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Tree ferns from northern Peru: confirmation of the Amotape-Huancabamba Zone as a unique biotic hotspot in the tropical Andes

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Abstract

The Amotape-Huancabamba Zone, straddling the Huancabamba Depression in the tropical Andes, is often recognized as a major hotspot of species richness for plants and animals in the Neotropics. The biogeographic role of the area as a barrier, transition, or unique endemism zone in the Andes has long been debated. Here, using tree ferns, we take a new look at this question and discuss the biogeographic significance and limits of the Amotape-Huancabamba Zone. We find that tree fern distribution supports the idea that the Amotape-Huancabamba zone is a unique biogeographic unit within the Andes defined by high endemism, overlap of the floras of the Northern and Central Andes, and high overall species richness; however, the centrally located Huancabamba-Marañón depression plays only a minor role as a floristic barrier.

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Tejedor, A., Calatayud, G. Tree ferns from northern Peru: confirmation of the Amotape-Huancabamba Zone as a unique biotic hotspot in the tropical Andes. Brittonia 74, 1–17 (2022). https://doi.org/10.1007/s12228-021-09687-4

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