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Sidhu, CS & EE Wilson Rankin. In press. Distribution and characterization of wild bee nesting sites on San Clemente Island, California Channel Islands. Western North American Naturalist.
Loope, K. J., J. G. Millar, & EE Wilson Rankin. In press. Weak nestmate discrimination behavior in native and invasive populations of a yellowjacket wasp (Vespula pensylvanica). Biological Invasions. doi: 10.1007/s10530-018-1783-3
Levan, K. E., S. K. Barney, & EE Wilson Rankin. In press. Introduced ants reduce interaction diversity in a multi-species, ant-aphid mutualism. Oikos. doi: 10.1111/oik.05043
Merrill, K. C., C. L. Boser, C. Hanna, D. A. Holway, I. Naughton, D. Choe, & EE Wilson Rankin. 2018. Argentine Ant (Linepithema humile, Mayr) Eradication Efforts on San Clemente Island, CA, USA. Western North American Naturalist. 78:e32.
Rankin, D. T., C. J. Clark, & EE Wilson Rankin. 2018. Hummingbirds use taste and touch to discriminate against nectar resources that contain Argentine ants. Behavioral Ecology and Sociobiology. 72:e44.
Knowlton, J. L., D. J. Flaspohler, E. H. Paxton, T. Fukami, C. P. Giardina, D. S. Gruner, & EE Wilson Rankin. 2017. Movement behavior of native Hawaiian birds in a naturally fragmented landscape. Journal of Avian Biology . 48: 920-931.
Dobelmann, J., K. J. Loope, EE Wilson Rankin, O. Quinn, J. W. Baty, M. A. M. Gruber, & P. J. Lester. 2017. Fitness in invasive social wasps: the role of variation in viral load, immune response and paternity in predicting nest size and reproductive output. OIKOS. 126: 1208-1218
Sidhu, C.S., S.M. Calloway, S.K. Barney & EE Wilson Rankin. 2016. Host records of Grammia ursina Schmidt, 2009 on San Clemente Island and its potential effect on rare plant restoration (Lepidoptera: Noctuidae: Arctiinae). Pan Pacific Entomologist. 92(3): 151-156.
Rust, M.K., D. Choe, EE Wilson Rankin, K. Campbell, J. Kabashima, & M. Dimson. 2016. Controlling Yellowjackets with Fipronil-based Protein Baits in Urban Recreational Areas. International Journal of Pest Management. DOI: 10.1080/09670874.2016.1227883
Sidhu, CS & EE Wilson Rankin. 2016. Honey bees avoiding ant harassment at flowers using scent cues. Environmental Entomology. 45(2): 400-426
Wilson Rankin, EE. 2015. Level of experience modulates individual foraging strategies of an invasive predatory wasp. Behavioral Ecology and Sociobiology. 69: 491-499
Wilson Rankin, EE. 2014. Social context influences cue-mediated recruitment in an invasive social wasp. Behavioral Ecology and Sociobiology. 68:1151-1161
Wilson, EE* & EM Wolkovich. 2011. Scavenging: how carnivores and carrion structure communities. Trends in Ecology and Evolution. 26: 129-135.
Wilson, EE*, CS Sidhu, KE LeVan & DA Holway. 2010. Pollen foraging behavior of solitary Hawaiian bees revealed through molecular pollen analysis. Molecular Ecology. 19: 4823-4829.
Wilson, EE* & DA Holway. 2010. Multiple mechanisms underlie displacement of solitary Hawaiian Hymenoptera by an invasive social wasp. Ecology. 91: 3294-3302.
Wilson, EE*, CV Young & DA Holway. 2010. Predation or scavenging? Thoracic muscle pH and rates of water loss reveal cause of death in arthropods. Journal of Experimental Biology. 230: 2640-2646.
Wilson, EE*, LM Mullen & DA Holway. 2009. Life history plasticity magnifies the ecological effects of a social wasp invasion. Proceedings of National Academy of Sciences. 106: 12809-12813.
Eckles, MA, EE Wilson*, DA Holway & JC Nieh. 2008. Protein quality elevates thoracic temperatures of foraging western yellowjackets, Vespula pensylvanica (Hymenoptera: Vespidae). Naturwissenschaften. 95: 787-792.
Wilson, EE*, DA Holway & JC Nieh. 2006. Cold anesthesia decreases foraging recruitment in the New World bumblebee, Bombus occidentalis. Journal of Apicultural Research. 45: 169-172.
Weiss, MR, EE Wilson*, & I Castellanos. 2004. Predatory wasps learn to overcome the defenses of their larval prey. Animal Behaviour. 68: 45-54.
* Prior to 2014, Dr. Wilson Rankin published under the name EE Wilson.


Pollinators and pollination ecology: We are interested in examining pollinators in both urban and natural landscapes and across the urban-natural interface. In urban areas, we are examining how threats from invasive species, drought and human disturbances affect plant-pollinator interactions and pollinator health. These pollinators include bees, butterflies and birds, and plants include drought-tolerant garden species. In natural areas, we are examining pollination of rare and endemic plants for conservation and factors that affect their pollinator communities. Across the California Floristic Province, our macrosystems team is examining how migration of pollinators affects plant-pollinator networks and disease dynamics. For details on this migratory pollinator project, please visit
Influence of climate and diet on invasiveness of social insects: Some yellowjacket species exhibit plasticity in colony cycle in their introduced ranges to include annual and perennial life histories. In western yellowjackets (Vespula pensylvanica), we are looking at how temperature and food availability contribute to the shift in life history (switching from annual colony cycle to perennial colony cycle). Because perennial colonies overwinter and develop very large worker population sizes, perenniality can have a large negative impact on prey species and the ecological services provided by these prey.
Impact of invasive species on food webs and the ecosystem services provided by consumed taxa: Utilizing next-generation sequencing, we can gain a quantitative overview of how species are interacting in an ecosystem before and after invader removal. Combining such diet analyses with landscape scale sampling, we can assess the stability of the ecosystem services provided by affected taxa (natives consumed by the invader or the invader itself).
Molecular approaches to detecting and quantifying invasive species and trophic impacts: We are adapting environmental DNA (eDNA) screening approaches to the soil arthropod communities to identify areas invaded by non-native taxa. In mesocosms, quantitative lab experiments are establishing (1) what is the lowest density at which we can detect invader DNA, and (2) how long invader genetic material will remain detectable after the invader leaves or dies. With an understanding of latency of eDNA in the soil and the sensitivity threshold of detection, we can employ this approach to sample across a large geographical scale in a cost-effective manner.



Jacob Cecala (Ph.D. candidate): pollination ecology in natural, semi-natural and agricultural ecosystems
Rachel Norris (Ph.D. student, co-advised with Kerry Mauck): non-consumptive effects of predators on pest populations
Kevin Loope (postdoc): social evolution, chemical ecology, and the evolutionary ecology of invasive wasps and honeybees (email)(website)
Jenny Hazlehurst (postdoc): pollination networks, animal behavior, plant-animal interactions, coevolution of pollinators and flowering plants, trait-mediated indirect effects. (email)(website)
Giselle Lozano (junior specialist): Drought impacts on`pollinators and their nutrition
Jong Soon Lee (junior specialist): Metabarcoding of predators and pollinators
David Rankin (researcher): hummingbird foraging ecology, interactions between invasive and native floral visitors (email)
Phi Phan (undergraduate researcher): ant-bee interactions and rare plant pollination ecology


Michelle Constanza Miner (MS, 2018): (Now at ARizona-Sonora Desert Museum!) native bee biology and diversity, pollination, protected lands management, desert and Mediterranean ecology
Chien Yu (undergraduate researcher): pollinator diversity across the urban to natural landscape gradient
Sarah Barney (junior specialist): (Now at Michigan!) trophic ecology, arthropod/avian-mediated ecosystem services, molecular genetics and ecology, tropical forest biodiversity and conservation
C. Sheena Sidhu (postdoc): pollination ecology, conservation, and ecosystem services within and across natural-urban interfaces. Now at San Mateo County Department of Agriculture (email)
Korie Merrill (MS, 2015): invasive ant ecology and eradication. Now at the Center for Environmental Management of Military Lands
Veronica Fernandez (technician): Vespula population genetics and eDNA detection of invasive species
Nicole Gutzmann: molecular genetics and eDNA detection of biological invasions

Contact Us

900 University Ave, Riverside, CA 92521

Our lab is located on the first floor of the Entomology Bldg on the University of California Riverside campus.

Erin Wilson Rankin
phone: 951 827 5735

Lab Intro

In the Wilson Rankin lab, we study invasive species ecology, investigating species interactions and their effects on food webs and ecosystem services both at the landscape-level (such as invasive species removal and mitigation) and the individual-level (such as foraging strategies and genetic diet analyses). Much of our work involves native pollinators and invasive social insects in and across the interface of agricultural, natural and urban landscapes. Specific areas of current research involve the effects of drought and fire on pollinator health and diversity, life history evolution of invasive species, disruption of ecosystem services by invasive generalists and trophic impacts of multi-channel omnivory.

Educational and Employment Opportunities

Molecular diet analyses and food webs: Seeking a full time junior specialist to conduct molecular diet analyses and reconstruct food webs. Qualified applicants must have experience with DNA extraction, PCR and best lab practices. Position available July 1, 2018. If interested, please email Dr. Erin Rankin for more details.

Opportunity to study Pollinator Behavior and Interactions! The Wilson-Rankin lab is seeking motivated undergraduates for Summer 2018 with an interests in botany, entomology, biology, and/or ecology to assist a second-year Ph.D. student on a project studying species interactions at nectar resources. The undergraduate assistant will be helping with the collection of data in behavioral assays of bumblebees and ants, as well as in insect collection and maintenance. Position(s) available ASAP. Volunteer (without salary) position, roughly 10-15 hours per week. No prior research experience or specific knowledge required, as training will be provided by grad student. An interest in pollinators, wildlife conservation, ecology, invasive species, or insect behavior and communication is preferred. Must be willing to work with live insects. If interested, please email Prof. Rankin..

Pollinator Identification and Analysis: Seeking UCR undergraduate student (CNAS junior or senior preferred) to help a second-year Ph.D. student in the Wilson-Rankin Lab in the UCR Entomology Department with research during Summer 2018. Position available ASAP. Volunteer (without salary) position, roughly 10-15 hours per week. Responsibilities will include:
* Lab work at UCR. This will involve preparing bees collected from field work for preservation and subsequent identification, as well as performing tasks in ArcGIS software and processing insect samples for toxicity analyses.
* Plant maintenance. Sowing seeds and regular watering and pruning of plants in the glass greenhouses at UCR.
* Field work. Accompanied by the graduate student, field work will take place in suburban areas in Riverside, San Diego, Orange, and Los Angeles counties. Fieldwork typically occurs weekday mornings between 7am and 12pm, from early March to late October. Procedures involve setting out traps for insects, surveying and identifying plants, and netting and observing insects. No prior research experience or specific knowledge required, as training will be provided by grad student. An interest in pollinators, wildlife conservation, community ecology, and/or urban biodiversity is preferred. If interested, please email Prof. Rankin.

Any undergraduate students interested in volunteering or seeking research experience are encouraged to contact Dr. Rankin.