John E Petersen

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T recent literature in ecosystem ecology reveals two parallel trends. The first is an increased recognition of the importance of time and space scales as determinants of the patterns researchers observe and predict. This is evident in the steady increase in the number of journal articles listing scale as a keyword (figure 1a; Schneider 2001) and in the(More)
Enclosed, experimental ecosystems (“mesocosms”) are now widely used research tools in ecology. However, the small size, short duration and often simplified biological and physical complexity of mesocosm experiments raises questions about extrapolating results from these miniaturized ecosystems to nature. Dimensional analysis, a technique widely used in(More)
We developed incubation chambers of clear acrylic extending the full depth of the water column to measure in situ depth-integrated community metabolism in experimental planktonic–benthic ecosystems. A magnetic stirring apparatus at mid-depth in each chamber prevented stratification and maintained a vertical turnover time that roughly matched turnover in the(More)
The diversity of plant species and their distribution in space are both thought to have important effects on the function of wetland ecosystems. However, knowledge of the relationships between plant species and spatial diversity remains incomplete. In this study, we investigated relationships between spatial pattern and plant species diversity over a five(More)
"Campus Conservation Nationals" (CCN) is a recurring, nation-wide electricity and water-use reduction competition among dormitories on college campuses. We conducted a two year empirical study of the competition's effects on resource consumption and the relationship between conservation, use of web technology and various psychological measures. Significant(More)
Tackling complex environmental challenges requires the capacity to understand how relationships and interactions between parts result in dynamic behavior of whole systems. There has been convincing research that these "systems thinking" skills can be learned. However, there is little research on methods for teaching these skills to children or assessing(More)
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