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Science 31 May 1985:
Vol. 228. no. 4703, pp. 1089 - 1091
DOI: 10.1126/science.228.4703.1089
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Articles

Chronic Herbivory: Impacts on Architecture and Sex Expression of Pinyon Pine

THOMAS G. WHITHAM 1 and SUSAN MOPPER 1

1 Department of Biological Sciences, Northern Arizona University, Flagstaff 86011

Pinyon pine, Pinus edulis (Engelm.), in Northern Arizona is exposed to recurring high levels of herbivory by the moth Dioryctria albovitella (Hust.). During a 3-year period, infested trees experienced on average a 30 percent reduction in annual shoot production. This herbivory affects tree architecture, growth rate, reproductive output, and sexual expression. Less infested trees produce 47 percent more trunk wood, 43 percent more branch wood, and are monoecious. Architectural changes in infested trees can result infunctionally male plants due to a complete loss of normal female cone-bearing ability. When herbivores are experimentally removed, normal growth and reproduction patterns resume. These strong herbivore impacts should represent a potent selection pressure in the evolution of host traits.

Submitted on November 8, 1984
Accepted on February 26, 1985


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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Science. ISSN 0036-8075 (print), 1095-9203 (online)