| variability in thermal response of primed and non-primed seeds of squirreltail [elymus elymoides (raf.) swezey and elymus multisetus (j. g. smith) m. e. jones]. | bottlebrush squirreltail [elymus elymoides (raf.) swezey = sitanion hystrix (nutt.) j. g. smith] and big squirrel-tail [elymus multisetus (j. g. smith) m. e. jones = sitanion jubatum (j. g. smith)] have a broad geographical distribution and have been identified as high priority species for restoration of degraded rangelands in the western united states. these rangelands exhibit high annual and seasonal variability in seedbed microclimate. the objective of this study was to examine variability in ... | 2002 | 12096743 |
| facilitation and interference of seedling establishment by a native legume before and after wildfire. | in semi-arid ecosystems, heterogeneous resources can lead to variable seedling recruitment. existing vegetation can influence seedling establishment by modifying the resource and physical environment. we asked how a native legume, lupinus argenteus, modifies microenvironments in unburned and burned sagebrush steppe, and if l. argenteus presence facilitates seedling establishment of native species and the non-native annual grass, bromus tectorum. field treatments examined mechanisms by which l. a ... | 2012 | 21833643 |
| the adaptive value of remnant native plants in invaded communities: an example from the great basin. | changes in the species composition of biotic communities may alter patterns of natural selection occurring within them. native perennial grass species in the intermountain west are experiencing a shift in the composition of interspecific competitors from primarily perennial species to an exotic, annual grass. thus traits that confer an advantage to perennial grasses in the presence of novel annual competitors may evolve in invaded communities. here i show that such traits are apparent in populat ... | 2008 | 18686583 |
| competitive seedlings and inherited traits: a test of rapid evolution of elymus multisetus (big squirreltail) in response to cheatgrass invasion. | widespread invasion by bromus tectorum (cheatgrass) in the intermountain west has drastically altered native plant communities. we investigated whether elymus multisetus (big squirreltail) is evolving in response to invasion and what traits contribute to increased performance. seedlings from invaded areas exhibited significantly greater tolerance to b. tectorum competition and a greater ability to suppress b. tectorum biomass than seedlings from adjacent uninvaded areas. to identify potentially ... | 2011 | 25567997 |
| origin of the h genome in sth-genomic elymus species based on the single-copy nuclear gene dmc1. | previous studies have suggested that the h haplome in elymus could originate from different diploid hordeum species, however, which diploid species best represent the parental species remains unanswered. the focus of this study seeks to pinpoint the origin of the h genome in elymus. allopolyploid elymus species that contain the sth genome were analyzed together with diploid hordeum species and a broad sample of diploid genera in the tribe triticeae using dmc1 sequences. both parsimony and maximu ... | 2011 | 21848405 |