Incomplete lineage sorting and ancient admixture, and speciation without morphological change in ghost-worm cryptic species
Morphologically similar species, that is cryptic species, may be similar or quasi-similar owing to the deceleration of morphological evolution and stasis. While the factors underlying the deceleration of morphological evolution or stasis in cryptic species remain unknown, decades of research in the...
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PeerJ Inc.
2021-02-01
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| Online Access: | https://peerj.com/articles/10896.pdf |
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| author | José Cerca Angel G. Rivera-Colón Mafalda S. Ferreira Mark Ravinet Michael D. Nowak Julian M. Catchen Torsten H. Struck |
| author_facet | José Cerca Angel G. Rivera-Colón Mafalda S. Ferreira Mark Ravinet Michael D. Nowak Julian M. Catchen Torsten H. Struck |
| author_sort | José Cerca |
| collection | DOAJ |
| description | Morphologically similar species, that is cryptic species, may be similar or quasi-similar owing to the deceleration of morphological evolution and stasis. While the factors underlying the deceleration of morphological evolution or stasis in cryptic species remain unknown, decades of research in the field of paleontology on punctuated equilibrium have originated clear hypotheses. Species are expected to remain morphologically identical in scenarios of shared genetic variation, such as hybridization and incomplete lineage sorting, or in scenarios where bottlenecks reduce genetic variation and constrain the evolution of morphology. Here, focusing on three morphologically similar Stygocapitella species, we employ a whole-genome amplification method (WGA) coupled with double-digestion restriction-site associated DNA sequencing (ddRAD) to reconstruct the evolutionary history of the species complex. We explore population structure, use population-level statistics to determine the degree of connectivity between populations and species, and determine the most likely demographic scenarios which generally reject for recent hybridization. We find that the combination of WGA and ddRAD allowed us to obtain genomic-level data from microscopic eukaryotes (∼1 millimetre) opening up opportunities for those working with population genomics and phylogenomics in such taxa. The three species share genetic variance, likely from incomplete lineage sorting and ancient admixture. We speculate that the degree of shared variation might underlie morphological similarity in the Atlantic species complex. |
| first_indexed | 2024-03-09T06:36:40Z |
| format | Article |
| id | doaj.art-dbc67a414e054786a0cca7a92f8332f1 |
| institution | Directory Open Access Journal |
| issn | 2167-8359 |
| language | English |
| last_indexed | 2024-03-09T06:36:40Z |
| publishDate | 2021-02-01 |
| publisher | PeerJ Inc. |
| record_format | Article |
| series | PeerJ |
| spelling | doaj.art-dbc67a414e054786a0cca7a92f8332f12023-12-03T10:57:34ZengPeerJ Inc.PeerJ2167-83592021-02-019e1089610.7717/peerj.10896Incomplete lineage sorting and ancient admixture, and speciation without morphological change in ghost-worm cryptic speciesJosé Cerca0Angel G. Rivera-Colón1Mafalda S. Ferreira2Mark Ravinet3Michael D. Nowak4Julian M. Catchen5Torsten H. Struck6Department of Environmental Science, Policy, and Management, University of California, University of California, Berkeley, Berkeley, CA, United States of AmericaDepartment of Evolution, Ecology, and Behavior, University of Illinois at Urbana-Champaign, Urbana Champaign, IL, United States of AmericaDivision of Biological Sciences, University of Montana, Missoula, MT, United States of AmericaSchool of Life Sciences, University of Nottingham, Nottingham, United KingdomNatural History Museum, University of Oslo, Oslo, NorwayDepartment of Evolution, Ecology, and Behavior, University of Illinois at Urbana-Champaign, Urbana Champaign, IL, United States of AmericaNatural History Museum, University of Oslo, Oslo, NorwayMorphologically similar species, that is cryptic species, may be similar or quasi-similar owing to the deceleration of morphological evolution and stasis. While the factors underlying the deceleration of morphological evolution or stasis in cryptic species remain unknown, decades of research in the field of paleontology on punctuated equilibrium have originated clear hypotheses. Species are expected to remain morphologically identical in scenarios of shared genetic variation, such as hybridization and incomplete lineage sorting, or in scenarios where bottlenecks reduce genetic variation and constrain the evolution of morphology. Here, focusing on three morphologically similar Stygocapitella species, we employ a whole-genome amplification method (WGA) coupled with double-digestion restriction-site associated DNA sequencing (ddRAD) to reconstruct the evolutionary history of the species complex. We explore population structure, use population-level statistics to determine the degree of connectivity between populations and species, and determine the most likely demographic scenarios which generally reject for recent hybridization. We find that the combination of WGA and ddRAD allowed us to obtain genomic-level data from microscopic eukaryotes (∼1 millimetre) opening up opportunities for those working with population genomics and phylogenomics in such taxa. The three species share genetic variance, likely from incomplete lineage sorting and ancient admixture. We speculate that the degree of shared variation might underlie morphological similarity in the Atlantic species complex.https://peerj.com/articles/10896.pdfMorphologyRapid evolutionSlow evolutionStasisGenomicsRADseq |
| spellingShingle | José Cerca Angel G. Rivera-Colón Mafalda S. Ferreira Mark Ravinet Michael D. Nowak Julian M. Catchen Torsten H. Struck Incomplete lineage sorting and ancient admixture, and speciation without morphological change in ghost-worm cryptic species PeerJ Morphology Rapid evolution Slow evolution Stasis Genomics RADseq |
| title | Incomplete lineage sorting and ancient admixture, and speciation without morphological change in ghost-worm cryptic species |
| title_full | Incomplete lineage sorting and ancient admixture, and speciation without morphological change in ghost-worm cryptic species |
| title_fullStr | Incomplete lineage sorting and ancient admixture, and speciation without morphological change in ghost-worm cryptic species |
| title_full_unstemmed | Incomplete lineage sorting and ancient admixture, and speciation without morphological change in ghost-worm cryptic species |
| title_short | Incomplete lineage sorting and ancient admixture, and speciation without morphological change in ghost-worm cryptic species |
| title_sort | incomplete lineage sorting and ancient admixture and speciation without morphological change in ghost worm cryptic species |
| topic | Morphology Rapid evolution Slow evolution Stasis Genomics RADseq |
| url | https://peerj.com/articles/10896.pdf |
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