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View Resource Abandoned mine drainage stream in productive woods

abandoned mine drainage, Pennsylvania, anthracite mining

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View Resource A male Klug's clearwing butterfly (Dircenna klugii klugii) foraging on a coffee flower (Coffea arabica) in Finca Irlanda of the Sonusco region of Chia

A male Klug’s clearwing butterfly (Dircenna klugii klugii) foraging on a coffee flower (Coffea arabica) in the Soconusco region of Chiapas, Mexico. Shade-grown coffee certification programs...

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View Resource Obtaining sediment core from Windy Lake in British Columbia

This photograph shows scientists obtaining sediment core, which is useful in studying changes in forest composition, the frequency of forest fires, and climate change over the past 10,000 years. ...

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View Resource Lake levels and drought indices in northern Wisconsin: data, graphs, and photographs.

These materials include 25-year records of lake levels in 7 lakes in Northern Wisconsin, Palmer Drought Severity Index (PDSI) and precipitation; graphs illustrating changes in lake levels over time;...

View Resource Foraging and Flocking Behavior

In this laboratory exercise, the following issues are examined: 1) why neither predators nor prey go extinct when there is a long period of nonrenewal of the prey population 2) the effects of...

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