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Dating the Diversification of the Major Lineages of Passeriformes (Aves)


Dating the Diversification of the Major Lineages of Passeriformes (Aves)

Per G P Ericson et al. BMC Evol Biol.


Background: The avian Order Passeriformes is an enormously species-rich group, which comprises almost 60% of all living bird species. This diverse order is believed to have originated before the break-up of Gondwana in the late Cretaceous. However, previous molecular dating studies have relied heavily on the geological split between New Zealand and Antarctica, assumed to have occurred 85-82 Mya, for calibrating the molecular clock and might thus be circular in their argument.

Results: This study provides a time-scale for the evolution of the major clades of passerines using seven nuclear markers, five taxonomically well-determined passerine fossils, and an updated interpretation of the New Zealand split from Antarctica 85-52 Mya in a Bayesian relaxed-clock approach. We also assess how different interpretations of the New Zealand-Antarctica vicariance event influence our age estimates. Our results suggest that the diversification of Passeriformes began in the late Cretaceous or early Cenozoic. Removing the root calibration for the New Zealand-Antarctica vicariance event (85-52 Mya) dramatically increases the 95% credibility intervals and leads to unrealistically old age estimates. We assess the individual characteristics of the seven nuclear genes analyzed in our study. Our analyses provide estimates of divergence times for the major groups of passerines, which can be used as secondary calibration points in future molecular studies.

Conclusions: Our analysis takes recent paleontological and geological findings into account and provides the best estimate of the passerine evolutionary time-scale currently available. This time-scale provides a temporal framework for further biogeographical, ecological, and co-evolutionary studies of the largest bird radiation, and adds to the growing support for a Cretaceous origin of Passeriformes.


Figure 1
Figure 1
Phylogenetic estimate of the evolutionary time-scale of passerines, with 95% credibility intervals plotted for estimated divergence times (thin blue bars). Thick red bars represent the realized age priors (95%) for the constrained nodes. Labels A-F indicate calibration points and fossil placements, A: vicariance event separating New Zealand from Antarctica, B: honeyeater (Meliphagidae) [44], C: logrunner (Orthonychidae) (JMTN, unpublished observations), D: crown-group cracticid (Cracticidae) [41], E: oriolid (Oriolidae) [42], F: "climbing Certhioidea" [43]. Panel below figure indicates the geological time line; Q: Quaternary, Pl.: Pliocene, P: Pleistocene.
Figure 2
Figure 2
Divergence-time estimates (95% credibility intervals) from individual genes (colored boxes) compared with the concatenated gene analysis (95% credibility intervals, gray background box, and posterior density, gray line) for selected groups. Genes are ordered top-down by the number of parsimony-informative characters.
Figure 3
Figure 3
Median divergence-time estimates from individual genes (x axes) versus the combined data (y axes, “All”) for corresponding nodes in the tree from the analysis of the combined data. The dotted line represents the one-to-one correlation. Genes are ordered from left to right and top-down by the number of parsimony-informative characters. The last, trivial, correlation (All vs. All) is included to illustrate the concentration of node estimates over time.
Figure 4
Figure 4
Widths of the 95% credibility intervals of divergence-time estimates for individual genes over time. Genes are ordered from left to right and top-down by the number of parsimony-informative characters.

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