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What can multiple phylogenies say about the latitudinal diversity gradient?: a new look at the tropical conservatism, out of the tropics, and diversification rate hypotheses
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
2013 (English)In: Evolution, ISSN 0014-3820, E-ISSN 1558-5646, Vol. 67, no 6, 1741-1755 p.Article in journal (Refereed) Published
Abstract [en]

We reviewed published phylogenies and selected 111 phylogenetic studies representing mammals, birds, insects, and flowering plants. We then mapped the latitudinal range of all taxa to test the relative importance of the tropical conservatism, out of the tropics, and diversification rate hypotheses in generating latitudinal diversity gradients. Most clades originated in the tropics, with diversity peaking in the zone of origin. Transitions of lineages between latitudinal zones occurred at 16-22% of the tree nodes. The most common type of transition was range expansions of tropical lineages to encompass also temperate latitudes. Thus, adaptation to new climatic conditions may not represent a major obstacle for many clades. These results contradict predictions of the tropical conservatism hypothesis (i.e., few clades colonizing extratropical latitudes), but support the out-of-the-tropics model (i.e., tropical originations and subsequent latitudinal range expansions). Our results suggest no difference in diversification between tropical and temperate sister lineages; thus, diversity of tropical clades was not explained by higher diversification rates in this zone. Moreover, lineages with latitudinal stasis diversified more compared to sister lineages entering a new latitudinal zone. This preserved preexisting diversity differences between latitudinal zones and can be considered a new mechanism for why diversity tends to peak in the zone of origin.

Place, publisher, year, edition, pages
2013. Vol. 67, no 6, 1741-1755 p.
Keyword [en]
Ancestral area reconstruction, evolutionary time, latitudinal zone transitions, sister-group analysis, tropical origination
National Category
Evolutionary Biology
Identifiers
URN: urn:nbn:se:umu:diva-76789DOI: 10.1111/evo.12089ISI: 000319874800018OAI: oai:DiVA.org:umu-76789DiVA: diva2:637157
Available from: 2013-07-16 Created: 2013-07-15 Last updated: 2017-12-06Bibliographically approved

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Jansson, RolandRodriguez-Castaneda, Genoveva

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