Temperature-related body size change of marine benthic macroinvertebrates across the Early Toarcian Anoxic Event
Temperature-related body size change of marine benthic macroinvertebrates across the Early Toarcian Anoxic Event
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DOI：
10.1038/s41598-020-61393-5
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发表时间：
2020-03
影响因子：
4.6
通讯作者：
V. Piazza;C. Ullmann;M. Aberhan
中科院分区：
文献类型：
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作者：
V. Piazza;C. Ullmann;M. Aberhan
托阿尔西期海洋缺氧事件(TOAE，早侏罗世，距今182年 Ma)以严重的环境扰动为特征，导致栖息地退化和海洋生物灭绝。变暖引起的缺氧通常被认为是主要的驱动因素，但由于海洋生物也在富氧环境中受到影响，因此需要解决温度升高的作用及其对海洋生物的影响。身体大小是生物体的一个基本特征，预计体型会因热应激而减小。我们提供了伊比利亚盆地含氧生境中双壳类和腕足类的定量大小数据，并结合地球化学替代数据(δ13C和δ18O)，研究了温度变化与身体大小的关系。我们发现双壳类群落的平均贝壳大小与同位素得出的温度估计值之间存在强烈的负相关，这表明热应激是体型减小的主要原因。虽然种内大小的变化很小，但我们发现不同大小物种丰度的变化是TOAE期间群落外壳大小减小的主要机制。在变暖的早期阶段，腕足类经历了一次大规模的周转，取而代之的是一群几乎是单型的较小的机会主义物种。
The Toarcian Oceanic Anoxic Event (TOAE, Early Jurassic, ~182 Ma ago) was characterised by severe environmental perturbations which led to habitat degradation and extinction of marine species. Warming-induced anoxia is usually identified as main driver, but because marine life was also affected in oxygenated environments the role of raised temperature and its effects on marine life need to be addressed. Body size is a fundamental characteristic of organisms and is expected to decrease as a response to heat stress. We present quantitative size data of bivalves and brachiopods across the TOAE from oxygenated habitats in the Iberian Basin, integrated with geochemical proxy data (δ13C and δ18O), to investigate the relationship between changes in temperature and body size. We find a strong negative correlation between the mean shell size of bivalve communities and isotope-derived temperature estimates, suggesting heat stress as a main cause of body size reduction. While within-species size changes were minor, we identify changes in the abundance of differently sized species as the dominant mechanism of reduced community shell size during the TOAE. Brachiopods experienced a wholesale turnover across the early warming phase and were replaced by a virtually monotypic assemblage of a smaller-sized, opportunistic species.