Aburria
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 A piping-guan, Aburria sp.
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Aburria are the piping-guans, a bird genus in the Cracidae family. Most species were formerly classified in Pipile, but a recent study (Grau et al. 2005), evaluating mtDNA, osteology and biogeography data (Grau et al., 2005) concluding that the Wattled Guan belongs into the same genus as these and is a hypermelanistic piping-guan. Thus, Pipile became a junior synonym of Aburria.
The same results also showed that the light-faced taxa pipile, cumanensis and cujubi are not, as was sometimes suggested, conspecific.
It was possible to confidently resolve that the white-faced species form a clade, whereas the more basal black-faced forms are of less certain relationship. Possibly, the Black-fronted Piping-guan is the basalmost taxon, but the placement of the Wattled Piping-guan in regard to its congeners is not all too well resolved. Blue wattles evolved only once, in a lineage which seems to have originated north of the Amazon River. The piping-guans' radiation began in the latter half of the Early Pliocene, roughly 4-3.5 mya. The white-faced lineage emerged around 3 mya and its present diversity began to evolve around the Pliocene-Pleistocene boundary, when the ancestors of the Red-throated Piping-guan and the blue-wattled taxa split. Due to not being calibrated by material evidence such as fossils, the divergence times cannot be estimated with a high confidence (Grau et al. 2005).
The origin of the genus was possibly in the general area of eastern Bolivia, at the very margin of its current range. From the phylogeny outlined above, the piping-guans would be expected to have originated in the southern Brazilian lowlands. However, although the relationships of the genera of guans are not entirely clear, it seems most likely that the group originated in the northern Andes region: The northernmost guan genera Chamaepetes and Penelopina appear to be basal divergences, and Aburria is most likely closer to Penelope (which represents a generally southward radiation out of the northern Andes) than to these.
Thus it appears most likely that the present genus diverged in the eastern foothills of the Andes somewhere in the vicinity of Bolivia, far to the northwest from where its origin would be presumed from the phylogeny and present-day distribution of Aburria alone (Pereira et al. 2002, Grau et al. 2005). Two considerations are worthy of note: First, the time at which the ancestor of the piping-guans diverged from Penelope has been roughly dated to the Burdigalian, some 20-15 mya, which leaves a considerable gap during which no surviving piping-guan lineage evolved (Pereira et al. 2002). Secondly, it is notable that in the Late Pliocene, rising sea levels transformed much of the South American lowlands into brackish lagoon habitat unsuitable for piping-guans. Thus, the present distribution is apparently a relict, and extinction of populations/displacement by the more resilient Penelope guans seems to have played as much or possibly more of a role in shaping the diversity of piping-guans of our time than emergence of new lineages (Grau et al. 2005).
[edit] Species
- Black-fronted Piping-guan, Aburria jacutinga
- Wattled Piping-guan, Aburria aburri
- Red-throated Piping-guan, Aburria cujubi
- Trinidad Piping-guan, Aburria pipile
- Blue-throated Piping-guan, Aburria cumanensis
- Gray's Piping-guan, Aburria cumanensis grayi
[edit] References
- Grau, Erwin T.; Pereira, Sérgio Luiz; Silveira, Luís Fábio; Höfling, Elizabeth & Wanjtal, Anita (2005): Molecular phylogenetics and biogeography of Neotropical piping guans (Aves: Galliformes): Pipile Bonaparte, 1856 is synonym of Aburria Reichenbach, 1853. Molecular Phylogenetics and Evolution 35: 637-645. DOI:doi:10.1016/j.ympev.2004.12.004 PDF fulltext
- Pereira, Sérgio Luiz; Baker, Allan J.& Wajntal, Anita (2002): Combined nuclear and mitochondrial DNA sequences resolve generic relationships within the Cracidae (Galliformes, Aves). Systematic Biology 51(6): 946-958. DOI:10.1080/10635150290102519 PDF fulltext
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