DOI: 10.1016/j.palaeo.2016.10.038
论文题名: Re-evaluation of using rhodolith growth patterns for paleoenvironmental reconstruction: An example from the Gulf of Panama
作者: Sletten H.R. ; Andrus C.F.T. ; Guzmán H.M. ; Halfar J.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2017
卷: 465 起始页码: 264
结束页码: 277
语种: 英语
英文关键词: Algochronology
; Banding
; Coralline red algae
; Growth rates
; Gulf of Panama
; Rhodoliths
英文摘要: Rhodoliths are a proxy data source for understanding environment and climate variation in tropical to arctic oceans. A clear understanding of growth pattern and rate is required to interpret time-series proxy data. Variability in growth on multiple-axes of a single rhodolith has not been extensively studied. This investigation compares algal band counting and dating methods found in the literature, and has implications for detecting biases in branch selection for growth and geochemical analyses. Panamanian rhodoliths (Lithothamnion sp.) were collected at the Archipelago de Las Perlas, Gulf of Panama (GOP). Alizarin Red S (ARS) stain was used to study growth rates and banding patterns for 10 branched samples randomly selected for microcosm experiments over a 172-day period. DNA analysis was used to help determine the dominant species present in the sample group and reduce the possibility of inter-sample variation. Samples were overturned every 2 weeks for a multi-axial growth test and were grown under ambient seawater conditions except for the addition of LED lighting. Growth post-ARS staining was measured along the long (A), intermediate (B), and short (C) axes. Bisected branches show banding correlated with growth rate while banding was highly variable within an individual and between individuals. Average growth band widths in both the pre- and post-ARS stained growth were approximately the same, suggesting that non-environmental factors, such as overturning or biological influences, can cause the formation of growth increments. Differences in growth pattern and rate suggest that careful inspection of growth formation is needed before pursuing rhodolith-based time series proxy research. © 2016 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68140
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geological Sciences, University of Alabama, 201 7th Ave, Room 2003 Bevill Bldg, Tuscaloosa, AL, United States; Smithsonian Tropical Research Institute, Apartado Postal 0843-03092, Balboa, Ancon, Panamá, Panama; CPS-Department, University of Toronto at Mississauga, 3359 Mississauga Rd. N, Mississauga, ON, Canada
Recommended Citation:
Sletten H.R.,Andrus C.F.T.,Guzmán H.M.,et al. Re-evaluation of using rhodolith growth patterns for paleoenvironmental reconstruction: An example from the Gulf of Panama[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2017-01-01,465