Highly divergent sympatric lineages of Leptotila verreauxi (Aves: Columbidae) suggest a secondary contact area in the Isthmus of Tehuantepec, Mexico

Avian Research, Journal Year: 2024, Volume and Issue: 15, P. 100160 - 100160

Published: Jan. 1, 2024

Due to a complex geological and biotic history, the Isthmus of Tehuantepec (IT), has been long recognized as driver for evolutionary divergence numerous lowland highland taxa. Widely distributed in lowlands American continent, White-Tipped Dove (Leptotila verreauxi) is polytypic species with 13 subspecies. Four these have recorded Mexico, distribution three abuts at IT, suggesting contact zone. To estimate phylogenetic patterns, times genetic differentiation, we examined two mtDNA (ND2 COI) one nDNA (β-fibint 7) markers. We also used correlative ecological niche models (ENM) assess whether differences across IT may acted biogeographical boundary. estimated paleodistributions during Middle Holocene, Last Glacial Maximum Interglacial, evaluate influence climate changes on demographic changes. Our results showed genetically distinct lineages that diverged approximately 2.5 million years ago. Climatic factors played dual role promoting but formation secondary zone southern IT. comparisons indicated sympatric are not identical, niches divergence; addition, environmental region no abrupt biogeographic barriers, presence regions low suitability. These suggest differentiation originated by vicariant event probably related favored evolution different niches. Also, absence barrier less suitable areas regions, zones be maintained climatic eastern group, interactions western group.

Language: Английский

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A phylogenomic investigation into the biogeography of the Mexico–eastern U.S. disjunction in Symphyotrichum

American Journal of Botany, Journal Year: 2025, Volume and Issue: unknown

Published: March 17, 2025

Abstract Premise Biotic disjunctions have attracted scientific attention for the past 200 years. Despite being represented in many familiar plants (such as bald cypress, flowering dogwood, sweetgum, partridgeberry, etc.), eastern North American (ENA)–Mexican (M) disjunction remains poorly understood. Major outstanding questions include divergence times of taxa exhibiting and environmental/geological processes that may underlie disjunction. Symphyotrichum Nees (Asteraceae), one most diverse genera USA, displays several examples disjunct ENA–M taxa. Methods We generated target capture data using Angiosperms353 baitset first well‐sampled phylogenomic hypothesis its close relatives. Focusing on S . subgenus Virgulus , we used MCMC TREE to perform time estimation R package BioGeoBEARS infer ancestral regions biogeographic transitions between America Mexico. Finally, niche reconstruction method Utremi test a role historical aridification generating Results Our molecular suggest recent radiation at Plio‐Pleistocene boundary (~2.5 mya), with early connections Mexico lineages closed off shortly after were followed by vicariance across this region. Except some present‐day broadly distributed species, there is complete lack movement ENA M ~0.5 mya. Conclusions A reconstructed distribution suitable habitat Pleistocene climatic models corroborates results from modeling confirms glacial cycles are more likely be associated breakup connections.

Language: Английский

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Phylogenomic Analysis of Wide‐Ranging Least Shrews Refines Conservation Priorities and Supports a Paradigm for Evolution of Biota Spanning Eastern North America and Mesoamerica

Ecology and Evolution, Journal Year: 2025, Volume and Issue: 15(5)

Published: May 1, 2025

ABSTRACT Anthropogenic global change is impacting the evolutionary potential of biodiversity in ways that have been difficult to predict. Distinct units within species may respond differently same environmental trends, reflecting unique geography, ecology, adaptation, or drift. Least shrews ( Cryptotis parvus group) a widespread distribution across North America, yet systematic relationships and ongoing processes remain unresolved. Westernmost peripheral populations prioritized for conservation, but little known their histories population trajectories. The broad range this group coincident with many other temperate taxa, presenting hypothesis diversification least follows repeated process through Pleistocene, leading regionally diagnosable conservation units. We use genomic data niche modeling delimit shrews. Our results show warrant recognition as multiple distinct species, along geographically discrete infraspecific lineages C. (sensu stricto). Western are evolutionarily based on nuclear, not mitochondrial data, possibly capture during last glacial phase. This represents relict unit, consistent both an “adaptive unit” “management non‐neutral neutral divergence, respectively. Hindcast supports growing evidence shared among co‐distributed biota, forecast suggests continued future loss suitable regions. Given mito‐nuclear discordance samples parapatric lineages, perturbation continue impact integrity important units, making ecological monitoring critical need.

Language: Английский

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Pliocene seeds of Passiflora subgenus Decaloba (Gray Fossil Site, Tennessee) and the impact of the fossil record on understanding the diversification and biogeography of Passiflora

American Journal of Botany, Journal Year: 2023, Volume and Issue: 110(3)

Published: Feb. 3, 2023

Passiflora is a diverse genus of ~570 extant species primarily distributed in the Americas, from eastern United States to Argentina and Chile. Nevertheless, known fossil record small. To date, only two seed have been unequivocally assigned genus. In this contribution, rare sulcate seeds Gray Fossil Site are described as third Passiflora.Three partial with sculpture Site, early Pliocene, Tennessee, USA, were examined, photographed, measured. They compared samples six supersection Decaloba. A broader survey produced by modern subgenera Decaloba, Deidamioides, Tryphostemmatoides was done using published illustrations descriptions.The sulcatasperma, sp. nov., subgenus characterized their small size, elliptical shape, ridged-and-sulcate sculpture, rugulose ridges, thin palisade coat.The largest can be identified Neogene fossils. Subgenus Decaloba represented species, P. bulgarica (Miocene, Bulgaria) sulcatasperma (Pliocene, USA). pollen Brazil) appalachiana The distributions suggest that may used both North Atlantic Antarctic routes expand into Europe Asian-Oceanian Paleotropics, respectively.

Language: Английский

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Fossil seeds of Passiflora L.: An Oligocene record of a new species and a Pleistocene record of a modern species from the Gulf of Mexico Coastal Plain

Review of Palaeobotany and Palynology, Journal Year: 2024, Volume and Issue: 324, P. 105093 - 105093

Published: March 13, 2024

Language: Английский

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Variación morfológica foliar de Brickellia sección Barroetea (A. Gray) E.E. Schill. & R. Scott y especies afines

Botanical Sciences, Journal Year: 2023, Volume and Issue: 102(1), P. 189 - 210

Published: Nov. 14, 2023

Antecedentes: Las hojas han sido utilizadas para definir secciones en el género Brickellia, lo que permite postular su valor taxonómico grupos monofiléticos, así como identificar grado de similitud morfológica entre especies y un contexto filogenético. Preguntas: ¿Las Brickellia sección Barroetea se pueden diferenciar con las formas láminas foliares? ¿La reconoce demás del base la forma foliar?, ¿las foliares son rasgo conservado Brickellia? Especies estudio: Se utilizaron seis 19 otras géneros relacionados (Ageratina Carminatia). Métodos: realizó análisis linear discriminante filomorfoespacio conocer diferencias evaluar conservación foliar. Resultados: presentaron significativas a nivel específico, excepto sonorana. evaluadas Barroetea, Coleosanthus, Leptanthodium Xerobrickellia tienden ovado-deltoideas, Microphyllae donde reniformes, Phanerostylis ovadas o elípticas Gemmipedium Kuhnia lineares. El muestra traslape analizadas; ancestrales muestran cambio morfológico mayor reciente diversificación foliar no confirmó estadísticamente. Conclusiones: La mayoría ellas, pero Brickellia. conservan género.

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