MESSAGE
| DATE | 2016-11-09 |
| FROM | Ruben Safir
|
| SUBJECT | Subject: [Learn] Fwd: [dinosaur] Dating origins of dinosaurs,
|
From learn-bounces-at-nylxs.com Wed Nov 9 21:19:50 2016
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Subject: [Learn] Fwd: [dinosaur] Dating origins of dinosaurs,
avian flight and crown birds (free pdf)
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-------- Forwarded Message --------
Subject: [dinosaur] Dating origins of dinosaurs, avian flight and crown
birds (free pdf)
Date: Wed, 9 Nov 2016 09:16:34 -0800
From: Ben Creisler
Reply-To: Ben Creisler
To: dinosaur-l-at-usc.edu
Ben Creisler
bcreisler-at-gmail.com
A new paper in open access:
G. T. Lloyd, D. W. Bapst, M. Friedman & K. E. Davis (2016)
Probabilistic divergence time estimation without branch lengths: dating the
origins of dinosaurs, avian flight and crown birds.
DOI: 10.1098/rsbl.2016.0609
https://urldefense.proofpoint.com/v2/url?u=3Dhttp-3A__rsbl.royalsocietypubl=
ishing.org_content_12_11_20160609&d=3DDgIFaQ&c=3DclK7kQUTWtAVEOVIgvi0NU5BOU=
HhpN0H8p7CSfnc_gI&r=3DRy_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=3DvlWI4=
SsfIadXl_dRE6MjMB_jxGrO2xWrTtlko9KmpA0&s=3DmucKRuUZ4rzVcYksve2Z_SzPZAIHNavT=
VOYbmfMiqQU&e=3D
Free pdf:
https://urldefense.proofpoint.com/v2/url?u=3Dhttp-3A__rsbl.royalsocietypubl=
ishing.org_content_roybiolett_12_11_20160609.full.pdf&d=3DDgIFaQ&c=3DclK7kQ=
UTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=3DRy_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z=
1CYJgFW9SI&m=3DvlWI4SsfIadXl_dRE6MjMB_jxGrO2xWrTtlko9KmpA0&s=3D0PvXcqmLLFN9=
3q0VPYhKjDo_PfMGmXlTgq1ZoEfG1uA&e=3D
Branch lengths=E2=80=94measured in character changes=E2=80=94are an essenti=
al requirement
of clock-based divergence estimation, regardless of whether the fossil
calibrations used represent nodes or tips. However, a separate set of
divergence time approaches are typically used to date palaeontological
trees, which may lack such branch lengths. Among these methods,
sophisticated probabilistic approaches have recently emerged, in contrast
with simpler algorithms relying on minimum node ages. Here, using a novel
phylogenetic hypothesis for Mesozoic dinosaurs, we apply two such
approaches to estimate divergence times for: (i) Dinosauria, (ii) Avialae
(the earliest birds) and (iii) Neornithes (crown birds). We find: (i) the
plausibility of a Permian origin for dinosaurs to be dependent on whether
Nyasasaurus is the oldest dinosaur, (ii) a Middle to Late Jurassic origin
of avian flight regardless of whether Archaeopteryx or Aurornis is
considered the first bird and (iii) a Late Cretaceous origin for Neornithes
that is broadly congruent with other node- and tip-dating estimates.
Demonstrating the feasibility of probabilistic time-scaling further opens
up divergence estimation to the rich histories of extinct biodiversity in
the fossil record, even in the absence of detailed character data.
***
News:
https://urldefense.proofpoint.com/v2/url?u=3Dhttp-3A__phys.org_news_2016-2D=
11-2Dbiggest-2Ddinosaur-2Dtree-2Demerged-2Dmillion.html&d=3DDgIFaQ&c=3DclK7=
kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=3DRy_mO4IFaUmGof_Yl9MyZgecRCKHn5g=
4z1CYJgFW9SI&m=3DvlWI4SsfIadXl_dRE6MjMB_jxGrO2xWrTtlko9KmpA0&s=3Dn-h0woWvs0=
SgSZRlEenR9sShYLLquv3ztekoZ541S0M&e=3D
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