Environmental changes governed the diversity of marine ecosystems and the evolution of marine reptiles during the Jurassic. Abrupt climatic changes, mainly cooling, produced crises in marine ecosystems including marine reptiles, but global warming events at the Pliensbachian/Toarcian boundary and the early Toarcian Jenkyns Event led to a second order mass extinction. The Jenkyns Event coincides with exceptional preservation of marine reptiles in black shales, so widespread extinctions are masked to some extent by increases in specimens and diversity in the Lagerstätten. Marine reptile diversity responded to this biotic crisis; in the early Toarcian, stenopterygid ichthyosaurs and marine crocodylomorphs (thalattosuchians) diversified whereas some groups that survived the Jenkyns Event disappeared during the hyperthermal conditions of the middle and late Toarcian, including ichthyosaurs (leptonectids, temnodontosaurids, baso-parvipelvians), and sauropterygians (plesiosaurids, microcleidids).

中文翻译：

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早期托阿尔西亚气候变化对海洋爬行动物的影响：灭绝与恢复


环境变化支配着侏罗纪海洋生态系统的多样性和海洋爬行动物的进化。突然的气候变化，主要是冷却，在包括海洋爬行动物在内的海洋生态系统中产生了危机，但 Pliensbachian/Toarcian 边界的全球变暖事件和早期 Toarcian Jenkyns 事件导致了二级大灭绝。詹金斯事件恰逢黑色页岩中海洋爬行动物的特殊保存，因此拉格施泰滕 （Lagerstätten） 标本的增加和多样性在一定程度上掩盖了大范围的灭绝。海洋爬行动物的多样性对这种生物危机做出了反应;在托阿尔纪早期，狭翅目鱼龙和海洋鳄形目（Thalattosuchians）多样化，而一些在 Jenkyns 事件中幸存下来的类群在托阿尔纪中晚期的高温条件下消失了，包括鱼龙（轻端龙类、Temnodontosaurids、baso-parvipelvians）和蜥蜍类（蛇颈龙类、microcleidids）。