An endangered species native to San Diego's East County, the arroyo toad, is experiencing a resurgence, thanks to years of research, the effects of storms like Hilary, and a crucial water transfer performed by the Sweetwater Authority. After facing extinction due to ongoing drought conditions in California, this newfound hope sheds light on the potential for habitat rejuvenation and the dedicated work of local agencies and researchers, as reported by NBC San Diego.
Arroyo toads, approximately the size of a penny, depend on water for breeding, making the ongoing drought in California a significant threat to the species' survival. According to The San Diego Union-Tribune, arroyo toads are among a number of key animal species in the region struggling to survive amidst drought, wildfire, invasive plants, and habitat fragmentation; factors equally relevant to the other five key species listed by the article, the Western pond turtle, mountain lion, coastal California gnatcatcher, coastal cactus wren, and Hermes copper butterfly.
To improve the breeding environment and give the arroyo toad a fighting chance, Sweetwater Authority biologists, such as Pete Famolaro, who has studied the species since the 1990s, worked to create optimal conditions in the Sweetwater River watershed near the Loveland Reservoir. A water transfer from the reservoir in November set the stage for a successful breeding season, with additional heavy winter rains subsequently saturating the ground and creating ideal breeding conditions for the arroyo toad. This coordinated effort between Mother Nature and water district management has started to bear fruit, as Dr. Robert Fisher, a biologist with the U.S. Geological Survey – Western Ecological Research Center, collaborated with Famolaro to study the impact.
Though the arroyo toads are not yet in the clear, their numbers have shown promise in the Sweetwater River watershed, giving hope to the species; the largest remaining populations in the United States reside in San Diego County. With arroyo toads' numbers stabilizing, Fisher and Famolaro plan to explore new initiatives and strategies to reestablish their population in areas they formerly inhabited.
