This video segment from Evolution: "Extinction!" shows how biological control is successfully combating North Dakota's infestation of leafy spurge, a non-native plant. [4:43]

This video segment from Evolution: "Extinction!" shows the impact of invasive species on native ecosystems. [3:23]

This video adapted from KTOO explores why the beaches of Latouche Island and Knight Island, Alaska, contain remnants of an oil spill and discusses its resulting impact on the Alutiiq community of Chenega Bay.3m 37s

In this video, Paul Andersen explains how ecosystems respond to disruptions. Disruptions can cause changes in the number and variety of organisms. It can also lead to migration, extinction or even speciation. Ecosystems that have higher...