期刊
AMERICAN JOURNAL OF BOTANY
卷 89, 期 9, 页码 1401-1409出版社
BOTANICAL SOC AMER INC
DOI: 10.3732/ajb.89.9.1401
关键词
experimental methods; herbivory uncertainty principle; old-field; thigmomorphogenesis; visitation effect
Although animal scientists have long been aware that methods used to measure an experimental system can affect the subject of measurements similar confounding effects of commonly used field methods have only recently been acknowledged by plant ecologists. Here we demonstrate significant effects of weekly visitation (walking up to a focal plant) and handling (taking morphological measures) on plant growth and herbivory in an old-field community. Of the three species examined, Apocynum cannabinum. was the most severely affected by our treatments. For Apocynum, weekly visitations resulted in a positive relationship between initial and final size, which did not occur in the unvisited plants. Visitation also increased leaf herbivory, resulting in a reduced leaf:stem biomass ratio. Handling the plants nearly doubled the proportion of individuals with a stem borer emergence hole. Growth of the other species in this study, Potentilla recta and Erigeron philadelphicus, was altered by either visitation, or visitation plus handling. Visiting plants in order to observe them and touching them as one would when making morphological measurements can have important biological consequences. We suggest that plant ecologists treat repeated entry into a natural system as a research method, subject to the same scrutiny and justification as all other experimental methods.
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