UCL logo

UCL Discovery

UCL home » Library Services » Electronic resources » UCL Discovery

Evolutionarily distinct “living fossils” require both lower speciation and lower extinction rates

Bennett, DJ; Sutton, MD; Turvey, ST; (2016) Evolutionarily distinct “living fossils” require both lower speciation and lower extinction rates. Paleobiology , 43 (1) pp. 34-48. 10.1017/pab.2016.36. Green open access

[img]
Preview
Text
Turvey_manuscript.pdf

Download (441kB) | Preview
[img]
Preview
Image
Bennetetal_Figure_1_1col.tiff - ["content_typename_Accepted version" not defined]

Download (3MB) | Preview
[img]
Preview
Image
Bennettetal_Figure_2_2col.jpg - ["content_typename_Accepted version" not defined]

Download (660kB) | Preview
[img]
Preview
Image
Bennettetal_Figure_3_2col.jpg - ["content_typename_Accepted version" not defined]

Download (761kB) | Preview
[img]
Preview
Image
Bennettetal_Figure_4_2col.jpg - ["content_typename_Accepted version" not defined]

Download (546kB) | Preview
[img]
Preview
Image
Bennettetal_Figure_5_2col.jpg - ["content_typename_Accepted version" not defined]

Download (1MB) | Preview
[img]
Preview
Image
Bennettetal_Figure_6_1col.jpg - ["content_typename_Accepted version" not defined]

Download (337kB) | Preview
[img]
Preview
Text
SupportingInformation.pdf - ["content_typename_Accepted version" not defined]

Download (1MB) | Preview
[img] Spreadsheet
tables.xlsx - ["content_typename_Accepted version" not defined]

Download (11kB)

Abstract

As a label for a distinct category of life, “living fossil” is controversial. The term has multiple definitions, and it is unclear whether the label can be genuinely used to delimit biodiversity. Even taking a purely phylogenetic perspective in which a proxy for the living fossil is evolutionary distinctness (ED), an inconsistency arises: Does it refer to “dead-end” lineages doomed to extinction or “panchronic” lineages that survive through multiple epochs? Recent tree-growth model studies indicate that speciation rates must have been unequally distributed among species in the past to produce the shape of the tree of life. Although an uneven distribution of speciation rates may create the possibility for a distinct group of living fossil lineages, such a grouping could only be considered genuine if extinction rates also show a consistent pattern, be it indicative of dead-end or panchronic lineages. To determine whether extinction rates also show an unequal distribution, we developed a tree-growth model in which the probability of speciation and extinction is a function of a tip’s ED. We simulated thousands of trees in which the ED function for a tip is randomly and independently determined for speciation and extinction rates. We find that simulations in which the most evolutionarily distinct tips have lower rates of speciation and extinction produce phylogenetic trees closest in shape to empirical trees. This implies that a distinct set of lineages with reduced rates of diversification, indicative of a panchronic definition, is required to create the shape of the tree of life.

Type: Article
Title: Evolutionarily distinct “living fossils” require both lower speciation and lower extinction rates
Open access status: An open access version is available from UCL Discovery
DOI: 10.1017/pab.2016.36
Publisher version: http://doi.org/10.1017/pab.2016.36
Language: English
Additional information: © 2016 The Paleontological Society. All rights reserved
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences
URI: http://discovery.ucl.ac.uk/id/eprint/1508202
Downloads since deposit
190Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item