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首页> 外文期刊>Palaeogeography, Palaeoclimatology, Palaeoecology: An International Journal for the Geo-Sciences >The stable isotope archive of Lake Pannon as a mirror of Late Miocene climate change
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The stable isotope archive of Lake Pannon as a mirror of Late Miocene climate change

机译：潘农湖的稳定同位素档案资料反映了中新世晚期的气候变化

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摘要

Lake Parmon was a long-lived Miocene and Pliocene lake system in Central Europe with a famous endemic mollusc fauna. The radiation of melanopsid gastropods and dreissenid bivalves has been explained simply by the opportunity to settle empty ecological niches after the extinction of marine life at the end of the Middle Miocene. This model, however, fails to explain the offset in the timings of evolutionary pulses in different mollusc families. Stable isotope data (oxygen, carbon) indicate a strong climatic forcing on these radiations. Moreover, the investigated time span covers the well-known Vallesian optimum and subsequent crises in European terrestrial ecosystems during the Late Miocene. The new palaeoclimatic data on the strongly changing isotope patterns of mollusc aragonite of Lake Pannon might shed light on the mechanisms acting during this crucial period. According to the new interpretation, the early lake (similar to 11.6 Ma) was still influenced by the latest Middle Miocene dry spell. This phase coincided with a pronounced radiation of melanopsid gastropods. During the warm early Late Miocene (similar to 10 Ma) humidity increased and culminated in a phase with high summer precipitation. This caused a reorganisation of the coastal-deltaic faunas, suppressing the radiation of melanopsids. On the other hand, high nutrient loads favoured the dispersion of filter-feeding dreissenids. Despite steadily declining salinity, Lake Pannon remained an alkaline lake with pronounced stratification that was apparently periodically disrupted only during the humid early Late Miocene. A separation of the isotope data into genera and ecological guilds is the prerequisite for discussing overall trends of long-lived lake systems. (c) 2007 Elsevier B.V. All rights reserved.
机译：帕蒙湖是中欧一个长寿的中新世和上新世的湖泊系统，拥有著名的地方性软体动物区系。简单地说，中新世中期末海洋生物灭绝后，有机会解决空的生态位，从而解释了黑腹纲腹足类和蝶类双壳类动物的辐射。但是，该模型无法解释不同软体动物家族中进化脉冲的时间偏移。稳定的同位素数据（氧，碳）表明这些辐射具有强烈的气候强迫作用。此外，调查的时间跨度涵盖了中新世晚期欧洲陆地生态系统中众所周知的Vallesian最适和随后的危机。有关潘农湖软体文石的同位素模式发生剧烈变化的新的古气候数据，可能有助于阐明这一关键时期的作用机理。根据新的解释，早期的湖泊（类似于11.6 Ma）仍然受到最新的中新世中期干旱的影响。这个阶段与黑腹足纲动物的明显辐射相吻合。在温暖的中新世晚期（类似于10 Ma）早期，湿度增加并达到顶峰，夏季降水很高。这导致了沿海三角洲动物区系的重组，从而抑制了黑皮动物的辐射。另一方面，高养分含量有利于滤食性类杜鹃花的分散。尽管盐度稳定下降，但潘农湖仍然是碱性湖泊，具有明显的分层，显然只有在潮湿的中新世晚期才周期性地被破坏。将同位素数据分为属和生态行会是讨论长寿命湖泊系统总体趋势的前提。 （c）2007 Elsevier B.V.保留所有权利。

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