Geologically recent rearrangements in central Amazonian river network and their importance for the riverine barrier hypothesis

Ruokolainen, Kalle; Moulatlet, Gabriel M.; Zuquim, Gabriela; Hoorn, Carina; Tuomisto, Hanna

doi:10.21425/f5fbg45046

Cited by 58 publications

(92 citation statements)

References 35 publications

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“…5, but see Maximiano et al 2020), which indicates that this river does not isolate communities as effectively as the Amazon river. Tributaries of the Amazon River are generally narrower and have been more dynamic over time (Ruokolainen et al 2019;Rossetti et al 2014;Hoorn et al 2017), which results in a weaker effect compared to the Amazon River. Our results indicate that the Amazon River, which is the oldest, widest and with the largest discharge, has a stronger effect on species distribution and observed biogeographic patterns, whereas younger and more dynamic tributaries have weaker or no effect on most biological groups (but see e.g., Maximiano et al 2020 andSilva et al 2019).…”

Section: Riverine Barriersmentioning

confidence: 99%

The role of environmental filtering, geographic distance and dispersal barriers in shaping the turnover of plant and animal species in Amazonia

et al. 2020

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To determine the effect of rivers, environmental conditions, and isolation by distance on the distribution of species in Amazonia. Location: Brazilian Amazonia. Time period: Current. Major taxa studied: Birds, fishes, bats, ants, termites, butterflies, ferns + lycophytes, gingers and palms. We compiled a unique dataset of biotic and abiotic information from 822 plots spread over the Brazilian Amazon. We evaluated the effects of environment, geographic distance and dispersal barriers (rivers) on assemblage composition of animal and plant taxa using multivariate techniques and distance- and raw-data-based regression approaches. Environmental variables (soil/water), geographic distance, and rivers were associated with the distribution of most taxa. The wide and relatively old Amazon River tended to determine differences in community composition for most biological groups. Despite this association, environment and geographic distance were generally more important than rivers in explaining the changes in species composition. The results from multi-taxa comparisons suggest that variation in community composition in Amazonia reflects both dispersal limitation (isolation by distance or by large rivers) and the adaptation of species to local environmental conditions. Larger and older river barriers influenced the distribution of species. However, in general this effect is weaker than the effects of environmental gradients or geographical distance at broad scales in Amazonia, but the relative importance of each of these processes varies among biological groups.

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Section: Riverine Barriersmentioning

confidence: 99%

The role of environmental filtering, geographic distance and dispersal barriers in shaping the turnover of plant and animal species in Amazonia

et al. 2020

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“…In other words, when we applied the Z1 randomization procedure, the removal of the sampling effect from the whole phylogeny at the scale of the entire NW Amazonia increased the capability to detect closely related species coexisting in a particular site. Thus, the NTI clustering trend suggests more recent events, such as the relatively recent change in the channel location of big and medium size rivers (Ruokolainen et al., 2019), have acted as effective geographical barriers and constrained plant dispersal. These findings also suggest that small peripheral populations isolated by distance could act as an important source of speciation (Hubbell, 2001; Rosindell et al., 2010).…”

Section: Discussionmentioning

confidence: 99%

“…Overall, the trade‐off between lineage age and the time of formation of physical barriers (e.g. big rivers) often shapes lineage distributions across geographical space (Ruokolainen et al., 2019). For lineages that originated before the presence of geographical barriers, dispersal may be paramount determining the phylogenetic structure of the whole meta‐community at large spatial scales (Dexter et al., 2017).…”

Section: Introductionmentioning

confidence: 99%

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Scale‐dependent drivers of the phylogenetic structure and similarity of tree communities in northwestern Amazonia

et al. 2020

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The extent to which historical dispersal, environmental features and geographical barriers shape the phylogenetic structure and turnover of tree communities in northwestern Amazonia at multiple spatial scales remains poorly understood. We used 85 floristically standardized 0.1‐ha plots (DBH ≥ 2.5 cm) distributed in three subregions of northwestern (NW) Amazonia across three main habitat types (floodplain, swamp and terra firme forests) to hypothesize that (a) historical dispersal overcome geographical barriers, which meant low local phylogenetic relatedness and low phylogenetic turnover. (b) Geographical barriers triggered dispersal limitation, causing high local and subregional phylogenetic clustering and high regional phylogenetic turnover. (c) Edaphic properties and flooding were negatively associated with stem size and determined the tree phylogenetic structure and turnover at local and regional scales in Amazon forests. We found that the extent to which environmental or evolutionary features shaped the phylogenetic structure and phylogenetic similarity of tree communities in NW Amazonia was scale dependent. Specifically, we show that the relative importance of environmental factors increases as spatial scale and species pool decreases. Furthermore, we find that these results are generally robust for both adult and juvenile trees. Synthesis. Our analysis at the regional (NW Amazon) scale lends support to the idea of Amazonian forests as a large meta‐community primarily structured by historical dispersal at large spatial scales with an increasing importance of environmental factors at finer spatial scales. The convergence of ancestral lineages across habitat types may have been due to the relatively recent formation of geographical barriers that promoted local isolation and allopatric speciation.

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“…The Tapajos, Madeira, and other rivers in Amazonia—which often form the boundaries between geographically adjacent taxa—may have shifted their drainage patterns periodically through the Pleistocene (Hayakawa and Rossetti ; Ruokolainen et al. ) resulting in the current allopatry between taxa that were once in contact and able to introgress. Interestingly, our sample included three individuals of D. f. neglecta that occurred on the eastern bank of the Madeira River (MPDS 616, 748, and 749 representing the first record of this taxon on the eastern bank) within the Aripaunã‐Machado mini‐interfluve.…”

Section: Discussionmentioning

confidence: 99%

Genomic data reveal a protracted window of introgression during the diversification of a neotropical woodcreeper radiation*

2020

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The incidence of introgression during the diversification process and the timespan following divergence when introgression is possible are poorly understood in the neotropics where high species richness could provide extensive opportunities for genetic exchange. We used thousands of genome-wide SNPs to infer phylogenetic relationships, calculate ages of splitting, and to estimate the timing of introgression in a widespread avian neotropical genus of woodcreepers. Five distinct introgression events were reconstructed involving taxa classified both as subspecies and species including lineages descending from the basal-most split, dated to 7.3 million years ago. Introgression occurred between just a few hundred thousand to about 2.5 million years following divergence, suggesting substantial portions of the genome are capable of introgressing across taxa boundaries during a protracted time window of a few million years following divergence. Despite this protracted time window, we found that the proportion of the genome introgressing (6-11%) declines with the time of introgression following divergence, suggesting that the genome becomes progressively more immune to introgression as reproductive isolation increases. , hybridization, speciation, Dendrocincla, Neotropics. K E Y W O R D S : introgression

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Geologically recent rearrangements in central Amazonian river network and their importance for the riverine barrier hypothesis

Cited by 58 publications

References 35 publications

The role of environmental filtering, geographic distance and dispersal barriers in shaping the turnover of plant and animal species in Amazonia

The role of environmental filtering, geographic distance and dispersal barriers in shaping the turnover of plant and animal species in Amazonia

Scale‐dependent drivers of the phylogenetic structure and similarity of tree communities in northwestern Amazonia

Genomic data reveal a protracted window of introgression during the diversification of a neotropical woodcreeper radiation*

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