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Indirect food web effects of Bythotrephes invasion: responses by the rotifer Conochilus in Harp Lake, Canada

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Variation in the establishment of a non-native annual grass influences competitive interactions with Mojave Desert perennials

The invasiveness of an introduced species does not predict its impact

Establishment and spread of founding populations of an invasive thistle: the role of competition and seed limitation

Experimental evidence for an alkali ecotype of Lolium multiflorum, an exotic invasive annual grass in the Central Valley, CA, USA

Timing and extent of tissue removal affect reproduction characteristics of an invasive species Heracleum mantegazzianum

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Variation in the establishment of a non-native annual grass influences competitive interactions with Mojave Desert perennials

Content Provider	Springer Nature Link
Author	DeFalco, Lesley A. Fernandez, George C. J. wak, Robert S.
Copyright Year	2006
Abstract	Competition between native and non-native species can change the composition and structure of plant communities, but in deserts, the highly variable timing of resource availability also influences non-native plant establishment, thus modulating their impacts on native species. In a field experiment, we varied densities of the non-native annual grass Bromus madritensis ssp. rubens around individuals of three native Mojave Desert perennials—Larrea tridentata, Achnatherum hymenoides, and Pleuraphis rigida—in either winter or spring. For comparison, additional plots were prepared for the same perennial species and seasons, but with a mixture of native annual species as neighbors. Growth of perennials declined when Bromus was established in winter because Bromus stands had 2–3 months of growth and high water use before perennial growth began. However, water potentials for the perennials were not significantly reduced, suggesting that direct competition for water may not be the major mechanism driving reduced perennial growth. The impact of Bromus on Larrea was lower than for the two perennial grasses, likely because Larrea maintains low growth rates throughout the year, even after Bromus has completed its life cycle. This result contrasts with the perennial grasses, whose phenology completely overlaps with (Achnatherum) or closely follows (Pleuraphis) that of Bromus. In comparison, Bromus plants established in spring were smaller than those established in winter and thus did not effectively reduce growth of the perennials. Growth of perennials with mixed annuals as neighbors also did not differ from those with Bromus neighbors of equivalent biomass, but stands of these native annuals did not achieve the high biomass of Bromus stands that were necessary to reduce perennial growth. Seed dormancy and narrow requirements for seedling survivorship of native annuals produce densities and biomass lower than those achieved by Bromus; thus, impacts of native Mojave Desert annuals on perennials are expected to be lower than those of Bromus.
Starting Page	293
Ending Page	307
Page Count	15
File Format	PDF
ISSN	13873547
Journal	Biological Invasions
Volume Number	9
Issue Number	3
e-ISSN	15731464
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2006-11-21
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Creosote bush Galleta grass Indian ricegrass Invasive species Plant competition Plant Sciences Forestry Zoology Hydrobiology Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology Ecology, Evolution, Behavior and Systematics

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Variation in the establishment of a non-native annual grass influences competitive interactions with Mojave Desert perennials

SEASONALITY OF ANNUAL PLANT ESTABLISHMENT INFLUENCES THE INTERACTIONBETWEEN THE NON-NATIVE ANNUAL GRASS BROMUS MADRITENSIS SSP. RUBENS AND MOJAVE DESERT PERENNIALS

Establishment and Control of Hay-scented Fern: A Native Invasive Species

Habitat Invasibility and Dominance by Alien Annual Plants in the Western Mojave Desert

Mechanisms underlying the impacts of exotic annual grasses in a coastal California meadow

Effects of Nitrogen and Salinity on Growth and Competition Between a Native Grass and an Invasive Congener

Desert wildfire impacts on plant community function

Short-term soil inorganic N pulse after experimental fire alters invasive and native annual plant production in a Mojave Desert shrubland

Effects of natural and anthropogenic gradients on native and exotic winter annuals in a southern California Desert

Variation in the establishment of a non-native annual grass influences competitive interactions with Mojave Desert perennials

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Variation in the establishment of a non-native annual grass influences competitive interactions with Mojave Desert perennials