Mike Madritch
Postdoctoral
Associate
Department
of Entomology
Phone:
608-262-4319
E-mail:
Mike Madritch
Education
Ph.D.
Ecology.
B.S. Biochemistry
B.S. Biological Sciences
B.A. Chemistry
Minor, Genetics
Research Interests
Ecosystem processes
Terrestrial biogeochemistry, nutrient
cycling
Plant-animal interactions
Community and ecosystem process linkages
Biodiversity (intra- and interspecific)
influences on community and ecosystem processes
Invasive species
Current Projects
Genetic variation and
herbivory in aspen: consequences for ecosystem function
This is the
main focus of my work at UW with Rick Lindroth. This project integrates two major themes -
the ecosystem consequences of both intraspecific
genetic variation and herbivory - through the shared common denominator of
plant chemical composition. Plant chemistry plays a key role in governing
ecosystem processes such as decomposition and subsequent nutrient cycling.
Plant chemistry also influences, and is influenced by, insect herbivory. We are
investigating the independent and interactive effects of intraspecific
genetic variation, resource availability, and herbivory on leaf litter
decomposition and subsequent nutrient cycling.
We use a
combination of microcosm, mesocosm, and field
experiments to test our hypotheses. Although microcosms may be
artificial, they help clarify mechanisms that
underlie ecological interactions. At the other extreme, it is often difficult
to discern cause-and-effect relationships using natural field observations, yet
they are well suited for long-term ecosystem level measurements.
Influence of tannins
on belowground processes
Secondary
metabolites, such as tannins and phenolic glycosides,
have historically been considered important herbivore defense mechanisms.
However, it is becoming increasingly apparent that the secondary chemistry of
forest leaves have important "afterlife" effects when they enter the detrital pathway. Portions of my research investigate how
qualitative and quantitative variation in secondary metabolites influences
belowground processes and microbial activity.
Invasive Species and
Ecosystem Functioning
Common
buckthorn (Rhamnus cathartica)
is an exotic shrub that is a severe invader in much of the northern
Other, much better, links: