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Ploidy race distributions since the Last Glacial Maximum in the North American desert shrub, Larrea tridentata by Kimberly L. Hunter; Julio L. Betancourt; Brett R. Riddle; Thomas R. Van Devender; Kenneth L. Cole; W. Geoffrey Spaulding is a Environmental Science article available to read on EtoBox.

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## Abstract A classic biogeographic pattern is the alignment of diploid, tetraploid and hexaploid races of creosote bush (__Larrea tridentata__) across the Chihuahuan, Sonoran and Mohave Deserts of western North America. We used statistically robust differences in guard cell size of modern plants and fossil leaves from packrat middens to map current and past distributions of these ploidy races since the Last Glacial Maximum (LGM). Glacial/early Holocene (26–10 ^14^C kyr bp or thousands of radiocarbon years before present) populations included diploids along the lower Rio Grande of west Texas, 650 km removed from sympatric diploids and tetraploids in the lower Colorado River Basin of south‐eastern California/south‐western Arizona. Diploids migrated slowly from lower Rio Grande refugia with expansion into the northern Chihuahuan Desert sites forestalled until after ~4.0 ^14^C kyr bp. Tetraploids expanded from the lower Colorado River Basin into the northern limits of the Sonoran Desert in central Arizona by 6.4 ^14^C kyr bp. Hexaploids appeared by 8.5 ^14^C kyr bp in the lower Colorado River Basin, reaching their northernmost limits (~37°N) in the Mohave Desert between 5.6 and 3.9 ^1

Who reads Ploidy race distributions since the Last Glacial Maximum in the North American desert shrub, Larrea tridentata?

Author

Kimberly L. Hunter; Julio L. Betancourt; Brett R. Riddle; Thomas R. Van Devender; Kenneth L. Cole; W. Geoffrey Spaulding

Publisher

Blackwell Publishing; John Wiley and Sons; JSTOR; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley (ISSN 1466-8238)

Published

2001

Language

EN

Field

Environmental Science (Physical Sciences)