An 18,000-acre wildfire sweeping across Santa Rosa Island has put some of the rarest plants on the planet in jeopardy, even as firefighters race to protect the most vulnerable groves from total destruction.
The southeastern corner of Santa Rosa Island holds a grove of several thousand Torrey pine trees, some exceeding 250 years old. These gnarled conifers exist naturally in only two places on Earth: here and in San Diego County, where they represent a different subspecies. When flames broke out late last week, the immediate concern was whether firefighters could prevent the fire from reaching the grove and extinguishing the island's population entirely.
So far, containment efforts appear to be holding. Despite the fire consuming nearly a third of the island's surface, drone footage this week showed that green canopy remains visible around the Torrey pine grove, offering what officials called "cautious optimism." But scientists caution that the true extent of damage may not be clear for months or even years, as delayed mortality can strike trees long after a burn.
The threat extends beyond the Torrey pines. Santa Rosa Island is home to six plant species found nowhere else on the planet, and ten percent of the island's total flora is classified as rare. A genus of manzanita native to the island may actually thrive after fire, and some other endemics grow in sparse, open terrain less likely to fuel intense flames. But two species have drawn particular concern from researchers: the Torrey pine itself and the East Point dwarf dudleya, a succulent whose entire known range has already been scorched.
"Their response to fire is not known at all," said Steve Junak, a biologist who has studied Channel Islands flora for nearly four decades. "They're only found on a very small area just on the east end of Santa Rosa Island, where this fire has been concentrated. I hope they survive this event."
The soft-leaved Indian paintbrush, a federally endangered herb with yellow flowers, also remains at risk, though its range extends to the northern part of the island, which has not yet burned.
Channel Islands National Park has long been viewed as a conservation triumph. Over recent decades, rare native plants have made a dramatic recovery after more than a century of damage from non-native livestock and introduced wild animals. Today the islands host dozens of endemic species found nowhere else in the world. Wildfires, however, have been virtually absent from the Channel Islands historically, occurring only after rare lightning strikes. Scientists are uncertain whether species that evolved without regular fire exposure have developed the biological defenses to survive a severe burn.
"We're all watching this with a little bit of trepidation," said Dr. Heather Schneider, director of research and conservation at Santa Barbara Botanic Garden. "Are these plants going to recover on their own?"
The cause of the current fire remains under investigation. A 67-year-old sailor crashed his boat onto rocks along the island's shore last week and fired at least two flares to signal passing vessels. Footage obtained by SFGate showed a burning sailboat on the shore, though it remains unclear whether the vessel ignited from impact or was deliberately set alight. The U.S. Coast Guard rescued the sailor unharmed.
If the fire causes severe damage to Santa Rosa Island's endemic plants, restoration may still be possible. Santa Barbara Botanic Garden has spent decades building a seedbank specifically for conservation purposes, including a grove of 40 Torrey pines cultivated for potential restoration efforts.
The ecological damage, however, could extend beyond what appears in the immediate aftermath. Junak noted that the island's rare plants support specialized insects and animals dependent on them for nectar, pollen, and shelter. The fire will also destroy soil crusts composed of lichens, algae, mosses, and liverworts that prevent invasive species from taking hold and reduce erosion during heavy rains.
Author James Rodriguez: "An island that survived a century as a conservation success story now faces its greatest threat in a single week, and we won't know for months whether nature can bounce back on its own."
Comments