DOI: 10.1016/j.quascirev.2017.05.001
Scopus记录号: 2-s2.0-85019369693
论文题名: A 50,000 year insect record from Rancho La Brea, Southern California: Insights into past climate and fossil deposition
作者: Holden A.R. ; Southon J.R. ; Will K. ; Kirby M.E. ; Aalbu R.L. ; Markey M.J.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 168 起始页码: 123
结束页码: 136
语种: 英语
英文关键词: Biostratigraphy
; Last Glacial
; North America
; Paleoclimatology
; Paleoentomology
; Paleoenvironment
; Quaternary
; Radiogenic isotopes
; Rancho La Brea Tar Pits
Scopus关键词: Biostratigraphy
; Climatology
; Glacial geology
; Stratigraphy
; Last glacial
; North America
; Paleo-environment
; Paleoclimatology
; Paleoentomology
; Quaternary
; Radiogenic isotopes
; Rancho La Brea Tar Pits
; Climate change
; accelerator mass spectrometry
; beetle
; biostratigraphy
; climate variation
; entomology
; fossil record
; paleoclimate
; paleoenvironment
; palynology
; proxy climate record
; Quaternary
; radiocarbon dating
; California
; Lake Elsinore
; Los Angeles Basin
; Pacific Ocean
; Rancho La Brea
; Santa Barbara Basin
; United States
; Carabidae
; Coleoptera
; Hexapoda
; Tenebrionidae
英文摘要: Rigorously studied and dated Late Quaternary paleoenvironmental reconstructions from Ranch La Brea (RLB) and the Los Angeles Basin are scarce. Here, we use data from AMS radiocarbon dated insect fragments to infer local climates over the past 50,000 years. Our results indicate: 1) Quaternary insect remains can be located with great accuracy in radiocarbon time, and 2) well-dated and documented climate indicator beetle species are sensitive proxies for environmental change in the Los Angeles Basin. A total of 182 extant RLB ground and darkling beetle species (Coleoptera: Carabidae, Tenebrionidae) were radiocarbon dated. The resulting radiocarbon dates form a semi-continuous range from ∼50 to 28, 16–7.5, and 4 kcal yrs BP to the present. Associated insect climate ranges indicate past conditions consistent with, or very similar to, the current Los Angeles Basin Mediterranean climate. Importantly, these insect data suggest higher temperatures and aridity than inferred previously from other RLB proxies. Furthermore, wider-than-assumed dating spreads for some deposits emphasize the lack of biostratigraphy for RLB, and challenge inferences based on limited sets of radiocarbon dates and assumptions about stratigraphic integrity. Our results demonstrate the necessity to independently radiocarbon date each taxon. The insect paleoclimate interpretations were compared to regional pollen data, primarily from various southern Californian sites including Lake Elsinore and Santa Barbara Basin. These comparisons reveal an important difference in climate interpretations for the last Glacial: the RLB insect data suggest climate similar to the current one, while the regional pollen data have been interpreted as indicating a climate wetter than present. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59192
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Richard Gilder Graduate School at the American Museum of Natural History, 79th at Central Park West, New York City, NY, United States; Department of Entomology, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA, United States; La Brea Tar Pits and Museum, 5801 Wilshire Boulevard, Los Angeles, CA, United States; Department of Earth System Science, University of California-Irvine, Irvine, CA, United States; Essig Museum of Entomology, University of California, Berkeley, CA, United States; California State University, Fullerton, Department of Geological Sciences, Fullerton, CA, United States; California Academy of Sciences, 55 Music Concourse Drive, San Francisco, CA, United States; AIR Worldwide, 131 Dartmouth St, Boston, MA, United States
Recommended Citation:
Holden A.R.,Southon J.R.,Will K.,et al. A 50,000 year insect record from Rancho La Brea, Southern California: Insights into past climate and fossil deposition[J]. Quaternary Science Reviews,2017-01-01,168