Stable Isotopic Variability in Individual Benthic Foraminifera from the Continental Shelf of Tropical Brazil

IF 0.9 4区 地球科学 Q4 PALEONTOLOGY
K. Billups, P. Eichler, C. Ravelo, Luzia Liniane do Nascimento, H. Vital, M. Gomes
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引用次数: 1

Abstract

We analyzed nine benthic foraminiferal species from the Açu Reef belonging to the orders Rotaliida and Miliolida, symbiont-bearing (Rotaliida: Amphistegina gibbosa, Heterostegina depressa; Miliolida: Peneroplis carinatus, Archaias angulatus, Amphisorus hemprichii, and Archaias compressus) and symbiont-barren (Rotaliida: Buccella peruviana, Pseudononion atlanticum; Miliolida: Quinqueloculina lamarckiana). Stable isotopes measured on individual tests display a large intraspecific variability (δ18O: ∼1–1.5‰; δ13C: ∼2–3.5‰) that is not associated with site location, sampling season, or water depth. Positive correlation between δ13C and δ18O values is significant in three of the species (A. gibbosa, B. peruviana, and Q. lamarckiana), with a regression slope similar to other marine calcifiers (∼2‰ δ13C/‰ δ18O), perhaps related to the carbonate chemistry of the calcifying fluid. With the exception of A. gibbosa, offsets from δ18O equilibrium, when distinct, tend to be positive. Offsets from δ13C of ΣCO2 of sea water are negative for two of the rotaliids (A. gibbosa and H. depressa) and positive for three of the miliolids (P. carinatus, A. angulatus, A. hemprichii), with non-symbiont-bearing species of both orders being close to the sea water values (∼ 1.3–2‰). These δ13C differences are consistent with calcification pathways of rotaliids versus miliolids, with the former drawing carbon from an internal pool and the latter from ambient seawater. Our study contributes a large data set that illustrates the importance of vital and abiotic effects on the stable isotopic composition of large benthic foraminifera in a tropical continental shelf, limiting their applicability as paleoenvironmental tracers.
热带巴西大陆架底栖有孔虫个体的稳定同位素变异性
我们分析了来自阿苏礁的9种底栖有孔虫,它们属于Rotaliida目和Milolida目,有共生体(轮虫目:长臂两栖纲、凹陷异足纲;Miliolida:隆脊小蠊、角足大蠊、宽脊两栖纲和压缩大蠊)和无共生体(轮虫目:秘鲁小蠊属、大西洋拟诺龙属;Milioida:拉马克基金眼虫)。在单独测试中测量的稳定同位素显示出较大的种内变异性(δ18O:~1–1.5‰;δ13C:~2–3.5‰),与现场位置、采样季节或水深无关。δ13C和δ18O值之间的正相关关系在其中三个物种(A.gibbosa、B.peruviana和Q.lamarckiana)中是显著的,其回归斜率与其他海洋钙化物相似(~2‰δ13C/‰δ18O),可能与钙化液的碳酸盐化学有关。除了长臂猿外,当δ18O平衡的偏移不同时,往往是正的。海水∑CO2的δ13C偏移量对两种轮状体(A.gibbosa和H.depression)为负,对三种粟粒内酯(P.carinatus、A.angulatus、A.hemprichii)为正,两个目的非共生体物种都接近海水值(~1.3–2‰)。这些δ13C差异与轮状体与粟粒内酯的钙化途径一致,前者从内部池中抽取碳,而后者从环境海水中抽取碳。我们的研究提供了大量数据集,说明了重要和非生物影响对热带大陆架大型底栖有孔虫稳定同位素组成的重要性,限制了它们作为古环境示踪剂的适用性。
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来源期刊
Journal of Foraminiferal Research
Journal of Foraminiferal Research 地学-古生物学
CiteScore
2.10
自引率
9.10%
发文量
32
审稿时长
>12 weeks
期刊介绍: JFR publishes original papers of international interest dealing with the Foraminifera and allied groups of organisms. Review articles are encouraged.
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