The elevated concentration of atmospheric CO_(2)may result in a decline of leaf nutritional quality(especially N)and an increase in some kinds of defensive secondary components(such as phenolics).The changes in the ph...The elevated concentration of atmospheric CO_(2)may result in a decline of leaf nutritional quality(especially N)and an increase in some kinds of defensive secondary components(such as phenolics).The changes in the phytochemistry of trees,combined with the effect of elevated CO_(2)per se,have a potential negative influence on insect herbivores.Here,we review the effect of elevated CO_(2)on the performance of leaf-feeding forest insects at individual-level and commun-ity-level.The elevated CO_(2)per se have little influence on the metabolism of insects.Over half of the tree-insect experimental systems show that the performance of individual insect become poorer under high-CO_(2)grown trees;but the others show that the insects have just little or no response to the treatments.The direction and magnitude of the changes in the performance of insects could be mediated by various factors.The effects of treatment are strongly species-dependent.The mag-nitude of changes in the phytochemistry,the sensitivity and adaptive capacity of insects to the poorer leaf quality,the differences in plant growth conditions and experimental methods,and the mediated effects of other environmental factors(such as soil nutrient availability,light,temperature,O_(3))were all closely related to the final performance of insects.However,the larvae’s consumption usually increased under enriched CO_(2)treatment,which was widely thought to be a compens-atory response to poorer plant quality.The experiments on forest community-level found identically a reduction in herbivory,which was contrary to the results from small-scale experiments.The changes in insect popu-lation and the actual response of consumption by leaf-feeding forest insects under CO_(2)enrichment remain unclear,and more field-based experiments need to be conducted.展开更多
基金The research was supported by the National Natural Science Foundation of China(Grant No.30670306)the Knowledge Innovation Program of Chinese Academy of Sciences(No.KZCX1-SW-19)Open Foundation of Changbai Mountain Forest Ecosystem Research Station of Chinese Academy of Sciences.
文摘The elevated concentration of atmospheric CO_(2)may result in a decline of leaf nutritional quality(especially N)and an increase in some kinds of defensive secondary components(such as phenolics).The changes in the phytochemistry of trees,combined with the effect of elevated CO_(2)per se,have a potential negative influence on insect herbivores.Here,we review the effect of elevated CO_(2)on the performance of leaf-feeding forest insects at individual-level and commun-ity-level.The elevated CO_(2)per se have little influence on the metabolism of insects.Over half of the tree-insect experimental systems show that the performance of individual insect become poorer under high-CO_(2)grown trees;but the others show that the insects have just little or no response to the treatments.The direction and magnitude of the changes in the performance of insects could be mediated by various factors.The effects of treatment are strongly species-dependent.The mag-nitude of changes in the phytochemistry,the sensitivity and adaptive capacity of insects to the poorer leaf quality,the differences in plant growth conditions and experimental methods,and the mediated effects of other environmental factors(such as soil nutrient availability,light,temperature,O_(3))were all closely related to the final performance of insects.However,the larvae’s consumption usually increased under enriched CO_(2)treatment,which was widely thought to be a compens-atory response to poorer plant quality.The experiments on forest community-level found identically a reduction in herbivory,which was contrary to the results from small-scale experiments.The changes in insect popu-lation and the actual response of consumption by leaf-feeding forest insects under CO_(2)enrichment remain unclear,and more field-based experiments need to be conducted.
