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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 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 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 Pacific trillium (Trillium ovatum) flowering in the Siskiyou Mountains of Oregon.

Pacific trillium (Trillium ovatum) flowering in the Siskiyou Mountains of Oregon. Cascading effects of forest fragmentation include reduced recruitment of Pacific trillium as a result of positive...

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View Resource An oblique aerial view of the Mullica River showing an invasive reed (Phragmites australis) and two species of native grasses (Spartina spp.).

In this oblique aerial view of Hog Island in the Mullica River, a common reed (Phragmites australis; in green) is visible. P. australis was first observed spreading rapidly on upper Hog Island in...

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