Category: grad research

New paper on plasticity in cottonwood leaf venation and stomatal traits

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Iris Garthwaite, a former Master’s student and NSF GRFP recipient now at the USGS, dug into lab techniques and image analysis for quantifying leaf venation and stomatal traits for her recent paper in Ecology and Evolution: https://doi.org/10.1002/ece3.70683. Along with two former undergraduates in our lab, Catherine Lepp and Zyled Rodriguez, she found clear consequences of these traits for tree growth at the hot edge of Fremont cottonwood’s range:
but also complex patterns of genotype-specific plasticity that are not easily explained by selection in more predictably variable environments:
Her research raises a lot of interesting questions about the consequences of past and future climate variability for evolutionary and ecological responses in riparian forest ecosystems already experiencing major declines!

New paper from lab alum shows the power of hyperspectral data to predict genetic and environmental effects on cottonwood leaves

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Dr. Jackie Corbin, who now works on actually applying restoration principles with NRCS, used hyperspectral reflectance of Fremont cottonwood leaves growing in multiple common gardens and at home to detect genetic, environmental, and gxe effects on spectral traits https://doi.org/10.1111/pce.15263. She showed we can detect a tree’s population of origin with high accuracy, even in a controlled environment, and also that common spectral indicators of photosynthetic capacity decline as trees are planted in hotter temperatures than they have evolved to deal with. Read all about it, open access in Plant, Cell, and Environment.

New paper from lab alum Sarah Sterner!

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With co-advisor Clare Aslan (NAU SES) and co-author Todd Chaudhry (National Park Service), Sarah found that forest management approaches across multiple agencies shapes ecological responses to major wildfires. 

Sterner, S.A.**, C.E. Aslan, R.J. Best, and T. Chaudhry. 2022. Forest management effects on vegetation regeneration after a high severity wildfire: A case study in the southern Cascade range. Forest Ecology and Management 520: 120394. link

Using the Reading Fire as a case study crossing Lassen National Park and Lassen National Forest boundaries, Sarah showed that both management before a fire, such as fire suppression or harvesting, and management after a fire, such as restoration and replanting, shaped the composition and density of forest vegetation. Sarah combined both field surveys and remote sensing to assemble both short and long-term perspectives on fire and forest management, which is increasingly important to understand across the warming American West. You can read her paper here!

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