INVESTIGADORES
JORDAN Emilio Ariel
congresos y reuniones científicas
Título:
Molecular phylogenetics of Doraditos (Aves: Pseudocolopteryx): plumage evolution, cryptic species and moving targets of sexual selection
Autor/es:
JORDAN, EMILIO ARIEL; ARETA, JUAN IGNACIO; TELLO, JOSÉ G.
Lugar:
San José
Reunión:
Congreso; XI NEOTROPICAL ORNITHOLOGICAL CONGRESS; 2019
Institución organizadora:
Neotropical Ornithological Society
Resumen:
Avian plumage evolves under different, often antagonistic, selective pressures due toa complex interplay between sexual demands and environmental challenges.Elucidating how evolutionary forces have molded plumage and other sexualsignals is key to understand phenotypic evolution in birds. Here we built thefirst species-level phylogenetic analysis of Pseudocolopteryx usingmitochondrial (ND2, COI) and nuclear (MYO, ODC) genes to explore theevolutionary processes that fostered intra- and interspecific phenotypicdifferences. Analyses recovered the monophyly of Pseudocolopteryx (P. sclateri(P. acutipennis (P. dinelliana (P. citreola-P. flaviventris)))), which wassister to Serpophaga nigricans. Ancestral state reconstruction supported ahighly dichromatic ancestor of Pseudocolopteryx followed by a general reductionof plumage dichromatism, while bill coloration was dichromatic in all fivespecies. Dichromatism was inversely related to acoustic complexity, possiblydue to an evolutionary tradeoff between two competing signal modalities (i.e.visual and auditory), where sexual selection pressures that promoted chromaticconspicuousness in males changed their main target from plumage to acousticcharacters during the evolution of Pseudocolopteryx. Modified primary featherswere ancestral in males, and were present in species that perform aerialdisplays with putative mechanical sounds (P. sclateri, P. acutipennis, P.dinelliana), but absent in those that do not (P. citreola, P. flaviventris).The two cryptic species (P. citreola and P. flaviventris) are sibling speciesthat diverged ca. 60kYA, showing that minimal genetic changes can lead todramatic vocal differences without obvious morphological changes, and addevidence showing that vocal signals may frequently be more important thanvisual ones in species recognition systems in the Tyrannidae.