karen guzzo at the university of north carolina, thank you so much for joining us. ren: thank you for having me. john: wisconsin is coming back from its worst drought in decades. along with unusually high temperatures, it's affected wildlife in and along the state's rivers. while spring rains ended the drought, recovery in some places has been slow. pbs wisconsin's nathan denzeen tells us about one species that's been hit particularly hard. >> we reached peak drought severity in september of last year. >> it has been a dry few years for wisconsin. >> i started getting lots of phone calls from people saying there are all these mussels that are stranded and dying, what can we do? >> it has had a significant impact on the species we hardly think about. >> i was no longer picking up mussel and placing it gently in the water. i was throwing them. as fast as i could. >> much of southern wisconsin was in a perpetual drought starting in the winter of 2021 through 2024. >> droughts are very stressful to aquatic organisms, as well. >> the director of the wisconsin river allian