Dr. Leah Mupas Segui (Novak Lab, OSU Integrative Biology) investigated competitive interactions between ringed and signal crayfish and how each species affects leaf litter breakdown and aquatic invertebrate community composition. Crayfish are an integral part of stream ecosystems and are also one of the most widespread aquatic invaders globally.   Ringed crayfish (Orconectes neglectus) were discovered in Oregon's Willamette River drainage in 2015.  Though they have the potential to displace native signal crayfish (Pacifastacus leniusculus) and have been found in other river systems in Oregon, interactions between the two species are largely unknown.   

Mupas Segui, L.  2019. State-structured Species Interactions and Their Consequences Across Levels of Biological Organization (Doctoral dissertation). Zoology, Oregon State University. 
Related article:  Preston, D., Henderson, J., Falke, L., Segui, L., Layden, T. and Novak, M.  2018.  What drives interaction strengths in complex food webs?  A test with feeding rates of a generalist stream predator.  Ecol. 99.7 10.1101/259697.