A graph of the number of unfrosted flowers of the aspen sunflower (Helianthella quinquenervis) from an annual count in a 10x45m plot at the Rocky Mountain Biological Laboratory, Gothic, Colorado, by David Inouye. Note the significant fluctuation in the number of heads produced from year to year.

Publisher: EcoEd Digital Library

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It is not surprising that humans have profoundly altered the global nitrogen (N) cycle in an effort to feed 7 billion people, because nitrogen is an essential plant and animal nutrient. Food and energy production from agriculture, combined with industrial and energy sources, have more than doubled the amount of reactive nitrogen circulating annually on land. Humanity has disrupted the nitrogen...

Publisher: EcoEd Digital Library

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This January 2012 press release introduces and describes the significance of issue #15 of ESA's Issues in Ecology series, "Excess Nitrogen in the U.S. Environment: Trends, Risks, and Solutions."

Publisher: EcoEd Digital Library

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This November 2011 press release can be used as an accessible reading assignment to accompany and introduce a discussion of the ecological concepts included in issue #14 of ESA's Issues in Ecology series, "Using air pollution thresholds to protect and restore ecosystem health."

Publisher: EcoEd Digital Library

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A central challenge for college-level science and ecology students is understanding the significance of peer-reviewed scientific literature. Such literature is increasingly easy to access, but students have little appreciation for how it is generated and little insight into how it should be critiqued. We propose a simple exercise that demonstrates the importance of a critical reading of not...

Publisher: EcoEd Digital Library

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