02664nas a2200205   4500008004100000020001400041245011900055210006900174260001200243300001200255490000600267520199000273100002102263700002202284700002602306700002602332700002102358700002202379856005702401       2011                        eng d  a1939-729100aRelationships of Native Desert Plants with Red Brome (Bromus rubens): Toward Identifying Invasion-Reducing Species0 aRelationships of Native Desert Plants with Red Brome Bromus rube  cJan-Mar  a115-1240 v43 a<p>The interactions between native and exotic species occur on a continuum from facilitative to competitive. A growing thrust in invasive species science is differentiating where particular native species occur along this continuum, with practical implications for identifying species that might reduce the invasibility of ecosystems. We used a greenhouse experiment to develop a competitive hierarchy of 27 native species with red brome, an invasive annual grass in the arid lands of the southwestern United States, and a field study to assess in situ responses of brome to native perennial species in the Mojave Desert. Native species most competitive with brome in the competition experiment included the annuals Esteve&#39;s pincushion and western fiddleneck and the perennials eastern Mojave buckwheat, sweetbush, and brittlebush, which reduced brome biomass to 49 to 70% of its grown-alone amount. There was no clear difference in competitive abilities with brome between annual and perennial natives, and competiveness was not strongly correlated (r = 0.15) with the biomass of the native species. In the field, sweetbush and brittlebush supported among the least cover of brome, suggesting congruence of the strong early competitive abilities of these species with in situ patterns of brome distribution. At the other extreme, brome attained its highest average cover (19%) below littleleaf ratany, significantly greater than all but 3 of the 16 species evaluated. Cover by brome was only weakly related (r = 0.19) to the area of the perennial canopy, suggesting that factors other than the sizes of perennial plants were linked to differences in brome cover among species. Results suggest that (1) interactions with brome differ substantially among native species, (2) these interactions are not as closely linked to biomass production as in more temperate regions, and (3) there is potential for identifying native species that can reduce invasion of desert ecosystems.</p>
1 aAbella, Scott, R1 aCraig, Donovan, J1 aChiquoine, Lindsay, P1 aPrengaman, Kathryn, A1 aSchmid, Sarah, M1 aEmbrey, Teague, M  uhttps://giasipartnership.myspecies.info/en/node/9223