Volume 43, Issue 3 pp. 555-567
Original Article

Non-congruent fossil and phylogenetic evidence on the evolution of climatic niche in the Gondwana genus Nothofagus

Luis Felipe Hinojosa

Corresponding Author

Luis Felipe Hinojosa

Facultad de Ciencias, Universidad de Chile, Santiago, Chile

Instituto de Ecología y Biodiversidad (IEB), Santiago, Chile

Correspondence: Luis Felipe Hinojosa, Facultad de Ciencias Universidad de Chile & Instituto de Ecología y Biodiversidad (IEB), Santiago, Chile.

E-mail: [email protected]

Search for more papers by this author
Aurora Gaxiola

Aurora Gaxiola

Instituto de Ecología y Biodiversidad (IEB), Santiago, Chile

Departamento de Ecología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile

Search for more papers by this author
María Fernanda Pérez

María Fernanda Pérez

Instituto de Ecología y Biodiversidad (IEB), Santiago, Chile

Departamento de Ecología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile

Search for more papers by this author
Francy Carvajal

Francy Carvajal

Facultad de Ciencias, Universidad de Chile, Santiago, Chile

Instituto de Ecología y Biodiversidad (IEB), Santiago, Chile

Search for more papers by this author
María Francisca Campano

María Francisca Campano

Facultad de Ciencias, Universidad de Chile, Santiago, Chile

Instituto de Ecología y Biodiversidad (IEB), Santiago, Chile

Search for more papers by this author
Mirta Quattrocchio

Mirta Quattrocchio

Departamento de Geología, Universidad Nacional del Sur, Bahía Blanca, Argentina

Search for more papers by this author
Harufumi Nishida

Harufumi Nishida

Department of Biological Sciences, Chuo University, Tokyo, Japan

Search for more papers by this author
Kazuhiko Uemura

Kazuhiko Uemura

Department of Geology and Palaeontology, National Museum of Nature and Science, Tsukuba, Japan

Search for more papers by this author
Atsushi Yabe

Atsushi Yabe

Department of Geology and Palaeontology, National Museum of Nature and Science, Tsukuba, Japan

Search for more papers by this author
Ramiro Bustamante

Ramiro Bustamante

Facultad de Ciencias, Universidad de Chile, Santiago, Chile

Instituto de Ecología y Biodiversidad (IEB), Santiago, Chile

Search for more papers by this author
Mary T. K. Arroyo

Mary T. K. Arroyo

Facultad de Ciencias, Universidad de Chile, Santiago, Chile

Instituto de Ecología y Biodiversidad (IEB), Santiago, Chile

Search for more papers by this author
First published: 12 November 2015
Citations: 24
Editor: Peter Linder

Abstract

Aim

We used fossil and phylogenetic evidence to reconstruct climatic niche evolution in Nothofagus, a Gondwana genus distributed in tropical and temperate latitudes. To assess whether the modern distribution of the genus can be explained by the tropical conservatism hypothesis, we tested three predictions: (1) species from all Nothofagus subgenera coexisted under mesothermal climates during the early Eocene; (2) tolerance to microthermal climates evolved during the Eocene–Oligocene cooling from an ancestor that grew under mesothermal conditions; and (3) the climatic niche in Nothofagus is phylogenetically conserved.

Location

Australia, New Zealand, New Caledonia, Papua-New Guinea and South America.

Methods

We estimated the palaeoclimate of the Early Eocene, fossil-bearing Ligorio Marquez Formation (LMF, Chile), using coexistence and leaf physiognomic analysis. We reconstructed ancestral climatic niches of Nothofagus using extant species distributions and a time-calibrated phylogeny. Finally, we used the morphological disparity index and phylogenetic generalized least squares to assess whether climatic variables follow a Brownian motion (BM) or an Ornstein–Uhlenbeck (OU) model of evolution.

Results

Our palaeoclimatic estimates suggest mesothermal conditions for the LMF, where macrofossils associated with subgenera Lophozonia and possibly Fuscospora, and fossil pollen of Brassospora and Fuscospora/Nothofagus were recorded. These results are not supported by our phylogenetic analysis, which instead suggests that the ancestor of Nothofagus lived under microthermal to marginally mesothermal conditions, with tolerance to mesothermal conditions evolving only in the subgenus Brassospora. Precipitation and temperature dimensions of the realized climatic niche fit with a gradual BM or constrained OU model of evolution.

Main Conclusions

Our results suggest that the use of phylogenetic reconstruction methods based only on present distributions of extant taxa to infer ancestral climatic niches is likely to lead to erroneous results when climatic requirements of ancestors differ from their extant descendants, or when much extinction has occurred.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.