Species limits of Solanum berthaultii Hawkes and S. tarijense Hawkes and the implications for species boundaries in Solanum sect. Petota

Taxon ◽  
2007 ◽  
Vol 56 (4) ◽  
pp. 987-999 ◽  
Author(s):  
David M. Spooner ◽  
Diego Fajardo ◽  
Glenn J. Bryan
Keyword(s):  
Species Boundaries ◽  
Solanum Berthaultii ◽  
Species Limits ◽  
Solanum Sect

A Morphometric Study of Species Boundaries of the Wild Potato Solanum Series Piurana (Solanaceae) and Putatively Related Species from Seven Other Series in Solanum Sect. Petota

2008 ◽  
Vol 33 (3) ◽  
pp. 566-578 ◽  
Author(s):  
Mercedes Ames ◽  
Alberto Salas ◽  
David M. Spooner
Keyword(s):  
United States ◽  
Related Species ◽  
Species Boundaries ◽  
Morphometric Study ◽  
Wild Potato ◽  
Morphological Similarity ◽  
Field Station ◽  
Constituent Species ◽  
Solanum Sect ◽  
Germplasm Accessions

There are about 190 wild potato (Solanum L. section Petota Dumort.) species distributed from the southwestern United States to central Argentina and adjacent Chile and Uruguay. The morphological similarity of many of its constituent species has led to widely conflicting taxonomic treatments. Solanum series Piurana Hawkes is one of 21 series recognized in section Petota in the latest comprehensive taxonomic treatment by Hawkes in 1990. They are distributed from southern Colombia, south through Ecuador to central Peru. The limits of the series and validity of its constituent species are unresolved. We provide the first comprehensive morphological phenetic study of the series, to include putatively related species in ser. Conicibaccata, Cuneoalata, Ingifolia, Megistacroloba, Simplicissima, Tuberosa, and Yungasensa, through an examination 188 living germplasm accessions of 33 species, planted in replicated plots in a field station in Andean Peru. Only four morphologically well-defined groups were supported. Continuing work is exploring molecular support for these species in these eight series.

Taxonomy of Sarga, Sorghum and Vacoparis (Poaceae: Andropogoneae)

2003 ◽  
Vol 16 (3) ◽  
pp. 279 ◽  
Author(s):  
Russell E. Spangler
Keyword(s):  
Type Species ◽  
New Genus ◽  
Species Boundaries ◽  
Morphological Evidence ◽  
Species Limits ◽  
The Past ◽  
Distinct Genus ◽  
Variable Species ◽  
Rank Constraints ◽  
Name Changes

Sorghum taxa are evaluated in light of recent molecular and morphological evidence. The data suggest that three distinct lineages exist, but relationships among these lineages are unresolved. Each lineage is recognised here as a distinct genus in the context of overall variation in tribe Andropogoneae. The type species for the name Sorghum is S. bicolor, the cultivar. S. halepense and S. nitidum are also retained in Sorghum. The name Sarga is resurrected to encompass the set of species formerly making up the bulk of subgenera Parasorghum and Stiposorghum. A new genus, Vacoparis, is defined to include the cytologically and morphologically distinct Australasian taxa, V. macrospermum and V. laxiflorum. The taxonomy proposed is contrasted with a rankless alternative to illustrate the smaller number of name changes that can be accomplished when rank constraints are not enforced. Uncertain relationships among the three lineages as well as among a large number of taxa comprising subtribe Saccharinae exemplifies the difficulties in assigning ranks to taxa that may have future dramatic name changes with new data. As discussions progress concerning the validity and utility of rankless classifications, concrete examples, such as the revision presented here, can provide insights into specific cases where strengths and weaknesses can be evaluated. Species boundaries in Sarga are different from those formerly defined. Continuous variation across specimens in characters used to distinguish taxa in the past led to the decision to broaden species limits so that fewer and morphologically variable species are recognised.

scholarly journals An integrative multi-approach workflow resolves species limits in the southernmost members of the Liolaemus kingii group (Squamata: Liolaemini)

2020 ◽  
Author(s):  
Kevin I. Sánchez ◽  
Luciano J. Avila ◽  
Jack W. Sites ◽  
Mariana Morando
Keyword(s):  
Species Delimitation ◽  
Model System ◽  
Divergence Times ◽  
Species Boundaries ◽  
Single Source ◽  
Species Limits ◽  
Candidate Species ◽  
Comprehensive Manner ◽  
Source Of Information ◽  
Lines Of Evidence

AbstractRecent conceptual and methodological advances have enabled an increasing number of studies to address the problem of species delimitation in a comprehensive manner. This is of particular interest in cases of species whose divergence times are recent, where the conclusions obtained from a single source of evidence can lead to the incorrect delimitation of entities or assignment of individuals to species. The southernmost species of the Liolaemus kingii group (namely L. baguali, L. escarchadosi, L. sarmientoi, L. tari and the candidate species L. sp. A) show widely overlapping distributions as well as recent mitochondrial divergences, thus phylogenetic relationships and species boundaries are ambiguous. Here we use a comprehensive approach to assess species limits and corroborate their status as independent lineages through the use of four sources of molecular and morphological information (mitochondrial cytochrome-b, nuclear sequences collected by ddRADseq, and linear, meristic and landmark-based morphometrics). We found concordance among the different datasets, but signs of admixture were detected between some of the species. Our results indicate that the L. kingii group can serve as a model system in studies of diversification accompanied by hybridization in nature. We emphasize the importance of using multiple lines of evidence in order to solve evolutionary stories, and minimizing potential erroneous results that may arise when relying on a single source of information.

Joseph Sidebotham: vicissitudes of a Victorian collector

2015 ◽  
Vol 42 (2) ◽  
pp. 197-210 ◽  
Author(s):  
Laurence M. Cook
Keyword(s):  
Natural History ◽  
Species Limits ◽  
Clear Cut ◽  
Natural History Collections ◽  
As Species ◽  
Scientific World

Joseph Sidebotham (1824–1885) was a Manchester cotton baron whose natural history collections are now in the Manchester Museum. In addition to collecting he suggested a method for identifying and classifying Lepidoptera and investigated variation within species as well as species limits. With three close collaborators, he is credited with discovering many species new to Britain in both Lepidoptera and Coleoptera. A suspicion of fraud attaches to these claims. The evidence is not clear-cut in the Lepidoptera, but a possible reason is suggested why Sidebotham, as an amateur in the increasingly professional scientific world, might have engaged in deceit.

Differences between recent and historical records of upper species limits in the northern European Alps

Erdkunde ◽  
2013 ◽  
Vol 67 (4) ◽  
pp. 345-354
Author(s):  
Sebastian Schmidtlein ◽  
Ulrike Faude ◽  
Ole Rössler ◽  
Hannes Feilhauer ◽  
Jörg Ewald ◽  
...  
Keyword(s):  
European Alps ◽  
Historical Records ◽  
Species Limits ◽  
Northern European
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