Ian Pearse, Ph.D.
Ian Pearse is a research ecologist at the Fort Collins Science Center. Ian received a Ph.D. in Entomology from U.C. Davis in 2011. He has conducted research on plant-insect interactions and community ecology, focusing on ways to predict new interactions between introduced species such as plants and herbivorous insects. As part of the invasive species branch, Ian is applying that work to anticipate the impacts of destructive plant and insect invasions.
- Ph.D. University of California, Davis, 2011
- B.S. University of Illinois, 2004
- 2016 Postdoctoral work, University of California, Davis
- 2014-2015 Postdoctoral work, Illinois Natural History Survey
- 2012-2013 Postdoctoral work, Cornell University
Science and Products
This is the dataset used in the BioScience publication of the same name.
Seasonal assembly of arthropod communities on milkweeds experiencing simulated herbivory
The seasonal assembly of arthropod communities is shaped by biotic and abiotic aspects of the habitat that limit the appearance or activity phenology of potential community members. In addition, previous interactions within the community, such as herbivore-induced plant defensive responses, aggregation, and predator avoidance likely affect the...Pearse, Ian S.; McMunn, Marshall; Yang, Louie H.
The relationship between invader abundance and impact
The impacts of invasive species generally increase with their abundance, but the form of invader abundance–impact relationships remain poorly described. We highlight the utility of abundance–impact curves for three questions. First, abundance–impact relationships can clarify whether prevention and management should focus on the species likely to...Sofaer, Helen R.; Jarnevich, Catherine S.; Pearse, Ian S.
Entrapped carrion increases indirect plant resistance and intra‐guild predation on a sticky tarweed
Many plants employ indirect defenses against herbivores; often plants provide a shelter or nutritional resource to predators, increasing predator abundance, and lessening herbivory to the plant. Often, predators on the same plant represent different life stages and different species. In these situations intraguild predation (IGP) may occur and may...LoPresti, Eric; Krimmel, Billy; Pearse, Ian S.
Variation in plant defense suppresses herbivore performance
Defensive variability of crops and natural systems can alter herbivore communities and reduce herbivory. However, it is still unknown how defense variability translates into herbivore suppression. Nonlinear averaging and constraints in physiological tracking (also more generally called time-dependent effects) are the two mechanisms by which...Pearse, Ian S.; Paul, Ryan; Ode, Paul J.
Long-term trends in midwestern milkweed abundances and their relevance to monarch butterfly declines
Declines in monarch butterfly populations have prompted investigation into the sensitivity of their milkweed host plants to land-use change. Documented declines in milkweed abundance in croplands have spurred efforts to promote milkweeds in other habitats. Nevertheless, our current understanding of milkweed populations is poor. We used a long-term...Zaya, David N.; Pearse, Ian S.; Spyreas, Gregory