Climate Lags and Genetics Determine Phenology in Quaking Aspen (Populus tremuloides)
Author ORCID Identifier
Benjamin W. Blonder https://orcid.org/0000-0002-5061-2385
Philip G. Brodrick https://orcid.org/0000-0001-9497-7661
K. Dana Chadwick https://orcid.org/0000-0002-5633-4865
Erin Carroll https://orcid.org/0000-0001-9044-3101
Roxanne M. Cruz-de Hoyos https://orcid.org/0000-0002-4996-6354
Moisés Expósito-Alonso https://orcid.org/0000-0001-5711-0700
Shannon Hateley https://orcid.org/0000-0002-8453-6704
Minkyu Moon https://orcid.org/0000-0003-0268-1834
Courtenay A. Ray https://orcid.org/0000-0002-2276-5915
Hoang Tran https://orcid.org/0000-0002-7768-0863
James A. Walton https://orcid.org/0000-0003-3211-5083
Wiley-Blackwell Publishing Ltd.
- Spatiotemporal patterns of phenology may be affected by mosaics of environmental and genetic variation. Environmental drivers may have temporally lagged impacts, but patterns and mechanisms remain poorly known.
- We combine multiple genomic, remotely sensed, and physically modeled datasets to determine the spatiotemporal patterns and drivers of canopy phenology in quaking aspen, a widespread clonal dioecious tree species with diploid and triploid cytotypes.
- We show that over 391 km2 of southwestern Colorado: greenup date, greendown date, and growing season length very by weeks and differ across sexes, cytotypes, and genotypes; phenology has high phenotypic plasticity and heritabilities of 31-61% (interquartile range); and snowmelt date, soil moisture, and air temperature predict phenology, at temporal lags of up to 3 yr.
- Our study shows that lagged environmental effects are needed to explain phenological variation and that the effect of cytotype on phenology is obscured by its correlation with topography. Phenological patterns are consistent with responses to multiyear accumulation of carbon deficit or hydraulic damage.
Blonder, B. W., P. G. Brodrick, K. D. Chadwick, E. Carroll, R. M. Cruz-de Hoyos, M. Expósito‐Alonso, S. Hateley, M. Moon, C. A. Ray, and H. Tran. 2023. Climate lags and genetics determine phenology in quaking aspen (Populus tremuloides). New Phytologist 238:2313–2328.