“But what was kind of shocking, and not exactly expected, was that trees, as a group, are more responsive to these temperature shifts than wildflowers,” Heberling said. The new study expands on Heberling’s previous work with Richard Primack, a professor of biology at Boston “We call those phenological mismatches.” Using Thoreau to Determine Changes “But species that aren’t regulated by temperature, or don’t make their decisions based only or solely on temperature cues, are maybe not changing as quickly,” Kuebbing said. The changing of the timing of when these plants are flowering and fruiting affects who eats their seeds, it affects their pollinators. She said global warming is changing the behavior of some species that rely on temperature cues, for example, when the arrival of spring is earlier and warmer than in the past. Gravitational shifts, according to Sara Kuebbing, an assistant professor in the Department of Biological Sciences at the University of Pittsburgh working on the study. Species respond to different temperature and light cues that signal these seasonal changes, or even to Earth’s “Phenology is the timing of biological events or seasonal events that are repeating, and occur year to year, like the arrival of migrating birds back to Pennsylvania, the emergence of butterflies, or the leaf out of trees and wildflowers,” Heberling said. Photo: Kara Holsopple / The Allegheny Front Mismatches in Nature Bloodroot plants collected 100 years apart show that some species are leafing out and blooming earlier than in previous decades. Sara Kuebbing and Mason Heberling with specimens from Carnegie Museum of Natural History’s herbarium collection. Right now, he and collaborators from the University of Pittsburgh and Boston University are at the beginning of a three-year research project, funded by a $645,767 award by the National Science Foundation, to study the impacts of climate change and invasive plants on the phenology of wildflowers and trees. Heberling is the assistant curator of botany at the Carnegie Museum of Natural History in Pittsburgh, and a plant ecologist. “But also, as a researcher studying it, so much stuff is happening right now, it keeps us up at night,” he said. Spring is one of Mason Heberling’s favorite times of the year. And they are back, again, at their field sites, where Claytonia virginica –Virginia spring beauty–has just started to flower. Kuebbing led efforts to bring twigs of native and non-native trees, shrub, and wildflower species into growth chambers at University of Pittsburgh at different time points throughout winter to see what conditions are needed for these species to leaf out and flower.
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