Recovery dynamics of benthic marine communities from the Lower Triassic Werfen Formation, northern Italy
Recovery dynamics of benthic marine communities from the Lower Triassic Werfen Formation, northern Italy
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DOI：
10.1111/let.12121
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发表时间：
2015-10
期刊：
影响因子：
1.5
通讯作者：
R. Hofmann;M. Hautmann;H. Bucher
中科院分区：
文献类型：
--
作者：
R. Hofmann;M. Hautmann;H. Bucher
Hofmann， R., Hautmann， M. & Bucher， H. 2014：意大利北部下三叠统Werfen组底栖生物群落的恢复动态。Lethaia, DOI: 10.1111/let.12121。意大利北部的下三叠世Werfen组代表了早三叠世生态系统的重要档案。基于物种水平鉴定的定量群落分析，我们重建了整个单元在二叠纪末大灭绝后的底栖生态系统恢复。底栖生物大型化石群落分析表明，在格里斯巴氏纪和格里斯巴氏-二叠纪过渡时期，底栖生物开始恢复。在第二叠纪末期，观察到环境条件可能恶化。Werfen组史密斯段以高硅质碎屑输入为特征，在史密斯-斯帕特界线附近停止输入。Spathian标志着Werfen组的最终恢复阶段。与其他古地理区域的对比表明，Griesbachian的恢复和Dienerian的下降即使不是全球范围的，也是区域间的，而Werfen组smith的多样性低则是局部的信号。与菊石和牙形刺的恢复动态相反，smith - spathian边界区间对于底栖生态系统来说并不是静止的。Spathian恢复脉冲也可能是一个区域间事件，至少在古热带地区是这样。这些结果与先前提出的在格里斯巴哈时间间隔内持续敌对条件的情景相反，并强调了一个受格里斯巴哈时间限制的初始恢复阶段。相反，底栖生态系统明显缓慢的恢复至少部分是由二叠纪期间短期环境扰动造成的挫折造成的。□多样性，早三叠纪，古生态，恢复，韦尔芬组。
Hofmann, R., Hautmann, M. & Bucher, H. 2014: Recovery dynamics of benthic marine communities from the Lower Triassic Werfen Formation, northern Italy. Lethaia, DOI: 10.1111/let.12121. The Lower Triassic Werfen Formation of northern Italy represents an important archive for Early Triassic ecosystems. Based on quantitative community analysis using species level identifications, we reconstruct the recovery of benthic ecosystems after the end-Permian mass extinction throughout this unit. The analysis of benthic macrofossil communities shows that incipient recovery has taken place during the Griesbachian and the GriesbachiannDienerian transition. A probable deterioration in environmental conditions is observed towards the end of the Dienerian. The Smithian part of the Werfen Formation is characterized by high siliciclastic input, which ceases around the Smithian-Spathian boundary. The Spathian marks the definitive phase of recovery in the Werfen Formation. The comparison of this pattern with other palaoegeographical regions suggests that both the Griesbachian recovery and the Dienerian decline were of inter-regional if not global extent, whereas the Smithian diversity low in the Werfen Formation is a local signal. In contrast to the recovery dynamics of ammonoids and conodonts, the SmithiannSpathian boundary interval was no caesura for benthic ecosystems. The Spathian recovery pulse is possibly also an inter-regional event, at least in the palaeotropics. These results are in contrast with the previously proposed scenario of persistent hostile conditions during the Griesbachian time interval and highlight an initial recovery phase restricted to Griesbachian times. Instead, the apparently sluggish recovery of benthic ecosystems was at least partly shaped by set-backs due to short-term environmental perturbations during the Dienerian.□ Diversity, early Triassic, palaeoecology, recovery, Werfen Formation.