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Tracking taphonomic regimes using chemical and mechanical damage of pollen and spores: an example from the Triassic-Jurassic mass extinction.
PLoS One. 2012; 7(11):e49153.Plos

Abstract

The interpretation of biotic changes in the geological past relies on the assumption that samples from different time intervals represent an equivalent suite of natural sampling conditions. As a result, detailed investigations of taphonomic regimes during intervals of major biotic upheaval, such as mass extinctions, are crucial. In this paper, we have used variations in the frequency of chemical and mechanical sporomorph (pollen and spore) damage as a guide to taphonomic regimes across the Triassic-Jurassic mass extinction (Tr-J; ∼201.3 Ma) at a boundary section at Astartekløft, East Greenland. We find that the frequency of sporomorph damage is extremely variable in samples from this locality. This likely reflects a combination of taxon-specific susceptibility to damage and the mixing of sporomorphs from a mosaic of environments and taphonomic regimes. The stratigraphic interval containing evidence of plant extinction and compositional change in the source vegetation at Astartekløft is not marked by a consistent rise or fall in the frequency of sporomorph damage. This indicates that natural taphonomic regimes did not shift radically during this critical interval. We find no evidence of a consistent relationship between the taxonomic richness of sporomorph assemblages and the frequency of damage among sporomorphs at Astartekløft. This indicates that previously reported patterns of sporomorph richness across the Tr-J at this locality are likely to be robust. Taken together, our results suggest that the patterns of vegetation change at Astartekløft represent a real biological response to environmental change at the Tr-J.

Authors+Show Affiliations

Department of Plant Biology, University of Illinois, Urbana, Illinois, United States of America. luke.mander@gmail.comNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

23145104

Citation

Mander, Luke, et al. "Tracking Taphonomic Regimes Using Chemical and Mechanical Damage of Pollen and Spores: an Example From the Triassic-Jurassic Mass Extinction." PloS One, vol. 7, no. 11, 2012, pp. e49153.
Mander L, Wesseln CJ, McElwain JC, et al. Tracking taphonomic regimes using chemical and mechanical damage of pollen and spores: an example from the Triassic-Jurassic mass extinction. PLoS ONE. 2012;7(11):e49153.
Mander, L., Wesseln, C. J., McElwain, J. C., & Punyasena, S. W. (2012). Tracking taphonomic regimes using chemical and mechanical damage of pollen and spores: an example from the Triassic-Jurassic mass extinction. PloS One, 7(11), e49153. https://doi.org/10.1371/journal.pone.0049153
Mander L, et al. Tracking Taphonomic Regimes Using Chemical and Mechanical Damage of Pollen and Spores: an Example From the Triassic-Jurassic Mass Extinction. PLoS ONE. 2012;7(11):e49153. PubMed PMID: 23145104.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Tracking taphonomic regimes using chemical and mechanical damage of pollen and spores: an example from the Triassic-Jurassic mass extinction. AU - Mander,Luke, AU - Wesseln,Cassandra J, AU - McElwain,Jennifer C, AU - Punyasena,Surangi W, Y1 - 2012/11/07/ PY - 2012/05/26/received PY - 2012/10/09/accepted PY - 2012/11/13/entrez PY - 2012/11/13/pubmed PY - 2013/5/25/medline SP - e49153 EP - e49153 JF - PloS one JO - PLoS ONE VL - 7 IS - 11 N2 - The interpretation of biotic changes in the geological past relies on the assumption that samples from different time intervals represent an equivalent suite of natural sampling conditions. As a result, detailed investigations of taphonomic regimes during intervals of major biotic upheaval, such as mass extinctions, are crucial. In this paper, we have used variations in the frequency of chemical and mechanical sporomorph (pollen and spore) damage as a guide to taphonomic regimes across the Triassic-Jurassic mass extinction (Tr-J; ∼201.3 Ma) at a boundary section at Astartekløft, East Greenland. We find that the frequency of sporomorph damage is extremely variable in samples from this locality. This likely reflects a combination of taxon-specific susceptibility to damage and the mixing of sporomorphs from a mosaic of environments and taphonomic regimes. The stratigraphic interval containing evidence of plant extinction and compositional change in the source vegetation at Astartekløft is not marked by a consistent rise or fall in the frequency of sporomorph damage. This indicates that natural taphonomic regimes did not shift radically during this critical interval. We find no evidence of a consistent relationship between the taxonomic richness of sporomorph assemblages and the frequency of damage among sporomorphs at Astartekløft. This indicates that previously reported patterns of sporomorph richness across the Tr-J at this locality are likely to be robust. Taken together, our results suggest that the patterns of vegetation change at Astartekløft represent a real biological response to environmental change at the Tr-J. SN - 1932-6203 UR - https://www.unboundmedicine.com/medline/citation/23145104/Tracking_taphonomic_regimes_using_chemical_and_mechanical_damage_of_pollen_and_spores:_an_example_from_the_Triassic_Jurassic_mass_extinction_ L2 - http://dx.plos.org/10.1371/journal.pone.0049153 DB - PRIME DP - Unbound Medicine ER -