References of "Vanderpoorten, Alain"
     in
Bookmark and Share    
Full Text
Peer Reviewed
See detailMacroclimatic structuring of spatial phylogenetic turnover in liverworts
Collart, Flavien ULiege; Wang, Jian; Patiño, Jairo et al

in Ecography (2021)

Phylogenetic turnover has emerged as a powerful tool to identify the mechanisms by which biological communities assemble. When significantly structured along environmental gradients, phylogenetic turnover ... [more ▼]

Phylogenetic turnover has emerged as a powerful tool to identify the mechanisms by which biological communities assemble. When significantly structured along environmental gradients, phylogenetic turnover evidences phylogenetic niche conservatism, a critical principle explaining patterns of species distributions at different spatio-temporal scales. Here, we quantify the contribution of geographic or macroclimatic drivers to explain patterns of phylogenetic turnover in an entire phylum of land plants, namely liverworts. We further determine whether climatic niche conservatism has constrained the distribution of liverworts in the course of their evolutionary history. Two datasets, one insular, focused on 60 archipelagos and including 2346 species, and the second global, including 6334 species in 451 oceanic and continental Operational Geographic Units (OGUs) worldwide, were assembled. Phylogenetic turnover among OGUs was quantified through πst statistics. πst-throughtime profiles were generated at 1 myr intervals along the phylogenetic time-scale and used to compute the correlation between πst, current geographic distance and macroclimatic variation with Mantel tests based on Moran spectral randomization to control for spatial autocorrelation. The contribution of macroclimatic variation to phylogenetic turnover was about four-times higher than that of geographic distance, a pattern that was consistently observed in island and global geographic settings, and with datasets including or excluding species-poor OGUs. The correlation between phylogenetic turnover and geographic distance rapidly decayed at increasing phylogenetic depth, whereas the relationship with macroclimatic variation remained constant until 100 mya. Our analyses reveal that changes in the phylogenetic composition among liverwort floras across the globe are primarily shaped by macroclimatic variation. They demonstrate the relevance of macroclimatic niche conservatism for the assembly of liverwort floras over very large spatial and evolutionary time scales, which may explain why such a pervasive biodiversity pattern as the increase of species richness towards the tropics also applies to organisms with high dispersal capacities. [less ▲]

Detailed reference viewed: 46 (9 ULiège)
Full Text
Peer Reviewed
See detailIntraspecific differentiation: Implications for niche and distribution modelling
Collart, Flavien ULiege; Hedenäs, Lars; Brönnimann, Olivier et al

in Journal of Biogeography (2021), 48

Aim: Mounting evidence suggests that failure of species distribution models to integrate local adaptation hinders our ability to predict distribution ranges, raising the <br />question of whether ... [more ▼]

Aim: Mounting evidence suggests that failure of species distribution models to integrate local adaptation hinders our ability to predict distribution ranges, raising the <br />question of whether modelling should be performed at the level of species (clade <br />models) or intraspecific lineages (subclade models), characterized by the restricted <br />availability of occurrence points. While Ensembles of Small Models (ESMs) offer an <br />attractive framework for small datasets, their evaluation remains critical. We address <br />these issues in the case of very small datasets inherent to subclade models and discuss <br />which modelling strategy should be applied based on niche overlap among lineages. <br />Location: Sweden. <br />Taxon: Mosses. <br />Methods: Ensembles of Small Models were evaluated by null models built from randomly sampled presence points. We compared the extent of suitable area predicted <br />by the projections of clade and subclade models. Niche overlap was quantified using <br />Schoener's D and Hellinger'sImetrics, and the significance of these metrics in terms <br />of niche conservatism or divergence was assessed by similarity tests. <br />Results: We introduced a simple procedure for evaluating ESMs based on the pooling of the statistics used to assess model accuracy from the replicates. Despite fairly <br />high AUC and TSS values, 2 of the 23 subclade models did not perform better than <br />null models and should be discarded. Combined predictions from subclade models <br />contributed, on average, five times more than clade models to the total suitable area <br />predicted by the combination of subclade and clade models. The D and I metrics averaged 0.45 and 0.71, with evidence for niche conservatism in half of the species and <br />no signal for niche divergence. <br />Main conclusions: In addition to the assessment of ESM accuracy based on the simple procedure described here, we recommend that ESMs should be systematically <br />evaluated against null models. Lumping or splitting occurrence data at the intraspecific level substantially impacted model projections. Given the poor performance of <br />models based on small datasets, even when employing ESMs, we pragmatically suggest that, in the absence of evidence for niche divergence during diversification of <br />closely related intraspecific lineages, SDMs should be based on all available occurrence data at the species level. [less ▲]

Detailed reference viewed: 67 (26 ULiège)
Full Text
Peer Reviewed
See detailWelcome to migrants in a borderless Europe: bryophytes show the way to go
Vanderpoorten, Alain ULiege; Ledent, Alice ULiege; Patino, Jairo

in Revista Scientia Insularum (2020), 3

Reconstructing the Quaternary history of European bryophytes has long been challenging because, except for macro-remains preserved in peat, the fossil record is extremely poor as compared to vascular ... [more ▼]

Reconstructing the Quaternary history of European bryophytes has long been challenging because, except for macro-remains preserved in peat, the fossil record is extremely poor as compared to vascular plants. Coalescent simulations revealed that the postglacial assembly of European bryophytes involves a complex history from multiple sources, contrasting with the prevailing model of northwards species migration from Mediterranean refugia. A scenario of extra-European postglacial recolonization clearly emerged as dominant. A bulk of the bryoflora that pre-existed in Europe before the Ice Age was reinforced by allochthonous migrants. The Atlantic European fringe was, in contrast, de novo colonized by species primarily distributed across tropical areas. We hypothesize that, for the particular case of the oceanic bryophyte floristic element, the Macaronesian islands represented a mandatory stepping-stone situated midway between the tropics and Europe due to the necessity for tropical species to pre-adapt under insular warm-temperate conditions before they successfully establish in temperate regions. [less ▲]

Detailed reference viewed: 38 (5 ULiège)
Full Text
Peer Reviewed
See detailWhat do tropical cryptogams reveal? Strong genetic structure in Amazonian bryophytes
Ledent, Alice ULiege; Gauthier, Jérémy; Pereira, Marta et al

in New Phytologist (2020), 228(2), 640-650

Lowland tropical bryophytes have been perceived as excellent dispersers. In such groups, the inverse isolation hypothesis proposes that spatial genetic structure is erased beyond the limits of short ... [more ▼]

Lowland tropical bryophytes have been perceived as excellent dispersers. In such groups, the inverse isolation hypothesis proposes that spatial genetic structure is erased beyond the limits of short-distance dispersal. Here, we determine the relative influence of environmental variation and geographic barriers on the spatial genetic structure of a widely dispersed and phylogenetically independent sample of Amazonian bryophytes. • Single nucleotide polymorphism data were produced from a restriction site-associated DNA sequencing protocol for 10 species and analyzed through F-statistics and Mantel tests. • Neither isolation-by-environment nor the impact of geographic barriers were recovered from the analyses. However, significant isolation-by-distance patterns were observed for 8 out of the 10 investigated species beyond the scale of short-distance dispersal (>1 km), offering evidence contrary to the inverse isolation hypothesis. • Despite a cadre of life-history traits and distributional patterns suggesting that tropical bryophytes are highly vagile, our analyses reveal spatial genetic structures comparable to those documented for angiosperms, whose diaspores are orders of magnitude larger. Dispersal limitation for common, widespread tropical bryophytes flies in the face of traditional assumptions regarding bryophyte dispersal potential in tropical environments, and suggests that the plight of this component of cryptic biodiversity is more dire than previously considered in light of accelerated forest fragmentation in the Amazon. [less ▲]

Detailed reference viewed: 45 (12 ULiège)
Full Text
Peer Reviewed
See detailBryophytes are predicted to lag behind future climate change despite their high dispersal capacities
Zanatta, Florian ULiege; Engler, Robin; Collart, Flavien ULiege et al

in Nature Communications (2020), 11

The extent to which species can balance out the loss of suitable habitats due to climate warming by shifting their ranges is an area of controversy. Here, we assess whether highly efficient wind-dispersed ... [more ▼]

The extent to which species can balance out the loss of suitable habitats due to climate warming by shifting their ranges is an area of controversy. Here, we assess whether highly efficient wind-dispersed organisms like bryophytes can keep-up with projected shifts in their areas of suitable climate. Using a hybrid statistical-mechanistic approach accounting for spatial and temporal variations in both climatic and wind conditions, we simulate future migrations across Europe for 40 bryophyte species until 2050. The median ratios between predicted range loss vs expansion by 2050 across species and climate change scenarios range from 1.6 to 3.3 when only shifts in climatic suitability were considered, but increase to 34.7–96.8 when species dispersal abilities are added to our models. This highlights the importance of accounting for dispersal restrictions when projecting future distribution ranges and suggests that even highly dispersive organisms like bryophytes are not equipped to fully track the rates of ongoing climate change in the course of the next decades. [less ▲]

Detailed reference viewed: 61 (16 ULiège)
Full Text
Peer Reviewed
See detailThe bryophyte flora of an Alpine limestone area (Queyras, Hautes Alpes, France)
Sotiaux, A.; Dopagne, Claude ULiege; Vanderpoorten, Alain ULiege

in Journal of Bryology (2020), 42

Detailed reference viewed: 24 (1 ULiège)
Full Text
Peer Reviewed
See detailMaintenance of genetic and morphological identity in two sibling Syrrhopodon species (Calymperaceae, Bryopsida) despite extensive introgression.
Pereira, M.R.; Ledent, Alice ULiege; Mardulyn, P. et al

in Journal of Systematics and Evolution (2019), 57(4), 395-403

Bryophytes are a group of land plants in which the role of hybridization has long been challenged. Using genotyping by sequencing to circumvent the lack of molecular variation at selected loci previously ... [more ▼]

Bryophytes are a group of land plants in which the role of hybridization has long been challenged. Using genotyping by sequencing to circumvent the lack of molecular variation at selected loci previously used for phylogeny and morphology, we determine the level of genetic and morphological divergence and reproductive isolation between the sibling Syrrhopodon annotinus and S. simmondsii (Calymperaceae, Bryopsida) that occur in sympatry but in different habitats in lowland Amazonian rainforests. A clear morphological differentiation and a low (0.06), but significant Fst derived from the analysis of 183 single nucleotide polymorphisms were observed between the two species. Conspecific pairs of individuals consistently exhibited higher average kinship coefficients along a gradient of geographic isolation than interspecific pairs. The weak, but significant genetic divergence observed is consistent with growing evidence that ecological specialization can lead to genetic differentiation among bryophyte species. Nevertheless, the spatial genetic structures of the two species were significantly correlated, as evidenced by the significant slope of the Mantel test based on kinship coefficients between pairs of interspecific individuals and the geographic distance separating them. Interspecific pairs of individuals are thus more closely related when they are geographically closer, suggesting that isolation‐by‐distance is stronger than the interspecific reproductive barrier and pointing to interspecific gene flow. We conclude that interspecific introgression, whose role has long been questioned in bryophytes, may take place even in species wherein sporophyte production is scarce due to dioicy, raising the question as to what mechanisms maintain differentiation despite weak reproductive isolation. [less ▲]

Detailed reference viewed: 41 (9 ULiège)
Full Text
Peer Reviewed
See detailNo borders during the post-glacial assembly of European bryophytes
Ledent, Alice ULiege; Désamoré, Aurélie; Laenen, Benjamin et al

in Ecology Letters (2019), 22(6), 973-986

Climatic fluctuations during the Last Glacial Maximum (LGM) exerted a profound influence on biodiversity patterns, but their impact on bryophytes, the second most diverse group of land plants, has been ... [more ▼]

Climatic fluctuations during the Last Glacial Maximum (LGM) exerted a profound influence on biodiversity patterns, but their impact on bryophytes, the second most diverse group of land plants, has been poorly documented. Approximate Bayesian computations based on coalescent simulations showed that the post-glacial assembly of European bryophytes involves a complex his- tory from multiple sources. The contribution of allochthonous migrants was 95–100% of expand- ing populations in about half of the 15 investigated species, which is consistent with the globally balanced genetic diversities and extremely low divergence observed among biogeographical regions. Such a substantial contribution of allochthonous migrants in the post-glacial assembly of Europe is unparalleled in other plants and animals. The limited role of northern micro-refugia, 2 which was unexpected based on bryophyte life-history traits, and of southern refugia, is consistent with recent palaeontological evidence that LGM climates in Eurasia were much colder and drier than what palaeoclimatic models predict. [less ▲]

Detailed reference viewed: 67 (25 ULiège)
Full Text
Peer Reviewed
See detailA pilot workshop on Bryophytes at the Antananarivo Herbarium (TAN) revealed the presence of seven additional species for Madagascar
Reeb, C; Letsara, R; Andriamiarisoa, RL et al

in Candollea (2019)

Detailed reference viewed: 29 (2 ULiège)
Full Text
Peer Reviewed
See detailDo mosses really exhibit so large distribution ranges? Insights from the integrative taxonomic study of the Lewinskya affinis complex (Orthotrichaceae, Bryopsida)
Vigalondo, B.; Garilleti, R.; Vanderpoorten, Alain ULiege et al

in Molecular Phylogenetics and Evolution (2019), 140

The strikingly lower number of bryophyte species, and in particular of endemic species, and their larger distribution ranges in comparison with angiosperms, have traditionally been interpreted in terms of ... [more ▼]

The strikingly lower number of bryophyte species, and in particular of endemic species, and their larger distribution ranges in comparison with angiosperms, have traditionally been interpreted in terms of their low diversification rates associated with a high long-distance dispersal capacity. This hypothesis is tested here with Lewinskya affinis (≡ Orthotrichum affine), a moss species widely spread across Europe, North and East Africa, southwestern Asia, and western North America. We tested competing taxonomic hypotheses derived from separate and combined analyses of multilocus sequence data, morphological characters, and geographical distributions. The best hypothesis, selected by a Bayes factor molecular delimitation analysis, established that L. affinis is a complex of no less than seven distinct species, including L. affinis s.str., L. fastigiata and L. leptocarpa, which were previously reduced into synonymy with L. affinis, and four new species. Discriminant analyses indicated that each of the seven species within L. affinis s.l. can be morphologically identified with a minimal error rate. None of these species exhibit a trans-oceanic range, suggesting that the broad distributions typically exhibited by moss species largely result from a taxonomic artefact. The presence of three sibling western North American species on the one hand, and four Old World sibling species on the other, suggests that there is a tendency for within-continent diversification rather than recurrent dispersal following speciation. The faster rate of diversification as compared to intercontinental migration reported here is in sharp contrast with earlier views of bryophyte species with wide ranges and low speciation rates. © 2019 Elsevier Inc. [less ▲]

Detailed reference viewed: 35 (2 ULiège)
Full Text
Peer Reviewed
See detailPtychomitrium subcrispatum Thér. & P.de la Varde, an east southern African species excluded from the Cape Verde bryoflora
Sim-Sim, M.; Martins, A.; Rodrigues, A. S. B. et al

in Journal of Bryology (2019), 41

[No abstract available]

Detailed reference viewed: 22 (0 ULiège)
Full Text
Peer Reviewed
See detailTo what extent are bryophytes efficient dispersers?
Vanderpoorten, Alain ULiege; Patino, J.; Désamoré, A. et al

in Journal of Ecology (2019)

Detailed reference viewed: 48 (3 ULiège)
Full Text
Peer Reviewed
See detailResolution of the ordinal phylogeny of mosses using targeted exons from organellar and nuclear genomes
Liu, Y.; Johnson, M. G.; Cox, C. J. et al

in Nature Communications (2019), 10(1),

Mosses are a highly diverse lineage of land plants, whose diversification, spanning at least 400 million years, remains phylogenetically ambiguous due to the lack of fossils, massive early extinctions ... [more ▼]

Mosses are a highly diverse lineage of land plants, whose diversification, spanning at least 400 million years, remains phylogenetically ambiguous due to the lack of fossils, massive early extinctions, late radiations, limited morphological variation, and conflicting signal among previously used markers. Here, we present phylogenetic reconstructions based on complete organellar exomes and a comparable set of nuclear genes for this major lineage of land plants. Our analysis of 142 species representing 29 of the 30 moss orders reveals that relative average rates of non-synonymous substitutions in nuclear versus plastid genes are much higher in mosses than in seed plants, consistent with the emerging concept of evolutionary dynamism in mosses. Our results highlight the evolutionary significance of taxa with reduced morphologies, shed light on the relative tempo and mechanisms underlying major cladogenic events, and suggest hypotheses for the relationships and delineation of moss orders. © 2019, The Author(s). [less ▲]

Detailed reference viewed: 48 (2 ULiège)
Full Text
Peer Reviewed
See detailBryophytes of Kédougou (Eastern Senegal), with a key to the Fissidens of Senegal
Diop, D; Diop, D; Bruggeman-Nannenga, MA et al

in Journal of Bryology (2018), 40

Detailed reference viewed: 24 (2 ULiège)
Full Text
Peer Reviewed
See detailBryophytes of Jaú National Park (Amazonas, Brazil): Estimating species detectability and richness in a lowland Amazonian megareserve
Sierra, A. M.; Vanderpoorten, Alain ULiege; Gradstein, S. R. et al

in Bryologist (2018), 121(4), 571-588

In the past decade, floristic studies have rebounded as checklists are fundamental for executing meta-analyses which address ecological, biogeographic and evolutionary questions of broad geographic scope ... [more ▼]

In the past decade, floristic studies have rebounded as checklists are fundamental for executing meta-analyses which address ecological, biogeographic and evolutionary questions of broad geographic scope. Despite the importance of checklists as baseline records of local diversity and distributions, few attempts have been made to quantify sampling effort and species detectability within and among study sites. Quantitative floristics, which combines the use of checklists with statistical methods for estimating local richness, is a promising method for characterizing the completeness of checklists especially for cryptic components of biodiversity. For bryophytes, quantifying levels of detectability among substrate types is of central importance, especially in tropical forests where much of their diversity is harbored in difficult to access habitats such as the tree canopy. In light of the need to establish quantifiable protocols of detectability in poorly studied tropical regions, we present a bryophyte checklist for the Jaú National Park (JNP), located in the heart of the Amazon, and estimate local species richness and detectability as it relates to five substrate types (epiphytes, epiphylls, epixylic, epipetric and soil). Identifications from 712 collections made during four excursions over the past decade to JNP revealed 150 species consisting of two new country records and five new state records, along with 20 rarely collected Amazonian endemics. Despite our intensive sampling, which included systematic canopy collections during one of the excursions, Chao richness index estimated that ca. 46 species (nearly one-third of those presently observed) remain undetected from JNP. Furthermore, levels of detectability among substrates varied widely, where observed epiphyte richness, in contrast to the other substrates types, most closely approximated the estimates. Our results illustrate the need for quantitative richness estimates as a means to increase the accuracy of checklist data, particularly when used in meta-analyses addressing global-scale questions. Copyright. © 2018 by The American Bryological and Lichenological Society, Inc. [less ▲]

Detailed reference viewed: 32 (0 ULiège)
Full Text
Peer Reviewed
See detailBryophyte biogeography
Patino, J; Vanderpoorten, Alain ULiege

in Critical Reviews in Plant Sciences (2018)

Detailed reference viewed: 88 (6 ULiège)
Full Text
Peer Reviewed
See detailHerbarium-based science in the twenty-first century
Besnard, G.; Gaudeul, M.; Lavergne, S. et al

in Botany Letters (2018), 165

Detailed reference viewed: 44 (10 ULiège)
Full Text
Peer Reviewed
See detailIsothecium myosuroides var. brachythecioides (Dixon) Braithw. reinstated as a species, I. interludens Stirt.
Hodgetts, Nick; Vanderpoorten, Alain ULiege

in Journal of Bryology (2018), 40

Detailed reference viewed: 22 (2 ULiège)