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The role of pocket gophers as subterranean ecosystem engineers

Waves of Larch Budmoth outbreaks in the European Alps

Spatially extended population models predict complex spatiotemporal patterns, such as spiral waves and spatial chaos, as a result of the reaction-diffusion dynamics that arise from trophic interactions. However, examples of such patterns in ecological systems are scarce. We develop a quantitative technique to demonstrate the existence of waves in Central European larch budmoth (Zeiraphera diniana Gn.) outbreaks. We show that these waves travel toward the northeast-east at 210 kilometers per year.

Measuring mast seeding behavior: Relationships among population variation, individual variation and synchrony

Mast seeding, or masting, is the variable production of flowers, seeds, or fruit across years more or less synchronously by individuals within a population. A critical issue is the extent to which temporal variation in seed production over a collection of individuals can be viewed as arising from a combination of individual variation and synchrony among individuals. Studies of masting typically quantify such variation in terms of the coefficient of variation (CV).

Dissecting components of population-level variation in seed production and the evolution of masting behavior

Within-population spatial synchrony in mast seeding of North American oaks

Population dynamics of an exotic forest insect: Gypsy moth in North America

Spatial dynamics of phytophagous insect outbreaks and relationships to mast seeding

Spatial dynamics of forest insect outbreaks

Spatial dynamics of forest insect outbreaks

Spatial synchrony in forest insect populations