Response of galling insects to natural browsing by mammals in Alaska [Salix novae-angliae, Lepus americanus, Alces alces, Phyllocolpa]

alaska alce browsing elks field experimentation gall causing insects hares host pathogen relations insecte gallicole insectos causantes de agallas largura length liebre longueur plant animal relations populus balsamifera ramoneo relaciones planta animal relation plante animal salix stems tallo tenthredinidae tige