Ian Pearse, PhD
Ian is an ecologist who works on plants and insects.
Ian conducts research at the individual, population, community, and ecosystem level scales. His work focuses on plant-insect interactions and involves work on endangered insects such as bumble bees, strategies to map and control invasive plants, the chemical ecology and behaviors that affect herbivory, and the boom and bust seed production dynamics of many trees (i.e. mast seeding). His work informs management decisions made by the US Fish and Wildlife Service, National Parks, and a variety of other groups. Ian is especially fond of oak trees and spends a considerable amount of time staring up into them with the vague excuse of counting acorns, gall wasps, or rates of herbivory.
Professional Experience
2016 Postdoctoral work, University of California, Davis
2014-2015 Postdoctoral work, Illinois Natural History Survey
2012-2013 Postdoctoral work, Cornell University
Education and Certifications
PhD Entomology, University of California, Davis, 2011
BS Plant Biology, University of Illinois, Urbana-Champaign 2004
Affiliations and Memberships*
International Oak Society
Ecological Society of America
Entomological Society of America
Science and Products
Data on the impacts of garlic mustard from a weeding experiment in Pennsylvania 2006-2016
Data on prairie dogs, plants, arthropod biomass, and birds for Thunder Basin, Wyoming in 2017
Data on interannual seed set variation, weather, and reproductive traits for global plants
Data on cone production in pinyon pine in the Southwestern USA from 2003-2016
Data on gall wasp abundance and biomass on valley oak and blue oak trees in California
Long term cone production of white spruce throughout boreal forests in North America
Data on interannual variability of seed production, nutrient, and weather for 219 plant species
Croton setiger predators, herbivores, and damage collected in California 2013-2014
Measurements of plant abundance with reference to dominant plants in Illinois wetlands
Measurements of milkweeds and associated arthropods at Hastings Preserve, California in 2013
Intraguild predation dataset for arthropods on tarweed plants
Laboratory Data on Cabbage Looper Moth Response to Xanthotoxin, 2018
Invasion-mediated mutualism disruption is evident across heterogeneous environmental conditions and varying invasion intensities
Periodical cicada emergences affect masting behavior of oaks
Extensive regional variation in the phenology of insects and their response to temperature across North America
Combining local, landscape, and regional geographies to assess plant community vulnerability to invasion impact
Masting is shaped by tree-level attributes and stand structure, more than climate, in a Rocky Mountain conifer species
Invaders at the doorstep: Using species distribution modeling to enhance invasive plant watch lists
SPCIS: Standardized Plant Community with Introduced Status database
Addressing detection uncertainty in Bombus affinis (Hymenoptera: Apidae) surveys can improve inferences made from monitoring
Grasshopper species composition differs between prairie dog colonies and undisturbed sites in a sagebrush grassland
Root hemiparasitic plants are associated with more even communities across North America
Herbivory changes biomass allocation but does not induce resistance among clones of an invasive plant
Fitness homeostasis across an experimental water gradient predicts species' geographic range and climatic breadth
Non-USGS Publications**
http://onlinelibrary.wiley.com/doi/10.1111/nph.14114/full
http://onlinelibrary.wiley.com/doi/10.1111/1365-2745.12554/pdf
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0152537
http://onlinelibrary.wiley.com/doi/10.1890/14-0297.1/ful
http://onlinelibrary.wiley.com/doi/10.1890/15-0342.1/full
http://link.springer.com/article/10.1007/s10531-010-9956-0
http://www.pnas.org/content/106/43/18097.short
http://onlinelibrary.wiley.com/doi/10.1111/j.1365-3040.2005.01307.x/full
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
Science and Products
Data on the impacts of garlic mustard from a weeding experiment in Pennsylvania 2006-2016
Data on prairie dogs, plants, arthropod biomass, and birds for Thunder Basin, Wyoming in 2017
Data on interannual seed set variation, weather, and reproductive traits for global plants
Data on cone production in pinyon pine in the Southwestern USA from 2003-2016
Data on gall wasp abundance and biomass on valley oak and blue oak trees in California
Long term cone production of white spruce throughout boreal forests in North America
Data on interannual variability of seed production, nutrient, and weather for 219 plant species
Croton setiger predators, herbivores, and damage collected in California 2013-2014
Measurements of plant abundance with reference to dominant plants in Illinois wetlands
Measurements of milkweeds and associated arthropods at Hastings Preserve, California in 2013
Intraguild predation dataset for arthropods on tarweed plants
Laboratory Data on Cabbage Looper Moth Response to Xanthotoxin, 2018
Invasion-mediated mutualism disruption is evident across heterogeneous environmental conditions and varying invasion intensities
Periodical cicada emergences affect masting behavior of oaks
Extensive regional variation in the phenology of insects and their response to temperature across North America
Combining local, landscape, and regional geographies to assess plant community vulnerability to invasion impact
Masting is shaped by tree-level attributes and stand structure, more than climate, in a Rocky Mountain conifer species
Invaders at the doorstep: Using species distribution modeling to enhance invasive plant watch lists
SPCIS: Standardized Plant Community with Introduced Status database
Addressing detection uncertainty in Bombus affinis (Hymenoptera: Apidae) surveys can improve inferences made from monitoring
Grasshopper species composition differs between prairie dog colonies and undisturbed sites in a sagebrush grassland
Root hemiparasitic plants are associated with more even communities across North America
Herbivory changes biomass allocation but does not induce resistance among clones of an invasive plant
Fitness homeostasis across an experimental water gradient predicts species' geographic range and climatic breadth
Non-USGS Publications**
http://onlinelibrary.wiley.com/doi/10.1111/nph.14114/full
http://onlinelibrary.wiley.com/doi/10.1111/1365-2745.12554/pdf
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0152537
http://onlinelibrary.wiley.com/doi/10.1890/14-0297.1/ful
http://onlinelibrary.wiley.com/doi/10.1890/15-0342.1/full
http://link.springer.com/article/10.1007/s10531-010-9956-0
http://www.pnas.org/content/106/43/18097.short
http://onlinelibrary.wiley.com/doi/10.1111/j.1365-3040.2005.01307.x/full
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government