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
Predicting the phenology of invasive grasses under a changing climate to inform mapping and management
Predicting risk of annual grass invasion following fire in sagebrush steppe and rangeland ecosystems
INHABIT: A web-based decision support tool for invasive plant species habitat visualization and assessment across the contiguous United States
Developing a macroecological understanding of invasive plant impacts based on abundance and trait data
Population genetic analysis of the rusty patched bumble bee in extant locations in 2022
Potential distribution of Japanese brome (Bromus japonicus) across the contiguous United States (October 2023)
Management summary table for INHABIT species potential distribution across the contiguous United States: additional management units
Thresholded abundance models for three invasive plant species in the United States
INHABIT species potential distribution across the contiguous United States (ver. 3.0, February 2023)
Data on how Lepidium draba responds to damage of clones
Data on grasshopper composition in the Thunder Basin National Grassland, Wyoming, USA
Data for a lab study of the effects of diet variability on the interactions between a Lepidopteran herbivore and its parasitoid
Greenhouse observations of plant herbivore interactions on Lepidium draba to test effects of ontogenic variability
Californian crop pests, pesticide applications, and phylogenetic information of crops
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
Predictor importance in habitat suitability models for invasive terrestrial plants
Range-wide genetic analysis of an endangered bumble bee (Bombus affinis, Hymenoptera: Apidae) reveals population structure, isolation by distance, and low colony abundance
The evolution of glandularity as a defense against herbivores in the tarweed clade
Non-native plant invasion after fire in western USA varies by functional type and with climate
Hurricanes: An unexpected mechanism linking disturbance and seed production in trees
Plant size, latitude, and phylogeny explain within-population variability in herbivory
Macroscale analyses suggest invasive plant impacts depend more on the composition of invading plants than on environmental context
Modeling habitat suitability across different levels of invasive plant abundance
Increased aridity is associated with stronger tradeoffs in ponderosa pine vital functions
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
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
Predicting the phenology of invasive grasses under a changing climate to inform mapping and management
Predicting risk of annual grass invasion following fire in sagebrush steppe and rangeland ecosystems
INHABIT: A web-based decision support tool for invasive plant species habitat visualization and assessment across the contiguous United States
Developing a macroecological understanding of invasive plant impacts based on abundance and trait data
Population genetic analysis of the rusty patched bumble bee in extant locations in 2022
Potential distribution of Japanese brome (Bromus japonicus) across the contiguous United States (October 2023)
Management summary table for INHABIT species potential distribution across the contiguous United States: additional management units
Thresholded abundance models for three invasive plant species in the United States
INHABIT species potential distribution across the contiguous United States (ver. 3.0, February 2023)
Data on how Lepidium draba responds to damage of clones
Data on grasshopper composition in the Thunder Basin National Grassland, Wyoming, USA
Data for a lab study of the effects of diet variability on the interactions between a Lepidopteran herbivore and its parasitoid
Greenhouse observations of plant herbivore interactions on Lepidium draba to test effects of ontogenic variability
Californian crop pests, pesticide applications, and phylogenetic information of crops
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
Predictor importance in habitat suitability models for invasive terrestrial plants
Range-wide genetic analysis of an endangered bumble bee (Bombus affinis, Hymenoptera: Apidae) reveals population structure, isolation by distance, and low colony abundance
The evolution of glandularity as a defense against herbivores in the tarweed clade
Non-native plant invasion after fire in western USA varies by functional type and with climate
Hurricanes: An unexpected mechanism linking disturbance and seed production in trees
Plant size, latitude, and phylogeny explain within-population variability in herbivory
Macroscale analyses suggest invasive plant impacts depend more on the composition of invading plants than on environmental context
Modeling habitat suitability across different levels of invasive plant abundance
Increased aridity is associated with stronger tradeoffs in ponderosa pine vital functions
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
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