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Adaptive advantages of dietary mixing different-aged foliage within conifers for a generalist defoliator

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Ecological Research

Abstract

Few herbivores are well adapted to feeding on all foliage age classes available and most have evolved traits that are attuned to the characteristics of either developing or mature foliage; however, recent evidence has shown a number of insect herbivores that may mix different-aged foliage as a means of enhancing fitness. We carried out a series of laboratory and field experiments to investigate whether larvae of Asian gypsy moth [L. umbrosa (Butler) = L. dispar hokkaidoensis Goldschmidt] (Lepidoptera: Lymantriidae) engage in and benefit from foliage-age dietary mixing in common conifer species that naturally occur in its native range of Hokkaido, Japan. In a laboratory experiment, early instar larvae were observed on both developing and mature foliage when both age classes were available; however, larval survival and weight were highest on hosts with developing foliage available (larch, fir, and pine), whereas all larvae died on spruce where only mature foliage was available. In contrast, laboratory and field experiments indicated that late-instar larvae often consumed both developing and mature foliage on all conifer species studied, although there was general preference bias towards mature foliage. Field bioassays indicated that late-instar larvae provided both foliage age classes (a ‘mixed’ diet) had similar performance to those provided only developing or mature foliage. Results of this study indicate that larvae obtain limited performance benefits from mixing different foliage age-classes into their diet, other than perhaps the benefits accrued from having a broader resource pool available on a single host tree.

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Acknowledgments

We thank A. Komatsu for processing foliage for chemical analyses. We are also grateful to T. Yamaguchi for allowing us to use his Japanese larch stand for manipulative experiments, and to D. Carleton, E. Moise, D. Quiring, C. Simpson, J. Sweeney, Z. Sylvain, and several anonymous reviewers for comments on earlier versions of the manuscript. Financial support was provided through the Japanese Society for the Promotion of Science and from a JSPS Postdoctoral Fellowship for Foreign Researchers (25252030 and 19.07779).

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Author notes

  1. Rob C. Johns

    Present address: Natural Resources Canada, Canadian Forest Service - Atlantic Forestry Centre, 1350 Regent Street, PO Box 4000, Fredericton, NB, E3B 5P7, Canada

  2. Hiroyuki Tobita

    Present address: Forestry and Forest Products Research Institute, 1 Matsunosato, Tsukuba, Ibaraki, 305-8687, Japan

Authors and Affiliations

  1. Hokkaido Research Center, Forestry and Forest Products Research Institute, 7 Hitsujigaoka, Toyohira, Sapporo, Hokkaido, 062-8516, Japan

    Rob C. Johns, Hiroyuki Tobita & Kenichi Ozaki

  2. Hokkaido Forestry Research Institute, Kôsyunai, Bibai, Hokkaido, 079-0198, Japan

    Hideho Hara

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  1. Rob C. Johns
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  2. Hiroyuki Tobita
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  4. Kenichi Ozaki
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Correspondence to Rob C. Johns.

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Johns, R.C., Tobita, H., Hara, H. et al. Adaptive advantages of dietary mixing different-aged foliage within conifers for a generalist defoliator. Ecol Res 30, 793–802 (2015). https://doi.org/10.1007/s11284-015-1280-4

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