An inverse latitudinal gradient in speciation rate for marine fishes

Rabosky, Daniel L., Chang, Jonathan, Title, Pascal O., Cowman, Peter F., Sallan, Lauren, Friedman, Matt, Kaschner, Kristin, Garilao, Cristina, Near, Thomas J., Coll, Marta and Alfaro, Michael E. (2018) An inverse latitudinal gradient in speciation rate for marine fishes Nature . DOI 10.1038/s41586-018-0273-1.

[img] Text
Rabosky_etal2018.pdf - Published Version
Restricted to Registered users only

Download (8Mb) | Contact

Supplementary data:

Abstract

Far more species of organisms are found in the tropics than in temperate and polar regions, but the evolutionary and ecological causes of this pattern remain controversial1,2. Tropical marine fish communities are much more diverse than cold-water fish communities found at higher latitudes3,4, and several explanations for this latitudinal diversity gradient propose that warm reef environments serve as evolutionary ‘hotspots’ for species formation5,6,7,8. Here we test the relationship between latitude, species richness and speciation rate across marine fishes. We assembled a time-calibrated phylogeny of all ray-finned fishes (31,526 tips, of which 11,638 had genetic data) and used this framework to describe the spatial dynamics of speciation in the marine realm. We show that the fastest rates of speciation occur in species-poor regions outside the tropics, and that high-latitude fish lineages form new species at much faster rates than their tropical counterparts. High rates of speciation occur in geographical regions that are characterized by low surface temperatures and high endemism. Our results reject a broad class of mechanisms under which the tropics serve as an evolutionary cradle for marine fish diversity and raise new questions about why the coldest oceans on Earth are present-day hotspots of species formation.

Document Type: Article
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EV Evolutionary Ecology of Marine Fishes
Refereed: Yes
DOI etc.: 10.1038/s41586-018-0273-1
ISSN: 0028-0836
Related URLs:
Date Deposited: 05 Jul 2018 13:26
Last Modified: 05 Jul 2018 13:26
URI: http://eprints.uni-kiel.de/id/eprint/43583

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...