GLIN Daily News About GLIN
AboutEnvironmentHistory/CultureGeographyPollutionCareers/BusinessTeachers' Corner
water photo
What's New?

MSU conference explores need for greater international cooperation to protect vital global watersheds
MLive (11/25)
A recent Michigan State University workshop focused on water rights and improving cross-border policies for the protection of the great waters of the world.

VU students testing area waters
The Northwest Indiana Times (11/21)
Students of Valparaiso University, Ind., were at Lake Michigan to work on water quality measurements for an Environmental Protection Agency education project.

Forest Hills students put surf boards to the test in Lake Michigan
MLive (11/20)
Surf’s up! Well at least it was for some lucky students from Forest Hills Public Schools on Thursday, Nov. 19. Twenty students from each of the district’s three high schools had an opportunity to surf 10- to 12-foot waves at Grand Haven State Park, Mich.

City says yes to dock sale
Traverse City Record-Eagle (11/3)
In Traverse City, Mich., commissioners agreed to sell the coal dock marina to a group of nonprofit organizations focused on Great Lakes history, education and environmental protection to expand use for nonprofits and construct new, modern facilities.

TVDSB high school students learn about importance of Great Lakes
St. Thomas Times-Journal (10/31)
Participants at the Lake Erie Student Conference spent the day in Port Stanley, Ont., taking demonstrations on water quality testing, commercial fishing, birds of prey and the threat of invasive species.

TEACH Calendar of Events
What's going on in your neighborhood this month? Meet other people and learn together at recreational and educational events! Our new dynamic calendar is updated daily with current educational events.
TEACH Invasive Species

table of contents
The Zebra Mussel
Other species making headlines
How do invasive species get here?
Prevention and control
How can you prevent the spread of nonindigenous species?
References and more information

If you live on the Great Lakes or in a similar coastal area, you've no doubt heard of zebra mussels or sea lamprey. Chances are you've also seen patches of purple loosestrife growing in your community or on the side of a local highway. You might not have recogized this attractive flowering plant as a non-native species, but it is. Although pretty to look at, these purple stalks are choking out native plant species by overtaking and altering their habitat.

Sea Lamprey. Click to see larger image.These are just three of the more than 140 nonindigenous, or invasive, species that have become established in and around the Great Lakes since the 1800s. In fact, due in large part to increases in the volume of shipping traffic, the introduction of new "exotic" species has increased dramatically over the past 50 years. More than 87 nonindigenous aquatic species have been accidentally introduced into the Great Lakes in the 20th Century alone. Once introduced, invasive species must be managed and controlled, as they are virtually impossible to eradicate.

While many non-native species have no serious ecological impact, the introduction of a single key species can, as in the example of the sea lamprey, cause a sudden and dramatic shift in the entire ecosystem's structure. New species can significantly change the interactions between existing species (and between those species and their non-living environment), creating ecosystems that are unstable and unpredictable.

Graphic: Sea Lamprey shown attached to a lake trout. Courtesy U.S. Fish & Wildlife Service.

1 | 2 | 3 | 4 | 5 | 6 | 7   Next page