Gene Flow and Genetic Structure of Whitebark Pine (Pinus Albicaulis)
Author | : Bryce A. Richardson |
Publisher | : |
Total Pages | : 122 |
Release | : 2001 |
Genre | : Whitebark pine |
ISBN | : |
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Author | : Bryce A. Richardson |
Publisher | : |
Total Pages | : 122 |
Release | : 2001 |
Genre | : Whitebark pine |
ISBN | : |
Author | : Andrew D. Bower |
Publisher | : |
Total Pages | : 11 |
Release | : 2008 |
Genre | : Biogeography |
ISBN | : |
Whitebark pine (Pinus albicaulis Engelm) has greatly declined throughout its range as a result of introduced disease, fire suppression, and other factors, and climate change is predicted to accelerate this decline. Restoration is needed; however, no information regarding the degree of local adaptation is available to guide these efforts. A seedling common-garden experiment was employed to assess genetic diversity and geographic differentiation (QST) of whitebark pine for traits involved in growth and adaptation to cold and to determine climatic variables revealing local adaptation. Seedlings from 48 populations were grown for two years and measured for height increment, biomass, root to shoot ratio, date of needle fl ush, fall and spring cold injury, and survival. Significant variation was observed among populations for most traits. The QST was low (0.07 ? 0.14) for growth traits and moderate (0.36 ? 0.47) for cold adaptation related traits, but varied by region. Cold adaptation traits were strongly correlated with mean temperature of the coldest month of population origins, while growth traits were generally correlated with growing season length. We recommend that seed transfer for restoration favor seed movement from milder to colder climates to a maximum of 1.9 ° C in mean annual temperature in the northern portion of the species range, and 1.0 ° C in the U. S. Rocky Mountains to avoid maladaptation to current conditions yet facilitate adaptation to future climates.
Author | : Filippos A. (Phil) Aravanopoulos |
Publisher | : MDPI |
Total Pages | : 333 |
Release | : 2018-11-23 |
Genre | : Science |
ISBN | : 3038972983 |
This book is a printed edition of the Special Issue "Genetics and Genomics of Forest Trees" that was published in Forests
Author | : Lynn M. Resler |
Publisher | : |
Total Pages | : 20 |
Release | : 2014 |
Genre | : Keystone species |
ISBN | : |
At some alpine treelines in the Rocky Mountains, whitebark pine (Pinus albicaulis)?a keystone species?plays a central role in tree island development through facilitation. Whitebark pine occurs both as a solitary tree and also as a component of tree islands, although relative importance of these two patterns varies geographically. We examine the utility of four predictive models to understand how the functional role of a keystone species varies spatially with biophysical conditions. We use a novel data set to predict whitebark pine's functional role, characterized by spatial association and relative position within a tree island at three North American Rocky Mountain treelines. For the study areas combined, and at a study area level, we compared prediction accuracy and variable importance among these modeling approaches: general linear models, classification and regression trees, random forests, and support vector machines. Results revealed that the keystone role of whitebark pine varied spatially. For the combined model, growing season temperature and slope curvature were the most important predictive variables for association and relative position, as revealed by overall agreement among the four models. Prediction accuracy and variable importance varied at the study area level, though, indicating that different conclusions could be drawn from each model, if examined independently. We advocate comparing results from different modeling approaches for complex, field-derived data sets because it might enable a better understanding of model and variable selection and appropriateness of input data resolution. Furthermore, comparative modeling enables assessment of the relative predictive and interpretive capacities of each modeling approach.
Author | : Paula E. Marquardt |
Publisher | : |
Total Pages | : 308 |
Release | : 2002 |
Genre | : Biodiversity |
ISBN | : |
Author | : Rebecca Dahlberg Piri |
Publisher | : |
Total Pages | : 58 |
Release | : 2019 |
Genre | : |
ISBN | : |
Foxtail pine (Pinus balfouriana) is a subalpine conifer endemic to California, notably separated into two disjunct subspecies. Previous studies have described the northern subspecies, Pinus balfouriana subsp. balfouriana, as having an uncommonly high level of genetic differentiation and no discernible spatial patterns in phenotypic variation. This study seeks to characterize the spatial genetic structure and patterns of selection of the northern subspecies (Pinus balfouriana subsp. balfouriana) using genome-wide data and to identify the influence of ecology and environment on the unique genetic patterns. I show that genetic differentiation among populations is much less than previously estimated (FST= 0.000644) and there is weak isolation-by-distance structure, but ongoing gene flow is unlikely. Within populations, stand density and competitor effects contribute to inbreeding. I also show that previously measured traits are predominantly determined by genetics. Analyzing by sliding window in the genome, I show that connectivity patterns vary widely throughout the genome and identify several areas that are important to the genetic architecture of the phenotypic traits and plasticity (GxE). Overall, there is high connectivity, genetic similarity, and genetically based trait variation among and within populations of the northern subspecies of foxtail pine due to historical processes, despite biotic interactions driving inbreeding. Persistent genetic isolation, however, may make adaptation to future climate a challenge for the subspecies.
Author | : John William Raeburn Zinck |
Publisher | : |
Total Pages | : 222 |
Release | : 2012 |
Genre | : White pine |
ISBN | : |