Non-congruent fossil and phylogenetic evidence on the evolution of climatic niche in the Gondwana genus Nothofagus
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 authorAurora 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 authorMaría 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 authorFrancy Carvajal
Facultad de Ciencias, Universidad de Chile, Santiago, Chile
Instituto de Ecología y Biodiversidad (IEB), Santiago, Chile
Search for more papers by this authorMaría Francisca Campano
Facultad de Ciencias, Universidad de Chile, Santiago, Chile
Instituto de Ecología y Biodiversidad (IEB), Santiago, Chile
Search for more papers by this authorMirta Quattrocchio
Departamento de Geología, Universidad Nacional del Sur, Bahía Blanca, Argentina
Search for more papers by this authorHarufumi Nishida
Department of Biological Sciences, Chuo University, Tokyo, Japan
Search for more papers by this authorKazuhiko Uemura
Department of Geology and Palaeontology, National Museum of Nature and Science, Tsukuba, Japan
Search for more papers by this authorAtsushi Yabe
Department of Geology and Palaeontology, National Museum of Nature and Science, Tsukuba, Japan
Search for more papers by this authorRamiro Bustamante
Facultad de Ciencias, Universidad de Chile, Santiago, Chile
Instituto de Ecología y Biodiversidad (IEB), Santiago, Chile
Search for more papers by this authorMary 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 authorCorresponding 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 authorAurora 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 authorMaría 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 authorFrancy Carvajal
Facultad de Ciencias, Universidad de Chile, Santiago, Chile
Instituto de Ecología y Biodiversidad (IEB), Santiago, Chile
Search for more papers by this authorMaría Francisca Campano
Facultad de Ciencias, Universidad de Chile, Santiago, Chile
Instituto de Ecología y Biodiversidad (IEB), Santiago, Chile
Search for more papers by this authorMirta Quattrocchio
Departamento de Geología, Universidad Nacional del Sur, Bahía Blanca, Argentina
Search for more papers by this authorHarufumi Nishida
Department of Biological Sciences, Chuo University, Tokyo, Japan
Search for more papers by this authorKazuhiko Uemura
Department of Geology and Palaeontology, National Museum of Nature and Science, Tsukuba, Japan
Search for more papers by this authorAtsushi Yabe
Department of Geology and Palaeontology, National Museum of Nature and Science, Tsukuba, Japan
Search for more papers by this authorRamiro Bustamante
Facultad de Ciencias, Universidad de Chile, Santiago, Chile
Instituto de Ecología y Biodiversidad (IEB), Santiago, Chile
Search for more papers by this authorMary 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 authorAbstract
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.
Supporting Information
Filename | Description |
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jbi12650-sup-0001-SupInfo.docxWord document, 2.6 MB | Appendix S1 Systematic descriptions of the fossils. Appendix S2 Fossil pollen assemblage and weighted mean values of bioclimatic variables. |
Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.
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