Duffy Lab Research Research in the Duffy Lab lies at the interface of evolutionary, community and disease ecology, and utilizes a combination of field, lab and theoretical studies. Most research focuses on the evolutionary and community ecology of infectious diseases, particularly in natural populations of Daphnia. Some particular foci of our recent work include eco-evolutionary dynamics, the influences of food webs on host-parasite interactions, and multihost, multiparasite interactions. Some of our ongoing research is described below: |
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1. How does community context influence epidemic size and evolution in host-parasite interactions? A major focus of research in the Duffy Lab is on the ways in which ecological and evolutionary processes jointly influence host-parasite dynamics. A particular focus has been on how rapid evolution influences ecological host-parasite dynamics, and how ecological context influences evolution in host-parasite systems. In a series of papers (e.g., Duffy & Sivars-Becker 2007, Duffy et al. 2008, Duffy & Hall 2008, Duffy et al. 2009), we have shown that host populations can evolve rapidly in response to parasite epidemics, and that host evolution can alter ecological dynamics. More recently, we have shown that the ecological context of the host-parasite interaction (specifically, the predation and productivity environments) influences the size of epidemics which, in turn, influences evolution of host populations (Duffy et al 2012). |
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2. What are the direct and indirect effects of predators on host-parasite interactions? |
A larva of the phantom midge Chaoborus |
3. Evolution of Multi-Host Parasites and Effects on Invasive Species We have recently begun studying multihost parasites; most parasites can infect multiple host species. While this can be challenging to study in many cases, Daphnia are well-suited to studies addressing how parasites deal with trying to infect multiple host species. Our work on multihost parasites has, to date, focused on the bacterial pathogen Pasteuria ramosa. This parasite can infect multiple host species (e.g., Duffy et al. 2010). In Georgia, Pasteuria appears to have shifted to infect a novel host, the invasive Daphnia lumholtzi. We will study how parasites evolve after shifting to a novel host and how parasitism influences the population dynamics of indigenous and non-indigenous hosts. This links with earlier work in which we asked how parasites might influence invasive species (Kestrup et al. 2011). |
Daphnia lumholtzi infected with Pasteuria ramosa |
This research has been supported by funding from the National Science Foundation. | |
Collaborators Long-term collaborators on the above projects include Carla Cáceres (University of Illinois) and Spencer Hall (Indiana University). |