Phenological shifts keep pace with climate change but are slowing down in a semi-arid grassland community.
Zettlemoyer MA, Lesica P
Phenology
If you track the first blooms of spring wildflowers on your regular hikes, you may already be witnessing this — those early-spring species are flowers are pushing earlier under drought stress, and the window where you'd expect to see them is quietly compressing.
Scientists tracked when 25 types of wildflowers first bloomed in a Montana grassland over 30 years and found they're flowering earlier as it gets warmer and drier. The good news is plants are adjusting to keep pace with climate shifts so far. The concern is that this ability to adjust appears to be slowing down — meaning at some point, the flowers may not be able to keep up.
Key Findings
Across 25 wildflower species studied from 1995–2024, flowering advanced nonlinearly — shifts were faster early in the record and are slowing down over time.
Early-spring flowering species pushed their bloom dates even earlier specifically under drought conditions, a stronger response than seen in late-spring species.
Plants are now flowering with fewer accumulated heat units (growing degree days) and sooner after snowmelt than historically, meaning climate-relevant timing has shifted.
chevron_right Technical Summary
Wildflowers in a Montana grassland are blooming earlier than they used to, and they're keeping up with climate change — but the rate of that shift is slowing down, raising concern about what happens as warming continues.
Abstract Preview
Although many studies document advancing phenology in response to warming, it is challenging to identify which environmental drivers influence phenology and whether phenological shifts suitably tra...
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