Gene flow and rapid differentiation characterize a rapid insular radiation in the southwest Pacific (Aves:Zosterops)

Evolution, Journal Year: 2020, Volume and Issue: 74(8), P. 1788 - 1803

Published: June 15, 2020

As a dispersive lineage expands its distribution across heterogeneous landscape, it leaves behind allopatric populations with varying degrees of geographic isolation that often differentiate rapidly. In the case oceanic islands, even narrowly separated differentiate, which seems contrary to highly nature founding lineage. This pattern lineages differentiating narrow sea barriers has perplexed biologists for more than century. We used two reduced-representation genomic datasets examine diversification recent, rapid radiation, white-eyes (Aves: Zosterops) Solomon Islands. incorporated methods targeted phylogenetic structure, population and explicit tests gene flow. Both showed evidence flow among species, but not involving closely spaced islands in New Georgia Group. Instead, occurred larger archipelago, including those recently connected by land bridges as well isolated large expanses deep ocean. Populations shallow seas, during glacial cycles, ranged from no differentiation both phenotypic differentiation. These complex patterns divergence support model radiation differentially evolve dispersal disparity differences.

Language: Английский

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Sundaland's east–west rain forest population structure: variable manifestations in four polytypic bird species examined using RAD‐Seq and plumage analyses

Journal of Biogeography, Journal Year: 2017, Volume and Issue: 44(10), P. 2259 - 2271

Published: May 28, 2017

Abstract Aim A current model of rain forest population diversification in Sundaland specifies east–west vicariance into refugia during the early Pleistocene. In some taxa, this division was followed by dispersal and apparent secondary contact on Borneo late To investigate genetic, morphological, spatial temporal characteristics model, we compared genomic plumage variation among four bird species with mt DNA structure. Location western (Sumatra Malay Peninsula). Methods We quantified patterns populations two muscicapids ( Copsychus saularis Kittacincla malabarica ) timaliids Mixornis gularis Trichastoma malaccense ), them genetic determined from (1) SNP s produced RAD ‐Seq (2) previously sequenced . Results All exhibit morphological characters, but are idiosyncratic. saularis’ change gradually across Borneo, comparisons indicate no K. , all three abruptly concurrently Borneo. M. main break occurs between Sundaland, marginal structure T. exhibits distinct transitions, an Pleistocene a Pliocene north‐east rest Despite deep division, its changes clinally Main conclusions Mt may vary depending such factors as pre‐Pleistocene distribution, habitat requirements propensity, differential introgression character types, selection phylogenetic relationships.

Language: Английский

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Interglacial refugia on tropical mountains: Novel insights from the summit rat (Rattus baluensis), a Borneo mountain endemic

Diversity and Distributions, Journal Year: 2018, Volume and Issue: 24(9), P. 1252 - 1266

Published: April 26, 2018

Abstract Aim The genetics of organisms currently isolated in refugia has received little attention compared to post‐glacial expansions. We study the population history and connectivity a rat endemic montane habitat Borneo better understand potential populations interglacial mountain refugia. Location Sabah, Borneo, Malaysia. Methods performed field survey summit ( Rattus baluensis ) on two mountains, Mt. Kinabalu Tambuyukon, its entire known distribution. sequenced mitogenomes 27 introns (19 which were polymorphic) 49 individuals from both populations. analysed their current genetic structure diversity, inferred demographic with approximate Bayesian computation. Results Summit rats tightly associated mossy forest scrubland above 2,000 m, facilitating prediction past future distributions. analysis supports Holocene fragmentation larger into smaller ones that are now mountaintops. These findings consistent climatic reconstructions retreat upland higher elevations after Last Glacial Maximum LGM ), ~21 kya. Main conclusions formed through shift . trend global warming will likely lead diminishing suitable result extinction Tambuyukon. Kinabalu, peak, could persist at elevations, highlighting singular value high tropical mountains as reservoirs biodiversity during ongoing climate change.

Language: Английский

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Endemism and diversity of small mammals along two neighboring Bornean mountains

PeerJ, Journal Year: 2019, Volume and Issue: 7, P. e7858 - e7858

Published: Oct. 8, 2019

Mountains offer replicated units with large biotic and abiotic gradients in a reduced spatial scale. This transforms them into well-suited scenarios to evaluate biogeographic theories. Mountain biogeography is hot topic of research many theories have been proposed describe the changes biodiversity elevation. Geometric constraints, which predict highest diversity occur mid-elevations, focal part this discussion. Despite this, there no general theory explain these patterns, probably because interaction among different predictors local effects historical factors. We characterize small non-volant mammals across elevational gradient on Mount (Mt.) Kinabalu (4,095 m) Mt. Tambuyukon (2,579 m), two neighboring mountains Borneo, Malaysia. documented decrease species richness elevation deviates from expectations geometric constraints suggests that factors (e.g., larger areas) are important. The lowland mammal community was replaced higher elevations (from above ~1,900 montane communities consisting mainly high Borneo endemics. positive correlation we find between endemism concordant hypothesis predicts topographical isolation. supports lineage history geographic could be important drivers region.

Language: Английский

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Biotic interactions help explain variation in elevational range limits of birds among Bornean mountains

Journal of Biogeography, Journal Year: 2020, Volume and Issue: 47(3), P. 760 - 771

Published: Jan. 7, 2020

Abstract Aim Physiological tolerances and biotic interactions along habitat gradients are thought to influence species occurrence. Distributional differences caused by such forces particularly noticeable on tropical mountains, where high turnover elevational occurs over relatively short distances distributions of particular can shift among mountains. Such shifts interpreted as evidence the importance spatial variation in interspecific competition or climatic gradients. To assess relative compression zones setting range limits, we examined ranges forest bird four Bornean mountains with distinct features. Location Kinabalu, Mulu, Pueh Topap Oso. Taxon Rain communities Methods We surveyed rain birds Borneo test which environmental variables—habitat zone presence likely competitors—best predicted For this purpose, used two complementary tests: a comparison limits between pairs linear mixed models naïve occupancy response variable. Results found that lowland occur higher elevation small compared Mt. Mulu. This result is inconsistent expectation habitats elevationally compressed but consistent hypothesis reduction (likely diffuse) largely lack montane specialist species, allows elevation. The changes elevation, correlation lower distribution their competitors was weaker than species. Main conclusions These findings provide support for although abiotic explain majority patterns. Thus, predicting under climate change scenarios must include not only variables, currently most common, also information potentially resulting interactions, especially

Language: Английский

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Opening the door to greater phylogeographic inference in Southeast Asia: Comparative genomic study of five codistributed rainforest bird species using target capture and historical DNA

Ecology and Evolution, Journal Year: 2020, Volume and Issue: 10(7), P. 3222 - 3247

Published: March 6, 2020

Abstract Indochina and Sundaland are biologically diverse, interconnected regions of Southeast Asia with complex geographic histories. Few studies have examined phylogeography bird species that span the two because inadequate population sampling. To determine how barriers/events disparate dispersal potential influenced structure, gene flow, demographics occupy entire area, we studied five largely codistributed rainforest species: Arachnothera longirostra , Irena puella Brachypodius atriceps Niltava grandis Stachyris nigriceps . We accomplished relatively thorough sampling data collection by sequencing ultraconserved elements (UCEs) using DNA extracted from modern older (historical) specimens. obtained a genome‐wide set 753–4,501 variable loci 3,919–18,472 single nucleotide polymorphisms. The formation major within‐species lineages occurred within similar time (0.5–1.5 mya). Major patterns in genetic structure consistent habitat requirements study species. A break across Isthmus Kra was shared only hill/submontane insectivores ( N. S. ). Across Sundaland, there is little B. which eurytopic partially frugivorous often utilizes forest edges. Two other species, A. I. possess highly divergent populations peripheral Sunda Islands (Java and/or Palawan) India. These probably intermediate abilities allowed them to colonize new areas, then remained isolated subsequently. also observed an east–west very different potential. By analyzing high‐throughput data, our provides unprecedented comparative perspective on process avian divergence Asia, determined geography, characteristics, stochastic nature vicariance events.

Language: Английский

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Evolutionary and ecological forces influencing population diversification in Bornean montane passerines

Molecular Phylogenetics and Evolution, Journal Year: 2017, Volume and Issue: 113, P. 139 - 149

Published: May 22, 2017

Language: Английский

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Preliminary assessment of community composition and phylogeographic relationships of the birds of the Meratus Mountains, south-east borneo, Indonesia

Bulletin of the British Ornithologists Club, Journal Year: 2018, Volume and Issue: 138(1), P. 45 - 66

Published: March 1, 2018

The Meratus Mountains of south-east Borneo are biogeographically interesting due to their isolation and potential endemicity. However, Meratus' birds have never been quantitatively surveyed or collected, so we know little community structure taxonomy. In May 2017, visited Mt. Besar in the range assess its avifauna collect specimens for phylogeographic study. Here, report on Besar's provide preliminary ND2-sequence assessments relationships. We recorded 89 species, which collected 68 species; 17 represented distributional extensions. avian is depauperate compared Borneo's main mountains, several species exhibit unusual elevational abundance patterns. attribute these findings range's small area, low elevation, from other depleted surrounding native lowland forest, exploitation food pet-trading. ND2 comparisons indicate that at least 12 population merits additional

Language: Английский

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Geomorphic impacts within Red River Fault and island shifting as witnessed by the phylogeography of the largest water strider

Molecular Phylogenetics and Evolution, Journal Year: 2024, Volume and Issue: 195, P. 108062 - 108062

Published: March 13, 2024

Language: Английский

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Little genetic structure in a Bornean endemic small mammal across a steep ecological gradient

Molecular Ecology, Journal Year: 2020, Volume and Issue: 29(21), P. 4074 - 4090

Published: Sept. 21, 2020

Janzen's influential "mountain passes are higher in the tropics" hypothesis predicts restricted gene flow and genetic isolation among populations spanning elevational gradients tropics. Few studies have tested this prediction, that focus on population structure Southeast Asia particularly underrepresented literature. Here, we test mountain treeshrews (Tupaia montana) exhibit limited dispersal across their broad range which spans ~2,300 m two peaks Kinabalu National Park (KNP) Borneo: Mt Tambuyukon (MT) (MK). We sampled 83 individuals elevations both performed genomics analyses mitogenomes single nucleotide polymorphisms from 4,106 ultraconserved element loci. detected weak infer between peaks. found differentiation MT than MK despite its lower elevation associated environmental variation. This implies that, contrary to our hypothesis, system is not primarily shaped by elevation. propose pattern may instead be result of historical processes upslope MT. Importantly, results serve as a foundational estimate diversity track potential future effects climate change KNP, an important conservation stronghold for treeshrew other montane species.

Language: Английский

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