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Title: Temporal dynamics of the geographic differentiation of Late Devonian palmatolepis assemblages in the Prototethys
Authors: Girard, Catherine
Phuong, Ta Hoa
Print | E-mail Scopus - Author details - Renaud, Sabrina
Keywords: Conodonta;Frasnian/Famennian;geographic differentiation;mass extinction;morphometrics;Prototethys;Indexed keywords
Issue Date: 2010
Publisher: H. : ĐHQGHN
Abstract: Throughout their history, species had to face environmental variations spatially and temporally. How both levels of variation interact will be of key importance in conditioning their response to major perturbations. We addressed this question by focusing on a period in Earth's history marked by dramatic environmental and faunal changes, the Late Devonian Frasnian/Famennian boundary. From a paleogeographic point of view, this period is characterized by a cosmopolitanism of the faunas across a large ocean, the Prototethys. We considered the biotic reaction at a seldom considered scale, namely within a single subgenus of conodont, Palmatulepis (Manticolepis). Patterns of spatial and temporal differentiation were quantified using morphometrics of its platform element. The recognized cosmopolitanism of the faunas was confirmed at this scale of variation since temporal records gathered in distant areas around the Prototethys, including the seldom documented regions located nowadays in South-East Asia, displayed similar morphological trends in response to the major F/F crisis. Beyond this overall cosmopolitanism, subtle geographic structure was evidenced but was not stable through time. Geographic differentiation was maximal shortly before the F/F crisis, suggesting that despite high sea-level, tectonics leaded to complex submarine landscapes promoting differentiation. In contrast any geographic structure was swamped out after the crisis, possibly due to a global recolonization from few favorable patches.
Description: Acta Palaeontologica Polonica Volume 55, Issue 4, December 2010, Pages 675-687
ISSN: 05677920
Appears in Collections:Bài báo của ĐHQGHN trong Scopus

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