DOI: 10.1016/j.palaeo.2014.05.034
论文题名: Evolution of Crustaceans at the edge of the end-Permian crisis: Ichnonetwork analysis of the fluvial succession of Nurra (Permian-Triassic, Sardinia, Italy)
作者: Baucon A. ; Ronchi A. ; Felletti F. ; Neto de Carvalho C.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 410, 期: 1 起始页码: 74
结束页码: 103
语种: 英语
英文关键词: Camborygma
; Decapod evolution
; Ichnonetwork analysis
; Ophiomorpha
; Permian-Triassic extinction
英文摘要: Decapod crustaceans are among the most efficient ecosystemengineers of the Phanerozoic, but the path that led to their engineering success is poorly known. The Permian-Triassic continental succession of Nurra (early Cisuralian-early Middle Triassic; Sardinia, Italy) sheds light on this obscure subject, because it preserves the oldest (Roadian) fluvial Ophiomorpha and Camborygma, ascribed to ghost shrimps (Decapoda: Axiidea, Gebiidea) and crayfishes (Decapoda: Astacidea, Parastacidea), respectively. These crustacean trace fossils are part of awellpreserved ichnofauna including Arenicolites, Diplocraterion, Helminthoidichnites, Palaeophycus, Planolites, rhizoliths, Skolithos, Spongeliomorpha, Taenidium, Treptichnus, alongside an undetermined tetrapod footprint, helical burrows and Sinusichnus-like traces. In light of the abundance of crustacean trace fossils, the Cala Viola section (Roadian-Anisian) was selected for ichnonetwork analysis. This novel approach, focusing on the topology of the association relationships of ichnotaxa, revealed six ichnoassociations, i.e., Rhizohaloes, Taenidium/Ophiomorpha, Helminthoidichnites, Palaeophycus, Skolithos and Arenicolites ichnoassociations. In addition, ichnonetwork analysis shown that Camborygma and Ophiomorpha colonised adjacent, partially overlapping fluvial subenvironments, ranging from active fluvial channels to periaquatic overbanks. As the Nurra occurrences are penecontemporaneous of the astacid/thalassinid diversification (Carboniferous-Early Permian) and coeval with the appearance of crayfishes (Middle Permian), fluvial environments played an important role in the evolution of both crayfishes and ghost shrimps. The most parsimonious explanation of the observed scenario is that astacid-thalassinid diversification happened in fluvial environments between the Carboniferous and Early Permian, while ghost shrimps invaded marine environments at the Permian-Triassic boundary. In addition, ichnonetwork analysis revealed that the ichnological system simplified across the Permian-Triassic boundary, accounting for a structured Permian ecosystem and fragmented, stressed habitats during the Early Triassic. This scenario is explained by a progressive drying trend that dramatically changed the hydrological features across the Permian-Triassic boundary. This supports the crucial role of global warming in driving the end-Permian crisis and its prolonged recovery. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69509
Appears in Collections: 过去全球变化的重建
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作者单位: Università di Milano, Dipartimento di Scienze della Terra, Milano, Italy; UNESCO Geopark Meseta Meridional, Geology and Paleontology Office, Idanha-a-Nova, Portugal; Dipartimento di Scienze della Terra e dell'Ambiente, Università di Pavia, V. Ferrata 1, Pavia, Italy
Recommended Citation:
Baucon A.,Ronchi A.,Felletti F.,et al. Evolution of Crustaceans at the edge of the end-Permian crisis: Ichnonetwork analysis of the fluvial succession of Nurra (Permian-Triassic, Sardinia, Italy)[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,410(1)