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DYNAMICAL EFFECTS OF PLANT QUALITY AND PARASITISM ON POPULATION CYCLES OF LARCH BUDMOTH
Author(s) -
Turchin Peter,
Wood Simon N.,
Ellner Stephen P.,
Kendall Bruce E.,
Murdoch William W.,
Fischlin Andreas,
Casas Jêrome,
McCauley Edward,
Briggs Cheryl J.
Publication year - 2003
Publication title -
ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.144
H-Index - 294
eISSN - 1939-9170
pISSN - 0012-9658
DOI - 10.1890/0012-9658(2003)084[1207:deopqa]2.0.co;2
Subject(s) - parasitoid , population cycle , larch , density dependence , parasitism , ecology , population density , population , biology , econometrics , statistics , mathematics , natural enemies , demography , host (biology) , sociology , predation
Population cycles have been remarkably resistant to explanation, in part because crucial experiments are rarely possible on appropriate spatial and temporal scales. Here we show how new approaches to nonlinear time‐series analysis can distinguish between competing hypotheses for population cycles of larch budmoth in the Swiss Alps: delayed effects of budmoth density on food quality, and budmoth–parasitoid interactions. We re‐examined data on budmoth density, plant quality, and parasitism rates. Our results suggest that the effect of plant quality on budmoth density is weak. By contrast, a simple model of budmoth–parasitoid interaction accounts for 90% of the variance in budmoth population growth rates. Thus, contrary to previous studies, we find that parasitoid–budmoth interaction appears to be the dominant factor driving the budmoth cycle. Corresponding Editor: F. R. Adler.