From offshore to onshore: multiple origins of shallow-water corals from deep-sea ancestors.
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Shallow-water tropical reefs and the deep sea represent the two most diverse marine environments. Understanding the origin and diversification of this biodiversity is a major quest in ecology and evolution. The most prominent and well-supported explanation, articulated since the first explorations of the deep sea, holds that benthic marine fauna originated in shallow, onshore environments, and diversified into deeper waters. In contrast, evidence that groups of marine organisms originated in the deep sea is limited, and the possibility that deep-water taxa have contributed to the formation of shallow-water communities remains untested with phylogenetic methods. Here we show that stylasterid corals (Cnidaria: Hydrozoa: Stylasteridae)--the second most diverse group of hard corals--originated and diversified extensively in the deep sea, and subsequently invaded shallow waters. Our phylogenetic results show that deep-water stylasterid corals have invaded the shallow-water tropics three times, with one additional invasion of the shallow-water temperate zone. Our results also show that anti-predatory innovations arose in the deep sea, but were not involved in the shallow-water invasions. These findings are the first robust evidence that an important group of tropical shallow-water marine animals evolved from deep-water ancestors.
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Published Version (Please cite this version)10.1371/journal.pone.0002429
Publication InfoLindner, A; Cairns, SD; & Cunningham, CW (2008). From offshore to onshore: multiple origins of shallow-water corals from deep-sea ancestors. PLoS One, 3(6). pp. e2429. 10.1371/journal.pone.0002429. Retrieved from https://hdl.handle.net/10161/4496.
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