Climate warming is expected to significantly affect plant-herbivore interactions. Even though direct effects of temperature on herbivores were extensively studied, indirect effects of temperature (acting via changes in host plant quality) on herbivore performance have rarely been addressed. We conducted multiple-choice feeding experiments with generalist herbivore Schistocerca gregaria feeding on six species of genus Impatiens cultivated at three different temperatures in growth chambers and a common garden. We also studied changes in leaf morphology and chemistry. We tested effects of temperature on plant palatability and assessed whether the effects could be explained by changes in the leaf traits. The leaves of most Impatiens species experienced the highest herbivory when cultivated at the warmest temperature. Traits related to leaf morphology (specific leaf area, leaf dry matter content and leaf area), but not to leaf chemistry, partly mediated the effects of temperature on plant palatability. Herbivores preferred smaller leaves with lower specific leaf area and higher leaf dry matter content. Our study suggests that elevated temperature will lead to changes in leaf traits and increase their palatability. This might further enhance the levels of herbivory under the increased herbivore pressure, which is forecasted as a consequence of climate warming.

Department of Botany Faculty of Science Charles University Benátská 2 128 01 Prague Czech Republic Department of Biodiversity Research Global Change Research Centre The Czech Academy of Sciences Bělidla 4a 603 00 Brno Czech Republic

Institute of Botany The Czech Academy of Sciences Zámek 1 252 43 Průhonice Czech Republic Department of Botany Faculty of Science Charles University Benátská 2 128 01 Prague Czech Republic

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$a Dostálek, Tomáš $u Institute of Botany, The Czech Academy of Sciences, Zámek 1, 252 43, Průhonice, Czech Republic. tomas.dostalek@ibot.cas.cz. Department of Botany, Faculty of Science, Charles University, Benátská 2, 128 01, Prague, Czech Republic. tomas.dostalek@ibot.cas.cz.

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$a Plant palatability and trait responses to experimental warming / $c T. Dostálek, MB. Rokaya, Z. Münzbergová,

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$a Climate warming is expected to significantly affect plant-herbivore interactions. Even though direct effects of temperature on herbivores were extensively studied, indirect effects of temperature (acting via changes in host plant quality) on herbivore performance have rarely been addressed. We conducted multiple-choice feeding experiments with generalist herbivore Schistocerca gregaria feeding on six species of genus Impatiens cultivated at three different temperatures in growth chambers and a common garden. We also studied changes in leaf morphology and chemistry. We tested effects of temperature on plant palatability and assessed whether the effects could be explained by changes in the leaf traits. The leaves of most Impatiens species experienced the highest herbivory when cultivated at the warmest temperature. Traits related to leaf morphology (specific leaf area, leaf dry matter content and leaf area), but not to leaf chemistry, partly mediated the effects of temperature on plant palatability. Herbivores preferred smaller leaves with lower specific leaf area and higher leaf dry matter content. Our study suggests that elevated temperature will lead to changes in leaf traits and increase their palatability. This might further enhance the levels of herbivory under the increased herbivore pressure, which is forecasted as a consequence of climate warming.

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$a Rokaya, Maan Bahadur $u Department of Botany, Faculty of Science, Charles University, Benátská 2, 128 01, Prague, Czech Republic. Department of Biodiversity Research, Global Change Research Centre, The Czech Academy of Sciences, Bělidla 4a, 603 00, Brno, Czech Republic.

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$a Münzbergová, Zuzana $u Institute of Botany, The Czech Academy of Sciences, Zámek 1, 252 43, Průhonice, Czech Republic. Department of Botany, Faculty of Science, Charles University, Benátská 2, 128 01, Prague, Czech Republic.

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