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Satellite patches, patch expansion, and doubling time as decision metrics for invasion control: Pennisetum ciliare expansion in southwestern Arizona

Published online by Cambridge University Press:  01 May 2019

Jaron D. Weston ,
Mitchel P. McClaran Open the ORCID record for Mitchel P. McClaran [Opens in a new window] ,
Richard K. Whittle ,
Christian W. Black  and
Jeffrey S. Fehmi Open the ORCID record for Jeffrey S. Fehmi [Opens in a new window]
Jaron D. Weston
Affiliation:
Graduate Student, University of Arizona, School of Natural Resources and the Environment, Tucson, AZ, USA
Mitchel P. McClaran
Affiliation:
Professor, University of Arizona, School of Natural Resources and the Environment, Tucson, AZ, USA
Richard K. Whittle
Affiliation:
Wildlife Biologist, 56th Range Management Office, U.S. Air Force, Luke AFB, AZ, USA
Christian W. Black
Affiliation:
Geographer, 56th Range Management Office, U.S. Air Force, Luke AFB, AZ, USA
Jeffrey S. Fehmi*
Affiliation:
Professor, University of Arizona, School of Natural Resources and the Environment, Tucson, AZ, USA
*
*Author for correspondence: J. Fehmi, University of Arizona, 1064 E. Lowell Street, Tucson, AZ 85719. (Email: [email protected])
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Abstract

Essential variables to consider for an efficient control strategy for invasive plants include dispersion pattern (i.e., satellite or invasion front) and patch expansion rate. These variables were demonstrated for buffelgrass [Pennisetum ciliare (L.) Link], a C4 perennial grass introduced from Africa, which has invaded broadly around the world. The study site was along a roadway in southern Arizona (USA). The P. ciliare plant distributions show the pattern of clumping associated with the satellite (nascent foci) colonization pattern (average nearest neighbor test, z-score −47.2, P<0.01). The distance between patches ranged from 0.743 to 12.8 km, with an average distance between patches of 5.6 km. Median patch expansion rate was 271% over the 3-yr monitoring period versus 136% found in other studies of established P. ciliare patches. Targeting P. ciliare satellite patches as a control strategy may exponentially reduce the areal doubling time, while targeting the largest patches may have less effect on the invasion speed.

Keywords

Catherine Jarnevich, U.S. Geological SurveyClustered patterninvasive speciesmanagement strategyseed dispersionSonoran Desert.
Type
Research Article
Information
Invasive Plant Science and Management , Volume 12 , Issue 1 , March 2019 , pp. 36 - 42
Copyright
© Weed Science Society of America, 2019 

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