I am a broadly trained aquatic microbial ecologist, with a focus on the community ecology of plankton, in particular the role of mesozooplankton (organisms < 2mm in size) and microzooplankton (organisms <200 μm in size) in pelagic food webs. I have investigated the distribution, composition and trophic ecology of meso- and microzooplankton in a range of aquatic environments, from the open ocean (equatorial Pacific) to coastal and estuarine regions (coastal CA, San Francisco Estuary, Columbia River Estuary) to freshwater rivers and lakes (Columbia River, Vancouver Lake). I am especially interested in how microzooplankton impact the flow of energy through the lower food web, as well as their role in modulating harmful algal blooms and their impact when introduced into novel environments. I have been funded by federal agencies, including the National Science Foundation, the US Geological Survey, NOAA, and the Office of Naval Research, as well as state and regional agencies such as the Washington Department of Ecology, WA Department of Fish and Wildlife, Clark County Public Works and the Vancouver Lake Watershed Partnership.
In addition to my scientific research activity, I am also very interested in science education and pedagogy, in particular training and mentoring science graduate and undergraduate students as educators and providing professional development for in-service science teachers. I am currently lead PI and Project Director for a National Science Foundation Research Experiences for Undergraduates (REU) summer program, and was previously the Project Director for a NSF “GK-12” grant that partnered WSUV environmental science graduate students with public school teachers Clark County. I also teach science pedagogy courses for graduate students at WSU Vancouver.
Dexter* E, Vuilleumier S, Goudet J, Pfeifer S, Bollens S, Rollwagen-Bollens G, Cordell J, Soh H. (In Press) The invasion history of the calanoid copepod Pseudodiaptomus inopinus. Biological Invasions.
Rollwagen-Bollens G, Thiers P. (2017) Teaching socio-environmental synthesis to undergraduates: A case study with non-traditional college students. Teaching Issues and Experiments in Ecology Vol. 12: Practice #4 [online]. http://tiee.esa.org/vol/v12/issues/rollwagen-bollens/abstract.html
Hawthorne D, Jiru M, Rollwagen-Bollens G, Rashid K, Solomon C, Thiers P. (2017) Engaging undergraduate students in socio-environmental synthesis. Teaching Issues and Experiments in Ecology, Vol. 12: Commentary. http://tiee.esa.org/vol/v12/issues/commentary.html
Hassett* W, Bollens S, Counihan T, Rollwagen-Bollens G, Zimmerman J, Katz S, Emerson J. (2017) Veligers of the invasive Asian clam Corbicula fluminea in the Columbia River Basin: Broadscale distribution, abundance and ecological associations. Lake and Reservoir Management 33: 234-248.
Rose+ V, Rollwagen-Bollens G, Bollens S. (2017) Interactive effects of phosphorus and zooplankton grazing on harmful algal blooms in a shallow temperate lake. Hydrobiologia 788: 345-359.
Lee* T, Bollens S, Rollwagen-Bollens G, Emerson J. (2016) The effects of eutrophication and invasive species on zooplankton community dynamics in a shallow temperate lake. Fundamental and Applied Limnology 188: 215-231.
Bowen* A, Rollwagen-Bollens G, Bollens S, Zimmerman J. (2015) Feeding of the invasive copepod Pseudodiaptomus forbesi on natural microplankton assemblages within the lower Columbia River. Journal of Plankton Research 37: 1089-1094.
Lee* T, Rollwagen-Bollens G, Bollens S. (2015) The influence of water quality variables on cyanobacteria blooms and phytoplankton community composition in a shallow temperate lake. Environmental Monitoring and Assessment 187: 315. doi:10.1007/s10661-015-4550-2
Dexter* E, Bollens S, Rollwagen-Bollens G, Emerson J, Zimmerman J. (2015) Persistent vs. ephemeral invasions: 8.5 years of zooplankton community dynamics in the Columbia River. Limnology & Oceanography 60: 527-539.
Breckenridge J, Bollens S, Rollwagen-Bollens G, Roegner C. (2015) Plankton assemblage variability in a river-dominated temperate estuary during late spring (high flow) and late summer (low flow) periods. Estuaries and Coasts 38: 93-103.
Lee* T, Rollwagen-Bollens G, Bollens S, Faber-Hammond J. (2015) Environmental influences on cyanobacteria abundance and microcystin toxin production in a shallow temperate lake. Ecotoxicology and Environmental Safety 114: 318-325.
Dresner M, Braun S, Handelman C, Rollwagen-Bollens G. (2014) Environmental identity, pro-environmental behaviors and civic engagement of volunteer stewards in Portland area parks. Environmental Education Research 21: 991-1010.
Chang H, Thiers P, Netusil N, Yeakley A, Rollwagen-Bollens G, Bollens S, Singh S. (2014) Relationships between environmental governance and water quality in a growing metropolitan area of the Pacific Northwest, USA. Hydrology and Earth Systems Science 18: 1383-1395.
Rollwagen-Bollens G, Bollens S, Gonzalez A, Zimmerman J, Lee* T, Emerson J. (2013) Feeding dynamics of the copepod Diacyclops thomasi before, during and following filamentous cyanobacteria blooms in a large, shallow temperate lake. Hydrobiologia 705: 101-118.
Bollens S, Quenette* J, Rollwagen-Bollens G. (2012) Predator-enhanced diel vertical migration in a planktonic dinoflagellete. Marine Ecology Progress Series 447: 49-54.
Friedenberg* L, Bollens S, Rollwagen-Bollens G. (2012) Feeding dynamics of larval Pacific herring (Clupea pallasi) on natural assemblages of microplankton. Fisheries Oceanography 21: 95-108.
Bollens S, Breckenridge J, Cordell J, Rollwagen-Bollens G, Kalata O. (2012) Invasive copepods in the Lower Columbia River Estuary: Seasonal abundance, co-occurrence and potential competition with native copepods. Aquatic Invasions 7: 101-109. doi: 10.3391/ai.2012.7.1.011.
Boyer* J, Rollwagen-Bollens G, Bollens S. (2011) Microzooplankton grazing before, during and after a cyanobacterial bloom in Vancouver Lake, Washington, USA. Aquatic Microbial Ecology64: 163-174.
Rollwagen-Bollens G, Gifford* S, Bollens S. (2011) The Role of Protistan Microzooplankton in the Upper San Francisco Estuary Planktonic Food Web: Source or Sink? Estuaries & Coasts 34: 1026-1038.
Bollens S, Rollwagen-Bollens G, Quenette* J, Bochdansky A. (2011) Cascading migrations and implications for vertical fluxes in pelagic ecosystems. Journal of Plankton Research 33: 349-355.
Bochdansky A, Bollens S, Rollwagen-Bollens G. (2010) The effect of microzooplankton and copepods on vertical carbon fluxes in and around phytoplankton thin layers. Marine Ecology Progress Series 401: 179-196.
Gifford*, S.M., Rollwagen-Bollens, G.C., Bollens, S.M. (2007) Mesozooplankton omnivory in the upper San Francisco Estuary. Marine Ecology Progress Series 348: 33-46
Slaughter, A.M., Bollens, S.M., Rollwagen Bollens, G.C. (2006) Grazing impact of mesozooplankton in an upwelling region off northern California, 2000-2003. Deep-Sea Research II 53: 3099-3115
Rollwagen Bollens, G.C., Bollens, S.M., Penry, D.L. (2006) Vertical distribution of micro- and nanoplankton in the San Francisco Estuary, in relation to hydrography and predators. Aquatic Microbial Ecology 44:143-163
Rollwagen Bollens, G.C. and Penry, D.L. (2003) Feeding dynamics of Acartia spp. copepods in a large, temperate estuary (San Francisco Bay, CA). Marine Ecology Progress Series 257: 139-158
Rollwagen Bollens, G.C. and Landry, M.R. (2000) The biological response to iron fertilization in the eastern equatorial Pacific (IronEx II). II. Mesozooplankton abundance, biomass, depth distribution and grazing. Marine Ecology Progress Series 201: 43-56.
Coale, K., Johnson, K., Fitzwater, S., Gordon, R., Tanner, S., Chavez, F., Ferioli, L., Sakamoto, C., Rogers, P., Millero, F., Steinberg, P., Nightingale, P., Cooper, D., Cochlan, W., Landry, M., Constantinou, J., Rollwagen, G., Trasvina, A., Kudela, R. (1996) A massive phytoplankton bloom induced by an ecosystem-scale iron fertilization experiment in the equatorial Pacific Ocean. Nature 383: 495-501.