“‘Thus otters serve as biomonitors – organisms that contain information on the quantitative and qualitative aspects of the environment – of wildlife exposure,’ according to a new study. They also serve as biomonitors for human health because the same toxic chemicals found in otters have also been found in people who eat contaminated fish.The study published in the journal ‘Ecotoxicology and Environmental Safety’ found high concentrations of chemical compounds in the livers of 23 otters in central Illinois.Especially troubling were the highest concentrations of dieldrin ever reported in otters anywhere in the United States, said lead author Samantha Carpenter, a wildlife technical assistant at the University of Illinois, Urbana-Champaign.Dieldrin is one of the organochlorine insecticides banned in 1978. More than three decades later, high levels of the chemicals remain in river sediments and accumulate in the fish that otters and people may eat.The compound has been linked to neurological, behavioral and immune-suppression problems in wildlife. Scientific studies disagree on adverse human effects, but some studies have linked dieldrin to asthma, Parkinson’s disease, Alzheimer’s disease and breast cancer, Carpenter said.”
Recent News
- New aquaponics curriculum brings STEM and sustainable agriculture to the classroom
- Illinois-Indiana Sea Grant welcomes new coastal engineering and community resilience specialist
- Meet our Grad Student Scholars: Xiaoli Xing
- IISG accepting applications for 2025 Graduate Scholars
- Illinois-Indiana Sea Grant communications coordinator joins the team
IISG Instagram
Valentine’s Day is almost here, and we’ve got you covered! Share our valentine with the one who makes your heart buoyant! 💌
And catch up on all the latest IISG news at the link in bio.

Join us in welcoming IISG’s new coastal engineering and community resilience specialist, Sarah Peterson! Sarah’s chief responsibility will be to develop a coastal resilience program along the southern Lake Michigan shoreline.
Read more about Sarah and her work at the link in bio.

Attention educators! Only 2 days left to apply!
Got summer plans? The Shipboard Science Workshop takes place each year on one of the Great Lakes, and 2025 is Lake Michigan’s turn! Take advantage of this opportunity to work alongside scientists and fellow-educators aboard the EPA R/V Lake Guardian to engage in real-world research and data collection, enhance your skills, and create innovative lessons.
5-12th grade formal and informal educators from all Great Lakes states are invited to apply for this FREE shipboard workshop sponsored by the EPA Great Lakes National Program Office and facilitated by Great Lakes Sea Grant Network educators
Workshop dates: July 7-13, 2025
Application deadline: Feb. 10.
Learn more at the link in bio.

🚨🚨 New episode alert!🚨🚨 Teach Me About the Great Lakes episode 105 is out!
The nonprofit Freshwater Future has had much success working with local communities toward cleaner, safer drinking water. Jill Ryan, executive director, and Ann Baughman, associate director, patiently play Stuart’s favorite game, counting down the top five threats to our drinking water as they know them. SPOILER ALERT: Two of them surprised Stuart.
Tune in via the link in bio.
