Recent population differentiation in the habitat specialist Glossy Antshrike (Aves: Thamnophilidae) across Amazonian seasonally flooded forests

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Silva , S M , Ribas , C C & Aleixo , A 2021 , ' Recent population differentiation in the habitat specialist Glossy Antshrike (Aves: Thamnophilidae) across Amazonian seasonally flooded forests ' , Ecology and Evolution , vol. 11 , no. 17 , pp. 11826-11838 . https://doi.org/10.1002/ece3.7951

Title: Recent population differentiation in the habitat specialist Glossy Antshrike (Aves: Thamnophilidae) across Amazonian seasonally flooded forests
Author: Silva, Sofia Marques; Ribas, Camila C.; Aleixo, Alexandre
Other contributor: University of Helsinki, Zoology
Date: 2021-09
Language: eng
Number of pages: 13
Belongs to series: Ecology and Evolution
ISSN: 2045-7758
DOI: https://doi.org/10.1002/ece3.7951
URI: http://hdl.handle.net/10138/334656
Abstract: We assessed population structure and the spatio-temporal pattern of diversification in the Glossy Antshrike Sakesphorus luctuosus (Aves, Thamnophilidae) to understand the processes shaping the evolutionary history of Amazonian floodplains and address unresolved taxonomic controversies surrounding its species limits. By targeting ultraconserved elements (UCEs) from 32 specimens of S. luctuosus, we identified independent lineages and estimated their differentiation, divergence times, and migration rates. We also estimated current and past demographic histories for each recovered lineage. We found evidence confirming that S. luctuosus consists of a single species, comprising at least four populations, with some highly admixed individuals and overall similar levels of migration between populations. We confirmed the differentiation of the Araguaia River basin population (S. l. araguayae) and gathered circumstantial evidence indicating that the taxon S. hagmanni may represent a highly introgressed population between three distinct phylogroups of S. luctuosus. Divergences between populations occurred during the last 1.2 mya. Signs of population expansions were detected for populations attributed to subspecies S. l. luctuosus, but not for the S. l. araguayae population. Our results support that S. luctuosus has had a complex population history, resulting from a high dependence on southeastern "clear water" seasonally flooded habitats and their availability through time. Spatial and demographic expansions toward the western "white water" flooded forests might be related to recent changes in connectivity and availability of these habitats. Our study reinforces the view that isolation due to absence of suitable habitat has been an important driver of population differentiation within Amazonian flooded forests, but also that differences between varzeas ("white water" floodplains, mostly in southwestern Amazonia) and igapos ("clear water" floodplains, especially located in the east) should be further explored as drivers of micro-evolution for terrestrial species.
Subject: Igapo
Phylogeography
population genomics
Sakesphorus luctuosus
taxonomy
ultraconserved elements
Varzea
HISTORICAL DIVERSIFICATION
ULTRACONSERVED ELEMENTS
EVOLUTION
INFERENCE
RIVER
SELECTION
CAPTURE
MARKERS
COLOR
1181 Ecology, evolutionary biology
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