This page summarizes ongoing research. For prior projects refer to the Publications page.
Disease Vectors in a Changing World
Hawaii’s spectacular honeycreepers are dying of exotic bird malaria transmitted by exotic Culex mosquitoes [Fonseca et al 2006]. To develop predictive models of the impact of co-evolutionary changes on vector-borne disease transmission under current and future climate scenarios we are using comparative genomics and transcriptomics at multiple spatial, temporal and experimental scales. [Funding: NSF Ecology and Evolution of Infectious Diseases – 2017:2021]
Closer to home, we are also examining patterns of northern expansion of the invasive Asian tiger mosquito, Aedes albopictus, as well as the southern mosquitoes Culex erraticus, Aedes atlanticus and Ae. tormentor).
How will salt marsh mosquitoes respond to changes in the salt marsh due to climate change (sea level rise) and marsh resilience efforts? Do marsh mosquito mitigation efforts affect marsh resilience? Uncontrolled salt marsh mosquitoes are a very significant nuisance and can vector the viral agents of Eastern Equine and West Nile encephalitides. [Funding: NOAA-NERRS Science Collaborative Research – 2017:2020]
eDNA for early detection of terrestrial exotic species
Our methodology [Valentin et al 2016; Valentin et al submitted] is transferable to any terrestrial situation where target species’ DNA can be aggregated, suggesting eDNA can potentially transform our ability to respond to biosecurity threats across terrestrial ecosystems. [Funding: USDA-NIFA graduate fellowship to Rafael Valentin – 2017:2018; Farm Bill – pending]
To learn more about eDNA in terrestrial settings, you can either continue your search in the Fonseca Lab webpage or visit InSiTe.
Tick-Borne Pathogen Ecology
Tick borne diseases affect thousands of Americans every year, yet tick ecology, epidemiology and control are still sorely understudied. We are developing strategies for effective surveillance and employing molecular approaches to specifically identify pathogens and primary blood hosts. [Funding: John Drulle Memorial Lyme Fund; New Jersey Health Foundation; Northeast Integrated Pest Management – pending]
Human-mediated Species Expansion
High resolution genetic analyses of Aedes japonicus japonicus, the Asian bush mosquito, reveals that transportation by humans drives their expansion post-introduction [Egizi et al. 2016]. We hypothesize that human-mediated mixing combines adapted traits resulting in domesticated populations more likely to thrive amongst us and bite us.
Population genetic analysis of the worldwide expansion of the brown marmorated stinkbug, Halyomorpha halys, reveals multiple introductions from China not expansion from single introductions [Valentin et al 2017], an emerging pattern likely driven by increased cross-world trade.
Invasive vectors are not just mosquitoes. A tick capable of severely impacting livestock but also a competent vector of deadly human pathogens expanded to Australia and New Zealand last century and establish populations in the US. Indeed, a multigenerational population was detected in Hunterdon County, NJ during the summer of 2017 (Press release). Click on the heading for a summary review of the biology and ecology of this tick species, as well as information on their vectorial capacity.
Invasive mosquitoes are not borne, they are created [Egizi et al 2015]. Hybrid Culex pipiens, which combine the domesticity of the form molestus and the ability to survive in temperate climates of form pipiens [Fonseca et al 2004] drove epidemics of West Nile virus in the US. However, populations of local species such as Cx. restuans that survive in human environments: native invaders [Johnson et al 2015] can facilitate and amplify pathogen transmission.
Unidirectional introgression of Culex quinquefasciatus created Cx. pipiens pallens, an Asian domestic species [Fonseca et al, 2009].