Primary and secondary host plants differ in leaf-level photosynthetic response to herbivory: evidence from Alnus and Betula grazed by the alder beetle, Agelastica alni

agelastica alni alnus glutinosa alnus incana amidon arbre betula pendula chrysomelidae coleoptera defence mechanisms defoliation efficiency eficacia gas exchange host plants hosts intercambio de gases leaf area mecanismos de defensa pests of plants phenolic compounds photosynthese photosynthesis plagas de plantas plant water relations ravageur des plantes relaciones planta agua relation plante eau starch superficie foliar surface foliaire transpiration transport par eau transporte por agua trees uso del agua utilisation de l'eau water use