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Resource pre-emption, rather than extending the growing season of native grass assemblages, reduces invasion by exotic species

Smith, Monique and Pound, Leanne M. and Facelli, Jose M. (2021). Resource pre-emption, rather than extending the growing season of native grass assemblages, reduces invasion by exotic species. Applied Vegetation Science. 24 , e12613
[Research article]

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Abstract

Questions: In Mediterranean-type systems, invasive C3 annual grasses appear early in the season and can pre-empt resources and attain a competitive dominance over native perennial grasses. Here, we investigated whether planting C3 and C4 native grasses (a) combined, so that resources are extracted over a longer period, or (b) at higher density would make planted communities more competitive against invasive species. Location: Para Woodlands Reserve, near Adelaide, South Australia. Methods: In 72 experimental plots, native grasses were planted in combinations of seasonal patterns (three levels; single-season assemblages with either C3 or C4 and extended season with both C3 and C4) and planting density (two levels; high = 44 plants/m2 and low = 20 plants/m2 ). Data were collected on native plant survival and biomass, invasive biomass and soil properties. Results: Overall, C3 native grasses were superior competitors against both invasive C3 grasses and native C4 grasses. We found no interaction between the combination of C3 and C4 grasses planted together and density of planting. Assemblages with higher densities were successful at reducing exotic plant biomass; however, there was a trade-off with reduced individual performance among the native plants. Even though individual plants were larger in the low-density treatment, total biomass was lower in these plots suggesting that density limits the growth of native communities as a whole. The C3 native plants were planted earlier than the C4 native plants because of differences in phenology and therefore likely pre-empted resources and gained a size advantage, making them the superior competitor. Conclusion: Native perennial grasses can outcompete exotic plants for resources if planted earlier in the season. This resource pre-emption appears to be more important than resource use over a longer period with C3 and C4 plants together and could be an effective restoration strategy.

Authors/Creators:Smith, Monique and Pound, Leanne M. and Facelli, Jose M.
Title:Resource pre-emption, rather than extending the growing season of native grass assemblages, reduces invasion by exotic species
Series Name/Journal:Applied Vegetation Science
Year of publishing :2021
Volume:24
Article number:e12613
Number of Pages:13
ISSN:1402-2001
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution-Noncommercial-No Derivative Works 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Keywords:annual grasses, competition, invasibility, life-history, Mediterranean-type climates, niche partitioning, perennial grasses, priority effects, resource pre-emption
URN:NBN:urn:nbn:se:slu:epsilon-p-114898
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-114898
Additional ID:
Type of IDID
DOI10.1111/avsc.12613
ID Code:26340
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Ecology
(S) > Dept. of Ecology
Deposited By: SLUpub Connector
Deposited On:20 Dec 2021 05:25
Metadata Last Modified:20 Dec 2021 06:01

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