Indirect effects drive evolution
Peer-Reviewed Publication
Updates every hour. Last Updated: 22-Sep-2025 07:11 ET (22-Sep-2025 11:11 GMT/UTC)
Kyoto, Japan -- Periodical cicadas have one of the strangest life cycles in the animal kingdom. The 17-year cicadas spend 99.5% of their lives underground in an undeveloped nymph state, which is the longest strictly regulated juvenile period among insects.
Then in the spring of their 17th year, they simultaneously emerge and the males scream above ground for their four to six week-long adult life. Exactly how these insects are able to control when they mature and emerge has remained a mystery.
The long life cycle of periodical cicadas makes rearing nymphs for study extremely difficult. Recently, however, a collaborative team of researchers from both Japan and the United States, including a team from Kyoto University, was motivated to tackle this conundrum.
Making a smoothie, going for an evening walk, or having empathy for a loved one are all examples of executive functions that are controlled by the brain’s frontal cortex. This area of the brain goes through profound change throughout adolescence, and it is during this time that abnormalities in maturing circuits can set the stage for neurodevelopmental disorders, such as schizophrenia and ADHD. Researchers at the Del Monte Institute for Neuroscience at the University of Rochester have discovered that microglia, the brain’s immune cells, play a key role in how the brain adapts to the changes in this area during adolescence, which may transform how neurodevelopmental disorders are treated during this window and, possibly, into adulthood.
Research published in Proceedings of the National Academy of Sciences confirms that fossilized marine invertebrates serve as a powerful tool for understanding long-term ecological change and informing modern conservation efforts.
A new HIV antiretroviral shows promise as a long-acting, oral prophylactic agent, according to a new study by Izzat Raheem, Tracy Diamond and colleagues from Merck & Co., Inc., Rahway, NJ, USA, published August 26th in the open-access journal PLOS Biology.