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The plankton turnover at the Permo-Triassic boundary, emphasis on radiolarians

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Part of the book series: Eclogae Geologicae Helvetiae Supplement ((SWISSGEO,volume 2))

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Abstract

The examination of plankton biodiversity through Permian-Triassic period seems to display different patterns of evolution depending of the scale of study (taxonomy stratigraphy or biogeography). In this paper we present the state of the art of the plankton turnover at the Permo-Triassic and we review more precisely the pattern of extinction and recovery of radiolarians during such period, because at that time, plankton was essentially represented by radiolarians. At a global scale the end-Permian to early Triassic period is marked by several strong extinctions in the marine realm, and in the radiolarians they occur progressively as exemplified by two orders of radiolarians: Albaillelaria and Latentifistularia. Nevertheless, this period is marked by a tremendous post-crisis diversification in both at family and generic level, more than extinction; an actualized revision of the diversity at the family level is also offered in our review. At a moderate scale (i.e. genera and in a region) the modifications appear impressive while at specific and regional domain the message is not so clear, one can wonder if some crisis manifestation results from a taxonomic accident or from preservative conditions. In fact, strangely enough more the number of studies is, more the diversity is high, and oppositely less they are, more the provincialism is evoked.

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Peter O. Baumgartner Jonathan C. Aitchison Patrick De Wever Sarah-Jane Jackett

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Wever, P., O’Dogherty, L., Gorican, S. (2007). The plankton turnover at the Permo-Triassic boundary, emphasis on radiolarians. In: Baumgartner, P.O., Aitchison, J.C., De Wever, P., Jackett, SJ. (eds) Radiolaria. Eclogae Geologicae Helvetiae Supplement, vol 2. Birkhäuser, Basel. https://doi.org/10.1007/978-3-7643-8344-2_4

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