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  • Local outbreaks of Operophtera brumata and Operophtera fagata cannot be explained by low vulnerability to pupal predation.

    Author(s) : Heisswolf, A.Käär, M.Klemola, T.Ruohomäki, K.

    Author Affiliation : Section of Ecology, Department of Biology, University of Turku, FI-20014 Turku, Finland.

    Author Email : annette.heisswolf@utu.fi

    Journal article : Agricultural and Forest Entomology 2010 Vol.12 No.1 pp.81-87 ref.many

    Abstract : One of the unresolved questions in studies on population dynamics of forest Lepidoptera is why some populations at times reach outbreak densities, whereas others never do. Resolving this question is especially challenging if populations of the same species in different areas or of closely-related species in the same area are considered. The present study focused on three closely-related geometrid moth species, autumnal Epirrita autumnata, winter Operophtera brumata and northern winter moths Operophtera fagata, in southern Finland. There, winter and northern winter moth populations can reach outbreak densities, whereas autumnal moth densities stay relatively low. We tested the hypothesis that a lower vulnerability to pupal predation may explain the observed differences in population dynamics. The results obtained do not support this hypothesis because pupal predation probabilities were not significantly different between the two genera within or without the Operophtera outbreak area or in years with or without a current Operophtera outbreak. Overall, pupal predation was even higher in winter and northern winter moths than in autumnal moths. Differences in larval predation and parasitism, as well as in the reproductive capacities of the species, might be other candidates.

    ISSN : 1461-9555

    DOI : 10.1111/j.1461-9563.2009.00455.x

    URL : http://www.blackwell-synergy.com/loi/afe

    Record Number : 20103060397

    Publisher : Blackwell Publishing

    Location of publication : Oxford

    Country of publication : UK

    Language of text : English

    Language of summary : English

    Indexing terms for this abstract:

    Organism descriptor(s) : arthropods, Epirrita, Epirrita autumnata, Geometridae, Lepidoptera, Operophtera, Operophtera brumata, Operophtera fagata

    Descriptor(s) : arthropod pests, forests, natural enemies, outbreaks, parasitism, pests, plant pests, population dynamics, predation, pupae

    Identifier(s) : pest arthropods

    Geographical Location(s) : Finland, Nordic Countries

    Broader term(s) : Geometridae, Lepidoptera, insects, Hexapoda, arthropods, invertebrates, animals, eukaryotes, Epirrita, Operophtera, Developed Countries, European Union Countries, Nordic Countries, Northern Europe, Europe, OECD Countries