Spiranthes bightensis (Orchidaceae), a New and Rare Cryptic Hybrid Species Endemic to the U. S. Mid-Atlantic Coast
Spiranthes bightensis (Orchidaceae), a New and Rare Cryptic Hybrid Species Endemic to the U. S. Mid-Atlantic Coast
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DOI：
10.11646/phytotaxa.498.3.2
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发表时间：
2021-04-30
期刊：
影响因子：
1.1
通讯作者：
Pace, Matthew C.
中科院分区：
文献类型：
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作者：
Pace, Matthew C.
识别物种多样性是具有挑战性的属，显示种间的相似性和种内变异;杂交和进化的神秘杂交种放大了这些挑战。最近的分子和形态学研究集中在盘龙参（兰科）的系统学支持杂交物种形成的物种多样性的重要驱动力，特别是在S。cernua物种复合体。新的分子和形态测量学数据提供了一个新的和罕见的隐性杂交种的证据，从古老的杂交S。cernua？S. odorata，在此描述为S. bightensis。虽然S. bightensis与S. cernua，它不与该种共存，它是异地相对于S。香果。特有的一个狭窄的地区从Delmarva半岛延伸到长岛，纽约，这个新的物种出现在东北部的阴影大都市，似乎已经经历了一个重大的人口下降，在过去的200年。通过将这种独特的进化谱系识别为新物种，这项研究是为这种稀有物种制定保护协议的第一步，并强调了北美地质沿海平原对生物多样性保护和进化的重要性。
Recognizing species diversity is challenging in genera that display interspecific similarity and intraspecific variation; hybridization and the evolution of cryptic hybrid species amplifies these challenges. Recent molecular and morphological research focused on the systematics of Spiranthes (Orchidaceae) support hybrid speciation as an important driver of species diversity, particularly within the S. cernua species complex. Working under an integrated history-bound phylogenetic species concept, new molecular and morphometric data provide evidence for a new and rare cryptic hybrid species resulting from the ancient hybridization of S. cernua ? S. odorata, here described as S. bightensis. Although S. bightensis is regionally sympatric with S. cernua it does not co-occur with that species, and it is allopatric with respect to S. odorata. Endemic to a narrow region extending from the Delmarva Peninsula to Long Island, New York, this new species occurs in the shadow of the Northeast megalopolis and appears to have undergone a major population decline over the last 200 years. By recognizing this distinct evolutionary lineage as a new species, this research is the first step towards developing conservation protocols for this rare species and highlights the importance of the North American Geologic Coastal Plain for biodiversity conservation and evolution.