Dr. Donald F. Charles

(Indiana University, 1982)

Phycology Section Website

Diatoms as water quality indicators; paleolimnological approaches for inferring change in biology and chemistry of lakes; lake management; assessment of perturbations in aquatic ecosystems due to municipal and industrial effluents, land-use change, acid deposition, eutrophication and climate change.

Dr. Richard J. Horwitz

(University of Chicago, 1976)


Reproductive ecology, life history and distribution of freshwater fishes; effects of land use, habitat structure and hydrology on population dynamics and species composition in aquatic systems; ecological modeling and biometry; anthropogenic contaminants in fishes.

Dr. Jerry V. Mead

Watershed and Systems Ecology
(SUNY College of Environmental Science and Forestry, 2007)


Spatial modeling of aquatic ecosystems; bioenergetics of aquatic invertebrates and fishes; effects of water level management on aquatic organisms; biophysical economics and watershed planning; stream geomorphology and environmental conditions; economics and bioconservation; energy and fisheries.

Dr. Sonja Hausmann

(University of Bern, 2001)

Office: 215-299-1135
Lab: 215-299-1102

Identification of diatoms from lake or stream samples; development of water quality criteria for lakes and streams using diatoms archived in lake sediments or from benthic samples; quantitative reconstruction of climate change or eutrophication using diatoms.

Dr. Tracy Quirk

(University of Delaware)


Dr. Quirk is a wetland ecologist interested in vegetation dynamics in coastal wetlands including factors that influence organic matter accumulation and decomposition and carbon and nutrient cycling. Her recent dissertation research was on the distribution of carbon and nitrogen pools in a salt marsh fringing a coastal lagoon and ecotypic variation of wetland plant species in biomass, carbon and nutrient allocation. Her current work includes establishing long‑term fixed station monitoring of tidal wetlands along the Delaware Estuary and Barnegat Bay. The goal is to relate factors of soil and water chemistry, plant biomass, hydrology, and elevation to wetland accretion rate to determine whether these wetlands will be able to maintain their elevation relative to sea level.

Dr. David J. Velinsky

Environmental Biogeochemistry
(Old Dominion University, 1987)


Geochemical cycling of organic and inorganic constituents of sediments and waters; Sedimentary diagenesis of major and minor elements; Isotope biogeochemistry of carbon, nitrogen and sulfur in marine and freshwater systems.

Dr. Velinsky is the Department Head for the Department of Biodiversity, Earth & Environmental Science at Drexel University.

Research Associates

Dr. Jeffrey T. F. Ashley

(University of Maryland, 1998)


Sources, transport, and fate of bioaccumulative, persistent organic contaminants in natural waters; modeling the bioaccumulation of pollutants in aquatic food webs; the role of eutrophication in determining organic contaminant exposure to organisms; environmental analytical chemistry, assessment of contaminated fisheries.

Dr. Raymond W. Bouchard

(University of Tennessee, 1972)

Systematics, zoogeography, evolution, ecology and functional morphology of Holarctic crayfishes; ecology of neotropical phytotelmata; systematics and zoogeography of neotropical freshwater decapod crustaceans.

Senior Aquatic Entomologist

Brett Marshall, M.Sc.

Aquatic Insects
(Virginia Tech)

(406) 282-0050

Effects of environmental changes on the structure and function of aquatic ecosystems and aquatic insect assemblages; secondary production and life-history; bioassessment impact or risk assessment; limitations of bioassessment methods when applied to address ecological questions. Visit to occasionally view highlights of cutting edge findings.

Environmental Research