Graptolite community responses to global climate change and the late ordovician mass extinction

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F16%3A00461649" target="_blank" >RIV/67985831:_____/16:00461649 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1073/pnas.1602102113" target="_blank" >http://dx.doi.org/10.1073/pnas.1602102113</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1073/pnas.1602102113" target="_blank" >10.1073/pnas.1602102113</a>

Result language

angličtina

Original language name

Graptolite community responses to global climate change and the late ordovician mass extinction

Original language description

Mass extinctions disrupt ecological communities. Although climate changes produce stress in ecological communities, few paleobiological studies have systematically addressed the impact of global climate changes on the fine details of community structure with a view to understanding how changes in community structure presage, or even cause, biodiversity decline during mass extinctions. Based on a novel Bayesian approach to biotope assessment, we present a study of changes in species abundance distribution patterns of macroplanktonic graptolite faunas (∼447-444 Ma) leading into the Late Ordovician mass extinction. Communities at two contrasting sites exhibit significant decreases in complexity and evenness as a consequence of the preferential decline in abundance of dysaerobic zone specialist species. The observed changes in community complexity and evenness commenced well before the dramatic population depletions that mark the tipping point of the extinction event. Initially, community changes tracked changes in the oceanic water masses, but these relations broke down during the onset of mass extinction. Environmental isotope and biomarker data suggest that sea surface temperature and nutrient cycling in the paleotropical oceans changed sharply during the latest Katian time, with consequent changes in the extent of the oxygen minimum zone and phytoplankton community composition. Although many impacted species persisted in ephemeral populations, increased extinction risk selectively depleted the diversity of paleotropical graptolite species during the latest Katian and early Hirnantian. The effects of long- Term climate change on habitats can thus degrade populations in ways that cascade through communities, with effects that culminate in mass extinction.

Czech name

—

Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

DB - Geology and mineralogy

OECD FORD branch

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Project

<a href="/en/project/IAA301110908" target="_blank" >IAA301110908: Dynamics of the Upper Ordovician climax-stage faunal assemblages before global crisis controlled by climatic changes: a record from the Králův Dvůr Formation of the Barrandian area</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Proceedings of the National Academy of Sciences of the United States of America

ISSN

0027-8424

e-ISSN

—

Volume of the periodical

113

Issue of the periodical within the volume

30

Country of publishing house

US - UNITED STATES

Number of pages

6

Pages from-to

8380-8385

UT code for WoS article

000380346200034

EID of the result in the Scopus database

2-s2.0-84979703515