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Slow and steady wins the race: Diversification rate is independent from body size and lifestyle in Malagasy skinks (Squamata: Scincidae: Scincinae)

Belluardo, F. (författare)
Munoz-Pajares, A. J. (författare)
Miralles, A. (författare)
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Silvestro, Daniele (författare)
Gothenburg University,Göteborgs universitet,Institutionen för biologi och miljövetenskap,Department of Biological and Environmental Sciences
Cocca, W. (författare)
Ratsoavina, F. M. (författare)
Villa, A. (författare)
Roberts, S. H. (författare)
Mezzasalma, M. (författare)
Zizka, A. (författare)
Antonelli, Alexandre, 1978 (författare)
Gothenburg University,Göteborgs universitet,Institutionen för biologi och miljövetenskap,Department of Biological and Environmental Sciences
Crottini, A. (författare)
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 (creator_code:org_t)
Elsevier BV, 2023
2023
Engelska.
Ingår i: Molecular Phylogenetics and Evolution. - : Elsevier BV. - 1055-7903. ; 178
  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
Stäng  
  • Most of the unique and diverse vertebrate fauna that inhabits Madagascar derives from in situ diversification from colonisers that reached this continental island through overseas dispersal. The endemic Malagasy Scincinae lizards are amongst the most species-rich squamate groups on the island. They colonised all bioclimatic zones and display many ecomorphological adaptations to a fossorial (burrowing) lifestyle. Here we propose a new phylogenetic hypothesis for their diversification based on the largest taxon sampling so far compiled for this group. We estimated divergence times and investigated several aspects of their diversification (diversification rate, body size and fossorial lifestyle evolution, and biogeography). We found that diversification rate was constant throughout most of the evolutionary history of the group, but decreased over the last 6-4 million years and independently from body size and fossorial lifestyle evolution. Fossoriality has evolved from fully quadrupedal ancestors at least five times independently, which demonstrates that even complex morphological syndromes - in this case involving traits such as limb regression, body elongation, modification of cephalic scalation, depigmentation, and eyes and ear-opening regression - can evolve repeatedly and independently given enough time and eco-evolutionary advantages. Initial diversification of the group likely occurred in forests, and the divergence of sand-swimmer genera around 20 Ma appears linked to a period of aridification. Our results show that the large phenotypic variability of Malagasy Scincinae has not influenced diversification rate and that their rich species diversity results from a constant accumulation of lineages through time. By compiling large geographic and trait-related datasets together with the computation of a new time tree for the group, our study contributes important insights on the diversification of Malagasy vertebrates.

Ämnesord

NATURVETENSKAP  -- Biologi -- Biokemi och molekylärbiologi (hsv//swe)
NATURAL SCIENCES  -- Biological Sciences -- Biochemistry and Molecular Biology (hsv//eng)

Nyckelord

Biogeography
Evolutionary radiations
Fossoriality
In situ
diversification
Islands
Madagascar
r package
protracted speciation
molecular phylogenies
adaptive
radiation
bayesian-analysis
species richness
reptiles lizards
madagascar
evolution
extinction
Biochemistry & Molecular Biology
Evolutionary Biology
Heredity

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