Publications

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ecosystem transformations of the laurentian great lake michigan by nonindigenous biological invaders.lake michigan, a 58,000-km(2) freshwater inland sea, is large enough to have persistent basin-scale circulation yet small enough to enable development of approximately balanced budgets for water, energy, and elements including carbon and silicon. introduction of nonindigenous species-whether through invasion, intentional stocking, or accidental transplantation-has transformed the lake's ecosystem function and habitat structure. of the 79 nonindigenous species known to have established reproducti ...201322809179
incidental oligotrophication of north american great lakes.phytoplankton production is an important factor in determining both ecosystem stability and the provision of ecosystem goods and services. the expansive and economically important north american great lakes are subjected to multiple stressors and understanding their responses to those stresses is important for understanding system-wide ecological controls. here we show gradual increases in spring silica concentration (an indicator of decreasing growth of the dominant diatoms) in all basins of la ...201121417221
elucidating causes of diporeia decline in the great lakes via metabolomics: physiological responses after exposure to different stressors.the benthic macroinvertebrate diporeia spp. have been extirpated from many areas of the laurentian great lakes, but the mechanisms underlying such declines are not fully understood. diporeia declines coinciding with the invasion of exotic dreissenid mussels (zebra and quagga) have led to the hypothesis that diporeia declines are a result of decreased food availability from increasing competition with dreissenids for diatoms. there is additional evidence that diporeia are negatively affected when ...201323434781
influence of cladophora-quagga mussel assemblages on nearshore methylmercury production in lake michigan.recent spread of invasive mussels in lake michigan has altered primary productivity in the nearshore zone, resulting in proliferation of filamentous benthic green algae (cladophora glomerata). in areas of dense cladophora and quagga mussel (dreissena bugensis) assemblages, as well as in regions where sloughed cladophora accumulates, methylmercury (mehg) production is enhanced. a shoreline transect from a river mouth through waters overlying cladophora/quagga-rich zones showed that aqueous mehg c ...201526007285
do invasive quagga mussels alter co2 dynamics in the laurentian great lakes?the laurentian great lakes have experienced unprecedented ecological and environmental changes, especially after the introduction of invasive quagga mussel (dreissena rostriformis bugensis). while impacts on ecological functions have been widely recognized, the response of carbon dynamics to invasive species remains largely unknown. we report new co2 data showing significant increases in pco2 (up to 800 μatm in lake michigan) and co2 emission fluxes in most of the great lakes compared to those p ...201627996017
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