177 research outputs found
An Integrative Model of Graduate Education in Biodiversity Conservation and Sustainable Production in Fragmented Landscapes
To achieve biodiversity conservation and sustainable production in anthropogenically fragmented landscapes, scientists need to be trained in a holistic fashion that emphasizes integration and interdisciplinary collaboration. Traditional graduate programs in natural resources, conservation biology and agricultural sciences usually fall short of this goal as they train scientists with research knowledge and skills in narrowly defined disciplines. Rarely, if ever, is integration across disciplines facilitated, valued, or emphasized in either coursework or research activities
Isolation, purification, and full NMR assignments of cyclopamine from Veratrum californicum
The Hedgehog signaling pathway is essential for embryogenesis and for tissue homeostasis in the adult. However, it may induce malignancies in a number of tissues when constitutively activated, and it may also have a role in other forms of normal and maladaptive growth. Cyclopamine, a naturally occurring steroidal alkaloid, specifically inhibits the Hedgehog pathway by binding directly to Smoothened, an important Hedgehog response element. To use cyclopamine as a tool to explore and/or inhibit the Hedgehog pathway in vivo, a substantial quantity is required, and as a practical matter cyclopamine has been effectively unavailable for usage in animals larger than mice
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Major indicator shrubs and herbs in riparian zones on national forests of central Oregon
Genotyping-by-Sequencing and Ecological Niche Modeling Illuminate Phylogeography, Admixture, and Pleistocene Range Dynamics in Quaking Aspen (Populus Tremuloides)
Populus tremuloides is the widestâranging tree species in North America and an ecologically important component of mesic forest ecosystems displaced by the Pleistocene glaciations. Using phylogeographic analyses of genomeâwide SNPs (34,796 SNPs, 183 individuals) and ecological niche modeling, we inferred population structure, ploidy levels, admixture, and Pleistocene range dynamics of P. tremuloides, and tested several historical biogeographical hypotheses. We found three genetic lineages located mainly in coastalâCascades (cluster 1), eastâslope CascadesâSierra NevadasâNorthern Rockies (cluster 2), and U.S. Rocky Mountains through southern Canadian (cluster 3) regions of the P. tremuloides range, with tree graph relationships of the form ((cluster 1, cluster 2), cluster 3). Populations consisted mainly of diploids (86%) but also small numbers of triploids (12%) and tetraploids (1%), and ploidy did not adversely affect our genetic inferences. The main vector of admixture was from cluster 3 into cluster 2, with the admixture zone trending northwest through the Rocky Mountains along a recognized phenotypic cline (Utah to Idaho). Clusters 1 and 2 provided strong support for the âstableâedge hypothesisâ that unglaciated southwestern populations persisted in situ since the last glaciation. By contrast, despite a lack of clinal genetic variation, cluster 3 exhibited âtrailingâedgeâ dynamics from niche suitability predictions signifying complete northward postglacial expansion. Results were also consistent with the âinland dispersal hypothesisâ predicting postglacial assembly of Pacific Northwestern forest ecosystems, but rejected the hypothesis that Pacificâcoastal populations were colonized during outburst flooding from glacial Lake Missoula. Overall, congruent patterns between our phylogeographic and ecological niche modeling results and fossil pollen data demonstrate complex mixtures of stableâedge, refugial locations, and postglacial expansion within P. tremuloides. These findings confirm and refine previous genetic studies, while strongly supporting a distinct Pacificâcoastal genetic lineage of quaking aspen
Field Guide to the Willows of East-Central Idaho
The guide identifies willows present in east-central Idaho, explains how to recognize them in the field, and provides information on their abundance, distribution, and morphologic data. It includes maps, illustrations, photographs of leaves, and color photographs of different species
The Morphological and Genetic Distinctness of Botrychium minganense and B. crenulatum as Assessed by Morphometric Analysis and RAPD Markers
Volume: 92Start Page: 249End Page: 26
CYTOLOGICAL, MORPHOLOGICAL, ECOLOGICAL AND PHENOLOGICAL SUPPORT FOR SPECIFIC STATUS OF CRATAEGUS SUKSDORFII (ROSACEAE)
Volume: 37Start Page: 274End Page: 28
Notes On Betula Ser. Humiles (Betulaceae) in Idaho
Volume: 33Start Page: 147End Page: 14
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