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| Title: | Dynamical role of predators in population cycles of a forest insect: an experimental test. |
|---|---|
| Author(s): | Turchin, P.; Taylor, A.D.; Reeve, J.D. |
| Date: | 1999 |
| Source: | Science 285: 1068-1071 |
| Station ID: | -- |
| Description: | Population cycles occur frequently in forest insects.Time-series analysis of fluctuations in one such insect, the southern pine beetle (Dendroctonus frontalis), suggests that beetle dynamics are dominated by an ecological process acting in a delayed density-dependent manner.The hypothesis that delayed density-dependence in this insect results from its interaction with predators was tested with a long-term predator-exclusion experiment. Predator-imposed mortality was negligible during the increase phase, grew during the year of peak population, and reached a maximum during the period of population decline.The delayed nature of the impact of predation suggests that predation is an important process that contributes significantly to southern pine beetle oscillations. |
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