Influence of avian predation on a grasshopper (Orthoptera: Acrididae) assemblage that feeds on threadleaf snakeweed
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Authors: K. T. Gardner, and D. C. Thompson
Date: 1998
Journal: Environmental Entomology
Volume: 27
Number: 1
Pages: 110-116
Summary of Methods: This study on the Buenos Aires National Refuge in south central Arizona examined the effects of bird predation on grasshoppers that feed on broom snakeweed (Gutierrezia sarothrae) and threadleaf snakeweed (Gutierrezia microcephala). Grasshopper (Hesperotettix viridis and Melanoplus aridus) densities of both adutls and nymphs were counted on 12 paired plots (non-caged and caged) over three years to determine the effect of bird predation on these insect populations.
Article Summary / Main Points: Grasshopper populations were higher on caged plots than non-caged plots. Density of H. viridis, adults and nymphs was higher in caged plots than non-caged plots. Birds predation may be a deterrent to using grasshoppers as a biocontrol agent on snakeweed species.
Vegetation Types: Desert Shrublands
MLRA Ecoregions: 40 Sonoran Basin and Range 41 Southeastern Arizona Basin and Range
Agrovoc Control Words: Weeds Rangelands Insects
Article Review Type: refereed
Article Type: Experimental Research
Keywords: hesperotettix viridis, melanoplus aridus, gutierrezia microcephala, avian predation, biological control, rangeland weeds, broom snakeweed, gutierrezia sarothrae, insect herbivory, threadleaf snakeweed
Annotation: Much of this study focused on bird and grasshopper populations and dynamics rather than on the impact to the weed populations. Therefore this article has limited applicability to this database.
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