| RRC ID |
83005
|
| 著者 |
George J, Dimson M, Dunn RE, Lindsey EL, Farrell AB, Aguilar BP, MacDonald GM.
|
| タイトル |
Identification of fossil juniper seeds from Rancho La Brea (California, USA): drought and extirpation in the Late Pleistocene.
|
| ジャーナル |
New Phytol
|
| Abstract |
Juniperus spp. are keystone shrubs in western North America and important climatic indicators in paleo-records. However, a lack of taxonomic resolution among fossil species limits our ability to track past environmental changes. Plant macrofossils at Rancho La Brea (RLB) allow for reconstructions of juniper occurrence to species across 60 000 yr. We use microscopy, image analysis, species distribution modeling (SDM), and radiocarbon dating to identify an unknown Juniperus species at RLB and put it into chronological context with fossil Juniperus californica at the site to infer past environmental conditions. We identify the unknown taxon as Juniperus scopulorum Sargent, 1897. The Pleistocene occurrence of this species in California expands its known distribution and documents its extirpation. Temporal ranges of the two fossil junipers alternate, revealing a pattern of differential climatic sensitivity throughout the end of the Pleistocene. Occurrence patterns suggest sensitivity to temperature, moisture availability, and the presence of two mega-droughts at c. 48-44.5 ka and c. 29.3-25.2 ka. Extirpation of both taxa by c. 13 ka is likely driven by climate, megafaunal extinction, and increasing fire. The extirpation of fossil junipers during these past climatic events demonstrates vulnerability of juniper species in the face of global change.
|
| 巻・号 |
245(4)
|
| ページ |
1746-1761
|
| 公開日 |
2024-12-10
|
| DOI |
10.1111/nph.20324
|
| PMID |
39655659
|
| PMC |
PMC11754944
|
| MeSH |
California
Droughts
Fossils* / ultrastructure
Image Processing, Computer-Assisted
Juniperus* / classification
Juniperus* / ultrastructure
Microscopy, Electron, Scanning
Microscopy, Fluorescence
Models, Biological
Plant Dispersal
Radiometric Dating
Seeds* / ultrastructure
Species Specificity
|
| IF |
8.512
|
| リソース情報 |
| GBIF |
Plant Specimen Database of Tama Forest Science Garden, Forestry and Forest Products Research Institute, Japan
Ibaraki Nature Museum, Vascular Plants collection
Plant specimens deposited in Osaka Museum of Natural History, Japan
Plant specimens of Toyota City Nature Sanctuary (from non-museum circle) |
