Patrice looks at how invasive species can change an environment. She then joins Dave and they look at the impact milfoil has on aquatic communities. We then take an up-close look at the mute swan. Finally, Emily and Sam visit with Professor Jim Morin and his researchers from the Shoals Marine Lab and learn about an invasive seaweed in the waters off their island.
Aired: 05/10/10Video has closed captioning.