Life-history specialization was not an evolutionary dead-end in Pyrenean cave beetles. Cieslak, A., Fresneda, J., & Ribera, I. Proceedings of the Royal Society B: Biological Sciences, 2014. ![Life-history specialization was not an evolutionary dead-end in Pyrenean cave beetles [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex Research on subterranean organisms has focused on the colonization process and some of the associated phenotypic changes, but little is known on the long-term evolutionary dynamics of subterranean lineages and the origin of some highly specialized complex characters. One of the most extreme modifications is the reduction of the number of larval instars in some Leptodirini beetles from the ancestral 3 to 2 and ultimately a single instar. This reduction is usually assumed to have occurred independently multiple times within the same lineage and geographical area, but its evolution has never been studied in a phylogenetic framework. Using a comprehensive molecular phylogeny, we found a low number of independent origins of the reduction in the number of instars, with a single transition, dated to the Oligocene-Miocene, from 3 to 2 and then 1 instar in the Pyrenees, the best-studied area. In the Pyrenees, the 1-instar lineage had a diversification rate (0.22 diversification events per lineage per million years) significantly higher than that of 3- or 2-instar lineages (0.10), and similar to that seen in other Coleopteran radiations. Far from being evolutionary dead-ends, ancient lineages fully adapted to subterranean life seem able to persist and diversify over long evolutionary periods. © 2014 The Author(s) Published by the Royal Society. All rights reserved.
@article{cieslak_life-history_2014,
title = {Life-history specialization was not an evolutionary dead-end in {Pyrenean} cave beetles},
volume = {281},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84980450217&doi=10.1098%2frspb.2013.2978&partnerID=40&md5=f217a42a541f99e686969f00b9d4d4ad},
doi = {10.1098/rspb.2013.2978},
abstract = {Research on subterranean organisms has focused on the colonization process and some of the associated phenotypic changes, but little is known on the long-term evolutionary dynamics of subterranean lineages and the origin of some highly specialized complex characters. One of the most extreme modifications is the reduction of the number of larval instars in some Leptodirini beetles from the ancestral 3 to 2 and ultimately a single instar. This reduction is usually assumed to have occurred independently multiple times within the same lineage and geographical area, but its evolution has never been studied in a phylogenetic framework. Using a comprehensive molecular phylogeny, we found a low number of independent origins of the reduction in the number of instars, with a single transition, dated to the Oligocene-Miocene, from 3 to 2 and then 1 instar in the Pyrenees, the best-studied area. In the Pyrenees, the 1-instar lineage had a diversification rate (0.22 diversification events per lineage per million years) significantly higher than that of 3- or 2-instar lineages (0.10), and similar to that seen in other Coleopteran radiations. Far from being evolutionary dead-ends, ancient lineages fully adapted to subterranean life seem able to persist and diversify over long evolutionary periods. © 2014 The Author(s) Published by the Royal Society. All rights reserved.},
number = {1781},
journal = {Proceedings of the Royal Society B: Biological Sciences},
author = {Cieslak, A. and Fresneda, J. and Ribera, I.},
year = {2014},
keywords = {ADAPTATION, Adaptation, Biological, Animals, Article, Base Sequence, Bayes theorem, Beetles, Biological Evolution, Caves, Diversification, EVOLUTION, France, Larval development, Life Cycle Stages, Life cycle, Likelihood Functions, Models, Genetic, Molecular Sequence Data, Phylogeny, Pyrenees, Spain, Speciation, Subterranean environment, animal, beetle, biological model, cave, colonization, genetic analysis, geographical region, life cycle stage, life history, molecular genetics, nucleotide sequence, phylogenetics, physiology, sequence alignment, specialization, speciation (biology), species differentiation, statistical model}
}
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One of the most extreme modifications is the reduction of the number of larval instars in some Leptodirini beetles from the ancestral 3 to 2 and ultimately a single instar. This reduction is usually assumed to have occurred independently multiple times within the same lineage and geographical area, but its evolution has never been studied in a phylogenetic framework. Using a comprehensive molecular phylogeny, we found a low number of independent origins of the reduction in the number of instars, with a single transition, dated to the Oligocene-Miocene, from 3 to 2 and then 1 instar in the Pyrenees, the best-studied area. In the Pyrenees, the 1-instar lineage had a diversification rate (0.22 diversification events per lineage per million years) significantly higher than that of 3- or 2-instar lineages (0.10), and similar to that seen in other Coleopteran radiations. 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