University of Wisconsin–Madison

Tag: Gretchen Hansen

Alumni @ Work: See What Some Recent CFL Grads Were Up To in 2025!

Earlier this fall, we asked some of the Center for Limnology’s alumni from the last several years to send us updates on what they were working on these days. A couple of those updates ended up in our annual newsletter (which you can read here), but we got so many updates, we didn’t have room …

Fish Fry Day Redux: Video of Smallmouth Bass Begging for Samples

While you’d be right in accusing us of “mailing it in” in this week’s version of the “Fishes of Wisconsin” challenge, we’ll make it up to you by presenting not one, but two cool underwater videos of smallmouth bass doing their thing! First up, some smallies in an undisclosed lake in northern Wisconsin keep trying …

“When” – Not Just “Where” – Key Question for Species Abundance

When it comes to studies of species abundance, scientists have spent a lot of time looking into where, exactly, particular plants or animals thrive or survive in a particular ecosystem. But, harnessing the relatively recent rise of long-term datasets, a new study published online in the journal PLOS ONE found that, for some species, it matters …

Are We Thinking About Invasives All Wrong?

FOR IMMEDIATE RELEASE: Contact: Gretchen Hansen, 608.221.6330, Gretchen.Hansen@wisconsin.gov Zebra mussels. Asian carp. Kudzu. Chances are you recognize these names as belonging to invasive species — plants or animals that are relocated from their native habitat to a foreign land, only to prove so prolific that they take over their new home. Except that’s not how …

Slideshow: Sparkling Lake Rebounds from Invasion

A recent study authored by our former postdoc and PhD student, Gretchen Hansen, reports that an intensive invasive-species trapping experiment had paid off for Sparkling Lake in northern Wisconsin. Not only did our researchers put a big dent in the rusty crayfish population but, four years later, they’re still being kept in check naturally. Click …