American Bullfrog ◽  
Yosemite Valley ◽  
Park Service ◽  
Landscape Level

Abstract Invasive alien species are a major threat to freshwater ecosystems, and American bullfrogs are among the world’s 100 most prominent aquatic invasive species causing negative direct and indirect effect on native aquatic fauna worldwide. Bullfrogs were intentionally introduced into Yosemite Valley, Yosemite National Park in the 1950s where they became well established in the subsequent years. Starting in 2005, the National Park Service (NPS) began bullfrog removal, targeting various life stages using hand, net, and spear techniques. Starting in 2015, the NPS conducted environmental DNA (eDNA) surveys and deployed audio recordings devices to ensure adequate detection of bullfrogs. During the first year of cencerted effort in the Valley in 2005, the NPS removed 86% of all recorded bullfrog. The subsequent decade was spent searching for individuals with lower return on effort. In 2012, the NPS removed the last observed signs of bullfrog breeding, and the last observed bullfrog in 2019. Following removal of the breeding bullfrog population, the NPS began restoration projects for species of special concern. The NPS introduced the federally threatened California red-legged frogs (Rana draytonii) into Yosemite Valley beginning in 2016. This is the first published successful eradication of bullfrogs on a landscape level. National Parks and Monuments often provide refuges for imperiled wildlife and should be managed to remove invasive species. Our work highlights effective bullfrog removal is obtainable and can lead to local recovery of endangered species.

Analysis of bank erosion on the Merced River, Yosemite Valley, Yosemite National Park, California, USA

1994 ◽  
Vol 18 (2) ◽  
pp. 235-250 ◽  
Author(s):  
Mary Ann Madej ◽  
William E. Weaver ◽  
Danny K. Hagans
Keyword(s):  
National Park ◽  
Bank Erosion ◽  
Yosemite National Park ◽  
Yosemite Valley

scholarly journals Reframing Native Knowledge, Co-Managing Native Landscapes: Ethnographic Data and Tribal Engagement at Yosemite National Park

Land ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 335
Author(s):  
Rochelle Bloom ◽  
Douglas Deur
Keyword(s):  
Native American ◽  
National Park ◽  
National Park Service ◽  
Collaborative Management ◽  
Yosemite National Park ◽  
Dynamic Representation ◽  
Yosemite Valley ◽  
Park Service ◽  
Natural Resource Managers ◽  
Historical Accounts

Several Native American communities assert traditional ties to Yosemite Valley, and special connections to the exceptional landmarks and natural resources of Yosemite National Park. However, tribal claims relating to this highly visible park with its many competing constituencies—such as tribal assertions of traditional ties to particular landscapes or requests for access to certain plant gathering areas—often require supporting documentation from the written record. Addressing this need, academic researchers, the National Park Service and park-associated tribes collaborated in a multi-year effort to assemble a comprehensive ethnographic database containing most available written accounts of Native American land and resource use in Yosemite National Park. To date, the database includes over 13,000 searchable and georeferenced entries from historical accounts, archived ethnographic notebooks, tribal oral history transcripts and more. The Yosemite National Park Ethnographic Database represents a progressive tool for identifying culturally significant places and resources in Yosemite—a tool already being used by both cultural and natural resource managers within the National Park Service as well as tribal communities considering opportunities for future collaborative management of their traditional homelands within Yosemite National Park. We conclude that the organization of such data, including inherent ambiguities and contradictions, periodically updated with data provided by contemporary Tribal members, offers a rich, multivocal and dynamic representation of cultural traditions linked to specific park lands and resources. Indeed, some Yosemite tribal members celebrate the outcomes as revelatory, and as a partial antidote to their textual erasure from dispossessed lands. In practice however, as with any database, we find that this approach still risks ossifying data and reinforcing hegemonic discourses relating to cultural stasis, ethnographic objectivity and administrative power. By critically engaging these contradictions, we argue that one can still navigate pathways forward—bringing Native voices more meaningfully into the management of parks and other protected spaces, and providing a template useful at other parks for collaboration toward shared conservation goals.

Opportunities and challenges for restoration of the Merced River through Yosemite Valley, Yosemite National Park, USA

2020 ◽  
Vol 36 (9) ◽  
pp. 1803-1816
Author(s):  
Derek B. Booth ◽  
Katie Ross‐Smith ◽  
Elizabeth K. Haddon ◽  
Thomas Dunne ◽  
Eric W. Larsen ◽  
...  
Keyword(s):  
National Park ◽  
Yosemite National Park ◽  
Yosemite Valley

scholarly journals Investigation and hazard assessment of the 2003 and 2007 Staircase Falls rock falls, Yosemite National Park, California, USA

2008 ◽  
Vol 8 (3) ◽  
pp. 421-432 ◽  
Author(s):  
G. F. Wieczorek ◽  
G. M. Stock ◽  
P. Reichenbach ◽  
J. B. Snyder ◽  
J. W. Borchers ◽  
...  
Keyword(s):  
National Park ◽  
Three Dimensional ◽  
Source Area ◽  
Rock Fall ◽  
Yosemite National Park ◽  
Rock Falls ◽  
Joint Spacing ◽  
Hydrologic Processes ◽  
Yosemite Valley ◽  
Triggering Mechanisms

Abstract. Since 1857 more than 600 rock falls, rock slides, debris slides, and debris flows have been documented in Yosemite National Park, with rock falls in Yosemite Valley representing the majority of the events. On 26 December 2003, a rock fall originating from west of Glacier Point sent approximately 200 m3 of rock debris down a series of joint-controlled ledges to the floor of Yosemite Valley. The debris impacted talus near the base of Staircase Falls, producing fragments of flying rock that struck occupied cabins in Curry Village. Several years later on 9 June 2007, and again on 26 July 2007, smaller rock falls originated from the same source area. The 26 December 2003 event coincided with a severe winter storm and was likely triggered by precipitation and/or frost wedging, but the 9 June and 26 July 2007 events lack recognizable triggering mechanisms. We investigated the geologic and hydrologic factors contributing to the Staircase Falls rock falls, including bedrock lithology, weathering, joint spacing and orientations, and hydrologic processes affecting slope stability. We improved upon previous geomorphic assessment of rock-fall hazards, based on a shadow angle approach, by using STONE, a three-dimensional rock-fall simulation computer program. STONE produced simulated rock-fall runout patterns similar to the mapped extent of the 2003 and 2007 events, allowing us to simulate potential future rock falls from the Staircase Falls detachment area. Observations of recent rock falls, mapping of rock debris, and simulations of rock fall runouts beneath the Staircase Falls detachment area suggest that rock-fall hazard zones extend farther downslope than the extent previously defined by mapped surface talus deposits.

scholarly journals Quantitative rock-fall hazard and risk assessment for Yosemite Valley, Yosemite National Park, California

2014 ◽  
Author(s):  
Greg M. Stock ◽  
Nicolas Luco ◽  
Brian D. Collins ◽  
Edwin L. Harp ◽  
Paola Reichenbach ◽  
...  
Keyword(s):  
Risk Assessment ◽  
National Park ◽  
Rock Fall ◽  
Yosemite National Park ◽  
Yosemite Valley ◽  
Hazard And Risk ◽  
Hazard And Risk Assessment
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