ArticleAmerican journal of botany2025
Heat waves decrease fitness and alter maternal provisioning in natural populations of Mimulus guttatus.
Article in American journal of botany, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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Who cites it
3 citing papers in PubMed.
- The incredible vulnerability that reproduction poses for plant species in a warming world.The New phytologist · 2026Review
- Temporal Autocorrelation Increases Temperature-Driven Extinction Risk by Clustering Stressful Conditions.Ecology letters · 2026Article
- Heat waves decrease fitness and alter maternal provisioning in natural populations of Mimulus guttatus.American journal of botany · 2025Article
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Authors and funding
7 authors.
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No grant is acknowledged in the PubMed record.
Abstract
premiseThe increasing frequency and severity of heat waves across the globe is well known. However, few longitudinal studies have tracked demographic change and fitness within natural populations, and fewer still have spanned multiple extreme events. Determining how organisms tolerate, respond, and potentially adapt to extreme events is key for assessing long-term population viability.
methodsWe examined how mortality, fecundity, seed provisioning, and offspring germination differed across 12 populations of annual common monkeyflower (Mimulus guttatus) over 5 years.
resultsTwo heat waves occurred within the study: a heat wave within the first 10 days of the growing season in 2019 and a heat dome event nearly a month into the growing season in 2021. Mortality was high, and fecundity decreased in a population-specific manner following each heat wave. However, the 2021 heat dome caused declines of 34.5% in seed size and 22.1% in the ability to germinate, while the 2019 heat wave did not significantly affect either. Structural equation models indicated that similar climatic factors-including early-season maximum temperatures and late-season precipitation-are associated with declines in fecundity and slower germination.
conclusionsThese results suggest that the consequences of heat waves will depend on the relative severity and timing of the heat wave in the growing season, and further suggest that this timing may have amplified longer-term impacts because offspring have less provisioning. Specifically, with growing seasons shifting earlier into the spring, later or slower germination could exacerbate population extirpation risk.
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