Hannah J. Broadley

Hannah J. Broadley Headshot

PhD Candidate

B.S., Bates College, May 2010

M.S. Umass Amherst, Febuary 2016

Advisor: Joseph S. Elkinton

Research Interests

Using a population ecology and insect pathology perspective, I study different agents of mortality on a non-native forest pest, winter moth (Operophtera brumata), as compared to the mortality acting on a native congener Bruce spanworm (Operophtera bruceata). In particular, I am interested in the interchange between natural enemies (pathogens, parasites, and predators) between the native and introduced species and their population-level effects.  My research has three components: (1) Considering mortality of winter moth from predators, parasitism, and disease and comparing these mortality factors to that of the native congener Bruce spanworm, (2) Evaluating predation by large invertebrates (e.g. Carabid and Staphylinid beetles) and small mammals (e.g. shrews) and parasitism by an array of native parasitoids on winter moth pupae, and (3) Understanding cold hardiness and overwintering mortality of winter moth in comparison to Bruce spanworm.


Winter moth caterpillers


A microsproridia infection                               One of the native parasitoids affecting winter moth


Broadley, H.J., E.A. Kelly, J.S. Elkinton, R. Kula, and G.J. Boettner. Identification and impact of hyperparasitoids and predators affecting Cyzenis albicans (Tachinidae), a recently introduced biological control agent of winter moth (Operophtera brumata, L.) in the northeastern U.S.A. Biological Control. In Press. 

Buckman, K.L., V.F. Taylor, H.J. Broadley, D. Hocking, P. Balcom, R. Mason, K. Nislow, and C.Y. Chen. 2017. Methylmercury bioaccumulation in an urban estuary: Delaware River USA. Estuaries and Coasts. DOI 10.1007/s12237-017-0232-3. 

Broadley, H.J., M. Boucher, J.P. Burand, and J.S. Elkinton. 2016. The phylogenetic relationship and cross-infection of nucleopolyhedroviruses between the invasive winter moth (Operophtera brumata) and its native congener, Bruce spanworm (O. bruceata).  Journal of Invertebrate Pathology, 143:61-68.

Havill, N.P., J.S. Elkinton, J.C. Andersen, S.B. Hagen, H.J. Broadley, G.J. Boettner, A. Caccone. 2016. Asymmetric hybridization between non-native winter moth, Operophtera brumata (Lepidoptera: Geometridae), and native Bruce spanworm, O. bruceata, in the northeastern United States, assessed with novel microsatellites and SNPs. Bulletin of Entomological Research. DOI:10.1017/S0007485316000857

Pepi, A.A., H.J. Broadley, and J.S. Elkinton. Density-dependent effects of larval dispersal mediated by host plant quality on population of an invasive insect. 2016. Oecologia, 182:499 – 509. DOI: 10.1007/s00442-016-3689-z

Chaves-Ulloa, R., B.W. Taylor, H.J. Broadley, K.L. Cottingham, N.A. Baer, K.C. Weathers, H.A. Ewing, C.Y. Chen. 2016. Dissolved organic carbon modulates mercury concentrations in insect subsidies from streams to terrestrial consumers. Ecological Applications, 26(6):1771-1784. DOI:10.1890/15-0025.1

Buckman, K.L., M. Marvin-DiPasquale, V.F. Taylor, A. Chalmers, H.J. Broadley, J. Agee, B.P. Jackson, C.Y. Chen. 2015. Influence of a chlor-alkali superfund site on mercury bioaccumulation in periphyton and low-trophic level fauna.  Environmental Toxicology. DOI: 10.1002/etc.2964

Broadley, H.J., K.L. Buckman, D.M. Bugge, and C.Y. Chen. 2013. Spatial variability of metal  bioaccumulation in estuarine killifish (Fundulus heteroclitus) at the Callahan mine superfund site, Brooksville, ME. Archives of Environmental Contamination and Toxicology, 65:765–78.