As part of the state’s ongoing commitment to reduce nutrient losses, the directors of the Illinois Department of Agriculture (IDOA) and Illinois Environmental Protection Agency (EPA) announced the release of the state’s second Nutrient Loss Reduction Strategy Biennial Report. This report describes actions taken in the state during the last two years to reduce nutrient losses and influence positive changes in nutrient loads over time.

The Illinois Nutrient Loss Reduction Strategy (NLRS) is one of many state strategies developed and implemented over the 31-state Mississippi River basin that are intended to improve water quality. Illinois’ strategy provides a framework for reducing both point and non-point nutrient losses to improve the state’s overall water quality, as well as that of water leaving Illinois and making its way down the Mississippi River into the Gulf of Mexico.

“The report illustrates all facets of agriculture coming together to promote best management practices,” said John Sullivan, IDOA director. “The next step is transitioning more farmers from awareness of nutrient loss practices to application.”

“The 2019 biennial report describes some the dramatic reductions in total phosphorus discharges from some of the largest wastewater treatment facilities in the state,” said Illinois EPA director John Kim. “We’ve already nearly met one of our 2025 goals of 25% reduction of phosphorus from the point source sector, and we look forward to continued nutrient reductions.”

These reductions are a direct result of investments by wastewater treatment facilities to meet more stringent nutrient permit limits. Illinois officials expect to see continued progress in meeting long-term goals as additional planned wastewater treatment facility upgrades occur.

Illinois NLRS was first released in 2015 with the long-term goal of reducing nitrogen and phosphorus in Illinois waterways by 45%. Interim goals include reducing the amount of phosphorus by 25% and nitrogen by 15% by 2025.

Implementation efforts are led by strategy partners in the Policy Working Group and other sector committees, guided by IDOA and Illinois EPA, with assistance provided by University of Illinois Extension. Illinois NLRS is part of a broader effort being implemented by states in the Mississippi River basin to reduce the amount of nutrients entering the Gulf of Mexico, which causes a “dead zone” of oxygen-depleted water.

Illinois-Indiana Sea Grant (IISG), working closely with IDOA, Illinois EPA, University of Illinois Extension and other partners, developed and produced the biennial report. Eliana Brown, IISG stormwater specialist, led the effort throughout. 

Illinois-Indiana Sea Grant is a part of University of Illinois Extension and Purdue Extension.

This article is based on a press release from IDOA and Illinois EPA. Contacts are Krista Lisser (217)558-1546 and Kim Biggs (217)558-1536.

I am happy to announce the publication of Illinois-Indiana Sea Grant’s (IISG) latest impacts in Illinois, Indiana, and the Great Lakes region. This booklet provides an opportunity to raise awareness of critical coastal issues, proudly share our success stories, and thank our partners. 

While the impacts reported in this publication by no means encompass all of our efforts, they do provide insight into many of the activities and issues we focus on. Impacts include training communities to address flooding concerns through green infrastructure, informing the decision process to deal with the threat of aquatic invasive plants in Illinois, Indiana and beyond, and having a positive influence on the careers of researchers and their students. We also helped inform natural resource planning on the community and regional scale, supported local efforts to dispose of medicine safely, and through workshops and other support, helped educators bring aquatic and Great Lakes science to their classrooms.

Through the dedication and creativity of IISG staff members, as well as support from our many partners who provided funding, networks, expertise, and other resources, IISG is able to make a difference in the Great Lakes region, particularly in Illinois and Indiana.

I would also like to take a moment to share some IISG staff changes. Our program aims to address topics that are highly relevant for Illinois and Indiana, while also ensuring that our activities align with National Sea Grant and NOAA-wide initiatives. As priorities evolve both locally and nationally, so does our program.

Over the past several years, the National Sea Grant Office has increased investments to enhance aquaculture production and improve marketing and economic opportunities related to fish farming. This national focus on domestic aquaculture is due in part to the need to make up for the global exploitation of wild fish stocks, as well as the US’s large trade-deficit for fish and seafood products. Our area of the country is a huge food producer, and we believe there is now a great opportunity to also grow fish production here.

Aquaculture has long been a focus of IISG, going back several decades. Since 2006, Kwamena Quagrainie has been our aquaculture marketing specialist, working closely with producers to improve production and tap into new markets. Now, Amy Shambach has joined the team as the program’s aquaculture marketing outreach associate. In this new position, co-funded by the North Central Regional Aquaculture Center, she will help investigate consumer-side demand for food-fish aquaculture throughout the Midwest. Amy’s work will contribute to the new Great Lakes Aquaculture Collaborative, helping to inform producers as well as future research.

As we welcome new Sea Granters, we also must say farewell to those who have moved on to other endeavors. Thank you to Yu-Feng Lin who served as IISG’s associate director since late 2017. Yu-Feng provided administrative oversight for the University of Illinois side of the program. He will now be focusing on his other duties, serving as principal research hydrogeologist with the Illinois State Geological Survey and director of the Illinois Water Resources Center. Until a new permanent associate director is named, Pat Charlebois, IISG’s outreach program leader, is serving in this role.

Tomas Höök
Director, Illinois-Indiana Sea Grant

Illinois-Indiana Sea Grant is a part of University of Illinois Extension and Purdue Extension.

Six Great Lakes Sea Grant programs have been awarded $1 million to work together on a three-year project to increase aquaculture production and sales in the region.

The Great Lakes Aquaculture Collaborative is one of 42 research projects and collaborative programs totaling $16 million aimed at advancing sustainable aquaculture in the United States funded by the National Sea Grant Office. The awards are dependent on the availability of federal funds.

Despite the fact that the Great Lakes comprise one of world’s largest freshwater ecosystems, aquaculture production in the region is failing to keep pace with increases in consumer demand for fish and seafood. This contributes to a national seafood trade deficit of $14 billion, second only to oil in the ranking of natural resource trade deficits. 

“Through the Great Lakes Aquaculture Collaborative, our goal is to lay the foundation for an environmentally responsible, competitive and sustainable aquaculture industry,” said Stuart Carlton, IISG assistant director. “And from the consumer perspective, to provide more opportunities to buy locally raised protein in the form of farm-raised fish.”

Minnesota Sea Grant will lead the collaborative, and for its part, Illinois-Indiana Sea Grant (IISG) will explore perceived barriers to successful aquaculture operations in the Great Lakes region. Amy Shambach, IISG aquaculture marketing outreach associate, will interview producers, food distributors, grocers, restauranteurs and other key players to provide insights that inform efforts to improve aquaculture production and marketing.

“It is vital to the growth of the aquaculture industry in the Great Lakes region to not only assess the industry’s needs but to then get that information into the hands of farmers,” said Shambach.

The Great Lakes Aquaculture Collaborative is funded by National Sea Grant’s Advanced Aquaculture Collaborative Program. This program seeks to build the capacity of Sea Grant and its partners to advance aquaculture in areas where a foundation of knowledge and activity currently exists but where significant barriers to sustainable domestic marine and Great Lakes aquaculture remain.

“These investments are critical to advancing United States aquaculture in sustainable, thoughtful ways using the best science and talent across the country,” said National Sea Grant Director Jonathan Pennock. “With our 2019 investments, we can address critical gaps in information, understanding and connectivity of science to industry.”

IISG was also awarded a second grant to study challenges to raising walleye in aquaculture production. “Walleye has a local identity—it has a strong association with the Midwest, is available in restaurants as a commercially caught species, and may be suitable for aquaculture,” said Kwamena Quagrainie, IISG aquaculture marketing specialist.

Currently farm-raised walleye in Illinois and Indiana is minimal. Quagrainie, along with Carlton and Purdue University researchers Robert Rode and Joseph Balagtas, are leading a working group that aims to understand the business and real-world production barriers to raising these fish in an economically sustainable manner. National Sea Grant awarded them $96,000 to find answers.

“There is reason to believe that walleye aquaculture could be a boon in the two states, but a lot of background work needs to be done to see if it is even feasible,” added Quagrainie.

Illinois-Indiana Sea Grant is a part of University of Illinois Extension and Purdue Extension.

Life on Earth is dependent on microbes to create the air we breathe and transform nutrients. This is of course true for Great Lakes ecosystems, but previously, no comprehensive research has looked at what microbial populations are in these waters.

Now, University of Chicago researchers are the first to systematically identify the species and abundance of viruses, bacteria and other microscopic life in all five Laurentian Great Lakes.

Maureen Coleman and members of her lab have been collecting samples aboard Great Lakes research vessels since 2012. In 2015, Illinois-Indiana Sea Grant began supporting their work to build a baseline understanding of microbial communities. Now, the team, which includes Sara Paver, Justin Podowski and María Hernández-Limón, have been awarded a grant from the National Science Foundation to continue their studies.

“The primary pattern we found is that microbes differ with depth,” said Coleman. “When the lakes are stratified in the summer, the surface heats up and the bottom stays cool. At that point, we see very different communities in the surface and the deep water. It’s driven by temperature and light, probably.”

The microbial communities on the surface are different in the upper lakes—Superior, Michigan and Huron—than the lower lakes—Erie and Ontario. “This makes sense because the upper and lower Great Lakes diverge physically and chemically,” said Coleman.  “In addition to temperature, nitrogen, phosphorus and chlorophyll levels are different between the upper and lower lakes. The microbes respond to that.”

Tony Briscoe, environmental reporter with the Chicago Tribune, has more of the story: “Minuscule microbes wield enormous power over the Great Lakes. But many species remain a mystery.”

Writer: Irene Miles, 217.333.8055, miles@illinois.edu

Flash flooding can happen quickly, potentially disrupting emergency access, transportation and other everyday activities—not to mention, posing a threat to life and property. But, if weather predictions can pinpoint locations at higher risk, emergency managers and residents alike may be more prepared to heed flash flood warnings.

Illinois-Indiana Sea Grant and Wisconsin Sea Grant funded researchers Beth Hall and Paul Roebber to develop models that can help identify sites at highest risk of flooding from heavy rainfall in the Chicago/Romeoville and Milwaukee/Sullivan National Weather Service (NWS) regions. The two scientists created tools that take historical data into account, in addition to atmospheric signals associated with flooding events.

Roebber, an atmospheric scientist at the University of Wisconsin Milwaukee, focused his efforts on improving meteorological forecasting. “We’re using modern machine-learning approaches to figure out how we can identify and then put together the best factors that allow for better prediction,” he said.

He explained some of the factors and challenges. “For example, you might have a series of thunderstorms that are moving over the same area—that’s called training convection—and it’s a pretty common way for flood events to happen. Particular meteorological conditions encourage those kinds of events to occur, but it’s very difficult to pinpoint exactly where that is and the precise timing.”

At the Midwestern Regional Climate Center (MRCC) at the University of Illinois, Hall and her team tackled this project on two fronts. First, they developed a map that considered relatively unchanging factors such as land cover, slope, population or type of vegetation, highlighting areas that historically produced flash flood reports due to extreme precipitation.

“We found the strongest correlation when we divided land surfaces into whether they absorb water or they don’t—in other words, impenetrable surfaces,” said Hall, who is now at Purdue University.

Hall’s team relied on flash flooding data in NWS Local Storm Reports for this study. These are official reports, covering a 4-kilometer or 2.5-mile square area, sent to local offices or the NWS Storm Prediction Center. “We chose not to include basement flooding or insurance reports because we didn’t want socio-economics to be a factor,” said Hall. “We wanted as much as possible for it to be an independent and unbiased historical dataset.”

(Center for Neighborhood Technology Photo)

Acknowledging the downside of this measure—that not all flash flooding is reported to NWS, Hall explained, “We understand that what we are assessing, in fact, is the risk of a flash flood report.”

Using reported flash flood events between April and October from 2002-17, Hall’s team created an artificial intelligence model that incorporates previous rainfall into the risk assessment. They created algorithms on historical precipitation data as well as the timing and location of a flash flooding report.

Specifically, the model considers how much rain fell in the six days prior to when a flash flood was reported compared to six days of precipitation that did not lead to a flash flood report. The researchers were looking at the effect of ground that may be saturated from previous rainfall.

“This flash flood risk-potential project developed by the Midwest Regional Climate Center is an intriguing and novel way to look at flash flood prediction,” said Scott Lincoln, senior service hydrologist with the Chicago NWS.

“Our typical methods for predicting flash floods either use models of water moving over the land surface or comparisons of rainfall rate to a predetermined threshold. This method, instead, looks at the problem in reverse—known reports of flash flooding are evaluated to find the soil conditions and rainfall rates that made the flooding more likely.”

The Chicago NWS office is adding Hall’s model to its spring hydrology training program so it can be evaluated later this year during actual heavy rainfall events. “Having multiple methods of monitoring potential flash flooding can increase forecasters’ confidence in determining whether a warning is needed,” said Lincoln.

Roebber summed up the larger goal of this Sea Grant project. “For the general public, it’s just better information. When you hear a weather warning, you’re going to pay more attention if it tends to verify. There will be fewer false alarms and better information to act on.”

For more information on this project and to see flash flood report maps for the region, visit the MRCC website.

In 2020, Lake Michigan will be the focus of intense research and monitoring through the Cooperative Science and Monitoring Initiative (CSMI), which brings together federal, state and university scientists each year on one of the Great Lakes. In preparation for Lake Michigan’s next field year, scientists, resource managers and others came together in Milwaukee last fall to begin discussing priorities and defining critical information gaps.

CSMI is a binational program organized through the U.S. Environmental Protection Agency Great Lakes National Program Office and Environment and Climate Change Canada. The International Joint Commission and Illinois-Indiana Sea Grant sponsored the October meeting.

At the University of Wisconsin-Milwaukee School of Freshwater Sciences, 60 scientists and resource managers met for two days to share their knowledge and perspectives and learn from each other. The conversation began with a review of main findings from previous Lake Michigan research, including results from the 2015 CSMI intensive sampling effort, which focused on learning more about:

• Nearshore conditions and the movement of nutrients and organisms offshore.
• The effect of nutrient loading on water quality.
• The health and status of the lake’s lower food web.
• The movement of contaminants through the food web.

With everyone up to date, the focus turned to 2020. Through lightning talks and breakout discussions, participants hashed out pressing issues and essential data needs, as well as how best to support lake management efforts.

“As they talked through study ideas, the participants identified entities that would be engaged with the work, identified resource requirements including funding and equipment, and linked the proposed study to monitoring needs,” said Paris Collingsworth, IISG Great Lakes ecosystem specialist.

Ultimately, the Lakewide Action and Management Plan (LAMP) for Lake Michigan partnership working group will set the official lake priorities after considering these expert opinions from scientists working around the lake, prior research results, and their own management needs. LAMPs are action plans for restoring and protecting the Great Lakes ecosystem and the LAMP working group includes representatives from federal and state agencies, as well as tribes.

While the group developed a number of potential research priorities over the two days, they also compiled a list of some over-arching recommendations for CSMI work. Some of these are: work to achieve a balance between exploring new topics and maintaining consistent, long-term monitoring programs; involve community (or citizen) science efforts as a way to supplement CSMI sampling; identify a central location for Lake Michigan scientists to share data and discuss sampling and analysis plans; and add sampling in winter and early spring.

Scientists and resource managers met in Milwaukee, WI last fall to discuss Lake Michigan priorities. (Illinois-Indiana Sea Grant Photo/Irene Miles)

To read the workshop report, visit IISG publication resources. 

“While primarily written to help the Lake Michigan LAMP partners as they set research priorities for the 2020 intensive field year, we hope this summary can be useful to any researcher or entity interested in studying Lake Michigan,” said Carolyn Foley, IISG research coordinator.

To learn about 2015 CSMI Lake Michigan results, see our Newsroom story, which provides a link to the full white paper.

Waterways along Midwestern farmlands are typically managed to move stormwater away from crop fields quickly, but this efficient process can wash nutrients and sediment into lakes and rivers, nearby and downstream. Illinois-Indiana Sea Grant researchers have found that a change in waterway management practices can lead to a win-win—water is still quickly drained from crops with two-stage ditches, but because they have more floodplain area, stormwater slows down so more nitrogen is retained along the way.

Sara McMillan at Purdue University and Jennifer Tank at University of Notre Dame are monitoring nitrogen and phosphorus loads coming from two-stage ditches in farmland waterways to document how effective restored floodplains are at holding nutrients in place. “By restoring mini-floodplains on each side of these formerly channelized ditches, you add the potential for enhanced biology and hydrology to cleanse the water through nutrient and sediment removal,” said Tank, whose primary work is in ecology and environmental biology.

“Floodplains provide a way for water to spread out and slow down—allowing sediment to accumulate and plants and soil microbes to thrive. When plants thrive, this allows organic matter in the soil to increase,” said McMillan. In this environment, microbes use nitrogen for energy, removing it from the water as they transform it into a gas—a process called denitrification.

(Graphic courtesy of Brittany Hanrahan)

Brittany Hanrahan, whose doctoral research at Notre Dame was a part of this study, compared the effectiveness of reducing nitrogen in two-stage ditches with waterways in which traditional channelization management has stopped for at least a decade. Over time, these channels in northern Indiana developed mini-floodplains and began to look like more natural streams. The two-stage ditches in the study were about 10 years old.

Hanrahan, who now has a postdoctoral position with the USDA Agricultural Research Service, found that denitrification was 30 percent higher along two-stage floodplains compared to the naturalized ones. The two-stage ditches have more floodplain area than the naturalized channels and are designed to flood more often, which allows denitrification to happen more frequently.

“We calculated that it would take nearly 30 years for the floodplain in the naturalized ditch to accumulate the surface area of floodplain that is constructed in just one day in the two-stage ditch,” said Hanrahan. “Jump-starting the biology with two-stage construction really helps to remove more nitrogen even immediately after construction.”

While slowing down floodwater is conducive to denitrification, phosphorus goes through a different biological process. In fact, if floodwater stands long enough, phosphorus may be released from particles in the soil and water. On the other hand, creating space for water to spread out and slow down can enhance the settling of sediment particles with phosphorus attached.

The design of the two-stage ditch, including the height and width of the floodplain, can make a difference in terms of flooding frequency and duration. One general practice, according to McMillan, is to triple the width of the channel—if it is a 10-foot wide channel, 10 feet are added on either side so it is 30 feet wide.

“We’re pretty confident from previous research that it takes a long time for phosphorus to be released, so it’s not likely that we’re causing a net release of phosphorus that is stored in soils,” said McMillan, who is in Purdue’s Department of Agricultural and Biological Engineering. “While we think that these ditches pose a net benefit for both phosphorus and nitrogen, phosphorus is indeed more complicated.”

Most two-stage ditches can be found in Indiana, which may be because the USDA Environmental Quality Incentives Program covers the majority of the cost of installing them in the state. It’s a one-time construction cost, whereas dredging to maintain trapezoidal channels needs to happen every few years, depending on the system. “With a two-stage ditch, the velocities in the main channel, which is the original channel, are fast enough during high flows that it is always self-cleaning,” said Tank. “You never have to dredge again.”

Every five years, Lake Michigan is the focus of intense research and monitoring when scientists come together to answer critical questions and fill information gaps. A report summarizing the results of the 2015 data collection on the lake is now available.

Each year since 2002, through the Cooperative Science Monitoring Initiative (CSMI), multiple federal, state, and university scientists gather on one of the Great Lakes to take part in coordinated research. CSMI is a binational program organized through the U.S. Environmental Protection Agency Great Lakes National Program Office and Environment and Climate Change Canada.

“CSMI provides an ideal opportunity for scientists to work collaboratively to tackle complex questions in the Great Lakes,” said David “Bo” Bunnell, a researcher with U.S. Geological Survey. “For example, to understand whether changes in plankton are affecting larval fish, given the size of Lake Michigan and the frequency of sampling required, collaboration among agencies offers the best opportunity to enhance our knowledge and inform managers.”

In recent years, Paris Collingsworth, Illinois-Indiana Sea Grant Great Lakes ecosystem specialist and Purdue University researcher, has provided leadership in collaboration with EPA scientists, defining critical questions and coordinating research efforts of various agencies for large-scale studies. He works with the lake partnerships for each lake as they define research priorities, and with scientists as they set up studies and analyze data. He is also helping coordinate Great Lakes Sea Grant programs to develop CSMI outreach products to share research results.

The 2015 Lake Michigan field-year priorities included learning more about the nearshore conditions and the movement of nutrients and organisms offshore, the effect of nutrient loading on water quality, the health and status of the lake’s lower food web, and the movement of contaminants through the food web.

Quagga mussels featured prominently in the key findings of the compiled research results. The researchers found that in mid-depth regions of the lake, where most of these invasive mussels are, their numbers have declined, but their biomass has increased—the mussels are getting bigger. Meanwhile, in deeper parts of the lake, quagga mussel populations continue to expand.

“As quagga mussels filter water, they remove nutrients, bacteria and phytoplankton from the lake, which means that resources at the base of the food web that would have been available under pre-invasion conditions are now bound up in the quagga mussel,” said Collingsworth. “Quantifying the effects of these mussels on energy flow throughout the lake is an important concern for the management community of Lake Michigan.”

In the open waters of the lake, studies revealed that larval fish are growing about half as fast as they did before quagga mussels were established in the early 2000s. In fact, fish data suggest that nearshore areas, and potentially the entire Lake Michigan ecosystem, may not have a sustainable food supply.

The news is better from studies on contaminant levels. The results suggest that efforts to reduce contaminants in Lake Michigan are meeting or exceeding their goals. For example, scientists looked at concentrations of atrazine, a herbicide commonly used in agriculture, and PCBs, a group of industrial chemical banned since 1979, but still present in the lake. In monitored locations, they both are declining faster than predicted.

The CSMI monitoring on Lake Michigan also provided an opportunity to use advances in technology to answer complicated questions. For many decades, devices known as Ponar dredges have been lowered to the lake bottom at a series of single points to capture and bring up bottom-dwelling animals. In 2015, this work was supplemented with a camera attached to a benthic sled that recorded video of the lake bottom.

“The traditional method is still necessary to examine individual animals to learn how they are growing, or the makeup of their DNA,” said Carolyn Foley, IISG research coordinator. “However, the sled sampling gives a much broader picture of exactly where animals are, and in what numbers. Using both sampling techniques can help scientists get a much better picture of exactly what is happening 60 to 900 feet below the surface of Lake Michigan.”

As the CSMI cycle continues, planning has begun for the 2020 Lake Michigan field season. To begin this process, in October, about 60 Lake Michigan federal, state, university and tribal scientists as well as managers met in Milwaukee, Wisconsin to reflect on past research outcomes, explore scientific gaps, and suggest future research areas. The workshop was facilitated by IISG and sponsored by the International Joint Commission.

You can find the CSMI 2015 Lake Michigan Report, including the executive summary and the compendium of research project results, on the IISG website. IISG specialists are also creating an Esri Story Map, which will use an interactive approach to describe the research results.

A collaborative research project about the impacts of quagga mussels in Lake Michigan has led to more funding for the issue from the National Science Foundation (NSF). The original project, jointly supported by the Illinois-Indiana and Wisconsin Sea Grant programs, looked at the effects of this invasive mussel in the deep parts of Lake Michigan on plankton abundance, the phosphorus cycle, and water movement.

Harvey Bootsma

The new project is funded by the Biological Oceanography and Physical Oceanography divisions of NSF for more than $1 million with the expectation that the results will be useful in understanding conditions in other large lakes as well coastal areas.

The principal investigators are Harvey Bootsma and Qian Liao with the University of Wisconsin-Milwaukee,

and Cary Troy with Purdue University. David Cannon is a Ph.D. student working on the project at Purdue.

In the original project, the team discovered that quagga mussels in Lake Michigan are eating more plankton than what is reaching them by sinking from above. They’ll be looking at how and why this could happen with the new project.

“We think that food delivery to the bottom of the lake is not just determined by the passive settling of phytoplankton as it’s sinking through the water, but that

Cary Troy

plankton is always being circulated in the lake,” said Bootsma. “It’s like the plankton are on a kind of conveyor belt where they’re going up and down.”

The researchers now will be studying turbulence in the entire water column.

Troy studied the impact mussels have on water movement as they filter it—sucking in water and spitting it

out. “Although this filtering has a dramatic effect on water quality, we found that quaggas do not strongly influence movement throughout the entire water column,” explained Cannon.

But the movement they cause in the thin layer immediately above the lake bed—a

Qian Liao

phenomenon consistent throughout the year thanks to stable temperatures at the bottom of Lake Michigan—is an element missing from most mussel filtration models.

The researchers also found that the mussels are changing the phosphorus cycle in the lake. “The nutrient-loading models used to set limits for phosphorus aren’t accurate anymore because of these new components to the ecosystem – bottom-dwelling filter feeders,” Bootsma said. “They have changed the rules for how Lake Michigan works.

David Cannon

“Lake managers have a conundrum right now. They’ve got too much algae in the nearshore zone and they want to reduce phosphorus to solve that problem. But there’s not enough phytoplankton in the offshore zone because of the mussels. So if they reduce phosphorus loading in the lake, they could make that offshore problem even worse so that there’s virtually no food left out there for the rest of the food web,” Bootsma said.

With the new project, Bootsma said his team hopes to determine what the “sweet spot” is for phosphorus loading. “There may not be one perfect phosphorus load that solves both the nearshore and offshore problem, but we’d like to try and find one that minimizes the nuisance algae while at the same time keeps the offshore animals alive with enough plankton production.”

The NSF project will start this spring. “Although we’re focusing on Lake Michigan, the work has implications for most of the other Great Lakes as well as other lakes in general that are being invaded by mussels,” Bootsma said. “We’re looking at a fundamental change in the way lakes work, and that’s the kind of thing the NSF is interested in.”

“It’s generally accepted that the ecosystems of smaller, shallower lakes—Lake Erie, for example—are at the greatest risk of quagga mussel invasion,” Cannon added. “Our results could help show other researchers that the effects of mussels on large, deep lakes cannot be ignored and, more importantly, how they can be accounted for.”

Irene Miles, IISG coordinator of strategic communication, contributed to this post.

Illinois-Indiana Sea Grant is a part of University of Illinois Extension and Purdue University Extension.