Phylogeny strongly drives seed dormancy and quality in a climatically buffered hotspot for plant endemism

Annals of Botany, Год журнала: 2016, Номер 119(2), С. 267 - 277

Опубликована: Авг. 27, 2016

Background and Aims Models of costs benefits dormancy (D) predict that the evolutionarily stable strategy in long-term environments is for non-dormancy (ND), but this prediction remains to be tested empirically. We reviewed seed traits species climatically buffered, geologically nutrient-impoverished campo rupestre grasslands Brazil test hypothesis ND favoured over D. examined relative importance life-history phylogeny driving evolution D assessed viability at community level. Methods Germination data were retrieved from 67 publications ND/D was determined 168 25 angiosperm families. also obtained percentage embryoless, viable dormant seeds 74 species. Frequencies with non-dormant compared global databases distribution. Key Results The majority taxa (62·5 %) had seeds, ratio highest any vegetation type on Earth. Dormancy unrelated other traits, suggesting contemporary factors are poor predictors found a significant phylogenetic structure categorical trait. diversity highly skewed towards root tree there strong signal data, major role determining versus viability. Quantitative analysis revealed least half produced by 46 % surveyed populations embryoless and/or otherwise non-viable. Conclusions Our results support view climatic geological stability favour ND. Seed show have markedly low investment regeneration highlighting need specific situ ex conservation strategies avoid loss biodiversity.

Язык: Английский

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Worldwide destruction of inselbergs and related rock outcrops threatens a unique ecosystem

Biodiversity and Conservation, Год журнала: 2016, Номер 25(13), С. 2827 - 2830

Опубликована: Сен. 13, 2016

Язык: Английский

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Do plant populations on distinct inselbergs talk to each other? A case study of genetic connectivity of a bromeliad species in an Ocbil landscape

Ecology and Evolution, Год журнала: 2017, Номер 7(13), С. 4704 - 4716

Опубликована: Май 23, 2017

Abstract Here, we explore the historical and contemporaneous patterns of connectivity among Encholirium horridum populations located on granitic inselbergs in an Ocbil landscape within Brazilian Atlantic Forest, using both nuclear chloroplast microsatellite markers. Beyond to assess E. population genetic structure, built species distribution models across four periods (current conditions, mid‐Holocene, Last Glacial Maximum [LGM], Interglacial) inferred putative dispersal corridors a least‐cost path analysis elucidate biogeographic patterns. Overall, high significant divergence was estimated for plastid DNA (Φ ST ( n ) = 0.463 Φ (plastid) 0.961, respectively, p < .001). For genome, almost total absence admixture very low migration rates were evident, corroborating with estimates immigration emigration observed populations. Based cp results, routes Sugar Loaf Land cycles climatic fluctuations Quaternary period revealed that populations’ changed little during those events. Genetic analyses highlighted long‐term persistence populations, founder effect drift seemed have been important processes shaped current diversity structure genomes. The singularity each clearly shows need situ conservation all them.

Язык: Английский

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A new phytogeographic map for the Southwest Australian Floristic Region after an exceptional decade of collection and discovery

Botanical Journal of the Linnean Society, Год журнала: 2017, Номер 184(1), С. 1 - 15

Опубликована: Фев. 15, 2017

After an 11-year period of exceptional specimen acquisition, we evaluated the robustness Western Australian Herbarium Specimen Database in elucidating patterns diversity and phytogeographic maps Southwest Floristic Region (SWAFR). Using rarefaction strategies to compensate for sample bias a novel approach multivariate classification site ordination, generated floristic provinces districts SWAFR. A 33% increase numbers 10% additional taxa were recorded study area (SWAFR 75km inland buffer) over 11 years, although historical biases collecting tended persist. Although district concepts robust, regional provincial more equivocal. We therefore opted broad delineations rather than geographically precise ones. propose map, adding new province (Kalbarri), five other boundary adjustments The updated SWAFR has 8379 native vascular plant (82% species 18% subspecies), which 47% are endemic 49% have been described since 1970. Biodiversity indices from collections data should be used cautiously. In contrast, regionalization is robust at level. Despite shortcomings, herbarium provide best information available broadscale analyses diversity.

Язык: Английский

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Plant life in campo rupestre : New lessons from an ancient biodiversity hotspot

Flora, Год журнала: 2017, Номер 238, С. 1 - 10

Опубликована: Дек. 6, 2017

Язык: Английский

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Soil types select for plants with matching nutrient‐acquisition and ‐use traits in hyperdiverse and severely nutrient‐impoverished campos rupestres and cerrado in Central Brazil

Journal of Ecology, Год журнала: 2018, Номер 107(3), С. 1302 - 1316

Опубликована: Ноя. 25, 2018

Abstract Understanding the mechanisms that underlie generation of beta‐diversity remains a challenge in ecology. Underground plant adaptations to environmental gradients have received relatively little attention. We studied nutrient‐acquisition strategies and nutrient‐use efficiency at three stages pedogenesis infertile soils from campos rupestres on less soil cerrado sensu stricto Brazil. All support very high diversity with species turnover between types small spatial scales (metres). expected differences ‐use would be associated this turnover. With severely decreasing phosphorus (P) availability, we effectiveness arbuscular mycorrhizal (AM) symbioses for P acquisition decrease, reliance nonmycorrhizal (NM) increase, while maintaining efficient nutrient use. Concentrations total nitrogen (N) were greater than those , more weathered N impoverished. The proportion root length colonized by AM fungi was 71% <1% most P‐impoverished type . Conversely, P‐acquisition such as rhizosheaths soils. Leaf [P] [N] low decreased [N]. N:P ratios suggest limitation productivity but N‐P colimitation Photosynthetic rates increasing impoverishment, photosynthetic P‐use N‐use moderately all Most had P‐remobilization during leaf senescence (>70%), only moderate N‐remobilization (~50%). Synthesis observed species, consistent being strongly limited N. Our findings demonstrate different characteristics (nutrient availability texture) select differing (especially below‐ground traits) which is likely key scale (i.e., beta‐diversity)

Язык: Английский

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OCBIL theory examined: reassessing evolution, ecology and conservation in the world’s ancient, climatically buffered and infertile landscapes

Biological Journal of the Linnean Society, Год журнала: 2020, Номер 133(2), С. 266 - 296

Опубликована: Дек. 3, 2020

Abstract OCBIL theory was introduced as a contribution towards understanding the evolution, ecology and conservation of biological cultural diversity old, climatically buffered, infertile landscapes (OCBILs), especially in Southern Hemisphere. The addresses some most intransigent environmental trends our time – ongoing decline biodiversity First Nations. Here we reflect on OCBILs, origins theory, its principal hypotheses biological, anthropological applications. discovery that threatened plant species are concentrated Southwest Australian Floristic Region (SWAFR) infertile, phosphorous-impoverished uplands within 500 km coast formed foundational framework for led to development testable growing literature is addressing. Currently, OCBILs recognized 15 Global Biodiversity Hotspots eight other regions. SWAFR, Greater Cape South Africa America’s campos rupestres (montane grasslands) those regions have comprehensively been investigated context theory. We summarize 12 evolutionary, ecological ten conservation-management being recent contributions literature.

Язык: Английский

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Global analysis of Poales diversification – parallel evolution in space and time into open and closed habitats

New Phytologist, Год журнала: 2023, Номер 242(2), С. 727 - 743

Опубликована: Ноя. 27, 2023

Poales are one of the most species-rich, ecologically and economically important orders plants often characterise open habitats, enabled by unique suites traits. We test six hypotheses regarding evolution assembly in closed habitats throughout world, examine whether diversification patterns demonstrate parallel evolution. sampled 42% species obtained taxonomic biogeographic data from World Checklist Vascular Plants database, which was combined with open/closed habitat scored experts. A dated supertree constructed. integrated spatial phylogenetics regionalisation analyses, historical biogeography ancestral state estimations. Diversification result dynamic evolutionary processes that vary across lineages, time space, prominently tropical southern latitudes. Our results reveal recurrent trait transitions species-rich families Poaceae Cyperaceae. Smaller display divergent trajectories. The have achieved global dominance via notable, spatially phylogenetically restricted divergences into strictly habitats.

Язык: Английский

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Plant biogeography of rock outcrops in South American tropical lowlands

Frontiers of Biogeography, Год журнала: 2025, Номер 18

Опубликована: Март 10, 2025

Studies of rock outcrops in tropical South America have increased recent years, but they often been restricted to individual countries, single biomes or disciplines (e.g. through a floristic, functional genetic lens), limiting their generality. We review the current state knowledge on geological and floristic diversity identify gaps generate testable hypotheses for future research into biogeography evolution plant communities. find that lowland outcrop vegetation is disparately documented we know less about evolutionary biogeographic history these island-like systems. Based edaphic factors, classify American four main groups: granite/gneiss, quartzite/metamorphosed sandstone, limestone ironstone. hypothesise lithologies influence lineage composition floras. However, elevation also plays role creating microclimatic conditions by influencing degree insularity from surrounding vegetation. Our literature suggests support different floras, confirming this requires further surveys across full outcrops. suggest framework to: (i) improve floras how relate biomes; (ii) investigate relative roles niche conservatism using phylogenetic approaches; (iii) assess species cope with living naturally fragmented habitats analysis recruitment gene flow population genetics. Understanding can help provide information conservation planning decisions. Rock are urgent need study because possess distinctive highly specialised flora threatened climate land-use changes. There increase number studies some Latin countries Bolivia, Paraguay, Guyana, French Guiana Suriname) limestone). major determinant lithology outline be tested community-level data. Inferring relationships endemic establishing environments where closest relatives occur will powerful approach address questions historical assembly Population approaches focusing both elucidate connectivity and, therefore, insular vulnerable are.

Язык: Английский

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Young calcareous soil chronosequences as a model for ecological restoration on alkaline mine tailings

The Science of The Total Environment, Год журнала: 2017, Номер 607-608, С. 168 - 175

Опубликована: Июль 27, 2017

Язык: Английский

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