IS ABERRANCY A RELIABLE INDICATOR FOR MAJOR PALEOCLIMATIC DISTURBANCE?

IF 1.5 4区地球科学 Q2 GEOLOGY

Palaios Pub Date : 2022-05-24 DOI:10.2110/palo.2021.019

Stephen Stukins

引用次数: 4

Abstract

Abstract: Aberrant forms of many different spore and pollen taxa (sporomorphs) are often used to assess timings and extent of environmental stress at major extinction/climate events. However, little is known about the normal level of malformations in these taxa. Malformation can manifest in several different ways, including significant size differences (± from the accepted range for the species), retention of pollen/spores within tetrads, and unusual and inconsistent morphological aberrations. This study analyses one commonly used pollen genus, Classopollis, and its aberrant forms, from the Bajocian of Argentina. Tetrads, including those incorporating malformed/aborted pollen grains, are found to be common, showing that tetrads of Classopollis are not a reliable signal of major environmental disturbance. The results and discussion presented here emphasize why palynological data must be interpreted in context of the depositional dynamics, facies changes and how they affect the assemblages in conjunction with understanding variations in the strategies of individual flora.

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异常是重大古气候扰动的可靠指标吗?

摘要：许多不同孢子和花粉分类群（孢子形态）的异常形式通常用于评估重大灭绝/气候事件中环境压力的时间和程度。然而，人们对这些分类群中畸形的正常程度知之甚少。畸形可以以几种不同的方式表现出来，包括显著的大小差异（与物种可接受的范围相差±）、花粉/孢子在四分体内的滞留，以及不寻常和不一致的形态畸变。本研究分析了阿根廷巴乔西亚一个常用的花粉属Classopollis及其变异形式。四分体，包括那些含有畸形/流产花粉粒的四分体被发现是常见的，这表明Classopolis四分体不是主要环境干扰的可靠信号。本文的结果和讨论强调了为什么必须在沉积动力学、相变化的背景下解释孢粉学数据，以及它们如何影响组合，同时理解单个植物群策略的变化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Palaios 地学-地质学

CiteScore

2.80

自引率

12.50%

发文量

审稿时长

6 months

期刊介绍： PALAIOS is a monthly journal, founded in 1986, dedicated to emphasizing the impact of life on Earth''s history as recorded in the paleontological and sedimentological records. PALAIOS disseminates information to an international spectrum of geologists and biologists interested in a broad range of topics, including, but not limited to, biogeochemistry, ichnology, paleoclimatology, paleoecology, paleoceanography, sedimentology, stratigraphy, geomicrobiology, paleobiogeochemistry, and astrobiology. PALAIOS publishes original papers that emphasize using paleontology to answer important geological and biological questions that further our understanding of Earth history. Accordingly, manuscripts whose subject matter and conclusions have broader geologic implications are much more likely to be selected for publication. Given that the purpose of PALAIOS is to generate enthusiasm for paleontology among a broad spectrum of readers, the editors request the following: titles that generate immediate interest; abstracts that emphasize important conclusions; illustrations of professional caliber used in place of words; and lively, yet scholarly, text.