OAK CATKINS, LEAVES AND FRUITS FROM THE OLIGOCENE CATAHOULA FORMATION AND THEIR EVOLUTIONARY SIGNIFICANCE
OAK CATKINS, LEAVES AND FRUITS FROM THE OLIGOCENE CATAHOULA FORMATION AND THEIR EVOLUTIONARY SIGNIFICANCE
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DOI：
10.2307/2443119
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发表时间：
1983-01-01
影响因子：
3
通讯作者：
CREPET, WL
中科院分区：
文献类型：
--
作者：
DAGHLIAN, CP;CREPET, WL
来自渐新世卡塔胡拉组的栎属的雄花花序、叶和果实的遗骸与现代的红藤壶亚属（柔枝和叶）和鳞藤壶亚属（果实）有着惊人的相似性。现代亚属的出现在渐新世，在化石中首次出现栎属之后的很短时间内，记录表明栎属的现代化是一个快速进化的时期。这一时期的相对快速的演变显然是为了响应全球气候变化开始在始新世-渐新世的边界，可能被夸大了渐新世全球海平面的低点。这些事件引起的气候恶化可能使早第三纪栎进入新的适应区，通过迁移和杂交，最终导致橡树的现代化。[Q. oligocenensis、寡生Q. huntsvillensis和Q.卡塔胡拉虫描述了[。
Remains of staminate inflorescences, leaves, and fruits of Quercus from the Oligocene Catahoula Formation show striking similarity to modern subgenera Erythrobalanus(catkins and leaves) and Lepidobalanus (fruits). The appearance of modern subgenera in the Oligocene, only a short period of time after the 1st occurrences of Quercus in the fossil, record suggest a period of rapid evolution resulting in the modernization of Quercus. This period of relatively rapid evolution was apparently in response to global climatic changes initiated at the Eocene-Oligocene boundary that may have been exaggerated by an Oligocene global lowstand of sea level. The climatic deterioration induced by these events may have allowed Paleogene Quercus to enter new adaptive zones through migration and hybridization culminating in the final major modernization of the oaks. [Q. oligocenensis, Q. huntsvillensis, and Q. catahoulaensis spp. nov. were described.].