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Table 1 Effects of hemisphere of origin (northern versus southern) and taxonomic class (Mammalia, Aves, Amphibia, Reptilia, Actinopterygii) on intraspecific estimates of species ages from temperate-regions across the globe

From: Disparity in the timing of vertebrate diversification events between the northern and southern hemispheres

Variable

Likelihood ratio (D)

P

(a) Complete dataset

  

Hemisphere

D = 14.2

< 0.001

Taxonomic class

D = 28.8

< 0.0001

Hemisphere * Taxonomic class

D = 1.72

0.786

(b) High-latitude species

  

Hemisphere

D = 10.5

0.00120

Taxonomic class

D = 15.0

0.00190

Hemisphere * Taxonomic class

D = 2.14

0.544

(c) Low-latitude species

  

Hemisphere

D = 9.62

0.00190

Taxonomic class

D = 63.5

< 0.0001

Hemisphere * Taxonomic class

D = 7.17

0.127

  1. Results are shown for the entire dataset (a), for the subset of species that are distributed above 40° N or S (b), and for the subset of species that are distributed between the tropics and 40° N or S (c). Likelihood ratio tests were conducted between nested models that included and excluded each variable; however, main effects were tested for significance only after excluding the interaction term.
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BMC Ecology and Evolution

ISSN: 2730-7182

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