Potential and limits of benthic foraminiferal ecological indices in paleoenvironmental reconstructions: a case from a Holocene succession of the Po Delta, Italy

IF 1.3 4区 地球科学 Q3 PALEONTOLOGY
Utsha Dasgupta, G. Barbieri, S. Vaiani, Anupam Ghosh
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引用次数: 5

Abstract

Classical (paleo-)ecological indices extracted from benthic foraminiferal assemblages are commonly applied to determine past environmental conditions.We tested the efficiency of selected indices (including wall type proportion, epifaunal/infaunal ratio and pooled diversity indices) on benthic foraminifera from a Holocene shallow marine succession of the Po Delta, in order to evaluate their advantages, limits and differences. The paleoenvironmental record was determined integrating species composition of assemblages. All indices clearly discriminated between low and high riverine influence, even though the boundary at three different core depths revealed their different sensitivity to the faunal response under hanging environmental conditions in terms of organic matter and sediment supply. Specifically, the lowest boundary was highlighted by wall structural types and epifaunal/infaunal ratio that were able to track the first inputs of organic matter provided by the prograding Po River mouths. Upward, low sand concentration and moderate foraminiferal abundance (expressed as Total Foraminiferal Number) indicated significant supplies of fine-grained sediments within a prodelta paleoenvironment. Lastly, diversity indices revealed stressful prodelta conditions with remarkable low diversity and high dominance values. We show that high paleoenvironmental resolution can be obtained through the integration of faunal indices, species composition and sediment grain size within deltaic successions, where many indices should be considered to comprehensively understand the onset of riverine influenced conditions.
底栖有孔虫生态指标在古环境重建中的潜力与局限:以意大利波河三角洲全新世演替为例
从底栖有孔虫组合中提取的经典(古)生态指数通常用于确定过去的环境条件。通过对坡三角洲全新世浅海演替中底栖有孔虫的壁型比例、底面/底面比值和综合多样性指数等指标的效率进行测试,以评价其优势、局限性和差异。结合组合的物种组成确定了古环境记录。尽管三个不同岩心深度的边界在有机质和沉积物供应方面显示出它们对悬挂环境条件下动物响应的不同敏感性,但所有指标都清楚地区分了河流影响的高低。具体而言,最低边界由墙结构类型和沟外/沟内比值突出,能够追踪浦江河口推进提供的有机质的首次输入。向上,低砂浓度和中等有孔虫丰度(以有孔虫总数表示)表明前三角洲古环境中存在大量细粒沉积物。多样性指数表明,前三角洲环境具有显著的低多样性和高优势值。研究表明,在三角洲序列中,综合动物群指数、物种组成和沉积物粒度可以获得较高的古环境分辨率,要全面了解河流影响条件的发生,需要考虑许多指标。
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来源期刊
Micropaleontology
Micropaleontology 地学-古生物学
CiteScore
3.20
自引率
6.70%
发文量
18
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. Owned by The Micropalaeontological Society, the scope of the journal is broad, demonstrating the application of microfossils to solving broad geoscience issues.
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