One of the Manzanita Aphids, Tamalia coweni, is an amazing critter! Native to North America, T. coweni ranges from Baja to Canada and can be found on various species of manzanita (Arctostaphylos spp.)
However, T. coweni is especially common throughout California across many of its ecoregions from the coastal chaparral and nearby mountains, to the Mojave desert, to inland in the central valley and its adjacent forest and mountains. Such diversity in habitat and host make this species a good model to understand how the landscape alters its genome. In collaboration with the California Conservation Genome Project we are sequencing its genome and resequencing individuals found across the state. Together these data will help address the following questions:
- How do elevational or climatic gradients influence phenotypic plasticity?
- How do host species determine the genetics of their parasites?
- How does fire influence a habitat engineer and its affect on recovery?
- What can we learn about the genes an aphid needs to make a gall?
This project is a collaboration with up-state Tamalia expert Dr. Don Miller from California State University, Chico. Dr. Miller's expertise and passion are driving us as we expand our questions to understand how T. coweni supports a community of insects. One particular species (and probably species complex) is T. inquilinus, a social parasite that often displaces T. coweni when it moves into galls it is unable to produce itself. Using a comparative genomics framework and landscape information, we are trying to answer the following questions:
- What genes were lost and gained in the transition to inquilism?
- How speciose is Tamalia?
- What environmental context may enable the evolution of a social parasite?