Origem antiga da fauna marinha profunda moderna
quinta-feira, outubro 11, 2012
Ancient Origin of the Modern Deep-Sea Fauna
Ben Thuy1*, Andy S. Gale2, Andreas Kroh3, Michal Kucera4, Lea D. Numberger-Thuy5, Mike Reich1,5, Sabine Stöhr6
1 Geoscience Centre,
University of Göttingen, Department of Geobiology, Göttingen, Germany, 2
School of Earth and Environmental Sciences, University of Portsmouth,
Portsmouth, United Kingdom, 3 Natural History Museum Vienna, Department
of Geology and Palaeontology, Vienna, Austria, 4 Marum – Centre for
Marine Environmental Sciences, University of Bremen, Bremen, Germany, 5
Geoscience Centre, Museum, Collections and Geopark, University of
Göttingen, Göttingen, Germany, 6 Swedish Museum of Natural History,
Stockholm, Sweden
Abstract
The origin and possible
antiquity of the spectacularly diverse modern deep-sea fauna has been
debated since the beginning of deep-sea research in the mid-nineteenth
century. Recent hypotheses, based on biogeographic patterns and
molecular clock estimates, support a latest Mesozoic or early Cenozoic
date for the origin of key groups of the present deep-sea fauna
(echinoids, octopods). This relatively young age is consistent with
hypotheses that argue for extensive extinction during Jurassic and
Cretaceous Oceanic Anoxic Events (OAEs) and the mid-Cenozoic cooling of
deep-water masses, implying repeated re-colonization by immigration of
taxa from shallow-water habitats. Here we report on a well-preserved
echinoderm assemblage from deep-sea (1000–1500 m paleodepth) sediments
of the NE-Atlantic of Early Cretaceous age (114 Ma).
The assemblage is
strikingly similar to that of extant bathyal echinoderm communities in
composition, including families and genera found exclusively in modern
deep-sea habitats. A number of taxa found in the assemblage have no
fossil record at shelf depths postdating the assemblage, which precludes
the possibility of deep-sea recolonization from shallow habitats
following episodic extinction at least for those groups.
Our discovery
provides the first key fossil evidence that a significant part of the
modern deep-sea fauna is considerably older than previously assumed. As a
consequence, most major paleoceanographic events had far less impact on
the diversity of deep-sea faunas than has been implied. It also
suggests that deep-sea biota are more resilient to extinction events
than shallow-water forms, and that the unusual deep-sea environment,
indeed, provides evolutionary stability which is very rarely punctuated
on macroevolutionary time scales.
Citation: Thuy B, Gale
AS, Kroh A, Kucera M, Numberger-Thuy LD, et al. (2012) Ancient Origin of
the Modern Deep-Sea Fauna. PLoS ONE 7(10): e46913.
doi:10.1371/journal.pone.0046913
Editor: Richard J. Butler, Ludwig-Maximilians-Universität München, Germany
Received: May 24, 2012; Accepted: September 6, 2012; Published: October 10, 2012
Copyright: © 2012 Thuy
et al. This is an open-access article distributed under the terms of the
Creative Commons Attribution License, which permits unrestricted use,
distribution, and reproduction in any medium, provided the original
author and source are credited.
Funding: The study was
funded by the German Research Foundation (http://www.dfg.de/index.jsp),
grant RE2599/6-1, and by the European Union funded Synthesys program
(http://www.synthesys.info/), grants SE-TAF-2674 and SE-TAF-2969.
Deposition of the described material in the collections of the Natural
History Museum in London (UK), the micropaleontological collection at
the University of Tübingen (D) and the Geoscientific Museum at the
University of Göttingen (D) was done with the permission of the
respective institutes.
We acknowledge support by the German Research
Foundation and the Open Access Publication Funds of the Göttingen
University. The funders had no role in study design, data collection and
analysis, decision to publish, or preparation of the manuscript.
Competing interests: The authors have declared that no competing interests exist.
* E-mail: nebyuht@yahoo.com
+++++
