Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1111/jbi.12337 |
Evidence against a Pleistocene desert refugium in the Lower Colorado River Basin | |
Holmgren, Camille A.1; Betancourt, Julio L.2; Cristina Penalba, M.3; Delgadillo, Jose4; Zuravnsky, Kristin5; Hunter, Kimberly L.5; Rylander, Kate A.6; Weiss, Jeremy L.7 | |
通讯作者 | Holmgren, Camille A. |
来源期刊 | JOURNAL OF BIOGEOGRAPHY
![]() |
ISSN | 0305-0270 |
EISSN | 1365-2699 |
出版年 | 2014 |
卷号 | 41期号:9页码:1769-1780 |
英文摘要 | Aim The absence of Sonoran Desert plants in late Pleistocene-aged packrat middens has led to speculation that they survived glacial episodes either in refugia as intact associations (Clementsian community concept) or in dry microsites within chaparral or woodland according to individualistic species responses (Gleasonian community concept). To test these hypotheses, we developed a midden record from one likely refugium in north-eastern Baja California, Mexico. We also measured stomatal guard cell size in fossil leaves to further evaluate site-level individualistic responses of Larrea tridentata (creosote bush) ploidy races to climatic changes, including monsoonal history, over the late Quaternary. Location Sierra Juarez, Lower Colorado River Basin, north-eastern Baja California, Mexico. Methods Packrat (Neotoma) middens were collected from < 300 m elevation on the eastern piedmont of the Sierra Juarez. Plant macrofossils and pollen were analysed from 50 dated middens, including determination of Larrea tridentata ploidy races. Results Pleistocene middens dating back to > 55,000 cal. yr bp contained a mix of extralocal species characteristic of chaparral and pinyon-juniper-oak woodland, along with some modern desert elements. Many other desert taxa were absent during the Pleistocene, although most had arrived by the beginning of the Holocene 11,700 years ago. Main conclusions The assemblage of chaparral, woodland and select desert elements refutes the hypothesis that the Lower Colorado River Basin served as a late Pleistocene refugium for Sonoran Desert flora. The rapid arrival of most missing desert species by the early Holocene suggests they did not have far to migrate. They probably survived the last glacial period as smaller, disparate populations in dry microsites within chaparral and pinyon-juniper-oak woodlands. Diploid and tetraploid races of Larrea tridentata were present during the Pleistocene, but hexaploids did not appear until the mid-Holocene. This demonstrates that individualistic responses to climate involved genetic variants, in this case cytotypes, and not just species. |
英文关键词 | Baja California glacial refugium Juniperus californica Larrea tridentata Mexico Neotoma packrat middens Sonoran Desert |
类型 | Article |
语种 | 英语 |
国家 | USA ; Mexico |
收录类别 | SCI-E |
WOS记录号 | WOS:000342055900013 |
WOS关键词 | FLOWERING PLANTS ; UNITED-STATES ; NORTH ; POLYPLOIDY ; CALIFORNIA ; EVOLUTION ; RAINFALL ; HISTORY ; CLIMATE ; TIME |
WOS类目 | Ecology ; Geography, Physical |
WOS研究方向 | Environmental Sciences & Ecology ; Physical Geography |
来源机构 | University of Arizona ; United States Geological Survey |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/183131 |
作者单位 | 1.SUNY Coll Buffalo, Dept Geog & Planning, Buffalo, NY 14222 USA; 2.US Geol Survey, Reston, VA 20192 USA; 3.Univ Sonora, Dept Invest Cient & Tecnol, Hermosillo 83000, Sonora, Mexico; 4.Univ Autonoma Baja California, Fac Ciencias, Ensenada, Baja California, Mexico; 5.Salisbury Univ, Dept Biol Sci, Salisbury, MD 21830 USA; 6.US Geol Survey, Tucson, AZ 85719 USA; 7.Univ Arizona, Dept Geosci, Tucson, AZ 85721 USA |
推荐引用方式 GB/T 7714 | Holmgren, Camille A.,Betancourt, Julio L.,Cristina Penalba, M.,et al. Evidence against a Pleistocene desert refugium in the Lower Colorado River Basin[J]. University of Arizona, United States Geological Survey,2014,41(9):1769-1780. |
APA | Holmgren, Camille A..,Betancourt, Julio L..,Cristina Penalba, M..,Delgadillo, Jose.,Zuravnsky, Kristin.,...&Weiss, Jeremy L..(2014).Evidence against a Pleistocene desert refugium in the Lower Colorado River Basin.JOURNAL OF BIOGEOGRAPHY,41(9),1769-1780. |
MLA | Holmgren, Camille A.,et al."Evidence against a Pleistocene desert refugium in the Lower Colorado River Basin".JOURNAL OF BIOGEOGRAPHY 41.9(2014):1769-1780. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。