The riverine thruway hypothesis: rivers as a key mediator of gene flow for the aquatic paradoxical frog Pseudis tocantins (Anura, Hylidae)

Fonseca, Emanuel Masiero da; Garda, Adrian Antonio; Oliveira, Eliana Faria de; Camurugi, Felipe; Magalhães, Felipe de Medeiros; Lanna, Flávia M.; Zurano, Juan Pablo; Marques, Ricardo; Vences, Miguel; Gehara, Marcelo

doi:10.1007/s10980-021-01257-z

Cited by 15 publications

(8 citation statements)

References 54 publications

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“…Future work explicitly testing pulse migration versus continuous migration models of gene flow may help clarify the relative contributions of these two nonmutually exclusive mechanisms. Nevertheless, the explicit assumption of the framework presented here is that the underlying lowland riverine landscape is not stable, which has also been confirmed, for instance, on the easternmost Amazonian part of the Brazilian Shield (66,67). Within this conceptual framework, drainage network evolution is a simple solution to the question of how secondary contact occurs between differentiated taxa that are otherwise isolated by rivers.…”

Section: Limitations and Future Directionsmentioning

confidence: 63%

River network rearrangements promote speciation in lowland Amazonian birds

et al. 2022

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Large Amazonian rivers impede dispersal for many species, but lowland river networks frequently rearrange, thereby altering the location and effectiveness of river barriers through time. These rearrangements may promote biotic diversification by facilitating episodic allopatry and secondary contact among populations. We sequenced genome-wide markers to evaluate the histories of divergence and introgression in six Amazonian avian species complexes. We first tested the assumption that rivers are barriers for these taxa and found that even relatively small rivers facilitate divergence. We then tested whether species diverged with gene flow and recovered reticulate histories for all species, including one potential case of hybrid speciation. Our results support the hypothesis that river rearrangements promote speciation and reveal that many rainforest taxa are micro-endemic, unrecognized, and thus threatened with imminent extinction. We propose that Amazonian hyper-diversity originates partly from fine-scale barrier displacement processes—including river dynamics—which allow small populations to differentiate and disperse into secondary contact.

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Section: Limitations and Future Directionsmentioning

confidence: 63%

River network rearrangements promote speciation in lowland Amazonian birds

et al. 2022

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“…We find a great deal of concordance among landscape genetics inferences at the 1225‐, 2500‐ and 4225‐km 2 spatial scales in both our visual assessment of the circuitscape surfaces and based on correlation tests, where river canyons appear to be important features maintaining genetic connectivity. In this case, it appears that the abiotic environment within river canyons—higher temperatures, less seasonality in temperature and precipitation, less rugged areas—are the landscape features that promote connectivity, rather than the rivers within the canyons themselves, as is presumably the case for amphibians such as the foothill yellow‐legged frog ( Rana boylii ; Lind et al, 2011) and the aquatic paradoxical frog ( Pseudis tocantins ; Fonseca et al, 2021). The larger spatial scale circuitscape layer at 6400 km 2 also largely identified river canyons as facilitators to gene flow, but demonstrated a low correlation with the other spatial layers (Table 1).…”

Section: Discussionmentioning

confidence: 99%

Biogeographic inferences across spatial and evolutionary scales

Wishingrad

Thomson

2023

Molecular Ecology

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The field of biogeography unites landscape genetics and phylogeography under a common conceptual framework. Landscape genetics traditionally focuses on recent‐time, population‐based, spatial genetics processes at small geographical scales, while phylogeography typically investigates deep past, lineage‐ and species‐based processes at large geographical scales. Here, we evaluate the link between landscape genetics and phylogeographical methods using the western fence lizard (Sceloporus occidentalis) as a model species. First, we conducted replicated landscape genetics studies across several geographical scales to investigate how population genetics inferences change depending on the spatial extent of the study area. Then, we carried out a phylogeographical study of population structure at two evolutionary scales informed by inferences derived from landscape genetics results to identify concordance and conflict between these sets of methods. We found significant concordance in landscape genetics processes at all but the largest geographical scale. Phylogeographical results indicate major clades are restricted to distinct river drainages or distinct hydrological regions. At a more recent timescale, we find minor clades are restricted to single river canyons in the majority of cases, while the remainder of river canyons include samples from at most two clades. Overall, the broad‐scale pattern implicating stream and river valleys as key features linking populations in the landscape genetics results, and high degree of clade specificity within major topographic subdivisions in the phylogeographical results, is consistent. As landscape genetics and phylogeography share many of the same objectives, synthesizing theory, models and methods between these fields will help bring about a better understanding of ecological and evolutionary processes structuring genetic variation across space and time.

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“…Dispersal primarily along creek lines (2) rather than through terrestrial landscapes may contribute to isolation of populations. For some aquatic and semi aquatic species, patterns of gene ow re ect the hierarchical nature of river systems and/or the isolation of populations to independent river basins or drainages (Brauer et al 2016;Coa et al 2020;Fonseca et al 2021). Whilst the river catchments on the Woronora Plateau are geographically close to each other, they are parts of different major river drainages (Fig.…”

Section: Population Structurementioning

confidence: 99%

Genome-wide SNPs reveals inbreeding, small populations, and strong genetic isolation in a threatened frog (Litoria littlejohni)

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Klop‐Toker

Wallace

et al. 2022

Preprint

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The status of many amphibian populations remains unclear due to undetected declines driven by disease and difficulties in obtaining accurate population estimates. Here, we used genetic data (Single Nucleotide Polymorphisms) to investigate Australia’s poorly understood Littlejohn’s treefrog, Litoria littlejohni across its fragmented distribution. We detected five identifiable genetic clusters, with moderate to strong genetic isolation. At a regional scale, population isolation likely of population crashes, resulting in small populations with evidence of founder effects. Moderate genetic isolation was detected among populations on the Woronora Plateau despite short distances between population clusters. Evidence of recent declines was apparent in three populations that had very small effective population size, reduced genetic diversity and high inbreeding values. The rates of inbreeding detected in these populations combined with their small size leave these populations at elevated risk of extinction. The Cordeaux Cluster was identified as the most robust population as it was the largest and most genetically diverse. This study exemplifies the value of employing genetic methods to study rare, cryptic species. Despite low recapture rates using traditional capture-recapture demographic methods, we were able to derive population estimates, describe patterns of gene flow, and demonstrate the need for urgent conservation management.

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The riverine thruway hypothesis: rivers as a key mediator of gene flow for the aquatic paradoxical frog Pseudis tocantins (Anura, Hylidae)

Cited by 15 publications

References 54 publications

River network rearrangements promote speciation in lowland Amazonian birds

River network rearrangements promote speciation in lowland Amazonian birds

Biogeographic inferences across spatial and evolutionary scales

Genome-wide SNPs reveals inbreeding, small populations, and strong genetic isolation in a threatened frog (Litoria littlejohni)

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