Plagioclase compositions and non-anatectic origin of migmatitic gneisses in Northern Cascade mountains of Washington State

1968 ◽  
Vol 17 (1) ◽  
pp. 1-70 ◽  
Author(s):  
Peter Misch
Keyword(s):  
Washington State ◽  
Cascade Mountains

Phytoplankton assemblages in high-elevation lakes in the northern Cascade Mountains, Washington State USA

1998 ◽  
Vol 142 (1) ◽  
pp. 71-93 ◽  
Author(s):  
Gary L. Larson ◽  
C. David McIntire ◽  
Robert E. Truitt ◽  
William J. Liss ◽  
Robert Hoffman ◽  
...  
Keyword(s):  
High Elevation ◽  
Washington State ◽  
Cascade Mountains ◽  
Phytoplankton Assemblages

Prediction and mapping of landslide hazard

2000 ◽  
Vol 37 (4) ◽  
pp. 781-795 ◽  
Author(s):  
Tien H Wu ◽  
Mohamed A Abdel-Latif
Keyword(s):  
Failure Probability ◽  
Landslide Hazard ◽  
Washington State ◽  
South Fork ◽  
Large Area ◽  
Cascade Mountains ◽  
Additional Information ◽  
Site Investigations ◽  
Groundwater Response ◽  
Groundwater Hazard

The paper describes a mechanics-based methodology for prediction of landslide hazard on hillside slopes. The principal components are estimation of infiltration and groundwater response, and estimation of safety factor and failure probability. Predictions with the models are made by using the best estimates of the input parameters and the associated uncertainties. The uncertainties about the inputs and the sensitivities of the model outputs to uncertainties about the inputs are evaluated and translated into failure probability. Our objective was to provide a method that can be used to estimate landslide hazard over a large area prior to making detailed site investigations. The method was applied to slopes along the South Fork of Tilton River, in the Cascade Mountains of Washington State. Predicted hazards were compared with results of a landslide inventory. The data used in the examples were derived from published sources. However, the procedures developed are not limited to this condition and can readily incorporate additional information derived from more detailed investigations.Key words: failure probability, groundwater, hazard, landslides, mapping, slope stability.

Genetic differentiation, diversity, and inbreeding in the mountain monkeyflower (Mimulus caespitosus) of the Washington Cascades

1989 ◽  
Vol 67 (7) ◽  
pp. 2017-2024 ◽  
Author(s):  
Kermit Ritland
Keyword(s):  
Genetic Relationships ◽  
Genetic Distances ◽  
Washington State ◽  
Mountain Streams ◽  
Cascade Mountains ◽  
Postglacial Colonization ◽  
Expected Heterozygosity ◽  
Allozyme Loci ◽  
Nei's Genetic Distance ◽  
Washington Cascades

Mimulus caespitosus is a stoloniferous yellow monkeyflower that grows in small, perennial mountain streams. Plants from 22 populations around the crest of the Cascade Mountains in Washington State were electrophoretically assayed for 15 allozyme loci. Expected heterozygosity within populations (H), a measure of genetic diversity, averaged 0.17 and was negatively correlated with northeastward aspect. No association of H with elevation or position upstream was detected. Wright's gene fixation F averaged 0.19, indicating 20–30% selfing, and was significantly heterogeneous among populations. Nei's genetic distance D averaged 0.072, significantly above average for conspecific populations, especially considering all populations were within 11 km. Populations from the same stream have lowest D, whereas populations from the same mountainside, mountain, and region show increasing values of D. Thus, gene flow is predominant along streams and a hierarchy of genetic relationships exists. It was expected that because this area was heavily glaciated during the Pleistocene, postglacial colonization by refugial populations would result in strong clusters of populations from adjacent streams sharing the same refugia. However, a dendrogram of genetic distances showed few statistically significant clusters of populations from different streams.

scholarly journals Three new Psammothidium species from lakes of Olympic and Cascade Mountains in Washington State, USA

Phytotaxa ◽  
2013 ◽  
Vol 127 (1) ◽  
pp. 49 ◽  
Author(s):  
MIHAELA D. ENACHE ◽  
MARINA POTAPOVA ◽  
RICH SHEIBLEY ◽  
PATRICK MORAN
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
High Elevation ◽  
Mountain Lakes ◽  
Washington State ◽  
Cascade Mountains ◽  
Cascade Mountain ◽  
Similarities And Differences ◽  
Scanning Electron ◽  
Silica Frustules

Populations of several Psammothidium species were found in core sediments from nine remote, high elevation, ultraoligotrophic and oligotrophic, Olympic and Cascade Mountain lakes. Three of these species, P. lacustre, P. alpinum, and P. nivale, are described here as new. The morphology of the silica frustules of these species was documented using light and scanning electron microscopy. We discuss the similarities and differences with previously described Psammothidium species.

scholarly journals INVESTIGATION OF LEWISIA TWEEDYI SEED ANATOMY AND SEEDCOAT-IMPOSED DORMANCY

HortScience ◽  
1996 ◽  
Vol 31 (3) ◽  
pp. 322b-322
Author(s):  
Christia M. Roberts
Keyword(s):  
North America ◽  
Washington State ◽  
Western North America ◽  
Cascade Mountains ◽  
Percent Germination ◽  
Commercial Crop ◽  
Axenic Conditions ◽  
A Minor ◽  
Herbaceous Perennial ◽  
Germination Requirements

Lewisia tweedyi (A. Gray) Robinson is an endangered, herbaceous perennial native to the Cascade Mountains of northern Washington state and southern British Columbia. It is highly valued as an ornamental, but has a reputation for being challenging to grow and is only cultivated by alpine specialists. The better known Lewisia species, L. cotyledon, is a minor commercial crop in some areas of Europe and western North America. Lewisias are members of the Centrospermae; a linear peripheral embryo surrounds centrally located perisperm. Lewisia tweedyi seed is distinct from all other lewisias in having a fleshy appendage, or caruncle. Germination practices include stratification for an unspecified period in a garden cold frame. In addition to a long germination period, percent germination is characteristically low. A number of tests, including sowing under axenic conditions, and combinations of prechill periods and liquid N scarification were conducted. Seedcoat-imposed dormancy and germination requirements have been determined.

scholarly journals New distributional data for the northern forestfly, Lednia borealis Baumann and Kondratieff, 2010 (Plecoptera: Nemouridae), Washington, USA

2021 ◽  
Author(s):  
Candace E. Fallon ◽  
Emilie Blevins ◽  
Michele Blackburn ◽  
Taylor B. Cotten ◽  
Derek W. Stinson
Keyword(s):  
Climate Change ◽  
Cold Water ◽  
High Elevation ◽  
Washington State ◽  
Distribution Data ◽  
Habitat Association ◽  
Cascade Mountains ◽  
Coi Barcoding ◽  
Distributional Information ◽  
Valid Taxon

ABSTRACTThe northern forestfly, Lednia borealis (Plecoptera: Nemouridae) is a rare montane stonefly believed to be endemic to Washington. The species, first recognized as a valid taxon in 2010, is the only member of the genus Lednia known from the state. Like other species in its genus, it is found in mid- to high-elevation cold water habitat, including lakes, glacial-fed streams, and rheocrenes (channelized springs). Lednia species in general appear to be rare or at least rarely collected. Because of their reliance on alpine and subalpine habitat, Lednia may be especially vulnerable to threats associated with climate change. However, relatively little is known about this species, and distribution data are scarce. From 2015 to 2019, 94 sites were surveyed in order to document unmapped populations of Lednia borealis to improve range and distributional information from montane areas of Washington State. In this paper, we share locations of L. borealis documented to date, including collections from eight newly documented Lednia sites in the Mt. Baker and Glacier Peak Wildernesses in the Cascade Mountains of Washington, and report recent COI barcoding results. We also provide updated details on the species’ distribution, highlight a confirmed habitat association with glacial edge meltwater, and provide recommendations for future surveys.

Sign in / Sign up

Export Citation Format

Share Document