Table 4

Andes-Amazon transitions for echimyid rodents, as numbered in Figures4and5
Transition Branch Time Origin Likelihood of stem ancestor’s range
Earliest (stem) Latest (crown) (and polarity)
Figure4
T1 Isothrix 13.3 (9.4, 17.5) 5.2 (3.1, 7.4) Uncertain (? A, B) P(A): 0.50, P(AB): 0.34, P(B): 0.13
T2a Olallamys [i] 7.4 (4.8, 10.3) Recent Uncertain (? B) P(A): 0.58, P(B): 0.33
[ii] 8.3 (5.6, 11.3) 7.4 (4.8, 10.3) Uncertain (? B, C) P(A): 0.60, P(AB): 0.23, P(AC): 0.10
[iii] 12.5 (8.8, 16.4) 8.3 (5.6, 11.3) Amazon (A →?) P(A): 0.86, P(AB): 0.10
T3a Dactylomys 8.3 (5.6, 11.3) 3.7 (2.1, 5.5) Uncertain (? A, B) P(A): 0.71, P(B): 0.12, P(AB): 0.11
T4 Mesomys [i] 1.6 (0.9, 2.3) 1.2 (0.6, 1.9) Uncertain (? A, B) P(A): 0.63, P(AB): 0.37
[ii] 2.8 (1.8, 4.0) 1.6 (0.9, 2.3) Amazon (A → AB) P(A): 0.95
Figure5a
T2b Olallamys 8.4 (7.1, 9.7) Recent Amazon (A → B) P(A): 0.85, P(B): 0.11
T3b Dactylomys [i] 8.4 (7.1, 9.7) 4.2 (3.2, 5.1) Uncertain (? A, B) P(AB): 0.56, P(B): 0.25, P(A): 0.16
[ii] 9.0 (7.7, 10.3) 8.4 (7.1, 9.7) Uncertain (? B, AB) P(A): 0.40, P(AB): 0.33, P(B): 0.23
[iii] 13.4 (11.8, 15.0) 9.0 (7.7, 10.3) Amazon (A → ?) P(A): 0.78
Figure5b
T2c Olallamys 13.4 (11.9, 15.0) 9.0 (7.7, 10.3) Amazon (A → B) P(A): 0.82 → P(B): 0.77, P(A): 0.14
T3c Dactylomys [i] 8.5 (7.3, 9.8) 4.2 (3.2, 5.1) Uncertain (? A, B) P(AB): 0.46, P(A): 0.34, P(B): 0.17
[ii] 9.0 (7.7, 10.3) 8.5 (7.3, 9.8) Uncertain (? → C, AB) P(A): 0.49, P(B): 0.36, P(C): 0.12

The earliest and latest possible times of transition are listed as the stem group and crown group divergences, respectively. Transitions that are uncertain and may have occurred on more than one branch in the given phylogeny are noted as [i] stem ancestor, [ii] two branches back, and [iii] three branches back. Likelihoods represent the probability that a stem ancestor inhabited a given region immediately after speciation. Confidently reconstructed ancestral ranges (in bold) have a likelihood greater than 0.75; otherwise, ancestral ranges and transition polarities were considered uncertain. Regions are coded as A = Amazon, B = Andes, AB = Amazon + Andes, and AC = Amazon + Atlantic Forest.

Upham et al.

Upham et al. BMC Evolutionary Biology 2013 13:191   doi:10.1186/1471-2148-13-191

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