The warming climate is endangering the federally threatened Florida scrub-jay, according to a long-term study led by researchers from the Cornell Lab of Ornithology and Archbold Biological Station. Rising winter temperatures have shifted the bird’s nesting patterns, but these changes are exposing nests to greater risks, significantly reducing reproductive success.
The study, published in Ornithological Advances, analyzed 34 years of data from the Archbold Biological Station in Florida, where average winter temperatures have risen by 1.3 degrees Fahrenheit. The research found that Florida scrub-jays are nesting approximately one week earlier than in 1989, inadvertently increasing their vulnerability to predators, particularly snakes.
“There is significantly more snake activity in warmer weather,” said lead author Sahas Barve, director of avian ecology at Archbold. Snake predation has reduced the number of offspring raised annually by the scrub-jays by 34% over the last three decades.
The scrub-jay’s resilience is further tested by the need to repeatedly rebuild nests and lay eggs after predation events. This increased reproductive effort does not lead to more offspring but instead decreases the birds’ long-term survival rates. “There’s a tradeoff between breeding attempts and longevity,” noted John Fitzpatrick, director emeritus of the Cornell Lab of Ornithology. “Over time, this is a troubling trend for the species’ persistence.”
The findings have raised concerns about the future of scrub-jays even in protected areas. Despite habitat management efforts, the species faces mounting challenges due to climate change. “What might be a healthy population today could be struggling in the next 10 to 20 years,” Barve warned.
The Florida scrub-jay, found only in the state’s scrubby flatwoods, is emblematic of the challenges many species face under shifting climate conditions. The study underscores the urgency of integrating climate mitigation strategies into conservation efforts to ensure the survival of species at risk.
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