Blocking Species Invasions in the Bay
June 2009 • Volume 8, Number 2
Patrick Kangas monitors rising levels on his oxygen meter

The Tamoyo Maiden, a ship out of the Philippines, recently delivered sugar from Mexico to the Domino Sugar refinery in Baltimore, Maryland. Travelling around the globe, taking on and discharging ballast water from faraway ports, ships like the Tamoyo have the potential to bring non-native species into Bay waters. Laws and regulations, enforced by the U.S. Coast Guard, are in place to make sure they don't. But ballast water exchange can put ships in danger, and may not kill all the hithchiking species. Could new technology that does not require ballast water exchange better prevent species invasions and keep ships at sea safer?  more . . .


Skeptics question whether an invasive species has ever really caused significant ecological damage in the Bay. The answer, this article says, is yes.  more . . .

zebra mussels discharging ballast
DC Reflecting Pool - photo by Michael W. Fincham

Scientists visiting from Florida in the early 1980s identified an invasive grass species growing in Constitution Lake on the National Mall. How did it get there? And how did it spread to the Potomac River?  more . . .

Invasive species get to the Bay in a variety of ways. Once here, their effects can be devastating.  more . . .

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We gratefully acknowledge support for Chesapeake Quarterly from the Chesapeake Bay Trust for 2009.

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