Show simple item record E. R. en_US George O. en_US 2010-03-12T16:32:28Z 2010-03-12T16:32:28Z 2009-04-01 en_US
dc.identifier en_US
dc.identifier.citation Saetnan , E R & Batzli , G O 2009 , ' Effects of simulated herbivory on defensive compounds in forage plants of Norwegian alpine rangelands ' Journal of Chemical Ecology , vol 35 , no. 4 , pp. 469-475 . , 10.1007/s10886-009-9616-6 , 10.1007/s10886-009-9616-6 en_US
dc.identifier.other PURE: 148941 en_US
dc.identifier.other dspace: 2160/4425 en_US
dc.description.abstract A field study on the effects of current grazing practices on plants in central Norway found no increase in either phenolic compounds or proteinase inhibitors in plants subjected to grazing by sheep. This could either reflect insufficient damage to the plants due to low grazing intensity or a lack of a long-term response of the plants to grazing. In this study, we tested the hypothesis that damage to forage plants used by sheep and rodents in Norwegian alpine rangelands can stimulate a long-term (at least 2-week) increase in levels of defensive compounds. We used clipping experiments to manipulate the severity and timing of damage to eight species of common plants used by herbivores in Norway. Under greenhouse conditions (i.e., climate-controlled), we subjected mature plants to one of four clipping treatments: control (0% leaf tissue removed), low (10–15% leaf tissue removed), high (70–75% leaf tissue removed), or sustained (15% of leaf tissue removed every other day up to a total removal of 75%, i.e., five clippings over 9 days). Samples were collected 2 weeks after final clipping and analyzed for concentrations of total phenolics, proteinase inhibitors, ratio of total phenolics to soluble proteins, and ratio of proteinase inhibitors to soluble plant proteins. As expected, the different species of plants responded differently to simulated herbivory, but most plants either showed no response to mechanical wounding and tissue loss or had reduced defensive compounds. Thus, our results do not support the hypothesis that herbivory induces a long-term increase in defensive compounds in alpine rangelands of Norway, a result consistent with those from field studies. en_US
dc.format.extent 7 en_US
dc.relation.ispartof Journal of Chemical Ecology en_US
dc.title Effects of simulated herbivory on defensive compounds in forage plants of Norwegian alpine rangelands en_US
dc.contributor.pbl Institute of Biological, Environmental and Rural Sciences en_US

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