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Comparing Genetic Diversity in Three Threatened Oaks

Emma SpenceThe Morton Arboretum, Center for Tree Science, 4100 Illinois 53, Lisle, IL 60532, USAJeremie B. FantNegaunee Institute for Plant Conservation Science and Action, Chicago Botanic Garden, 1000 Lake Cook Road, Glencoe, IL 60022, USAOliver GailingCollege of Forest Resources and Environmental Science, Michigan Technological University, 1400 Townsend Dr, Houghton, MI 49931, USAM. Patrick GriffithMontgomery Botanical Center, 11901 Old Cutler Rd, Coral Gables, FL 33156, USAKayri HavensNegaunee Institute for Plant Conservation Science and Action, Chicago Botanic Garden, 1000 Lake Cook Road, Glencoe, IL 60022, USAAndrew L. HippThe Morton Arboretum, Center for Tree Science, 4100 Illinois 53, Lisle, IL 60532, USAPriyanka D. KadavCollege of Forest Resources and Environmental Science, Michigan Technological University, 1400 Townsend Dr, Houghton, MI 49931, USAAndrea T. KramerNegaunee Institute for Plant Conservation Science and Action, Chicago Botanic Garden, 1000 Lake Cook Road, Glencoe, IL 60022, USAPatrick ThompsonDepartment of Biological Sciences, Auburn University Davis Arboretum, Auburn, AL 36849, USARaakel ToppilaLongwood Graduate Program in Public Horticulture, University of Delaware, 181 South College Avenue, Newark, DE 19717-5267, USAMurphy WestwoodThe Morton Arboretum, Center for Tree Science, 4100 Illinois 53, Lisle, IL 60532, USAJordan WoodNegaunee Institute for Plant Conservation Science and Action, Chicago Botanic Garden, 1000 Lake Cook Road, Glencoe, IL 60022, USABethany A. ZumwaldeDepartment of Biology, University of Florida, Gainesville, FL 32611, USASean HobanThe Field Museum Chicago, DNA Discovery Center, 1400 S. Lake Shore Dr, Chicago, IL 60605, USA

2021en

ABI

Annotatsiya

Genetic diversity is a critical resource for species’ survival during times of environmental change. Conserving and sustainably managing genetic diversity requires understanding the distribution and amount of genetic diversity (in situ and ex situ) across multiple species. This paper focuses on three emblematic and IUCN Red List threatened oaks (Quercus, Fagaceae), a highly speciose tree genus that contains numerous rare species and poses challenges for ex situ conservation. We compare the genetic diversity of three rare oak species—Quercus georgiana, Q. oglethorpensis, and Q. boyntonii—to common oaks; investigate the correlation of range size, population size, and the abiotic environment with genetic diversity within and among populations in situ; and test how well genetic diversity preserved in botanic gardens correlates with geographic range size. Our main findings are: (1) these three rare species generally have lower genetic diversity than more abundant oaks; (2) in some cases, small population size and geographic range correlate with genetic diversity and differentiation; and (3) genetic diversity currently protected in botanic gardens is inadequately predicted by geographic range size and number of samples preserved, suggesting non-random sampling of populations for conservation collections. Our results highlight that most populations of these three rare oaks have managed to avoid severe genetic erosion, but their small size will likely necessitate genetic management going forward.

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Identifikatorlar

DOI: 10.3390/f12050561

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