<i>Ciona robusta</i> (IMAGE)

Smithsonian

<i>Ciona robusta</i>

Caption

The tunicate Ciona robusta ranks as one of San Francisco Bay's most dominant invaders. But it needs salty water to thrive, and its numbers dwindled when a single wet winter sent freshwater streaming into the bay.

Credit

Melissa Frey/Royal British Columbia Museum

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