Even before zebra and quagga mussels arrived in the Great Lakes in the 1980s, the future looked a little bleak for native mussels. The invaders came close to wiping them out entirely. But small populations in Lake Erie appear to not only be surviving the invasion, but thriving. 

Average density of native mussels before the arrival of zebra mussels was two per square meter in Lake St. Clair. By 1990, zebra mussel density was at 1,600 per square meter. 

“By 1992, native mussel populations are almost gone from the southeastern portion of the lake and declining rapidly in the northwestern portion of the lake,” said [Dave] Zanatta, [a biologist at Central Michigan University]. 

By 1994, there were almost no native mussels left in the lake, with zebra now at 3,000+ per square meter. 

“But there was reason for hope,” said Zanatta. “Remnant populations of native mussels were beginning to be found in coastal wetlands in western Lake Erie in the late 1990s.” 

Zanatta’s research adds further evidence that progress continues to be made on one of the impairments of the St. Clair River – the degradation of fish and wildlife habitat – that led to its classification as an environmental Area of Concern in 1985. 

His work also sheds light on the complex ecological impacts of invasive species generally. 

With some environmental observers predicting a doomsday scenario for native game fish if Asian carp are able to establish themselves in the Great Lakes, for example, Zanatta’s mussel research suggests that the outlook for native fish might be significantly more positive than forecasts suggest.

To read the full article, click on the link above. 

**Photo of zebra mussels courtesy of Michigan Sea Grant. 

When researchers and the media talk about Asian carp reaching the Great Lakes, they are typically referring to bighead and silver carp, the two voracious phytoplankton eaters that are wreaking havoc in places like the Mississippi and Illinois rivers. But the species most likely to establish in Lake Erie may actually be a third member of the Asian carp family: grass carp. 

From The Voice: 

“Grass carp are a different kind of fish and pose different kinds of risk than bighead and silver carp,” said Jeff Tyson, administrator of the Lake Erie Fisheries Program Administrator for the Ohio Department of Natural Resources. Tyson addressed a meeting of environmental writers at Ohio State University’s Stone Lab in Lake Erie on Aug. 18. “We know we have some grass carp in the system. Grass carp impact the system through their impacts on structure and vegetation. They consume huge amounts of vegetation.”

Grass carp could put Lake Erie at risk “by damaging habitats and damaging fish in communities given the documented reproduction of grass carp in large rivers,” according to the Ohio Asian Carp Tactical Plan, 2014-2020. “Grass carp can also decimate submersed aquatic vegetation that is critical to migrating waterfowl and other water birds.” Read more. 

**Photo courtesy of Eric Engbretson, US Fish and Wildlife Service, Bugwood.org. 

Researchers at the Chicago Botanic Garden are asking wetland managers across the country to join PhragNet, a collaborative network that brings scientists and managers together to improve Phragmites control strategies. From the latest issue of IISG’s The Helm: 

The idea behind PhragNet is simple. Managers provide soil and plant samples and share information about their management strategies and goals. In return, researchers use that data to better understand Phragmites invasions and help managers hone in on the most effective control and restoration strategies.   

The IISG-funded network is still in its early stages, but PhragNet co-founders Dan Larkin, Jeremie Fant, Vicky Hunt, and others have already collected data from roughly 50 participants in 15 states and Ontario. 

“There is so much we can learn by ‘crowd-sourcing’ information about how to effectively manage Phragmites-impacted wetlands,” said Larkin. “The value will increase over time as we see how sites respond to management.”

“I am constantly looking for workshops, classes, and events that I can attend and bring what I learned back to my class. Each adventure adds to our classroom and allows the students to learn something new. 

I was very excited when I was selected for the B-WET workshop in June of 2013. After the workshop, I added an entire unit on invasive species in the Great Lakes area for the 4th graders and another unit on restoration for the 3rd graders, plus I expanded the watershed unit I was teaching to the third graders. At the end of the units, I invited a guest speaker from the Amboy Marsh, Greg Hunter, to speak to all my classes about the Amboy Marsh and invasive species in our area. We then went to the Amboy Marsh, where the students pulled the invasive Garlic Mustard plant and cleaned away brush. The staff also arranged for guest speakers to talk about turtles, birds, and plants and gave a walking tour of the marsh. My colleagues and I are hoping to continue working with Amboy Marsh when we do our invasive species unit and our restoration unit each year.

The students loved learning about the invasive species! We used the cards from the Sea Grant curricula and played games, such as Beat the Barriers. The students also did research on the various species and used the watch cards. When Mr. Hunter came in to speak, the students had background information on invasive species and were able to connect with what he was discussing.  

This summer, I took part in the NOAA Teacher at Sea Program in the Gulf of Mexico. While on the ship, I worked with NOAA scientists and the crew to learn about the Gulf ecosystems first-hand and watch real science in action. I was on the midnight-to-noon shift for 16 days. We traveled to “stations” across the Gulf where we dropped the trawling net, the bongo nets, and the CTD (conductivity, temperature, and depth) sensors as part of the Groundfish Survey. Once the nets were brought up, we would count, measure, weigh, and record the sex of all the species. Our main objective was to collect information and send it to federal agencies that used it to set the shrimp season and catch limits.

As a result of this experience, I am working on adding more information to our invasive species unit and creating another unit that will have the students trace the water from the Great Lakes watershed to the Gulf of Mexico. We will be following the NOAA Ship Oregon II as they go out for the fall Groundfish Survey and adding that information to the data collected while I was aboard this summer. We will be watching the water’s oxygen levels as the ship travels across the Gulf and will try to figure out what might be the cause of any changes.  

Tying both the B-WET workshop and my experience on a working research ship together will allow the students to see how everyday science is touching our lives.”

“It has been a busy week for me at the AIS office. This summer I am primarily working with fishing tournament organizers and anglers to better understand their attitudes and practices in AIS prevention. Last weekend, I attended my first fishing tournament and had a great time. Although the weather was less than ideal at North Point Marina, Clean Boats Crew and I were able to reach out to the salmon and trout anglers in the Geoffrey Morris Memorial Tournament. Sarah and I attended the rules meeting Friday evening to talk about simple steps tournament anglers can take to prevent the spread of AIS. Then on Saturday I went to the weigh-in to speak with anglers one-on-one and hand out educational material. There were around 70 boats participating in the tournament, with multiple anglers per boat. The audience was receptive and I really enjoyed speaking with them about the importance of AIS prevention. I’ll be attending another tournament in Indiana next weekend, and I’m hoping for nice weather and lots of fish so I can reach as many anglers as possible! Overall I’m really enjoying working with this audience over the summer as I’m getting lots of experience with outreach.”