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Ancient tropical extinctions at high latitudes contributed to the latitudinal diversity gradient.
Evolution. 2020 09; 74(9):1966-1987.E

Abstract

Global biodiversity currently peaks at the equator and decreases toward the poles. Growing fossil evidence suggest this hump-shaped latitudinal diversity gradient (LDG) has not been persistent through time, with similar diversity across latitudes flattening out the LDG during past greenhouse periods. However, when and how diversity declined at high latitudes to generate the modern LDG remains an open question. Although diversity-loss scenarios have been proposed, they remain mostly undemonstrated. We outline the "asymmetric gradient of extinction and dispersal" framework that contextualizes previous ideas behind the LDG under a time-variable scenario. Using phylogenies and fossils of Testudines, Crocodilia, and Lepidosauria, we find that the hump-shaped LDG could be explained by (1) disproportionate extinctions of high-latitude tropical-adapted clades when climate transitioned from greenhouse to icehouse, and (2) equator-ward biotic dispersals tracking their climatic preferences when tropical biomes became restricted to the equator. Conversely, equivalent diversification rates across latitudes can account for the formation of an ancient flat LDG. The inclusion of fossils in macroevolutionary studies allows revealing time-dependent extinction rates hardly detectable from phylogenies only. This study underscores that the prevailing evolutionary processes generating the LDG during greenhouses differed from those operating during icehouses.

Authors+Show Affiliations

INRA, UMR 1062 Centre de Biologie pour la Gestion des Populations (INRA | IRD | CIRAD | Montpellier SupAgro), Montferrier-sur-Lez, France. CNRS, UMR 5554 Institut des Sciences de l'Evolution de Montpellier (Université de Montpellier | CNRS | IRD | EPHE), Montpellier, France. Real Jardín Botánico de Madrid (RJB-CSIC), Madrid, Spain.CNRS, UMR 5554 Institut des Sciences de l'Evolution de Montpellier (Université de Montpellier | CNRS | IRD | EPHE), Montpellier, France.

Pub Type(s)

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

Language

eng

PubMed ID

32246727

Citation

S Meseguer, Andrea, and Fabien L. Condamine. "Ancient Tropical Extinctions at High Latitudes Contributed to the Latitudinal Diversity Gradient." Evolution; International Journal of Organic Evolution, vol. 74, no. 9, 2020, pp. 1966-1987.
S Meseguer A, Condamine FL. Ancient tropical extinctions at high latitudes contributed to the latitudinal diversity gradient. Evolution. 2020;74(9):1966-1987.
S Meseguer, A., & Condamine, F. L. (2020). Ancient tropical extinctions at high latitudes contributed to the latitudinal diversity gradient. Evolution; International Journal of Organic Evolution, 74(9), 1966-1987. https://doi.org/10.1111/evo.13967
S Meseguer A, Condamine FL. Ancient Tropical Extinctions at High Latitudes Contributed to the Latitudinal Diversity Gradient. Evolution. 2020;74(9):1966-1987. PubMed PMID: 32246727.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Ancient tropical extinctions at high latitudes contributed to the latitudinal diversity gradient. AU - S Meseguer,Andrea, AU - Condamine,Fabien L, Y1 - 2020/04/18/ PY - 2019/04/15/received PY - 2020/03/04/revised PY - 2020/03/21/accepted PY - 2020/4/5/pubmed PY - 2021/7/24/medline PY - 2020/4/5/entrez KW - Biodiversity KW - Holarctic KW - climate change KW - extinction KW - fossils KW - tropics SP - 1966 EP - 1987 JF - Evolution; international journal of organic evolution JO - Evolution VL - 74 IS - 9 N2 - Global biodiversity currently peaks at the equator and decreases toward the poles. Growing fossil evidence suggest this hump-shaped latitudinal diversity gradient (LDG) has not been persistent through time, with similar diversity across latitudes flattening out the LDG during past greenhouse periods. However, when and how diversity declined at high latitudes to generate the modern LDG remains an open question. Although diversity-loss scenarios have been proposed, they remain mostly undemonstrated. We outline the "asymmetric gradient of extinction and dispersal" framework that contextualizes previous ideas behind the LDG under a time-variable scenario. Using phylogenies and fossils of Testudines, Crocodilia, and Lepidosauria, we find that the hump-shaped LDG could be explained by (1) disproportionate extinctions of high-latitude tropical-adapted clades when climate transitioned from greenhouse to icehouse, and (2) equator-ward biotic dispersals tracking their climatic preferences when tropical biomes became restricted to the equator. Conversely, equivalent diversification rates across latitudes can account for the formation of an ancient flat LDG. The inclusion of fossils in macroevolutionary studies allows revealing time-dependent extinction rates hardly detectable from phylogenies only. This study underscores that the prevailing evolutionary processes generating the LDG during greenhouses differed from those operating during icehouses. SN - 1558-5646 UR - https://www.unboundmedicine.com/medline/citation/32246727/Ancient_tropical_extinctions_at_high_latitudes_contributed_to_the_latitudinal_diversity_gradient_ L2 - https://doi.org/10.1111/evo.13967 DB - PRIME DP - Unbound Medicine ER -