In June I trekked with a friend to the top of the Sierra El Pinito, a good-sized range just Southeast of Nogales. The Sierra El Pinito nudge their way into the pine forest community at 2230 meters, high enough to compete for serious Sky Island status in Sonora. They are just South of the border from the Santa Ritas and Patagonias on the US side, but because of the the political boundary they are a world away when it comes to fire suppression and natural fire regimes.
To drive the point home the Sierra Azul, just to the south, was actively burning. The fire had burned a significant percentage of the range by the time we laid eyes on it. By the time we left the area it had burned itself out naturally. Little is done to combat wildfires and indeed, in contrast to U.S. fire policy, people don't treat every wildfire as an utterly dire situation.
In my 15 years of experiences in Sonora I’ve seen people with a very different attitude toward fire than I am used to. Little is done to suppress wildfires in Mexico. Fires often burn mountains, grasslands, and even buffelgrass sided freeways, just to burn themselves out without much attention from authorities or locals. Combined with the lack of resources to fight wildfire in Mexico, this has created vegetation communities with a substantially different fire regime than similar communities on the U.S. side of the border.
Some conditions that affect the spread of natural wildfire are unfortunately still present in Sonora, such as cattle grazing and logging. Luckily a few rugged and/or remote locations have even been spared these effects.
This dramatic difference in fire management bisecting the Sky Islands offers an opportunity to study the differences as well as the massive problems associated with fire suppression in Arizona and the West in general.