No one would have suspected it in the 1970s, but it turns out that stories about Norwegian bachelor farmers, mock ads for the American Duct Tape Council and musical sets mashing together bluegrass and bossa nova have staying power. When writer and radio host Garrison Keillor and the cast of “A Prairie Home Companion” return to the Hollywood Bowl in Los Angeles on Friday night, it will be with a commitment to keep the indomitable act going, albeit with the recognition that the time for changing ringleaders might not be far off. “We are a variety show, an absolute variety show,” Keillor said. “On a good night on our show, opera can meet jazz can meet bluegrass can meet comedy can meet stories. I just think it’s a natural for radio.” The fate of public radio’s most venerable personalities became a hot topic in recent weeks, with the announcement that original episodes of “Car Talk” with car repair yucksters Tom and Ray Magliozzi would end this fall. But among the possible next-generation breakouts for public radio are comedian Marc Maron’s interview and commentary show, the NPR quiz show “Ask Me Another,” “The Moth Radio Hour,” and Alec Baldwin’s interview program. … A tiny blood-sucking parasite that infests fish on Caribbean coral reefs has been named after Jamaican reggae icon Bob Marley. Arkansas State University marine biologist Paul Sikkel discovered the parasite off the U.S. Virgin Islands a decade ago but it was only recently unveiled as “Gnathia marleyi” as an homage to the singer, who died in 1981. The National Science Foundation says the creature is a new species within the family of gnathiids, parasites commonly found on coral reefs that are ecologically similar to ticks on land. Celebrities such as comedian Stephen Colbert and singer Beyonce have had creatures named after them.