Phylogeography of the widespread Caribbean spiny orb weaver Gasteracantha cancriformis

Background: Modern molecular analyses are often inconsistent with pre-cladistic taxonomic hypotheses, frequently indicating higher richness than morphological taxonomy estimates. Among Caribbean spiders, widespread species are relatively few compared to the prevalence of single island endemics. The...

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Autores Principales: Chamberland, Lisa, Salgado-Roa, Fabian C., Basco, Alma, Crastz-Flores, Amanda, Binford, Greta J., Agnarsson, Ingi
Formato: Artículo (Article)
Lenguaje:Inglés (English)
Publicado: PeerJ 2020
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Acceso en línea:https://repository.urosario.edu.co/handle/10336/24940
id ir-10336-24940
recordtype dspace
spelling ir-10336-249402022-05-02T12:37:21Z Phylogeography of the widespread Caribbean spiny orb weaver Gasteracantha cancriformis Chamberland, Lisa Salgado-Roa, Fabian C. Basco, Alma Crastz-Flores, Amanda Binford, Greta J. Agnarsson, Ingi Haplotype network Gene flow Phylogeny Color polymorphism Morphology Intraspecific relationships Species delimitation Genetic diversity Background: Modern molecular analyses are often inconsistent with pre-cladistic taxonomic hypotheses, frequently indicating higher richness than morphological taxonomy estimates. Among Caribbean spiders, widespread species are relatively few compared to the prevalence of single island endemics. The taxonomic hypothesis Gasteracantha cancriformis circumscribes a species with profuse variation in size, color and body form. Distributed throughout the Neotropics, G. cancriformis is the only morphological species of Gasteracantha in the New World in this globally distributed genus.Methods: We inferred phylogenetic relationships across Neotropical populations of Gasteracantha using three target genes. Within the Caribbean, we estimated genetic diversity, population structure, and gene flow among island populations.Results: Our findings revealed a single widespread species of Gasteracantha throughout the Caribbean, G. cancriformis, while suggesting two recently divergent mainland populations that may represent separate species, diverging IMages, or geographically isolated demes. The concatenated and COI (Cytochrome c oxidase subunit 1) phylogeny supported a Caribbean Glade nested within the New World. Genetic variability was high between island populations for our COI dataset; however, gene flow was also high, especially between large, adjacent islands. We found structured genetic and morphological variation within G. cancriformis island populations; however, this variation does not reflect genealogical relationships. Rather, isolation by distance and local morphological adaptation may explain the observed variation. 2020 2020-06-11T13:21:52Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2167-8359 https://repository.urosario.edu.co/handle/10336/24940 eng info:eu-repo/semantics/openAccess application/pdf PeerJ instname:Universidad del Rosario
institution EdocUR - Universidad del Rosario
collection DSpace
language Inglés (English)
topic Haplotype network
Gene flow
Phylogeny
Color polymorphism
Morphology
Intraspecific relationships
Species delimitation
Genetic diversity
spellingShingle Haplotype network
Gene flow
Phylogeny
Color polymorphism
Morphology
Intraspecific relationships
Species delimitation
Genetic diversity
Chamberland, Lisa
Salgado-Roa, Fabian C.
Basco, Alma
Crastz-Flores, Amanda
Binford, Greta J.
Agnarsson, Ingi
Phylogeography of the widespread Caribbean spiny orb weaver Gasteracantha cancriformis
description Background: Modern molecular analyses are often inconsistent with pre-cladistic taxonomic hypotheses, frequently indicating higher richness than morphological taxonomy estimates. Among Caribbean spiders, widespread species are relatively few compared to the prevalence of single island endemics. The taxonomic hypothesis Gasteracantha cancriformis circumscribes a species with profuse variation in size, color and body form. Distributed throughout the Neotropics, G. cancriformis is the only morphological species of Gasteracantha in the New World in this globally distributed genus.Methods: We inferred phylogenetic relationships across Neotropical populations of Gasteracantha using three target genes. Within the Caribbean, we estimated genetic diversity, population structure, and gene flow among island populations.Results: Our findings revealed a single widespread species of Gasteracantha throughout the Caribbean, G. cancriformis, while suggesting two recently divergent mainland populations that may represent separate species, diverging IMages, or geographically isolated demes. The concatenated and COI (Cytochrome c oxidase subunit 1) phylogeny supported a Caribbean Glade nested within the New World. Genetic variability was high between island populations for our COI dataset; however, gene flow was also high, especially between large, adjacent islands. We found structured genetic and morphological variation within G. cancriformis island populations; however, this variation does not reflect genealogical relationships. Rather, isolation by distance and local morphological adaptation may explain the observed variation.
format Artículo (Article)
author Chamberland, Lisa
Salgado-Roa, Fabian C.
Basco, Alma
Crastz-Flores, Amanda
Binford, Greta J.
Agnarsson, Ingi
author_facet Chamberland, Lisa
Salgado-Roa, Fabian C.
Basco, Alma
Crastz-Flores, Amanda
Binford, Greta J.
Agnarsson, Ingi
author_sort Chamberland, Lisa
title Phylogeography of the widespread Caribbean spiny orb weaver Gasteracantha cancriformis
title_short Phylogeography of the widespread Caribbean spiny orb weaver Gasteracantha cancriformis
title_full Phylogeography of the widespread Caribbean spiny orb weaver Gasteracantha cancriformis
title_fullStr Phylogeography of the widespread Caribbean spiny orb weaver Gasteracantha cancriformis
title_full_unstemmed Phylogeography of the widespread Caribbean spiny orb weaver Gasteracantha cancriformis
title_sort phylogeography of the widespread caribbean spiny orb weaver gasteracantha cancriformis
publisher PeerJ
publishDate 2020
url https://repository.urosario.edu.co/handle/10336/24940
_version_ 1740172798119116800
score 12,131701