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首页> 外文期刊>Chelonian conservation and biology >Side-Necked Turtles (Testudines, Pleurodira) from the Ancient Gulf Coastal Plain of Florida During Middle Cenozoic Megathermals
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Side-Necked Turtles (Testudines, Pleurodira) from the Ancient Gulf Coastal Plain of Florida During Middle Cenozoic Megathermals

机译：中新生代超高温期间佛罗里达州古海湾沿岸平原的侧颈海龟（Testudines，Pleurodira）

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Fossils from paleocoastal deposits in northwestern Florida represent at least 3 pleurodire taxa. Biochronologic and paleoclimatic correlates suggest that the presence and absence of side-necked turtles in Florida was synchronous with global climatic shifts in the middle to late Paleogene and early Neogene. The oldest pleurodire record in Florida is from the end of the Greenhouse World in the middle to late Eocene, followed by a hiatus of similar to 11 million yrs during the onset of the Icehouse World in the early Oligocene. Their sojourn in Florida during the latest Oligocene (25-24 Ma) was concurrent with a brief late Oligocene warming (LOW), and a subsequent hiatus in the early Miocene (similar to 24-18 Ma) was contemporaneous with global cooling. Their resettlement and most populous occurrences in Florida during the middle to late Hemingfordian through early Barstovian (similar to 18-15.5 Ma) coincided with the Middle Miocene Climatic Optimum (MMCO), a significant global warming event. Pleurodires are indicators that paleoclimate in the southeastern United States was frost free during the Eocene, LOW, and MMCO with air and water temperatures warm enough to support these generally cold-intolerant turtles. A small-bodied podocnemidid existed in the Cucaracha Formation (similar to 19.05-18.8 Ma) of Panama during the early Miocene pleurodire hiatus in Florida, and this or a closely related taxon later dispersed into Florida by the early Barstovian, when temperatures were suitable during the MMCO. Previously reported pleurodire fossils from the temporally mixed Lee Creek Mine of North Carolina are most likely middle Miocene in age when pleurodires were common in the Atlantic Coastal Plain of the southeastern United States. The presence of pleurodires in the Seaboard Local Fauna could help constrain the age of the fauna to younger than 18 Ma and probably closer to 17 Ma based on hypothesized paleoclimate at that time. A pleurodire from the middle Eocene Point "A'' Dam site in southern Alabama may represent a late occurrence of the Bothremydidae.
机译：佛罗里达州西北部古卵石沉积物中的化石至少代表了三个胸膜动物群。生物年代学和古气候的相关性表明，佛罗里达州侧颈龟的有无与古近纪中晚期到新近纪的全球气候变化同步。佛罗里达最古老的胸膜记录是始于始新世中期到晚期的温室世界末期，随后是渐新世早期冰室世界爆发期间的大约1100万年的裂隙。他们在最近的渐新世（25-24 Ma）期间在佛罗里达定居，同时经历了短暂的渐新世晚期变暖（LOW），并且随后的中新世早期裂隙（类似于24-18 Ma）与全球降温同时发生。它们在海明福德时期至巴斯托维时期早期（类似于18-15.5 Ma）期间在佛罗里达州的重新定居和人口最多的事件与中新世最佳气候中期（MMCO）相吻合。杏鲍菇是在美国始新世，LOW和MMCO期间无霜冻的指标，空气和水温足以支撑这些通常不耐寒的海龟。在佛罗里达的中新世胸膜上裂裂早期，巴拿马的甲骨ach（类似于19.05-18.8 Ma）中存在一个小体对角线虫；当温度适宜时，这种或密切相关的分类群随后在巴斯托维亚早期扩散到佛罗里达。 MMCO。以前报道的北卡罗来纳州Lee Creek矿的时空混合化石是最古老的中新世时期，而在美国东南部的大西洋沿岸地区常见的是化脓层。根据当时的假定古气候，在沿海本地动物区系中存在胸膜寄生虫可帮助将动物的年龄限制在18 Ma以下，并可能接近17 Ma。来自阿拉巴马州南部始新世中部“ A”水坝中段的胸膜炎可能代表了双生夜蛾科的晚期发生。

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