scholarly journals Species Delimitation and Lineage Separation History of a Species Complex of Aspens in China

2017 ◽  
Vol 8 ◽  
Author(s):  
Honglei Zheng ◽  
Liqiang Fan ◽  
Richard I. Milne ◽  
Lei Zhang ◽  
Yaling Wang ◽  
...  
Keyword(s):  
Species Delimitation ◽  
Species Complex ◽  
History Of

scholarly journals Meiofaunal cryptic species challenge species delimitation: the case of the Monocelis lineata (Platyhelminthes: Proseriata) species complex

2016 ◽  
Vol 85 (2) ◽  
pp. 123-145 ◽  
Author(s):  
Fabio Scarpa ◽  
Piero Cossu ◽  
Tiziana Lai ◽  
Daria Sanna ◽  
Marco Curini-Galletti ◽  
...  
Keyword(s):  
Species Delimitation ◽  
Species Complex ◽  
Taxonomic Resolution ◽  
Biodiversity Crisis ◽  
Candidate Species ◽  
History Of ◽  
Adaptive Radiations ◽  
Taxonomic Approach ◽  
Conservation Concern ◽  
Lines Of Evidence

Given the pending biodiversity crisis, species delimitation is a critically important task in conservation biology, but its efficacy based on single lines of evidence has been questioned as it may not accurately reflect species limits and relationships. Hence, the use of multiple lines of evidence has been portrayed as a means to overcome identification issues arising from gene/species tree discordance, morphological convergence or recent adaptive radiations. Here, the integrative taxonomic approach has been used to address the study of the Monocelis lineataspecies complex. The taxonomic resolution of the complex is challenging, as the species lacks sclerotised copulatory structures, which as a rule of thumb aid identification in Proseriata. Eighteen populations, which encompass most of the geographic range of the complex, were studied using morphology, karyology, crossbreeding experiments and molecular analysis. These different markers provided evidence of four (karyology) to eight (morphology) discrete entities, whereas crossings showed various degrees of intersterility among the tested populations. Molecular species delimitation revealed a different number of candidate species, spanning from five (ABGD and K/θ) to 11 (GMYC). Such incongruences reflect the multifaceted evolutionary history of M. lineata s.l.and hamper the full taxonomic resolution of the complex. However, two candidate species were consistently validated by all of the markers and are described as new species: Monocelis algicolanov. sp. and M. exquisitanov. sp. The latter species appear to have a restricted distribution, and the possibility that meiofaunal taxa may be of conservation concern is discussed.

scholarly journals Species delimitation and hybridisation history of a hazel species complex

2021 ◽  
Author(s):  
Zhiqiang Lu ◽  
Yongshuai Sun ◽  
Ying Li ◽  
Yongzhi Yang ◽  
Gaini Wang ◽  
...  
Keyword(s):  
Species Delimitation ◽  
Species Complex ◽  
Population Level ◽  
Flowering Phenology ◽  
The Other ◽  
Genetic Composition ◽  
Ssr Loci ◽  
History Of ◽  
Taxonomic Groups ◽  
Taxonomic Studies

Abstract Background and Aims Hybridisation increases species adaptation and biodiversity but also obscures species boundaries. In this study, species delimitation and hybridisation history were examined within one Chinese hazel species complex (Corylus chinensis–Corylus fargesii). Two species including four varieties have already been described for this complex, with overlapping distributions. Methods A total of 322 trees from 44 populations of these four varieties across their ranges were sampled for morphological and molecular analyses. Climatic datasets based on 108 geographical locations were used to evaluate their niche differentiations. Flowering phenology was also observed for two co-occurring species or varieties. Key Results Four statistically different phenotypic clusters were revealed, but these clusters were highly inconsistent with the traditional taxonomic groups. All the clusters showed statistically distinct niches, with complete or partial geographic isolation. Only two clusters displayed a distributional overlap, but they had distinct flowering phenologies at the site where they co-occurred. Population-level evidence based on the genotypes of 10 simple sequence repeat (SSR) loci supported four phenotypic clusters. In addition, one cluster was shown to have an admixed genetic composition derived from the other three clusters through repeated historical hybridisations. Conclusions Based on our new evidence, it is better to treat the four clusters identified here as four independent species. One of them was shown to have an admixed genetic composition derived from the other threes through repeated historical hybridisations. This study highlights the importance of applying integrative and statistical methods to infer species delimitations and hybridisation history. Such a protocol should be adopted widely for future taxonomic studies.

scholarly journals Species delimitation and invasion history of the balsam woolly adelgid, Adelges ( Dreyfusia ) piceae (Hemiptera: Aphidoidea: Adelgidae), species complex

2020 ◽  
Author(s):  
Nathan P. Havill ◽  
Brian P. Griffin ◽  
Jeremy C. Andersen ◽  
Robert G. Foottit ◽  
Mathias J. Justesen ◽  
...  
Keyword(s):  
Species Delimitation ◽  
Species Complex ◽  
Invasion History ◽  
Balsam Woolly Adelgid ◽  
History Of

Pseudallescheria boydii Species Complex Fungal Rhinitis and Sinusitis in a Dog

2011 ◽  
Vol 47 (5) ◽  
pp. 365-369 ◽  
Author(s):  
Kristine Bruskiewicz ◽  
Martin Crawford-Jakubiak
Keyword(s):  
Species Complex ◽  
Human Pathogen ◽  
Pseudallescheria Boydii ◽  
Mixed Breed ◽  
History Of

A 9 yr old male castrated Australian shepherd mixed-breed dog with a 3 mo history of intermittent unilateral epistaxis was diagnosed with Pseudallescheria boydii species complex fungal rhinitis and sinusitis. This fungal organism is a rare cause of disease in dogs and an emerging human pathogen. The dog was successfully treated with topical clotrimazole.

scholarly journals Species delimitation in the Stenocereus griseus (Cactaceae) species complex reveals a new species, S. huastecorum

PLoS ONE ◽  
2018 ◽  
Vol 13 (1) ◽  
pp. e0190385 ◽  
Author(s):  
Hernán Alvarado-Sizzo ◽  
Alejandro Casas ◽  
Fabiola Parra ◽  
Hilda Julieta Arreola-Nava ◽  
Teresa Terrazas ◽  
...  
Keyword(s):  
New Species ◽  
Species Delimitation ◽  
Species Complex ◽  
A New Species

Atlas of leaf surface micromorphology in Aloe L. (Asphodelaceae) from the Horn of Africa region

Phytotaxa ◽  
2021 ◽  
Vol 524 (4) ◽  
pp. 261-282
Author(s):  
ESHETU FENTAW ◽  
KELDA F.V.A. ELLIOTT ◽  
SEBSEBE DEMISSEW ◽  
DAVID CUTLER ◽  
OLWEN M. GRACE
Keyword(s):  
Species Delimitation ◽  
Plant Material ◽  
Species Complex ◽  
Leaf Surface ◽  
Detailed Comparison ◽  
Species Variation ◽  
Leaf Epidermis ◽  
Horn Of Africa ◽  
Surface Micromorphology ◽  
Leaf Surface Micromorphology

The confident identification to species rank of fragmentary and sterile plant material is often challenged by the absence of diagnostic characters, which are present in intact specimens, reproductive parts, and plants in habitat. Here, we consider leaf surface micromorphology for the identification of the genus Aloe in the Horn of Africa region. Primary and secondary sculpturing of the leaf epidermis and stomata were characterised from SEM micrographs of 35 taxa representing 31 species of Aloe (Asphodelaceae subfam. Alooideae). Detailed comparison revealed that leaf surface characters are conserved between species and within-species variation is modest. Closely related taxa in the Aloe adigratana—A. camperi—A. sinana species complex could be distinguished using leaf surface micromorphology alone. These characters also guide species delimitation; in the species complex including A. schoelleri and A. steudneri, a narrow circumscription is supported, whereas with A. ankoberensis and A. pulcherrima, a wider circumscription merits consideration. The observed trait combinations are characteristic of plants in xeric environments, with the most notable feature being stomata that are most deeply sunken in species in more arid habitats. Our findings support the use of comparative study of micromorphological leaf surface characters for species identification and taxonomy in the genus Aloe.

scholarly journals Correction to: Enlightening the black and white: species delimitation and UNITE species hypothesis testing in the Russula albonigra species complex

IMA Fungus ◽  
2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Ruben De Lange ◽  
Slavomír Adamčík ◽  
Katarína Adamčíkova ◽  
Pieter Asselman ◽  
Jan Borovička ◽  
...  
Keyword(s):  
Hypothesis Testing ◽  
Species Delimitation ◽  
Species Complex ◽  
Black And White

scholarly journals Uncovering hidden specific diversity of Andean glassfrogs of theCentrolene buckleyispecies complex (Anura: Centrolenidae)

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e5856 ◽  
Author(s):  
Luis Amador ◽  
Andrés Parada ◽  
Guillermo D’Elía ◽  
Juan M. Guayasamin
Keyword(s):  
Species Delimitation ◽  
Species Complex ◽  
Behavioral Data ◽  
Nuclear Markers ◽  
Evolutionary Significant Units ◽  
Candidate Species

The glassfrogCentrolene buckleyihas been recognized as a species complex. Herein, using coalescence-based species delimitation methods, we evaluate the specific diversity within this taxon. Four coalescence approaches (generalized mixed Yule coalescents, Bayesian general mixed Yule-coalescent, Poisson tree processes, and Bayesian Poisson tree processes) were consistent with the delimitation results, identifying four lineages within what is currently recognized asC. buckleyi. We propose three new candidate species that should be tested with nuclear markers, morphological, and behavioral data. In the meantime, for conservation purposes, candidate species should be considered evolutionary significant units, in light of observed population crashes in theC. buckleyispecies complex. Finally, our results support the validity ofC. venezuelense, formerly considered as a subspecies ofC. buckleyi.

Species Delimitation and evolutionary history of tree frogs in the Hyla chinensis-group (Hylidae, Amphibian)

2019 ◽  
Author(s):  
Tao Pan ◽  
Guiyou Wu ◽  
Xing Kang ◽  
Peng Yan ◽  
Izaz Ali ◽  
...  
Keyword(s):  
Species Delimitation ◽  
Divergence Time ◽  
Distinct Species ◽  
Species Group ◽  
Early Miocene ◽  
Evolutionary Divergence ◽  
Dabie Mountains ◽  
Ancestral Area ◽  
Ancestral Area Reconstruction ◽  
History Of

Abstract Background Species are the cornerstone in many domains of biology research, which made the accurate species delimitation became critically important. In this study, the systematics and biogeography of the Hyla chinensis -group were analyzed based on phylogeny, species delimitation and ancestral area reconstruction methods.Results The phylogenetic results showed six specific clusters existed in the H. chinensis- group. BPP analysis indicated that six distinct species exist due to the high probability values (>0.95), which were also supported by the BF analysis. The divergence time of the H. chinensis -group is estimated to date back to 18.84 Mya in the early Miocene. Combining the results of ancestral area reconstruction, the H. chinensis -group might have originated from Guangxi-Hainan, then spread eastwardly and reached Nanling mountains, Wuyi mountains, Huangshan mountains and Taiwan. In rightabout colonization, it is gradually extended to the Yunnan-Guizhou Plateau, Sichuan basin, Qinling mountains and Dabie mountains. Considering the geological movement from early Miocene to Pliocene, the colonization pattern of the H. chinensis -group maybe closely related to the progressive uplift of Qinghai-Tibetan Plateau (QTP) and historical climate change.Conclusions Our study provides evidence for species delimitation and speciation process within the H. chinensis -group. Our study supports the hypothesis that the evolutionary divergence in this species group was a consequence of the progressive uplift of QTP and environmental change.

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