Cloudy with a chance of speciation: integrative taxonomy reveals extraordinary divergence within a Mesoamerican cloud forest bird

Biological Journal of the Linnean Society, Год журнала: 2018, Номер 126(1), С. 1 - 15

Опубликована: Сен. 22, 2018

The highlands of Mesoamerica harbour some the highest biodiversity in world, especially cloud forests, but landscape drivers this diversification are not well known. Taxonomy region has been challenging owing to a lack consensus about how test species limits. We apply integrative taxonomy an emblematic Mesoamerican unicolored jay (Aphelocoma unicolor). assess divergence along three complementary axes (genetics, phenotype and ecological niche), finding evidence for differentiation among five lineages, currently described as subspecies, isolated forest patches. DNA suggests that these lineages have long histories divergence. Multivariate analysis phenotype, with objective method detecting phenotypic clusters, suggest at least four diagnosable. There was also pattern increasing through time. observed is comparable other species-level divergences genus, arguing elevation two, many four, within A. unicolor rank. According our time tree, patches became starting Pliocene continuing into Pleistocene, suggesting glacial cycles main speciation.

Язык: Английский

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Finding complexity in complexes: Assessing the causes of mitonuclear discordance in a problematic species complex of Mesoamerican toads

Molecular Ecology, Год журнала: 2020, Номер 29(18), С. 3543 - 3559

Опубликована: Июнь 5, 2020

Abstract Mitonuclear discordance is a frequently encountered pattern in phylogeographic studies and occurs when mitochondrial nuclear DNA display conflicting signals. Discordance among these genetic markers can be caused by several factors including confounded taxonomies, gene flow, incomplete lineage sorting. In this study, we present strong case of mitonuclear species complex toads (Bufonidae: Incilius coccifer complex) found the Chortís Block Central America. To determine cause complex, used spatially explicit data to test limits relationships, characterize demographic history, quantify flow. We extensive three recognized within group, especially populations Highlands Honduras. Our reveal introgression that was most probably driven cyclical range expansions due climatic fluctuations. Though determined occurred genome, our suggest it not key factor driving entire complex. Rather, lack discernible geographic between DNA, as well relatively recent divergence time concluded has been study provides framework sources highlights importance using multiple marker types boundaries cryptic species.

Язык: Английский

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Amphibian Speciation Rates Support a General Role of Mountains as Biodiversity Pumps

The American Naturalist, Год журнала: 2021, Номер 198(3), С. E68 - E79

Опубликована: Май 21, 2021

AbstractContinental mountain areas cover <15% of global land surface, yet these regions concentrate >80% terrestrial diversity. One prominent hypothesis to explain this pattern proposes that high diversities could be explained by higher diversification rates in topographic complexity (HTC). While speciation mountains has been detected for particular clades and regions, the extent which lineages experience faster remains unknown. Here we addressed issue using amphibians as a model system (>7,000 species), found families showing contain proportion species distributed mountains. Moreover, inhabiting HTC speciate than occupying are topographically less complex. When comparing across identified same five biogeographical realms where associated with levels complex topography. Low-magnitude differences between some low topographies suggest diversity is also affected extinction and/or colonization rates. Nevertheless, our results bolster importance engines at different geographical scales highlight their conservation biodiversity.

Язык: Английский

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Historical and current introgression in a Mesoamerican hummingbird species complex: a biogeographic perspective

PeerJ, Год журнала: 2015, Номер 4, С. e1556 - e1556

Опубликована: Янв. 12, 2015

The influence of geologic and Pleistocene glacial cycles might result in morphological genetic complex scenarios the biota Mesoamerican region. We tested whether berylline, blue-tailed steely-blue hummingbirds, Amazilia beryllina , cyanura saucerottei show evidence historical or current introgression as their plumage colour variation suggest. also analysed role past present climatic events promoting species diversification. collected mitochondrial DNA (mtDNA) sequence data microsatellite loci scores for populations throughout range three species, well ecological data. Haplotype network, Bayesian phylogenetic divergence time inference, demography, palaeodistribution modelling, niche tests were used to reconstruct evolutionary history this complex. An isolation-with-migration coalescent model assignment analysis assessed determine admixture. mtDNA haplotypes geographically unstructured, with from disparate areas interdispersed on a shallow tree an unresolved haplotype network. Assignment nuclear genome (nuDNA) supported groups signs admixture, corresponding to: (1) A. located west Isthmus Tehuantepec; (2) between Tehuantepec Nicaraguan Depression (Nuclear Central America); (3) southeast Depression. Gene flow estimates, demographic patterns suggest mediated by Quaternary fluctuations. High levels gene indicated asymmetrical isolation-with-migration, whereas analyses found clusters distributions isolation Historical migration genetically distinct estimated using microsatellites higher than contemporary migration. These results support scenario secondary contact during periods strongly imply that high structure currently observed are consequence limited dispersal these hummingbirds across isthmus depression barriers.

Язык: Английский

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Wild vertebrate roadkill in northern Central America: a first assessment using citizen science data

Oryx, Год журнала: 2025, Номер unknown, С. 1 - 9

Опубликована: Май 19, 2025

Abstract Roads are vital for the economic development of countries but they pose major problems wildlife. The road network in Central America is expanding, yet information about wildlife–vehicle collisions scarce. We compiled data on vertebrate with vehicles Guatemala, El Salvador and Honduras, from projects created citizen science platform iNaturalist, to provide first assessment how these species affected by roads northern America. Our gathered 670 wildlife roadkill records that had been logged 95 users across three countries, 122 identified. Mammals reptiles represented 44 30% records, respectively, opossums Didelphis spp. Philander vossi , common boa Boa constrictor neotropical whip snake Masticophis mentovarius being most frequently reported (112, 28, 43 23 respectively). One recorded categorized as globally Endangered IUCN Red List, two Vulnerable, four Near Threatened have not evaluated. Forty-six listed or nationally. This study which both members public specialists contributed, underscoring value engagement science. urge further impacts this region using standardized methods identify rates hotspots, implementation mitigation measures existing planned region.

Язык: Английский

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The latitudinal variation in amphibian speciation rates revisited

Communications Biology, Год журнала: 2025, Номер 8(1)

Опубликована: Май 28, 2025

Abstract Speciation can increase regional species richness, however, our knowledge of how and why speciation rates vary across space is still incomplete. Using comprehensive information on distributions their phylogenetic relationships, we describe the global spatial patterns variation in amphibian explore ecological determinants. We find that overall mean amphibians with latitude. This pattern largely determined by anurans, most diverse order. Salamanders, nevertheless, speciate faster tropics, whereas caecilians did not exhibit any relationship Despite inverse latitudinal trend amphibians, tip-level maximum are necessarily restricted to higher latitudes be found different regions globe. Among bioregions, associated high past climatic velocity topographic complexity, both factors potentially promoting isolation, an important primer for speciation. Our results suggest emerging likely driven combination a few rapidly speciating clades distributed numerous lower showing heterogeneous that, when averaged, pull down estimations areas where they occur.

Язык: Английский

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The role of Central American barriers in shaping the evolutionary history of the northernmost glassfrog,Hyalinobatrachium fleischmanni(Anura: Centrolenidae)

PeerJ, Год журнала: 2019, Номер 7, С. e6115 - e6115

Опубликована: Янв. 3, 2019

The complex geological history of Central America has been useful for understanding the processes influencing distribution and diversity multiple groups organisms. Anurans are an excellent choice such studies because they typically exhibit site fidelity reduced movement. objective this work was to identify impact recognized geographic barriers on genetic structure, phylogeographic patterns divergence times a wide-ranging amphibian species, Hyalinobatrachium fleischmanni. We amplified three mitochondrial regions, two coding (COI ND1) one ribosomal (16S), in samples collected from coasts Veracruz Guerrero Mexico humid forests Chocó Ecuador. examined biogeographic species through spatial clustering analyses (Geneland sPCA), Bayesian maximum likelihood reconstructions, spatiotemporal diffusion analysis. Our data suggest American origin H. fleischmanni posterior independent dispersals towards North South regions. first clade comprises individuals Colombia, Ecuador, Panama sister tatayoi; shows little despite presence Andes mountain range long distances between sampling sites. second consists Costa Rica, Nicaragua, eastern Honduras with no apparent structure. third includes western Honduras, Guatemala, displays deep population Herein, we synthesize known areas that act as glassfrog dispersal demonstrated their effect differentiating into markedly isolated clades. observed structure is associated initial event followed by vicariance likely occurred during Pliocene. southern characterized very recent expansion, related sea-level climatic oscillations Pleistocene, whereas northern probably driven Isthmus Tehuantepec isolation Motagua-Polochic-Jocotán fault system Mexican highlands.

Язык: Английский

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Historical biogeography of New World passalid beetles (Coleoptera, Passalidae) reveals Mesoamerican tropical forests as a centre of origin and taxonomic diversification

Journal of Biogeography, Год журнала: 2021, Номер 48(8), С. 2037 - 2052

Опубликована: Май 13, 2021

Abstract Aim The fauna of Mesoamerica is extraordinarily species rich and exhibits a high degree local, regional high‐elevation endemism. Traditionally, this area has been seen as transition zone between the Nearctic Neotropical regions; in contrast, new data suggest that centre origin taxonomic diversification. For example, diversity genera Passalidae concentrated montane environments there are many locally endemic taxa; thus, suggested diversification for group. However, hypothesis not formally tested. Location New World tropics, with an emphasis on Mesoamerica. Taxon Coleoptera, (tribes Passalini Proculini) Methods We studied timing geographic patterns Passalidae. used DNA sequence from 3 genes (CAD, Wingless, 28S) 93 Passalidae, along information fossil record, to generate time‐calibrated phylogeny Additionally, we performed Ancestral Area Estimation State Reconstruction altitudinal distribution niche. Results divergence time analyses recovered much older estimated events than previously proposed. origins late Jurassic split Proculini during mid‐Cretaceous. Moreover, observed congruence clade major paleogeographical events; crown uplift emergence sea. Main conclusions Orogenic throughout Paleogene Neogene played role Nuclear Southern centres Proculini.

Язык: Английский

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Anticipating the potential impacts of Batrachochytrium salamandrivorans on Neotropical salamander diversity

Biotropica, Год журнала: 2021, Номер 54(1), С. 157 - 169

Опубликована: Ноя. 21, 2021

Abstract Emergent infectious disease caused by the fungal pathogens Batrachochytrium dendrobatidis ( Bd ) and salamandrivorans Bsal represents one of major causes biodiversity loss in amphibians. While has affected amphibians worldwide, remains restricted to Asia Europe, but also could be a threat for salamanders Western hemisphere, including 320 bolitoglossine species described. Here, we predict suitable areas Neotropics assess its potential impact on diversity. For this, determined geographic patterns taxonomic, phylogenetic, functional diversity bolitoglossines modeled distribution Neotropics. We identified which regions at risk from an eventual introduction region, quantified degree overlap between high conditions pathogen, considered IUCN Red List status, range size. found that are concentrated Trans‐Mexican Volcanic Belt, Sierra Madre Oriental, southern portion del Sur mountains Oaxaca México, as well Chiapan‐Guatemalan highlands, Cordilleras Costa Rica Panama. Alarmingly, over 75% ranges more threatened . Given unknown vulnerability these species, strongly recommend measures avoid continent. Spanish is available with online material.

Язык: Английский

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Taxonomic and functional diversity of the amphibian and reptile communities of the state of Durango, Mexico

Community Ecology, Год журнала: 2023, Номер 24(2), С. 229 - 242

Опубликована: Апрель 19, 2023

Язык: Английский

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