Harrison Susan, Karban Richard
Department of Entomology, University of California, 95616, Davis, CA, USA.
Oecologia. 1986 Jun;69(3):354-359. doi: 10.1007/BF00377056.
Larvae of Platyprepia virginalis (Lep.: Arctiidae) and Orgyia vetusta (Lep.: Lymantriidae) feed on the foliage of bush lupine (Lupinus arboreus Sims) at Bodega Bay, California, USA, in February-April and May-July, respectively. Female O. vetusta attained lower pupal weights and produced fewer eggs on branches of L. arboreus which had experimentally received P. virginalis damage earlier in the same year, compared to those reared on control branches.Growth rates of first-instar O. vetusta were lower on undamaged leaves of previously damaged L. arboreus than on leaves of undamaged controls. This was true for lupine bushes damaged by P. virginalis in the field; and also for greenhouse-grown lupine plants damaged by Estigmene acrea (Lep.: Arctiidae) when excised foliage was used in the assay. However, fifth (last) instar female O. vetusta larvae showed no preference for damaged versus undamaged greenhouse-grown L. arboreus in their feeding or choice of a site for pupation.These experiments demonstrate the potential for competition-like interactions between herbivores mediated by changes in quality of the shared host.
在美国加利福尼亚州博德加湾，处女桦斑蛾（鳞翅目：灯蛾科）和老熟雪毒蛾（鳞翅目：毒蛾科）的幼虫分别在2 - 4月和5 - 7月取食羽叶豆（羽扇豆属乔木西姆斯）的叶片。与在对照枝条上饲养的相比，在同一年早些时候受到处女桦斑蛾实验性损害的羽叶豆枝条上，老熟雪毒蛾雌虫的蛹重较低，产卵量也较少。在先前受损的羽叶豆未受损叶片上，老熟雪毒蛾一龄幼虫的生长速度低于未受损对照叶片上的生长速度。对于田间受到处女桦斑蛾损害的羽扇豆灌木丛来说是这样；在试验中使用离体叶片时，对于温室种植的、受到黄猩猩灯蛾（鳞翅目：灯蛾科）损害的羽扇豆植株也是如此。然而，老熟雪毒蛾五龄（最后一龄）雌幼虫在取食或选择化蛹地点时，对温室种植的受损与未受损羽叶豆没有偏好。这些实验证明了食草动物之间可能通过共享宿主质量变化介导类似竞争的相互作用。
