A5051547050- Fern and Epiphyte Biology
- Plant and animal studies
- Mediterranean and Iberian flora and fauna
- Ecology and Vegetation Dynamics Studies
- Botany and Plant Ecology Studies
- Mycorrhizal Fungi and Plant Interactions
- Plant Pathogens and Fungal Diseases
- Plant Taxonomy and Phylogenetics
- Plant Parasitism and Resistance
- Lichen and fungal ecology
- Plant Diversity and Evolution
- Amphibian and Reptile Biology
- Animal and Plant Science Education
- Botany, Ecology, and Taxonomy Studies
- Bryophyte Studies and Records
- Land Use and Ecosystem Services
- Wildlife-Road Interactions and Conservation
- Pesticide and Herbicide Environmental Studies
- Species Distribution and Climate Change
- Peatlands and Wetlands Ecology
- Biomedical Research and Pathophysiology
- Geology and Paleoclimatology Research
- Archaeological and Historical Studies
- Plant Pathogens and Resistance
- Plant Reproductive Biology
Universidad Rey Juan Carlos
2014-2024
Instituto de Investigación en Cambio Global
2024
Complejo Hospitalario Universitario de Santiago
2022
Universidad Complutense de Madrid
2000-2006
Universidade de Santiago de Compostela
2000-2004
Austral University of Chile
2004
Abstract Aim To disentangle the influence of environmental factors at different spatial grains (regional and local) on fern lycophyte species richness to ask how regional plot‐level are related each other. Location Global. Taxon Ferns lycophytes. Methods We explored two grains, (hexagonal grid cells 7,666 km 2 ) plot level (300–500 m ), in relation data local (the hexagonal 4 square cells, respectively). For grain, we obtained for 1,243 units used them together with climatic topographical...
Spore germination of five globally threatened fern species [Culcita macrocarpa C. Presl, Dryopteris aemula (Aiton) O. Kuntze, D. corleyi Fraser‐Jenkins, guanchica Gibby and Jermy Woodwardia radicans (L.) Sm.] was determined after 1, 6 or 12 months storage in glass vials (dry storage) on agar (wet at –20, 5 20 °C. In all species, technique, temperature the technique–temperature interaction had a significant effect percentage. most cases, percentage best maintained by wet case hygrophilous W....
1 In environmental sex determination (ESD) gender is decided after conception, depending on the environment, rather than being genetically fixed. ESD in plants has been mainly studied angiosperms, where dominant form of sexual lability. Surprisingly, rarely homosporous ferns, only which rule, exception. 2 Here, we address mechanism underlying for fern Woodwardia radicans by experimentally manipulating nutrient availability and gametophyte density. 3 Stress (limited supply, crowding) affected...
A previous study detected no allozyme diversity in Iberian populations of the buckler-fern Dryopteris aemula. The use a more sensitive marker, such as microsatellites, was thus needed to reveal genetic diversity, breeding system and spatial structure this species natural populations. Eight microsatellite loci for D. aemula were developed their cross-amplification with other ferns tested. Five polymorphic used characterize amount distribution three from Peninsula one population Azores. Most...
The gametophyte of the fern Dryopteris affinis ssp. represents a good model to explore molecular basis vegetative and reproductive development, as well stress responses. Specifically, this reproduces asexually by apogamy, peculiar case apomixis whereby sporophyte forms directly from gametophytic cell without fertilization. Using an RNA-sequencing approach, we have previously annotated more than six thousand transcripts. Here, selected one hundred inferred proteins that seemed particularly...
• Background and Aims Although allopolyploidy is a prevalent speciation mechanism in plants, its adaptive consequences are poorly understood. In addition, the effects of per se (i.e. hybridization chromosome doubling) can be confounded with those subsequent evolutionary divergence between allopolyploids related diploids. This report assesses whether fern species same ploidy level or altitudinal distribution have similar germination responses to temperature. The polyploidy on spore abortion...
The gametophytic generation of the allotetraploid Polystichum aculeatum and its diploid parents, setiferum lonchitis, was studied in order to compare their morphology, gametangial ontogeny, breeding system. Six populations, two each species, were selected for spore collection. Germination, gender expression, antheridiogen experiments established on agar soil culture media. Germination percentage tetraploid higher, only morphological difference found length marginal hairs that also longer P....
The variables affecting spore phenology have been poorly studied in contrast with the abundant literature on leaf phenology. This paper deals influence of altitude and canopy cover maturation release Culcita macrocarpa Woodwardia radicans island São Miguel, Azores. study was conducted during one sporing season at three altitudes (400, 600, 800 m). In both species occurred autumn may be controlled by previous accumulation photosynthates. Spores were not released until late winter owing to a...
Abstract: Spore germination of Culcita macrocarpa C. Presl and Woodwardia radicans (L.) Sm. from nine populations at the northern limit their distribution, in northwest Iberian Peninsula, was investigated. In a first experiment, population type temperature (10, 15, 20, 25 °C) were both found to affect percentage time significantly species. There also significant interactions between two factors with respect W. radicans. there an outstanding increase 15 °C and, above all, 10 °C, whereas most...
For many plants, sex is not fixed by genotype but determined environmental conditions during development. In homosporous pteridophytes, environmentally the presence or absence of antheridiogens, maleness-inducing pheromones. It has been proposed that antheridiogens primarily reduce growth rate, with small gametophyte size responsible for maleness. To test this hypothesis, effects antheridiogen and intergametophytic competition on gender expression were studied in a culture experiment...
Studies on genetic diversity help us to unveil the evolutionary processes of species and populations can explain several traits diploid-polyploid complexes such as their distributions, breeding systems, origin polyploids. We examined allozyme variation Dryopteris aemula D. oreades, diploid ferns with highly fragmented habitats, allotetraploid corleyi (1) analyze putative relationship between both diploids tetraploid, (2) compare levels among determine causes, (3) assess system these taxa....
Environmental sex determination (ESD) is present in several animal and plant lineages. Diverse factors such as temperature, light or water availability have been described determinants these organisms. Among plants, ferns frequently display ESD. This work compares the effect of different levels two diploid species xerophytic fern genus Cheilanthes their derived tetraploid, if they are sensitive to antheridiogen (i.e. maleness-inducing pheromone). Different watering regimes were applied...
Background and AimsSeveral models predict that the establishment of polyploids within diploid populations is enhanced by non-random mating (i.e. selfing assortative mating) cytotypes a higher relative fitness polyploids. This report assesses role antheridiogens maleness-inducing pheromones) intercytotype differences in growth rate have on polyploid performance.
Premise When two populations of related cytotypes grow in sympatry, the rarer cytotype tends to be excluded due a frequency‐dependent mating disadvantage. Evolutionary models predict that polyploids, which are typically upon first formation, should have higher relative fitness and/or selfing rates establish and then coexist with diploid parents. Methods Performance during early recruitment was compared among three co‐occurring rupicolous fern species: allotetraploid Cheilanthes tinaei its...
Abstract The thelypteroid fern genus Stegnogramma s.l. contains around 18–35 species and has a global, cross‐continental distribution ranging from tropical to temperate regions. Several genera infrageneric sections have been recognized previously in s.l., but their phylogenetic relationships are still unclear. In this study, we present global phylogeny of with the most comprehensive sampling date aim pinpoint positions biogeographically taxonomically important taxa. Based on reconstructed...
Abstract Habitat loss and fragmentation are the primary causes of global population decline amphibians reptiles. In Brazil, that hosts an extraordinary herpetofaunal richness, reptiles clearly undersampled among vertebrate groups in research. This bias may underestimate effects on herpetofauna this megadiverse country. Here, we conducted exhaustive literature review to evaluate patterns Brazil. We analyzed 55 papers between 1994 2020, comprising 350 cases effect (positive, negative, or...
The gametophyte of ferns reproduces either by sexual or asexual means. In the latter, apogamy represents a peculiar case apomixis, in which an embryo is formed from somatic cells. A proteomic and physiological approach was applied to apogamous fern Dryopteris affinis ssp. its relative D. oreades. analysis compared vs. female gametophytes, whereas phytohormone study included, addition females, three stages (filamentous, spatulate, cordate). profiles revealed total 879 proteins and, after...