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Bibliographic record number: 491293

Journal

Authors: Young, Jeremy R.; Hagino, Kyoko; Bown, Paul R.; Godrijan, Jelena
Title: Coastal coccolithophores and K/T boundary
Source: INA13 Abstract Volume
Meeting: 13th International Nannoplankton Association Conference
Location and date: Yamagata, Japan, 5-10 September 2010
Keywords: coccolithophores; coastal; K/T boundary; plankton
Abstract:
The catastrophic global change events which occurred at and after the Cretaceous/Palaeogene boundary event resulted in extinction of ca. 90% of the nannoflora. Equally remarkably the relatively few survivor species were almost universally rare in the preceding Late Cretaceous assemblages. Almost all the typical oceanic species appear to have gone extinct abruptly including many species and genera with long geological ranges Watznaueria barnesiae, Arkhangelskiella cymbiformis Prediscosphaera cretacea and Cribrosphaerella ehrenbergii. By contrast typical survivor species such as Braarudosphaera bigelowii and Goniolithus fluckigera were only sporadically present in typical Late Cretaceous assemblages. This pattern and analysis of the possible ecological affinities of the survivor and incoming species lead Bown (2005) to speculate that coastal adaptation may have been a key factor in allowing survival. Likewise Medlin et al. (2008) used molecular clock evidence to argue that the modern neritic coccolithophore Cruciplacolithus neohelis may be the direct descendant of the morphologically identical early Palaeocene species Cruciplacolithus primus. They further argued that the absence of any bottlenecking in the molecular phylogeny of the predominantly coastal non-calcifying Chrysochromulina species provided further evidence for the K/Pg extinctions primarily affecting the oceanic coccolithophores. New data from extant coastal coccolithophores collected from Totori Port in Japan and the Rovinj Marine station in Croatia combined with observations on exceptionally preserved fossil samples from Tanzania provide remarkable new support for this hypothesis. Finally, review of data from calcareous dinoflagellates and planktonic foraminifera indicate that oceanic extinctions and coastal survivorship was probably a universal pattern among calcareous plankton.
Type of meeting: Predavanje
Type of presentation in a journal: Abstract
Type of peer-review: International peer-review
Project / theme: 098-0982705-2731
Original language: ENG
Category: Znanstveni
Research fields:
Geology
Contrib. to CROSBI by: jgodrij@irb.hr (jgodrij@irb.hr), 15. Stu. 2010. u 13:15 sati



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