南极洲麦克默多湾南部的中新世气候最适宜区真菌记录和基于植物的 CREST 气候重建

IF 4.1 3区 地球科学 Q1 PALEONTOLOGY
M. Pilie, Martha E. Gibson, Ingrid C. Romero, N. N. Nuñez Otaño, M. Pound, Jennifer M. K. O'Keefe, S. Warny
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引用次数: 0

摘要

摘要。要评估在中新世等比现在更暖的情况下植物和真菌的分布,就必须进行深时古生物学研究。以前在南极洲麦克默多湾(SMS)南部进行的古生物学研究为罗斯海地区在全球明显变暖时期的新世环境提供了独特的文献资料。本研究在这些研究的基础上,利用之前发表的 SMS 花粉和植物孢子数据,提供了新的气候重建。此外,还对 44 个 SMS 样本进行了重新分析,重点是剖面中的真菌部分,以评估在比现在更暖的条件下真菌的分布情况。应用基于概率的气候重建技术(CREST)为该中新世气候最适宜(MCO)地点提供了基于植物的区域古气候新表征。CREST 重建的古气候比中新世气候最适宜期 SMS 的气候温暖湿润,重建的年平均降水量为 1147 毫米/年-1(95% 置信度范围:238-2611 毫米/年-1),中新世气候最适宜期最年平均温度为 10.3 ∘C(95% 置信度范围:2.0-20.2 ∘C)。CREST 重建符合 SMS MCO 期间的 Cfb Köppen-Geiger 气候类别。这种新的重建与之前使用各种地球化学代用指标进行的重建一致。真菌古生物学分析的结果出人意料,只发现了一种单一形态的真菌,而且含量很低,每克干燥沉积物中的真菌含量高达 199 种。所发现的类群属于 Apiosporaceae 家族,已知可适应多种气候和环境条件。由于真菌是 SMS MCO 古植物群落中的低等成员,而且所发现的一种形态是世界性的,因此不可能利用真菌记录来确认一个狭窄的柯本-盖革气候类别。总之,该研究显示了基于植物的古气候重建的完善,并揭示了真菌在南极 MCO 期间的有限存在。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Miocene Climatic Optimum fungal record and plant-based CREST climatic reconstruction from southern McMurdo Sound, Antarctica
Abstract. Deep-time palynological studies are necessary to evaluate plant and fungal distribution under warmer-than-present scenarios such as those of the Middle Miocene. Previous palynological studies from southern McMurdo Sound, Antarctica (SMS), have provided unique documentation for Neogene environments in the Ross Sea region during a time of pronounced global warming. The present study builds on these studies and provides a new climate reconstruction using the previously published SMS pollen and plant spore data. Additionally, 44 SMS samples were reanalyzed with a focus on the fungal fraction of the section to evaluate the fungal distribution under warmer than present conditions. The probability-based climate reconstruction technique (CREST) was applied to provide a new plant-based representation of regional paleoclimate for this Miocene Climatic Optimum (MCO) locality. CREST reconstructs a paleoclimate that is warmer and significantly wetter than present in SMS during the MCO, with mean annual precipitation reconstructed at 1147 mm yr−1 (95 % confidence range: 238–2611 mm yr−1) and a maximum mean annual temperature of 10.3 ∘C (95 % confidence range: 2.0–20.2 ∘C) for the warmest intervals of the MCO. The CREST reconstruction fits within the Cfb Köppen–Geiger climate class during the MCO of SMS. This new reconstruction agrees with previous reconstructions using various geochemical proxies. The fungal palynological analyses yielded surprising results, with only a single morphotype recovered, in low abundance, with concentrations ranging up to 199 fungi per gram of dried sediment. The taxa present belongs to the Apiosporaceae family and are known to be adapted to a wide range of climate and environmental conditions. As fungi are depauperate members of the SMS MCO palynofloras and because the one morphotype recovered is cosmopolitan, using the fungi record to confirm a narrow Köppen–Geiger climate class is impossible. Overall, the study demonstrates refinement of plant-based paleoclimatic reconstructions and sheds light on the limited presence of fungi during the MCO in Antarctica.
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来源期刊
Journal of Micropalaeontology
Journal of Micropalaeontology 生物-古生物学
CiteScore
4.30
自引率
5.00%
发文量
7
审稿时长
>12 weeks
期刊介绍: The Journal of Micropalaeontology (JM) is an established international journal covering all aspects of microfossils and their application to both applied studies and basic research. In particular we welcome submissions relating to microfossils and their application to palaeoceanography, palaeoclimatology, palaeobiology, evolution, taxonomy, environmental change and molecular phylogeny.
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