They looked for seedlings growing in the examined sites, comparing growth with nearby unburned forests to determine how well forests in each area were able to regenerate.
The team found the proportion of sites in which no post-fire tree regrowth had taken place increased from 19 to 32 per cent when comparing earlier years of the analysis to the more recent years.
Investigators have found a collection of hundreds of photos of women and teenaged boys photographed by Alcala, and speculate that he could be responsible for many more murders in California.
He is also a suspect in at least two unsolved murders in New York.
Scientists have linked changes in temperature, levels of rain and soil moisture - all of which are influenced by global warming - to increased risk of wildfires.
This new study suggests the impact of climate change on wildfires may have longer term consequences as well.
Alcala is also notable for exceptional demonstrations of cruelty: Prosecutors say he "toyed" with his victims, strangling them until they lost consciousness, then waiting until they revived, sometimes repeating this process several times before finally killing them.Education Alcala, who claims to have a "genius-level" IQ, graduated from the UCLA School of Fine Arts after his medical discharge from the Army, and later attended New York University using the alias "John Berger", where he studied film under Roman Polanski.Alcala committed his first known crime in 1968: A motorist in Los Angeles witnessed him luring an eight-year-old girl named Tali Shapiro into his Hollywood apartment and called police.Led by Dr Camille Stevens‐Rumann, an ecologist at Colorado State University, the study involved testing fire-struck areas of forest for signs of regeneration.The scientists examined 1485 sites in the Rocky Mountains, all of which had been affected by fires between 19.