dc.contributor.author
de Mestier, Astrid
dc.contributor.author
Lücking, Robert
dc.contributor.author
Gutierrez, Jorge
dc.contributor.author
Brokamp, Grischa
dc.contributor.author
Celis, Marcela
dc.contributor.author
Borsch, Thomas
dc.date.accessioned
2023-03-10T11:28:26Z
dc.date.available
2023-03-10T11:28:26Z
dc.identifier.uri
https://refubium.fu-berlin.de/handle/fub188/38278
dc.identifier.uri
http://dx.doi.org/10.17169/refubium-37997
dc.description.abstract
Using the genus Casearia, we assessed the status of nested singletons: individual specimens corresponding to accepted species but in molecular trees appearing nested within clades of closely related species. Normally, such cases would be left undecided, while on the other hand, timely taxonomic decisions are required. We argue that morphological, chorological, and ecological data can be informative to illuminate patterns of speciation. Their use can provide a first step in testing taxon concepts at species level. We focused on five cases of nested singletons in trees of the genus Casearia. We employed PCA and cluster analysis to assess phenotypic differentiation. Using geocoordinates, we calculated niche space differentiation based on 19 bioclim variables, by means of PCA and niche equivalency and similarity tests and generated dot maps. We found that the singletons were morphologically distinctive in two of the five cases (Casearia selloana and C. manausensis), relatively distinctive in two other cases (C. zizyphoides and C. mariquitensis), and partially overlapping in the last case (C. grandiflora). For two cases (C. mariquitensis and C. selloana), ecological niche space was broadly overlapping, in two cases it was found broadly nested (C. grandiflora and C. zizyphoides), and in one case narrowly nested (C. manausensis), but in no case niche differentiation was observed. Niche overlap, similarity and equivalency showed corresponding patterns. Given these data, one would interpret C. selloana and C. manausensis as presumably well-distinguished taxa, their narrow distribution ranges suggesting recently emerging lineages. The other three cases are not clearcut. Morphological data would suggest particularly C. grandiflora conspecific with C. arborea, but differences in the distribution are intriguing. Our approach would reject the notion of potential synonymy based on nested phylogenetic placement for at least two of the five cases. The other case also shows no complete lack of differentiation which would support synonymy.
en
dc.format.extent
20 Seiten
dc.rights.uri
https://creativecommons.org/licenses/by/4.0/
dc.subject
Ecological niche equivalency test
en
dc.subject
integrative taxonomy
en
dc.subject
molecular phylogeny
en
dc.subject
species delimitation
en
dc.subject.ddc
500 Naturwissenschaften und Mathematik::580 Pflanzen (Botanik)::580 Pflanzen (Botanik)
dc.title
Nested singletons in molecular trees: Utility of adding morphological and geographical data from digitized herbarium specimens to test taxon concepts at species level in the case of Casearia (Salicaceae)
dc.type
Wissenschaftlicher Artikel
dcterms.bibliographicCitation.articlenumber
e9736
dcterms.bibliographicCitation.doi
10.1002/ece3.9736
dcterms.bibliographicCitation.journaltitle
Ecology and Evolution
dcterms.bibliographicCitation.number
1
dcterms.bibliographicCitation.volume
13
dcterms.bibliographicCitation.url
https://doi.org/10.1002/ece3.9736
refubium.affiliation
Botanischer Garten und Botanisches Museum Berlin-Dahlem (BGBM)
refubium.resourceType.isindependentpub
no
dcterms.accessRights.openaire
open access
dcterms.isPartOf.eissn
2045-7758
refubium.resourceType.provider
WoS-Alert