ORCID Profile
0000-0001-7182-2763
Current Organisations
Uppsala University
,
Uppsala Universitet
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Publisher: Wiley
Date: 08-05-2020
DOI: 10.1111/ZSC.12422
Publisher: Wiley
Date: 20-04-2016
DOI: 10.1111/JBI.12758
Publisher: Proceedings of the National Academy of Sciences
Date: 04-2019
Abstract: Avian ersification has been influenced by global climate change, plate tectonic movements, and mass extinction events. However, the impact of these factors on the ersification of the hyper erse perching birds (passerines) is unclear because family level relationships are unresolved and the timing of splitting events among lineages is uncertain. We analyzed DNA data from 4,060 nuclear loci and 137 passerine families using concatenation and coalescent approaches to infer a comprehensive phylogenetic hypothesis that clarifies relationships among all passerine families. Then, we calibrated this phylogeny using 13 fossils to examine the effects of different events in Earth history on the timing and rate of passerine ersification. Our analyses reconcile passerine ersification with the fossil and geological records suggest that passerines originated on the Australian landmass ∼47 Ma and show that subsequent dispersal and ersification of passerines was affected by a number of climatological and geological events, such as Oligocene glaciation and inundation of the New Zealand landmass. Although passerine ersification rates fluctuated throughout the Cenozoic, we find no link between the rate of passerine ersification and Cenozoic global temperature, and our analyses show that the increases in passerine ersification rate we observe are disconnected from the colonization of new continents. Taken together, these results suggest more complex mechanisms than temperature change or ecological opportunity have controlled macroscale patterns of passerine speciation.
Publisher: American Association for the Advancement of Science (AAAS)
Date: 12-12-2014
Abstract: To better determine the history of modern birds, we performed a genome-scale phylogenetic analysis of 48 species representing all orders of Neoaves using phylogenomic methods created to handle genome-scale data. We recovered a highly resolved tree that confirms previously controversial sister or close relationships. We identified the first ergence in Neoaves, two groups we named Passerea and Columbea, representing independent lineages of erse and convergently evolved land and water bird species. Among Passerea, we infer the common ancestor of core landbirds to have been an apex predator and confirm independent gains of vocal learning. Among Columbea, we identify pigeons and flamingoes as belonging to sister clades. Even with whole genomes, some of the earliest branches in Neoaves proved challenging to resolve, which was best explained by massive protein-coding sequence convergence and high levels of incomplete lineage sorting that occurred during a rapid radiation after the Cretaceous-Paleogene mass extinction event about 66 million years ago.
Publisher: Wiley
Date: 25-09-2022
DOI: 10.1111/ZSC.12568
Abstract: Morphology has been a leading taxonomic guiding light to systematists for the last couple of hundred years. However, the genetic and – more recently – genomic revolution have produced numerous demonstrations of erroneous classifications that were based on labile morphological traits. We used thousands of genome‐wide markers to shed light on evolutionary dynamics in a confusing and taxonomically obscure group of Asian Cyornis flycatchers. Using genomic data, we corroborated recent findings based on three mitochrondrial and five nuclear genes that the two taxa hainanus and klossi which were previously treated as separate species ( Cyornis hainanus and Cyornis rubeculoides klossi , respectively) are genomically homogeneous and form a single species, C. hainanus . We also uncovered a novel case of interbreeding between C. hainanus and a non‐sister species, C. glaucicomans , illustrating these flycatchers' ability to hybridise in marginal situations even after substantial times of ergence. Our study illustrates how genome‐wide loci can shed light on complicated taxonomic problems, resulting in a better integration of phenotypic and genotypic data.
No related grants have been discovered for Per Alström.