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Does migration promote or inhibit diversification? A case study involving the dominant radiation of temperate Southern Hemisphere freshwater fishes

Citation

Burridge, CP and Waters, JM, Does migration promote or inhibit diversification? A case study involving the dominant radiation of temperate Southern Hemisphere freshwater fishes, Evolution, 74, (9) pp. 1954-1965. ISSN 0014-3820 (2020) [Refereed Article]

Copyright Statement

2020 The Authors. Evolution 2020 The Society for the Study of Evolution

DOI: doi:10.1111/evo.14066

Abstract

Although theory predicts that dispersal has a pivotal influence on speciation and extinction rates, it can have contradictory effects on each, such that empirical quantification of its role is required. In many studies, dispersal reduction appears to promote diversification, although some comparisons of migratory and nonmigratory species suggest otherwise. We tested for a relationship between migratory status and diversification rate within the dominant radiation of temperate Southern Hemisphere freshwater fishes, the Galaxiidae. We reconstructed a molecular phylogeny comprising >95% of extant taxa, and applied State-dependent Speciation Extinction models to estimate speciation, extinction, and diversification rates. In contrast to some previous studies, we revealed higher diversification rates in nonmigratory lineages. The reduced gene flow experienced by nonmigratory galaxiids appears to have increased diversification under conditions of allopatry or local adaptation. Migratory galaxiid lineages, by contrast, are genetically homogeneous within landmasses, but may also be rarely able to diversify by colonizing other landmasses in the temperate Southern Hemisphere. Apparent contradictions among studies of dispersal-diversification relationships may be explained by the spatial context of study systems relative to species dispersal abilities, by means of the "intermediate dispersal" model; the accurate quantification of dispersal abilities will aid in the understanding of these proposed interactions.

Item Details

Item Type:Refereed Article
Keywords:anadromy, diadromy, diversification, gene flow, intermediate dispersal, river capture
Research Division:Biological Sciences
Research Group:Evolutionary biology
Research Field:Speciation and extinction
Objective Division:Environmental Management
Objective Group:Fresh, ground and surface water systems and management
Objective Field:Fresh, ground and surface water biodiversity
UTAS Author:Burridge, CP (Associate Professor Christopher Burridge)
ID Code:141046
Year Published:2020
Web of Science® Times Cited:2
Deposited By:Zoology
Deposited On:2020-09-21
Last Modified:2020-10-27
Downloads:0

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