Abstract
Ascertaining the relative effects of factors such as weather and predation on population dynamics, and determining the time scales on which they operate, is important to our understanding of basic ecology and pest management. In this study, we sampled the pine engraver Ips pini (Say) (Coleoptera: Scolytidae) and its predominant predators Thanasimus dubius (F.) (Coleoptera: Cleridae) and Platysoma cylindrica (Paykull) (Coleoptera: Histeridae) in red pine plantations in Wisconsin, USA, over 2 years. We sampled both the prey and predators using flight traps baited with the synthetic aggregation pheromone of I. pini. Flight models were constructed using weather variables (temperature and precipitation), counts of bark beetles and their predators, and temporal variables to incorporate possible effects of seasonality. The number of I. pini per weekly collection period was temperature dependent and decreased with the number of predators, specifically T. dubius in 2001 and P. cylindrica in 2002. The number of predators captured each week was also weather dependent. The predators had similar seasonal phenologies, and the number of each predator species was positively correlated with the other. Including a term for the number of prey did not improve the model fits for either predator for either year. Our results suggest that exogenous weather factors strongly affect the flight activity of I. pini, but that its abundance is also affected by direct density-dependent processes acting over weekly time scales. Adult predation during both colonization and dispersal are likely processes yielding these dynamics.
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Acknowledgements
We are grateful to the Wisconsin Department of Natural Resources, J. Lentz, and A. Petrulis for providing study sites. Field assistance by R. Hoffman, G. Richards, S. Eastwood, J. Ludden, and B. Burwitz was greatly appreciated. This study was supported by USDA NRI AMD 96 04317, USDA CSREES 2001-35302-10952, the University of Wisconsin-Madison College of Agricultural and Life Sciences, S.C. Johnson & Son, and an Elsa and Louis Thomsen Wisconsin Distinguished Graduate Fellowship awarded to B.H.A. We thank Nadir Erbilgin, University of California-Berkeley; Allan Carroll, Canadian Forest Service Pacific Forestry Centre; and two anonymous reviewers for their helpful suggestions.
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Aukema, B.H., Clayton, M.K. & Raffa, K.F. Modeling flight activity and population dynamics of the pine engraver, Ips pini, in the Great Lakes region: effects of weather and predators over short time scales. Popul Ecol 47, 61–69 (2005). https://doi.org/10.1007/s10144-004-0202-z
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DOI: https://doi.org/10.1007/s10144-004-0202-z