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
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
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
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.
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
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
Data on interannual seed set variation, weather, and reproductive traits for global plants
Science and Products
- Publications
Filter Total Items: 57
Plant size, latitude, and phylogeny explain within-population variability in herbivory
Interactions between plants and herbivores are central in most ecosystems, but their strength is highly variable. The amount of variability within a system is thought to influence most aspects of plant-herbivore biology, from ecological stability to plant defense evolution. Our understanding of what influences variability, however, is limited by sparse data. We collected standardized surveys of heAuthorsMoria Robinson, Karen C Abbott, Warwick J. Allen, Janete Andrade, Diego Angulo, Diego Anjos, Daniel Anstett, Robert Bagchi, Sumanta Bagchi, Milton Barbosa, Sarah Barrett, Carina Baskett, Eyal Ben-Simchon, Kathryn Bloodworth, Judith L. Bronstein, Emilio Bruna, Yvonne Buckley, Karin Burghardt, Carlos Bustos-Segura, N. Ivalú Cacho, Eduardo Soares Calixto, Raquel Carvalho, Bastien Castagneyrol, Mariana Chiuffo, Damla Cinoğlu, Elizeth Cinto Mejia, Marina Cock, Rodrigo Cogni, Olivia Cope, Tatiana Cornelissen, Dezirea Cortez, David Crowder, Caroline Dallstream, Wesley Dáttilo, Julien Davis, Romina Dimarco, Haley Dole, Lee Dyer, Ikponmwosa Egbon, Afure Ejomah, Bret D Elderd, María-José Endara, Micky D. Eubanks, Susan Everingham, Keiko Farah, Rafael de Paiva Farias, Geraldo Fernandes, Marco Ferrante, Alain Finn, Grace Florjancic, Matthew L. Forister, Quinn Fox, Enric Frago, Filipe M. França, Abigail Getman-Pickering, Zoe Getman-Pickering, Ben Gooden, Martin M. Gossner, Keri Greig, Sofia Gripenberg, Ronny Groenteman, Patrick Grof-Tisza, Nora Haack, Lisa Hahn, Philip Hahn, Shiekh Marifatul Haq, Justus Hennecke, Sara Hermann, Liza M. Holeski, Matthew Hutchinson, Brian Inouye, Eleanor Jackson, Shinnosuke Kagiya, Michael Kalwajtys, Richard Karban, Rupesh Kariyat, Tamar Keasar, Monica Kersch-Becker, Heather Kharouba, Tania Kim, Duncan Kimuyu, Jennifer Kluse, Sally E. Koerner, Kimberly Komatsu, Sushmita Krishnan, Miika Laihonen, Lucas Lamelas-López, Michael LaScaleia, Nicolas Lecomte, Carlos Lehn, Xiaofei Li, Richard L Lindroth, Eric LoPresti, María Losada, Allison M Louthan, Victoria Luizzi, Joshua Lynn, Nicholas Lyon, Laís Maia, Renata Maia, Tosca Mannall, Bruce Martin, Tara Massad, Andrew McCall, Kelsey McGurrin, Andrew Merwin, Zarluis Mijango-Ramos, Charlotte Mills, Angela Moles, Christopher Moore, Colin Morrison, Moleseng Moshobane, Anne Muola, Ryosuke Nakadai, Kazuhide Nakajima, Samuel Novais, Charlee Ogbebor, Haruna Ohsaki, Vincent Pan, Nicholas Pardikes, Narayanaswamy Parthasarathy, Rohit Pawar, Quentin Paynter, Ian Pearse, Rachel Penczykowski, Adam Pepi, Cássio Pereira, Shyam Phartyal, Frida I. Piper, Katja Poveda, Elizabeth Pringle, Javier Puy, Teresa Quijano, Carolina Quintero, Sergio Rasmann, Christoph Rosche, Leah Rosenheim, Justin B. Runyon, Asaf Sadeh, Yuzu Sakata, Danielle Salcido, Cristian Salgado-Luarte, Bráulio Santos, Yuval Sapir, Yamila Sasal, Yasuhiro Sato, Manasi Sawant, Hayley Schroeder, Isabell Schumann, Michal Segoli, Hila Segre, Oren Shelef, Naoto Shinohara, Rachit Pratap Singh, David Smith, Mar Sobral, Gisela Stotz, Ayco Tack, Mandeep Tayal, John Tooker, Daniel Torrico-Bazoberry, Kévin Tougeron, Nora Underwood, Shunsuke Utsumi, Osariyekemwen Uyi, Jessica Vaca-Uribe, Anu Valtonen, Laura van Dijk, Vigdis Vandvik, Jesus Villellas, Lauren Waller, Marjorie G. Weber, William C. Wetzel, Susan Whitehead, Akira Yamawo, Samantha Yim, Luke Zehr, Zhiwei ZhongMacroscale analyses suggest invasive plant impacts depend more on the composition of invading plants than on environmental context
AimNative biodiversity is threatened by the spread of non-native invasive species. Many studies demonstrate that invasions reduce local biodiversity but we lack an understanding of how impacts vary across environments at the macroscale. Using ~11,500 vegetation surveys from ecosystems across the United States, we quantified how the relationship between non-native plant cover and native plant diverAuthorsEvelyn M. Beaury, Helen Sofaer, Regan Early, Ian Pearse, Dana M. Blumenthal, Jeffrey Corbin, Jeffrey M. Diez, Jeffrey Dukes, David Barnett, Ines Ibanez, Laís Petri, Montserrat Vilà, Bethany A. BradleyModeling habitat suitability across different levels of invasive plant abundance
Predicting where invasive plants are likely to spread and become abundant is critical for informing invasive plant management. Species distribution models are a key tool for informing the geography of invasion risk, but most distribution models are limited by their use of presence data, including no information on invader population abundance. In this study, we ask how habitat suitability varies fAuthorsEvelyn M. Beaury, Catherine S. Jarnevich, Ian Pearse, Annette E. Evans, Nathan Teich, Peder Engelstad, Jillian LaRoe, Bethany A. BradleyIncreased aridity is associated with stronger tradeoffs in ponderosa pine vital functions
Trees must allocate resources to core functions like growth, defense, and reproduction. These allocation patterns have profound effects on forest health, yet little is known about how core functions trade off over time, and even less is known about how a changing climate will impact tradeoffs. We conducted a 21-year survey of growth, defense, and reproduction in 80 ponderosa pine individuals spannAuthorsAngela Gonzalez, Ian Pearse, Miranda RedmondInvasion-mediated mutualism disruption is evident across heterogeneous environmental conditions and varying invasion intensities
The impact of a biological invasion on native communities is expected to be uneven across invaded landscapes due to differences in local abiotic conditions, invader abundance, and traits and composition of the native community. One way to improve predictive ability about the impact of an invasive species given variable conditions is to exploit known mechanisms driving invasive species' success. InAuthorsMorgan Roche, Ian Pearse, Helen Sofaer, Stephanie N Kivlin, Greg Spyreas, David N. Zaya, Susan KaliszPeriodical cicada emergences affect masting behavior of oaks
Oaks (Quercus spp.) are masting species exhibiting highly variable and synchronized acorn production. We investigated the hypothesis that periodical cicadas (Magicada spp.), well known to have strong effects on the ecosystems in which they occur, affect acorn production of oaks through their xylem feeding habits as nymphs, the oviposition damage they inflict as adults during emergences, or the nutAuthorsWalter D. Koenig, Andrew Leibhold, Jalene LaMontagne, Ian PearseExtensive regional variation in the phenology of insects and their response to temperature across North America
Climate change models often assume similar responses to temperatures across the range of a species, but local adaptation or phenotypic plasticity can lead plants and animals to respond differently to temperature in different parts of their range. To date, there have been few tests of this assumption at the scale of continents, so it is unclear if this is a large-scale problem. Here, we examined thAuthorsPeter Dunn, Insiyaa Ahmed, Elise Armstrong, Natasha Barlow, Malcolm Barnard, Marc Belisle, T.J. Benson, Lisha Berzins, Chloe Boynton, T. Anders Brown, Melissa Cady, Kyle Cameron, Xuan Chen, Bob Clark, Ethan Clotfelter, Kara Cromwell, Russ Dawson, Elsie Denton, Andrew Forbes, Kendrick Fowler, Kamal J.K. Gandhi, Dany Garant, Megan Hiebert, Claire Houchen, Jennifer Houtz, Tara Imlay, Brian Inouye, David Inouye, Michelle Jackson, Andrew Jacobson, Kristen Jayd, Christy Juteau, Andrea Kautz, Caroline Killian, Kimberly J Komatsu, Kirk Larsen, Andrew Laughlin, Valerie Levesque-Beaudin, Ryan Leys, Elizabeth Long, Stephen Lougheed, Stu Mackenzie, Jen Marangelo, Colleen Miller, Brenda Molano-Flores, Christy Morrissey, Emony Nicholls, Jessica Orlofske, Ian Pearse, Kristen Peck, Fanie Pelletier, Amber Pitt, Joe Poston, Danielle Racke, Jeannie A. Randall, Matthew Richardson, Olivia Rooney, A. Rose Ruegg, Scott Rush, Sadie Ryan, Mitchell Sadowski, Ivana Schoepf, Lindsay Schulz, Brenna Shea, Tom Sheehan, Lynn Siefferman, Derek Sikes, Mark Stanback, Jennifer Styrsky, John Styrsky, Conor Taff, Jennifer Uehling, Kit Uvino, Thomas Wassmer, Katie Weglarz, Megan Weinberger, John Wenzel, Linda A WhittinghamCombining local, landscape, and regional geographies to assess plant community vulnerability to invasion impact
Invasive species science has focused heavily on the invasive agent. However, management to protect native species also requires a proactive approach focused on resident communities and the features affecting their vulnerability to invasion impacts. Vulnerability is likely the result of factors acting across spatial scales, from local to regional, and it is the combined effects of these factors thaAuthorsInes Ibáñez, Lais Petri, David Barnett, Evelyn M. Beaury, Dana M. Blumenthal, Jeff Corbin, Jeffrey M. Diez, Jeffrey Dukes, Reagan Early, Ian Pearse, Cascade J. B. Sorte, Montserrat Vila, Bethany A. BradleyMasting is shaped by tree-level attributes and stand structure, more than climate, in a Rocky Mountain conifer species
Masting describes the spatiotemporal variability in seed production by a population of plants. Both abiotic and biotic factors drive masting, but the importance of these factors can vary among individuals and populations. To better understand how a changing climate, altered disturbance regimes, or novel management strategies might affect future seed production, we quantified the joint influence ofAuthorsAndreas Wion, Ian Pearse, Kyle C. Rodman, Thomas T. Veblen, Miranda RedmondInvaders at the doorstep: Using species distribution modeling to enhance invasive plant watch lists
Watch lists of invasive species that threaten a particular land management unit are useful tools because they can draw attention to invasive species at the very early stages of invasion when early detection and rapid response efforts are often most successful. However, watch lists typically rely on the subjective selection of invasive species by experts or on the use of spotty occurrence records.AuthorsCatherine S. Jarnevich, Peder Engelstad, Jillian LaRoe, Brandon Hays, Terri Hogan, Jeremy Jirak, Ian Pearse, Janet S. Prevéy, Jennifer Sieraki, Annie Simpson, Jess Wenick, Nicholas Young, Helen SofaerSPCIS: Standardized Plant Community with Introduced Status database
The movement of plant species across the globe exposes native communities to new species introductions. While introductions are pervasive, two aspects of variability underlie patterns and processes of biological invasions at macroecological scales. First, only a portion of introduced species become invaders capable of substantially impacting ecosystems. Second, species that do become invasive at oAuthorsLais Petri, Evelyn M. Beaury, Jeff Corbin, Kristen Peach, Helen Sofaer, Ian Pearse, Reagan Early, Dave Barnett, Inés Ibáñez, Robert K. Peet, Michael Schafale, Thomas Wentworth, James Vanderhorst, David N. Zaya, Greg Spyreas, Bethany A. BradleyAddressing detection uncertainty in Bombus affinis (Hymenoptera: Apidae) surveys can improve inferences made from monitoring
The U.S. Fish and Wildlife Service developed national guidelines to track species recovery of the endangered rusty patched bumble bee [Bombus affinis Cresson (Hymenoptera: Apidae)] and to investigate changes in species occupancy across space and time. As with other native bee monitoring efforts, managers have specifically acknowledged the need to address species detection uncertainty and determineAuthorsClint R.V. Otto, Alma Schrage, Larissa L. Bailey, John Michael Mola, Tamara A. Smith, Ian Pearse, Stacy C. Simanonok, Ralph GrundelNon-USGS Publications**
Pearse, I.S., Koenig, W.D., Kelly, D. 2016. Mechanisms of mast seeding: resources, weather, cues, and selection. The New Phytologist 212: 546-562
http://onlinelibrary.wiley.com/doi/10.1111/nph.14114/fullMescher, M.C. and Pearse, I.S. 2016. Communicative interactions involving plants: information, evolution, and ecology Current Opinion in Plant Biology 32: 69-76. http://www.sciencedirect.com/science/article/pii/S136952661630098XKrimmel, B.A., Pearse, I.S. 2016. Tolerance and phenological avoidance of herbivory in tarweed species. Ecology 97: 1357-1363. http://onlinelibrary.wiley.com/doi/10.1890/15-1454.1/fullPesendorfer, M., Koenig, W.D., Pearse, I.S., Knops, J.M.H., Funk, K. 2016. Individual resource limitation combined with population-wide pollen availability drives masting in the valley oak (Quercus lobata). Journal of Ecology 104: 637-645.
http://onlinelibrary.wiley.com/doi/10.1111/1365-2745.12554/pdfMoriera, X., Sampedro, L., Zas, R., Pearse, I.S. 2016. Defensive Traits in Young Pine Trees Cluster into Two Divergent Syndromes Related to Early Growth Rate. PlosOne. 0152537.
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0152537Koenig, W.D., Alejano, R., Dolores Carbonero, M., Fernández-Rebollo, P., Knops, J.M.H, Maranon, T., Padilla-Diaz, C.M., Pearse, I.S., Perez-Ramon, I.M., Pesendorfer, M.B. 2016. Is the relationship between mast‐seeding and weather in oaks related to their life‐history or phylogeny? Ecology 97: 2603-2615. http://onlinelibrary.wiley.com/doi/10.1002/ecy.1490/fullYguel, B., Jactel, H., Pearse, I.S., Moen, D., Winter, M., Hortal, J., Helmus, M., Kühn, I., Pavoine, S., Purschke, O., Weiher, E., Violle, C., Ozinga, W., Braendle M., Bartish I., Prinzing, A. 2016. The Evolutionary Legacy of Diversification Predicts Ecosystem Function. The American Naturalist. http://www.journals.uchicago.edu/doi/abs/10.1086/687964Pearse, I.S., Koenig, W.D., Funk, K.A., Presendorfer, M.B. 2015. Pollen limitation and flower abortion in a wind-pollinated, masting tree. Ecology 96: 587-593
http://onlinelibrary.wiley.com/doi/10.1890/14-0297.1/fulKoenig, W.D., Knops, J.M.H., Carmen, W.J., Pearse, I.S. 2015. What drives masting? The phenological synchrony hypothesis. Ecology 96: 184-192. http://onlinelibrary.wiley.com/doi/10.1890/14-0819.1/fullMcMahon, D., Pearse, I.S., Koenig, W.D., Walters, E.L. 2015. Oak community shift and woodpecker population increase over three decades in California woodland. Canadian Journal of Forest Research. http://www.nrcresearchpress.com/doi/abs/10.1139/cjfr-2015-0035#.V__Zq_krJ9MLoPresti, E.F., Pearse, I.S., Charles, G.K. 2015. A plant siren song: columbines provision mutualist arthropods by attracting and killing passerby insects. Ecology (featured in Science and Discover Magazine)
http://onlinelibrary.wiley.com/doi/10.1890/15-0342.1/fullPearse, I.S., Altermatt, F. 2015. Out of sample predictions from plant-insect food webs: robustness to missing and erroneous trophic interaction records. Ecological Applications. http://onlinelibrary.wiley.com/doi/10.1890/14-1463.1/fullPearse, I.S., Baty, J.H., Herrmann, D.L., Sage, R., Koenig, W.D. 2015. Leaf phenology mediates provenance differences in herbivore populations on valley oaks in a common garden. Ecological Entomology. http://onlinelibrary.wiley.com/doi/10.1111/een.12219/full
Hughes, K.A., Pearse, I.S., Gof-Tizsa, P., Karban, R. 2015. Individual-level differences in generalist caterpillar responses to a plant-plant signal. Ecological Entomology. http://onlinelibrary.wiley.com/doi/10.1111/een.12224/fullPearse, I.S., Funk, K.A., Kraft, T.S., Koenig, W.D. 2015. Lagged effects of early‑season herbivores on valley oak fecundity. Oecologia 178: 361-368. http://link.springer.com/article/10.1007/s00442-014-3193-2
Petchey, O.L., Pontarp, M., Massie, T.N., Kéfi, S., Ozgul, A., Weilenmann, M., Palamara, G.C., Altermatt, F., Matthews, B.J., Levine, J.M., Childs, D.Z., McGill, B.J., Schaepman, M.E., Schmid, B., Spaak, P., Beckerman, A.P., Pennekamp, F., Pearse, I.S. 2015. The Ecological Forecast Horizon, and examples of its uses and determinants. Ecology Letters. http://onlinelibrary.wiley.com/doi/10.1111/ele.12443/fullPearse, I.S., Hipp, A.L. 2014. Native plant diversity increases herbivory to non-natives. Proceedings of the Royal Society – B 281: 20141841. http://rspb.royalsocietypublishing.org/content/281/1794/20141841.shortDesurmont, G., Pearse, I.S. Alien plants versus alien herbivores: does it matter who is non-native in a novel trophic interaction? Current Opinion in Insect Science 2: 20-25. http://www.sciencedirect.com/science/article/pii/S221457451400035Krimmel, B.A., Pearse, I.S. 2014. Generalist and sticky plant specialist predators suppress herbivores on a sticky plant. Arthropod Plant Interactions 8: 403-410. http://link.springer.com/article/10.1007/s11829-014-9318-zPearse, I.S., Cobb, R.C., Karban, R. 2014. The phenology substrate match hypothesis explains decomposition rates of evergreen and deciduous oak leaves. Journal of Ecology 102: 28-35. http://onlinelibrary.wiley.com/doi/10.1111/1365-2745.12182/fullKoenig, W.D., Walters, E.L., Pearse, I.S., Knops, J.M.H. 2014. Serotiny in California oaks. Madroño 61(2): 151-158. http://www.bioone.org/doi/full/10.3120/0024-9637-61.2.151
Pearse, IS, Koenig, WD, Knops, JMH. 2014. Cues versus proximate drivers: testing the mechanism behind masting behavior. Oikos 123: 179-184 http://onlinelibrary.wiley.com/doi/10.1111/j.1600-0706.2013.00608.x/fullKarban, R., Huntzinger, M., Pearse, I.S. 2014. How to Do Ecology: A Concise Handbook, 2nd edition. Princeton University Press, Princeton. http://press.princeton.edu/titles/10284.htmlPearse, I.S., Bastow, J.L., Tsang, A. 2014. Radish introduction affects soil biota but has a positive impact on the growth of a native plant. Oecologia 174: 471-478. http://link.springer.com/article/10.1007/s00442-013-2779-4Pearse, I.S., Griswold, S., Pizarro, D., Koenig, W.D. 2014. Stage and size structure of three species of oaks in central coastal California. Madroño 61(1): 1-8. http://www.bioone.org/doi/abs/10.3120/0024-9637-61.1.1
Pearse, I.S., Gee, W.S., Beck, J.J. 2013. Headspace volatiles from 52 oak species advertise induction, species identity, and evolution, but not defense. Journal of Chemical Ecology 39: 90-100. http://link.springer.com/article/10.1007/s10886-012-0224-5Pearse, I.S. and Altermatt, F. 2013. Extinction cascades partially estimate observed herbivore losses in a Lepidoptera-plant food web. Ecology 94(8): 1785-1794 (Cover article). http://onlinelibrary.wiley.com/doi/10.1890/12-1075.1/fullPearse, I.S., Hughes, K., Shiojiri, K., Ishizaki, S., Karban, R. 2013. Interplant volatile signaling in willows: revisiting the original talking trees. Oecologia 172: 869-875 (Cover article). http://link.springer.com/article/10.1007/s00442-013-2610-2Pearse, I.S. and Karban, R. 2013. Leaf drop affects herbivory in oaks. Oecologia 173: 925-932. http://link.springer.com/article/10.1007/s00442-013-2689-5
Pearse, I.S., Harris, D.J., Karban, R., Sih, A. 2013.Predicting novel herbivore-plant interactions. Oikos 122: 1554-1564. http://onlinelibrary.wiley.com/doi/10.1111/j.1600-0706.2013.00527.x/fullPearse, I.S. and Altermatt F. 2013. Predicting novel trophic interactions in a non-native world. Ecology Letters 16: 1088-1094. http://onlinelibrary.wiley.com/doi/10.1111/ele.12143/fullKrimmel, B.A. and Pearse, I.S. 2013. Sticky plants trap invertebrate carrion to enhance indirect defense. Ecology Letters. 16: 219-224 (featured in Nature). http://onlinelibrary.wiley.com/doi/10.1111/ele.12032/fullSavchenko, T., Pearse, I.S., Karban, R., DeHesh, K. 2013. Insect feeding habits determine the composition of hydroperoxide lyase-derived metabolites. The Plant Journal 73: 653-662. http://onlinelibrary.wiley.com/doi/10.1111/tpj.12064/full
Pearse, I.S., Karban, R. 2013. Do plant-plant signals mediate herbivory consistently in multiple taxa and ecological contexts? Journal of Plant Interactions 8(3): 203-206. http://www.tandfonline.com/doi/abs/10.1080/17429145.2013.765511Pearse, I.S. and Hipp, A.L. 2012. Global patterns of leaf defenses in oak species. Evolution. 66(7): 2272-2286. http://onlinelibrary.wiley.com/doi/10.1111/j.1558-5646.2012.01591.x/full
Herrmann, D.L., Pearse, I.S., Baty, J.H. 2012. Drivers of specialist herbivore diversity across 10 cities. Landscape and Urban Planning 108: 123-130. http://www.sciencedirect.com/science/article/pii/S0169204612002617Pearse, I.S., Parensky, L.M., Yang, L.H., Stanton, M.L., Karban, R., Bhattacharyya, L., Dove, K., Higgins, A., Kamaroff, C., Kirk, T., Knight, C., Koch, R., Rollins, H., Tanner, K., Cox, R. 2012. Complex consequences of herbivory and interplant cues in three annual plants. PlosOne 7(5): e38105. http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0038105Pearse, I.S. and Baty, J.H. 2012. The predictability of traits and ecological interactions on 17 different crosses of hybrid oaks. Oecologia 169: 489-497. http://link.springer.com/article/10.1007/s00442-011-2216-5
Pearse, I.S. 2012. The role of leaf defensive traits in oaks on the preference and performance of a polyphagous herbivore, Orgyia vetusta. Ecological Entomology 36(5): 635-642. http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2311.2011.01308.x/fullAltermatt, F., Pearse, I.S. 2011. Similarity and specialization of the larval versus adult diets of European butterflies and moths. The American Naturalist 178(3): 372-378. http://www.jstor.org/stable/10.1086/661248?seq=1#page_scan_tab_contentsJoseph, M., Gentles, M., Pearse, I.S. 2011. The parasitoid community of Andricus quercuscalifornicus (Hymenoptera: Cynipidae) is associated with gall size and host phenology. Biodiversity and Conservation 20: 203-216.
http://link.springer.com/article/10.1007/s10531-010-9956-0Pearse I.S. 2011. Novel herbivore-plant interactions: Evidence from non-native oaks (Dissertation) U. California – Davis. http://gradworks.umi.com/34/99/3499479.html
Pearse, I.S. 2010. Bird rookeries have different effects on different feeding guilds of herbivores and alter the feeding behavior of a common caterpillar. Arthropod Plant Interactions 4: 189-195. http://link.springer.com/article/10.1007/s11829-010-9098-zKarban, R., C. Karban, Huntzinger, M., Pearse, I., Crutsinger, G. 2010. Diet mixing enhances the performance of a generalist caterpillar, Platyprepia virginalis. Ecological Entomology 35(1): 92-99. http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2311.2009.01162.x/fullPearse, I.S. and A.L. Hipp. 2009. Phylogenetic and trait similarity to a native species predict herbivory on non-native oaks. Proceedings of the National Academy of Sciences of the United States of America 106(43): 18097-18102. (Cover article)
http://www.pnas.org/content/106/43/18097.short
Pearse, I, Zhu, Y, Murray, E, Dudeja, P, Ramaswamy, K, Malakooti, J. 2007. Sp1 and Sp3 control constitutive expression of the human NHE2 promoter by interactions with the proximal promoter and the transcription initiation site. Biochemical Journal 407: 101-111. http://www.biochemj.org/content/407/1/101.abstract
Pearse, IS, Krügel, T, Baldwin, IS. 2006. Innovation in anti-herbivore defense systems during neopolyploidy - the functional consequences of instantaneous speciation. The Plant Journal 47: 196-210. http://onlinelibrary.wiley.com/doi/10.1111/j.1365-313X.2006.02776.x/fullPearse, I.S., Heath, K.D., Cheeseman, J.M. 2006. Biochemical and ecological characterization of two peroxidase isoenzymes from the mangrove, Rhizophora mangle. Plant, Cell and Environment 28: 612-622 (Cover article).
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
Predicting the phenology of invasive grasses under a changing climate to inform mapping and management
Cheatgrass, an invasive annual grass, reduces ecosystem productivity, negatively impacts biodiversity, and is increasingly problematic in higher elevation ecosystems with climate change. Cheatgrass phenology (that is, the timing of yearly growth and lifespan) varies greatly with elevation, climate, and weather from year to year, which can make management planning difficult and reduce the ability...Predicting risk of annual grass invasion following fire in sagebrush steppe and rangeland ecosystems
This project analyzes on-the-ground plant monitoring data across sagebrush and rangeland ecosystems to examine how fire, climate, topography, and plant communities influence the success of invasive annual grasses after fires.INHABIT: A web-based decision support tool for invasive plant species habitat visualization and assessment across the contiguous United States
Many managers are hampered by the scope of the invasive species problem compared to their available resources. Habitat suitability models of invaders can help fill this resource gap, helping with activities such as watch list compilation and targeted surveillance and eradication efforts.Developing a macroecological understanding of invasive plant impacts based on abundance and trait data
Understanding invasive plant impacts can provide insight into community assembly and inform the development of successful management strategies. The impacts of invasive species depend on how they alter patterns of abundance within recipient communities and on the characteristics of the invaders and the affected species. Research has suggested that common species may be more impacted by invasions, - Data
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Potential distribution of Japanese brome (Bromus japonicus) across the contiguous United States (October 2023)
This is a dataset containing the potential distribution of Japanese brome (Bromus japonicus). We developed habitat suitability models for Japanese brome, as suggested by Department of Interior land management agencies. We applied the modeling workflow developed in Young et al. 2020 to species not included in the original case studies. Our methodology balanced trade-offs between developing highly cManagement summary table for INHABIT species potential distribution across the contiguous United States: additional management units
We developed habitat suitability models for invasive plant species selected by Department of Interior land management agencies. We applied the modeling workflow developed in Young et al. 2020 to species not included in the original case studies. Our methodology balanced trade-offs between developing highly customized models for a few species versus fitting non-specific and generic models for numerThresholded abundance models for three invasive plant species in the United States
We developed habitat suitability models for three invasive plant species: stiltgrass (Microstegium vimineum), sericea lespedeza (Lespedeza cuneata), and privet (Ligustrum sinense). We applied the modeling workflow developed in Young et al. 2020, developing similar models for occurrence data, but also models trained using species locations with percent cover ≥10%, ≥25%, and ≥50%. We chose predictorINHABIT species potential distribution across the contiguous United States (ver. 3.0, February 2023)
We developed habitat suitability models for invasive plant species selected by Department of Interior land management agencies. We applied the modeling workflow developed in Young et al. 2020 to species not included in the original case studies. Our methodology balanced trade-offs between developing highly customized models for a few species versus fitting non-specific and generic models for numerData on how Lepidium draba responds to damage of clones
A greenhouse experiment was conducted to test the ability of the invasive clonal plant, Lepidium draba, to cope with damage to local and different ramets. The experiment was arranged in a fully factorial split-pot design that was blocked by bench position and provenance population of the plant. Plants were grown in 'split pots', where two adjoining pots were glued together with a small opening forData on grasshopper composition in the Thunder Basin National Grassland, Wyoming, USA
Grasshopper biomass and species-level diversity was recorded at locations on and off prairie dog colonies in the Thunder Basin National Grassland, Wyoming, USA. Data were collected in order to record the association between grasshopper communities and prairie dog colonies.Data for a lab study of the effects of diet variability on the interactions between a Lepidopteran herbivore and its parasitoid
Data were collected from two laboratory rearing experiments conducted in 2018 of Trichoplusia ni caterpillars that had been parasitized by Copidosoma floridanum parasitoids. In the first experiment, parasitized caterpillars were fed artificial diets spiked with increasing concentrations of the phytochemical xanthotoxin in order to assess the effect of xanthotoxin on parasitoid success. In the secoGreenhouse observations of plant herbivore interactions on Lepidium draba to test effects of ontogenic variability
Data were collected from an experimental greenhouse study in which Lepidium draba plants were grown from root cuttings to create plants at different ontogenic stages. Plants were arranged in mixed-age and single-age stands and exposed to the Lepidopteran herbivore, diamondback moth caterpillars. The success (biomass gain and surivival) of herbivores, the amount of feeding, and the growth of plantsCalifornian crop pests, pesticide applications, and phylogenetic information of crops
Information on pesticide applications, crop pests, and phylogenetic affinities between Californian crops and regional native plants were compiled. Data was collected to inform models of pesticide applications and host use of pests among California's 93 major crops. Pesticide data was assembled from California Department of Pesticide Regulation records, pest information was assembled from the CalifData on the impacts of garlic mustard from a weeding experiment in Pennsylvania 2006-2016
Data were collected on the abundance of plants in a 10-year weeding experiment of garlic mustard, located at Trillium Trails Park in Pennsylvania. Garlic mustard was weeded annually to suppress its abundance, and the impacts of garlic mustard were measured based on the response of the plant community to garlic mustard weeding. Because garlic mustard is known to suppress mycorrhizal fungi, the mycoData on prairie dogs, plants, arthropod biomass, and birds for Thunder Basin, Wyoming in 2017
Data were collected in 2017 by researchers at the USGS, USDA-ARS, and University of Wyoming on the food webs of plants, prairie dogs, arthropods, and birds in the Thunder Basin National Grassland. Data were collected from 87 sites in order to parameterize a structural equation model linking prairie dog impacts to changes in vegetation, arthropods, and birds. Abiotic information such as topographicData on interannual seed set variation, weather, and reproductive traits for global plants
Data were collected on seed production dynamics of long-lived plants, reproductive plant traits of those plant species, and weather variability for sites where those species live. Data include the coefficient of variation in seed production over time, the variation (coefficient of variation or standard deviation) in weather over years, and reproductive traits such as pollination mode and seed disp - News
*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