Oecologia

, Volume 137, Issue 3, pp 392–398

Prolonged diapause of specialist seed-feeders makes predator satiation unstable in masting of Quercus crispula

Plant Animal Interactions

Abstract

Quercus crispula (=Q. mongolica var. grosseserrata) is the predominant tree species in cool temperate, mixed broadleaf/conifer forests in northern Japan. We compared 11 years of data on acorn production in a population of Q. crispula, with data on seed-insect populations, to try to answer the following questions: (1) Does Q. crispula show a regular pattern of masting? (2) How long do principal seed predators remain in diapause? (3) How do the seed predators affect the pattern of predator satiation? Q. crispula showed a tendency to alternate bearing, with significant synchrony between individual trees. The principal acorn-feeding insects (Curculio spp. weevils), which infested 25%–70% of matured acorns, generally exhibited a prolonged diapause of 2 years. No significant negative relationship was found between the rate of injury by the weevils and the density of mature acorns, indicating that simple predator satiation fails due to the synchrony of the life-cycle of acorn-feeding insects and the periodical production of acorns. However, the rate of injury by the weevils was negatively correlated with the relative abundance of mature acorns to the number of weevil larvae that had matured 2 years previously. Thus, the proportion of sound acorns notably increased in a rich crop after a disturbance in alternate bearing. Prolonged diapause of specific seed predators is critical in determining the peak year of sound-seed production.

Keywords

Acorn production Curculio Insect life-cycle Mast fruiting Seed predation 

References

  1. Brezner J (1960) Biology, ecology, and taxonomy of insects infesting acorns. Univ Mo Agr Exp Sta Res Bull 726:1–40Google Scholar
  2. Crawley MJ, Long CR (1995) Alternate bearing, predator satiation and seedling recruitment in Quercus robur L. J Ecol 83:683–696Google Scholar
  3. Fukumoto H, Kajimura H (2001) Guild structures of seed insects in relation to acorn development in two oak species. Ecol Res 16:145–155CrossRefGoogle Scholar
  4. Hanski I (1988) Four kinds of extra long diapause in insects: a review of theory and observations. Ann Zool Fenn 25:37–53Google Scholar
  5. Harris MK, Chung CS, Jackman JA (1996) Masting and pacan interaction with insectan predehiscent nut feeders. Environ Entomol 25:1068–1076Google Scholar
  6. Horikawa Y (1972) Atlas of the Japanese flora. Gakken, TokyoGoogle Scholar
  7. Houle G (1999) Mast seeding in Abies balsamea, Acer saccharum and Betula alleghaniensis in an old growth, cold temperate forest of north-eastern North America. J Ecol 87:413–422Google Scholar
  8. Imada M, Nakai T, Nakamura T, Mabuchi T, Takahashi Y (1990) Acorn dispersal in natural stands of mizunara (Quercus mongolica var. grosseserrata) for twenty years. J Jpn For Soc 72:426–430Google Scholar
  9. Janzen DH (1971) Seed predation by animals. Annu Rev Ecol Syst 2:465–492CrossRefGoogle Scholar
  10. Kanazawa Y (1975) Production, dispersal and germination of acorns in natural stands of Quercus crispula—a preliminary report. J Jpn For Soc 57:209–214Google Scholar
  11. Kanazawa Y (1982) Some analyses of the reproduction process of a Quercus crispula Blume population in Kikko. I. A record of acorn dispersal and seedling establishment for several years at three natural stands. Jpn J Ecol 32:325–331Google Scholar
  12. Kelly D (1994) The evolutionary ecology of mast seeding. Trends Ecol Evol 9:465–470Google Scholar
  13. Kelly D, Sullivan JJ (1997) Quantifying the benefits of mast seeding on predation satiation and wind pollination in Chionochloa pallens (Poaceae). Oikos 78:143–150Google Scholar
  14. Kikuzawa K (1991) Mizunara (Quercus crispula). Koshunai Q 85:23–25Google Scholar
  15. Koenig WD, Knops JM (1998) Scale of mast-seeding and tree-ring growth. Nature 396:225–226CrossRefGoogle Scholar
  16. Koenig WD, Mumme RL, Carmen WJ, Stanback MT (1994) Acorn production by oaks in central coastal California: variation within and among years. Ecology 75:99–109Google Scholar
  17. Maeto K (1993) Acorn insects of Quercus mongolica var. grosseserrata in the Hitsujigaoka natural forest, Hokkaido—life-history of the principal species and their impacts on seed viability. Trans Mtg Hokkaido Br Jpn For Soc 41:88–90Google Scholar
  18. Maeto K (1995) Relationships between size and mortality of Quercus mongolica var. grosseserrata acorns due to pre-dispersal infestation by frugivorous insects. J Jpn For Soc 77:213–219Google Scholar
  19. Manu F, Debouzie D (1993) Coin-flipping plasticity and prolonged diapause in insects: example of the chestnut weevil Curculio elephas (Coleoptera: Curculionidae). Oecologia 93:367–373Google Scholar
  20. Mattson WJ (1971) Relationship between cone crop size and cone damage by insects in red pine seed-production areas. Can Entomol 103:617–621Google Scholar
  21. Morimoto K (1981) On some Japanese Curculioninae (Coleoptera: Curculionidae). Esakia 17:109–130Google Scholar
  22. Papp J, Maeto K (1992) Triaspis curculiovorus sp. n. (Hymenoptera, Braconidae) from Japan, parasitizing acorn weevils. Jpn J Entomol 60:797–804Google Scholar
  23. Shibata M, Tanaka H, Nakashizuka T (1998) Causes and consequences of mast seed production of four co-occurring Carpinus species in Japan. Ecology 79:54–64Google Scholar
  24. Shibata M, Tanaka H, Iida S, Abe S, Masaki T, Niiyama K, Nakashizuka T (2002) Synchronized annual seed production by 16 principal tree species in a temperate deciduous forest, Japan. Ecology 83:1727–1742Google Scholar
  25. Silvertown JW (1980) The evolutionary ecology of mast seeding in trees. Biol J Linn Soc 14:235–250Google Scholar
  26. Sokal RR, Rohlf FJ (1995) Biometry, 3rd edn. Freeman, New YorkGoogle Scholar
  27. Sork VL, Bramble J, Sexton O (1993) Ecology of mast-fruiting in three species of North American deciduous oaks. Ecology 74:528–541Google Scholar
  28. StatSoft (1998) STATISTICA 5.1 for Windows. Tulka, OklaGoogle Scholar
  29. Ueda K (2000) Pre- and post-dispersal damage to the acorns of two oak species (Quercus serrata Thunb. and Q. mongolica Fischer) in a species-rich deciduous forest. J For Res 5:169–174Google Scholar

Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  1. 1.Laboratory of Insect Science, Faculty of AgricultureKobe UniversityKobeJapan
  2. 2.Forestry and Forest Products Research InstituteJapan

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