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Abundance of leafminers and leaf area loss by chewing herbivores in hybrids between Quercus crispula and Quercus dentata

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We examined responses of phytophagous insects to hybrids between Quercus crispula Blume and Quercus dentata Thunberg in a natural population in northern Japan. The abundance of leafminers and leaf area loss by chewing insects in hybrids were intermediate between those in the parental species (additive mode), close to those of either of the parental species (dominance mode), or similar to those of both parental species (no difference). Hybrids were neither more susceptible nor resistant to the insect herbivores we monitored. In Phyllonorycter (Gracillariidae) species, which are specialized to either of the parental oak species, the mortality of sap-feeding early instar larvae did not differ between hybrids and the parental species. The abundance of four leafminer taxa was correlated with environmental conditions (i.e., distance from the coastal edge of the forest or the timing of budbreak) as well as genetic factors.

Les auteurs ont étudié la réaction des insectes phytophages sur des hybrides entre Quercus crispula Blume et Quercus dentata Thunberg dans une population naturelle du nord du Japon. L'abondance des mineuses des feuilles et les pertes de surface foliaire causées par les insectes herbivores étaient soit à mi-chemin entre les pertes subies par les parents (mode additif), soit assez semblables aux pertes subies par l'un ou l'autre des parents (mode de dominance) ou semblables aux pertes subies par les deux parents (aucune différence). Les hybrides étaient ni plus susceptibles, ni plus résistants aux insectes herbivores qu'ils ont suivis. Dans le cas des espèces de Phyllonorycter (Gracillariidae) qui sont spécifiques à l'une ou l'autre des espèces parentales de chêne, la mortalité chez les premiers stades larvaires qui se nourrissent de la sève était similaire sur les hybrides et les espèces parentales de chêne. L'abondance de quatre taxons de mineuses des feuilles était corrélée avec les conditions environnementales (c.-à-d. la distance de la bordure de la forêt du côté du littoral ou le moment de l'éclosion des bourgeons) aussi bien qu'avec les facteurs génétiques.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2004-12-01

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