Evolution between forest macrorefugia is linked to discordance between genetic and morphological variation in Neotropical passerines

https://doi.org/10.1016/j.ympev.2020.106849Get rights and content

Highlights

  • The Andean and the Atlantic forests acted as a refugia system (macrorefugia)

  • Evolution between refugia promoted stronger genetic than morphological divergence.

  • The Andean-Atlantic forests have been linked through the Cerrado and the Cerrado-Chaco transition.

  • We suggest recognizing isolated lineages of Poecilotriccus plumbeiceps as full species.

Abstract

The central Andean rainforests and the Atlantic Forest are two similar biomes that are fully isolated by xerophytic and open-vegetation regions (the Chaco and Cerrado, respectively). Even though there is evidence suggesting that these rainforests have been connected in the past, their dynamics of connection, the geographic areas that bridged these regions, and the biological processes that have promoted diversification between them remain to be studied. In this research, we used three passerine species (Poecilotriccus plumbeiceps, Phylloscartes ventralis and Cacicus chrysopterus) as models to address whether the Andean and the Atlantic forests have acted as a refugia system (macrorefugia), and to evaluate biogeographic hypotheses of diversification and connection between them. In order to achieve these goals, we performed traditional phylogeographic analyses and compared alternative biogeographic scenarios by using Approximate Bayesian Computation. Additionally, we performed morphological analyses to evaluate phenotypic divergence between these regions. Our findings support that both rainforest regions acted as refugia, but that the impact of their isolation was stronger on the genetic than on the morphologic characters. Our results provided evidence that both geographic isolation as well as ecological factors have modeled the external traits of forest organisms in the region. Regarding the connection routes between the Andes and the Atlantic Forest, the genetic data rejected the hypothesis of a Chaco connection in the tested species, providing evidence for a connection through the Cerrado or through the transition between the Cerrado and Chaco, in a process that could have started as early as the Late Miocene.

Keywords

Andean forests
Atlantic Forest
Birds
Approximate Bayesian Computation
Macrorefugia
Normal mixture models
Phenotypic divergence

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