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Audience is Undergraduate upper division 15-16
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View Resource Aerial view of the upper Willamette River, Oregon.

Aerial view of the upper Willamette River, Oregon. Although some off-channel features and riparian forest remain, particularly in upper reaches as illustrated here, overall the Willamette River has...

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View Resource An African elephant (Loxodonta africana) in a savannah ecosystem within Kruger National Park, South Africa.

African elephants (Loxodonta Africana) have an important impact on that ecosystem type, influencing its structure, function, and composition. In Kruger National Park, South Africa, park scientists,...

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View Resource A grey tree frog (Hyla versicolor).

A grey tree frog (Hyla versicolor). Amphibian species are declining globally, and pesticides may play a role, but their concentrations are often low in nature. Carbaryl is a common pesticide that can...

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View Resource A field planted with two kinds of cotton (Gossypium sp): Bt cotton and normal cotton, where the normal cotton acts as a refuge for insects.

Some rows of the field in the photograph contain cotton plants (Gossypium sp) that are genetically engineered to produce a toxin from the bacterium Bacillus thuringiensis (Bt). Bt kills insects that...

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View Resource A female silver studded blue butterfly (Plebejus argus) on a shrub in the Donana National Park of southern Spain.

A female silver studded blue butterfly (Plebejus argus) on a shrub in the Donana National Park of southern Spain. P. argus has a mutualistic association with ants of the genus Lasius and uses the...

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