Remote Sensing of Cytotype and its Consequences for Canopy Damage in Quaking Aspen
Author ORCID Identifier
Benjamin Blonder https://orcid.org/0000-0002-5061-2385
Philip G. Brodrick https://orcid.org/0000-0001-9497-7661
James A. Walton https://orcid.org/0000-0003-3211-5083
Catherine Dana Chadwick https://orcid.org/0000-0002-5633-4865
Ian K. Breckheimer https://orcid.org/0000-0002-4698-977X
Courtenay A. Ray https://orcid.org/0000-0002-2276-5915
Karen E. Mock https://orcid.org/0000-0002-8357-4434
Global Change Biology
Wiley-Blackwell Publishing Ltd.
Mapping geographic mosaics of genetic variation and their consequences via genotype x environment interactions at large extents and high resolution has been limited by the scalability of DNA sequencing. Here, we address this challenge for cytotype (chromosome copy number) variation in quaking aspen, a drought-impacted foundation tree species. We integrate airborne imaging spectroscopy data with ground-based DNA sequencing data and canopy damage data in 391 km2 of southwestern Colorado. We show that (1) aspen cover and cytotype can be remotely sensed at 1 m spatial resolution, (2) the geographic mosaic of cytotypes is heterogeneous and interdigitated, (3) triploids have higher leaf nitrogen, canopy water content, and carbon isotope shifts (δ13C) than diploids, and (4) canopy damage varies among cytotypes and depends on interactions with topography, canopy height, and trait variables. Triploids are at higher risk in hotter and drier conditions.
Blonder, B., P. G. Brodrick, J. A. Walton, K. D. Chadwick, I. K. Breckheimer, S. Marchetti, C. A. Ray, and K. Mock. 2022. Remote sensing of cytotype and its consequences for canopy damage in quaking aspen. Global Change Biology https://doi.org/10.1111/gcb.16064