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Bacterial diversity in rhizosphere soil from Antarctic vascular plants of Admiralty Bay, maritime Antarctica

TEIXEIRA, Lia C. R. S.; PEIXOTO, Raquel S.; CURY, Juliano C.; SUL, Woo Jun; PELLIZARI, Vivian H.; TIEDJE, James; ROSADO, Alexandre S.
Fonte: NATURE PUBLISHING GROUP Publicador: NATURE PUBLISHING GROUP
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
46.11%
The Antarctic is a pristine environment that contributes to the maintenance of the global climate equilibrium. The harsh conditions of this habitat are fundamental to selecting those organisms able to survive in such an extreme habitat and able to support the relatively simple ecosystems. The DNA of the microbial community associated with the rhizospheres of Deschampsia antarctica Desv (Poaceae) and Colobanthus quitensis (Kunth) BartI (Caryophyllaceae), the only two native vascular plants that are found in Antarctic ecosystems, was evaluated using a 16S rRNA multiplex 454 pyrosequencing approach. This analysis revealed similar patterns of bacterial diversity between the two plant species from different locations, arguing against the hypothesis that there would be differences between the rhizosphere communities of different plants. Furthermore, the phylum distribution presented a peculiar pattern, with a bacterial community structure different from those reported of many other soils. Firmicutes was the most abundant phylum in almost all the analyzed samples, and there were high levels of anaerobic representatives. Also, some phyla that are dominant in most temperate and tropical soils, such as Acidobacteria, were rarely found in the analyzed samples. Analyzing all the sample libraries together...

Flora vascular da Mata da Pavuna, Botucatu, SP, Brasil

Biral, Leonardo; Lombardi, Julio Antonio
Fonte: Instituto de Pesquisas Jardim Botânico do Rio de Janeiro Publicador: Instituto de Pesquisas Jardim Botânico do Rio de Janeiro
Tipo: Artigo de Revista Científica Formato: 441-450
POR
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56%
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); A Mata da Pavuna é um fragmento de Floresta Estacional Semidecidual em um cânion com afloramento rochoso e solo raso, localizado no município de Botucatu, Estado de São Paulo. Foram amostradas as espécies vasculares em estádio reprodutivo e identificadas até o menor nível taxonômico possível. Foram encontradas 386 espécies em 84 famílias. Fabaceae foi a família com maior número de espécies (44), seguida de Asteraceae (34), Euphorbiaceae (18), Poaceae (17), Malvaceae (14), Bignoniaceae e Solanaceae (12). Entre as Pteridophyta sensu lato, as famílias mais diversas foram Pteridaceae (nove espécies) e Polypodiaceae (sete). Comparado a outros levantamentos florísticos extensos na Mata Atlântica, os resultados ressaltam a elevada diversidade florística local, bem como a presença de espécies típicas de formações xerofíticas sugerindo a ocorrência de um encrave de vegetação seca nesta região. Destacamos também o primeiro registro de Pellaea ovata (Desv.) Weath. (Pteridaceae) para o Brasil.; Mata da Pavuna is a fragment of Seasonal Semideciduous Forest located in a canyon characterized by rocky outcrops and shallow soil, in Botucatu municipality...

Florística vascular da Mata da Pavuna, Botucatu, SP, Brasil

Santos, Leonardo Biral
Fonte: Universidade Estadual Paulista (UNESP) Publicador: Universidade Estadual Paulista (UNESP)
Tipo: Dissertação de Mestrado Formato: 57 f. : il., tabs.
POR
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56%
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Pós-graduação em Ciências Biológicas (Biologia Vegetal) - IBRC; A Mata da Pavuna é um fragmento de floresta estacional semidecídua em um cânion com afloramento rochoso e solo raso, localizado no município de Botucatu, Estado de São Paulo. Foram amostradas todas as espécies vasculares em estádio reprodutivo e identificadas até o menor nível possível. Foram encontradas 381 espécies em 83 famílias. Fabaceae foi a família com maior número de espécies (44), seguido de Asteraceae (33), Euphorbiaceae (18), Poaceae (17), Malvaceae (14), Bignoniaceae e Solanaceae (12). Em Pteridophyta sensu stricto as famílias mais diversas foram Pteridaceae (oito espécies) e Polypodiaceae (sete). Comparado a outros levantamentos florísticos extensos na Mata Atlântica os resultados ressaltam a elevada diversidade florística local, bem como a presença de espécies típicas de formações xerofíticas sugerindo, inclusive, a ocorrência de um encrave de vegetação seca. Noticiamos também o primeiro registro de Pellaea ovata (Desv.) Weath. (Pteridaceae) para o Brasil; The „Mata da Pavuna‟ is a semideciduous seasonal forest fragment located in a canyon characterized by rock outcrops and shallow soil...

Estatuto de conservação das plantas vasculares endémicas dos Açores segundo os critérios da IUCN : implicações ao nível do ordenamento do território e do planeamento ambiental

Corvelo, Rodolfo Artur Ferreira
Fonte: Universidade dos Açores Publicador: Universidade dos Açores
Tipo: Dissertação de Mestrado
Publicado em 23/02/2010 POR
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46.23%
Dissertação de Mestrado em Ordenamento do Território e Planeamento Ambiental; Apenas 7 plantas vasculares, entre as 72 referidas como endémicas para os Açores, foram alvo de avaliação segundo os critérios mais recentes estabelecidos pela IUCN. Mesmo para essas plantas, os dados em que se baseou a avaliação parecem algo desactualizados e restritos. Com o desenvolvimento dos projectos ATLÂNTICO e BIONATURA, existe hoje uma grande quantidade de informação disponível sobre a distribuição e a abundância das plantas vasculares endémicas dos Açores. Para além disso, muitas das plantas foram avaliadas no sentido de determinar qual a sua prioridade em termos de conservação durante o projecto BIONATURA, cujos resultados já foram publicados. Embora a classificação atribuída pela IUCN não seja o único sistema a considerar quando se definem prioridades em conservação, continua a ser utilizado a nível global para determinar o grau de ameaça a que as espécies se encontram sujeitas. Assim, estão reunidas as condições para que se proceda a uma análise global da situação de referência relativa às plantas vasculares endémicas dos Açores. Mesmo para as espécies cuja abundância e as ameaças são menos conhecidas...

Community structure of vascular plants in treefall gaps and fire-disturbed habitats in the Atlantic rainforest, southern Bahia, Brazil

Martini,Adriana Maria Zanforlin; Santos,Flavio Antonio Maës dos; Prado,Paulo Inácio; Jardim,Jomar Gomes
Fonte: Sociedade Botânica de São Paulo Publicador: Sociedade Botânica de São Paulo
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2007 EN
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46.18%
The effects of disturbances on plant community structure in tropical forests have been widely investigated. However, a majority of these studies examined only woody species, principally trees, whereas the effects of disturbances on the whole assemblage of vascular plants remain largely unexplored. At the present study, all vascular plants < 5m tall were surveyed in four habitats: natural treefall gaps, burned forest, and their adjacent understorey. The burned area differed from the other habitats in terms of species composition. However, species richness and plant density did not differ between burned area and the adjacent understorey, which is in accordance to the succession model that predict a rapid recovery of species richness, but with a different species composition in areas under moderate disturbance. The treefall gaps and the two areas of understorey did not differ among themselves in terms of the number of individuals, number of species, nor in species composition. The absence of differences between the vegetation in treefall gaps and in understorey areas seems to be in agreement with the current idea that the species present in treefall gaps are directly related to the vegetation composition before gap formation. Only minimal differences were observed between the analyses that considered only tree species and those that considered all growth habits. This suggests that the same processes acting on tree species (the best studied group of plants in tropical forests) are also acting on the whole assemblage of vascular plants in these communities.

Chloroplast DNA Sequence Homologies among Vascular Plants 1

Lamppa, Gayle K.; Bendich, Arnold J.
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /04/1979 EN
Relevância na Pesquisa
46.14%
The extent of sequence conservation in the chloroplast genome of higher plants has been investigated. Supercoiled chloroplast DNA, prepared from pea seedlings, was labeled in vitro and used as a probe in reassociation experiments with a high concentration of total DNAs extracted from several angiosperms, gymnosperms, and lower vascular plants. In each case the probe reassociation was accelerated, demonstrating that some chloroplast sequences have been highly conserved throughout the evolution of vascular plants. Only among the flowering plants were distinct levels of cross-reaction with the pea chloroplast probe evident; broad bean and barley exhibited the highest and lowest levels, respectively. With the hydroxylapatite assay these levels decreased with a decrease in probe fragment length (from 1,860 to 735 bases), indicating that many conserved sequences in the chloroplast genome are separated by divergent sequences on a rather fine scale. Despite differences observed in levels of homology with the hydroxylapatite assay, S1 nuclease analysis of heteroduplexes showed that outside of the pea family the extent of sequence relatedness between the probe and various heterologous DNAs is approximately the same: 30%. In our interpretation...

The relationships of vascular plants.

Kenrick, P
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em 29/06/2000 EN
Relevância na Pesquisa
46.23%
Recent phylogenetic research indicates that vascular plants evolved from bryophyte-like ancestors and that this involved extensive modifications to the life cycle. These conclusions are supported by a range of systematic data, including gene sequences, as well as evidence from comparative morphology and the fossil record. Within vascular plants, there is compelling evidence for two major clades, which have been termed lycophytes (clubmosses) and euphyllophytes (seed plants, ferns, horsetails). The implications of recent phylogenetic work are discussed with reference to life cycle evolution and the interpretation of stratigraphic inconsistencies in the early fossil record of land plants. Life cycles are shown to have passed through an isomorphic phase in the early stages of vascular plant evolution. Thus, the gametophyte generation of all living vascular plants is the product of massive morphological reduction. Phylogenetic research corroborates earlier suggestions of a major representational bias in the early fossil record. Mega-fossils document a sequence of appearance of groups that is at odds with that predicted by cladogram topology. It is argued here that the pattern of appearance and diversification of plant megafossils owes more to changing geological conditions than to rapid biological diversification.

Shifts in bryophyte carbon isotope ratio across an elevation × soil age matrix on Mauna Loa, Hawaii: do bryophytes behave like vascular plants?

Waite, Mashuri; Sack, Lawren
Fonte: Springer-Verlag Publicador: Springer-Verlag
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
46.27%
The carbon isotope ratio (δ13C) of vascular plant leaf tissue is determined by isotope discrimination, primarily mediated by stomatal and mesophyll diffusion resistances and by photosynthetic rate. These effects lead to predictable trends in leaf δ13C across natural gradients of elevation, irradiance and nutrient supply. Less is known about shifts in δ13C for bryophytes at landscape scale, as bryophytes lack stomata in the dominant gametophyte phase, and thus lack active control over CO2 diffusion. Twelve bryophyte species were sampled across a matrix of elevation and soil ages on Mauna Loa, Hawaii Island. We tested hypotheses based on previous findings for vascular plants, which tend to have less negative δ13C at higher elevations or irradiances, and for leaves with higher leaf mass per area (LMA). Across the matrix, bryophytes spanned the range of δ13C values typical of C3 vascular plants. Bryophytes were remarkably similar to vascular plants in exhibiting less negative δ13C with increasing elevation, and with lower overstory cover; additionally δ13C was related to bryophyte canopy projected mass per area, a trait analogous to LMA in vascular plants, also correlated negatively with overstory cover. The similarity of responses of δ13C in bryophytes and vascular plants to environmental factors...

The Mitochondrial Genome of the Lycophyte Huperzia squarrosa: The Most Archaic Form in Vascular Plants

Liu, Yang; Wang, Bin; Cui, Peng; Li, Libo; Xue, Jia-Yu; Yu, Jun; Qiu, Yin-Long
Fonte: Public Library of Science Publicador: Public Library of Science
Tipo: Artigo de Revista Científica
Publicado em 12/04/2012 EN
Relevância na Pesquisa
46.28%
Mitochondrial genomes have maintained some bacterial features despite their residence within eukaryotic cells for approximately two billion years. One of these features is the frequent presence of polycistronic operons. In land plants, however, it has been shown that all sequenced vascular plant chondromes lack large polycistronic operons while bryophyte chondromes have many of them. In this study, we provide the completely sequenced mitochondrial genome of a lycophyte, from Huperzia squarrosa, which is a member of the sister group to all other vascular plants. The genome, at a size of 413,530 base pairs, contains 66 genes and 32 group II introns. In addition, it has 69 pseudogene fragments for 24 of the 40 protein- and rRNA-coding genes. It represents the most archaic form of mitochondrial genomes of all vascular plants. In particular, it has one large conserved gene cluster containing up to 10 ribosomal protein genes, which likely represents a polycistronic operon but has been disrupted and greatly reduced in the chondromes of other vascular plants. It also has the least rearranged gene order in comparison to the chondromes of other vascular plants. The genome is ancestral in vascular plants in several other aspects: the gene content resembling those of charophytes and most bryophytes...

Database of Vascular Plants of Canada (VASCAN): a community contributed taxonomic checklist of all vascular plants of Canada, Saint Pierre and Miquelon, and Greenland

Desmet, Peter; Brouillet, Luc
Fonte: Pensoft Publishers Publicador: Pensoft Publishers
Tipo: Artigo de Revista Científica
Publicado em 24/07/2013 EN
Relevância na Pesquisa
46.15%
The Database of Vascular Plants of Canada or VASCAN (http://data.canadensys.net/vascan) is a comprehensive and curated checklist of all vascular plants reported in Canada, Greenland (Denmark), and Saint Pierre and Miquelon (France). VASCAN was developed at the Université de Montréal Biodiversity Centre and is maintained by a group of editors and contributors. For every core taxon in the checklist (species, subspecies, or variety), VASCAN provides the accepted scientific name, the accepted French and English vernacular names, and their synonyms/alternatives in Canada, as well as the distribution status (native, introduced, ephemeral, excluded, extirpated, doubtful or absent) of the plant for each province or territory, and the habit (tree, shrub, herb and/or vine) of the plant in Canada. For reported hybrids (nothotaxa or hybrid formulas) VASCAN also provides the hybrid parents, except if the parents of the hybrid do not occur in Canada. All taxa are linked to a classification. VASCAN refers to a source for all name, classification and distribution information.

Patterns of species diversity and phylogenetic structure of vascular plants on the Qinghai-Tibetan Plateau

Yan, Yujing; Yang, Xian; Tang, Zhiyao
Fonte: Blackwell Publishing Ltd Publicador: Blackwell Publishing Ltd
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
46.24%
Large-scale patterns of species richness and the underlying mechanisms regulating these patterns have long been the central issues in biogeography and macroecology. Phylogenetic community structure is a result of combined effects of contemporary ecological interactions, environmental filtering, and evolutionary history, and it links community ecology with biogeography and trait evolution. The Qinghai-Tibetan Plateau provides a good opportunity to test the influence of contemporary climate on shaping species richness because of its unique geological history, cold climate, and high biodiversity. In this study, based on high-resolution distributions of ˜9000 vascular plant species, we explored how species richness and phylogenetic structure of vascular plants correlate with climates on the highest (and species rich) plateau on the Earth. The results showed that most of the vascular plants were distributed on the eastern part of the plateau; there was a strong association between species richness and climate, even after the effects of habitat heterogeneity were controlled. However, the responses of richness to climate remarkably depended on life-forms. Richness of woody plants showed stronger climatic associations than that of herbaceous plants; energy and water availability together regulated richness pattern of woody plants; whereas water availability predominantly regulated richness pattern of herbaceous plants. The phylogenetic structure of vascular species clustered in most areas of the plateau...

Evolutionary aspects of non-cell-autonomous regulation in vascular plants: structural background and models to study

Evkaikina, Anastasiia I.; Romanova, Marina A.; Voitsekhovskaja, Olga V.
Fonte: Frontiers Media S.A. Publicador: Frontiers Media S.A.
Tipo: Artigo de Revista Científica
Publicado em 11/02/2014 EN
Relevância na Pesquisa
46.14%
Plasmodesmata (PD) serve for the exchange of information in form of miRNA, proteins, and mRNA between adjacent cells in the course of plant development. This fundamental role of PD is well established in angiosperms but has not yet been traced back to the evolutionary ancient plant taxa where functional studies lag behind studies of PD structure and ontogenetic origin. There is convincing evidence that the ability to form secondary (post-cytokinesis) PD, which can connect any adjacent cells, contrary to primary PD which form during cytokinesis and link only cells of the same lineage, appeared in the evolution of higher plants at least twice: in seed plants and in some representatives of the Lycopodiophyta. The (in)ability to form secondary PD is manifested in the symplasmic organization of the shoot apical meristem (SAM) which in most taxa of seedless vascular plants differs dramatically from that in seed plants. Lycopodiophyta appear to be suitable models to analyze the transport of developmental regulators via PD in SAMs with symplasmic organization both different from, as well as analogous to, that in angiosperms, and to understand the evolutionary aspects of the role of this transport in the morphogenesis of vascular plant taxa.

Use of Gold Nanoparticles to Detect Water Uptake in Vascular Plants

Hwang, Bae Geun; Ahn, Sungsook; Lee, Sang Joon
Fonte: Public Library of Science Publicador: Public Library of Science
Tipo: Artigo de Revista Científica
Publicado em 11/12/2014 EN
Relevância na Pesquisa
46.18%
Direct visualization of water-conducting pathways and sap flows in xylem vessels is important for understanding the physiology of vascular plants and their sap ascent. Gold nanoparticles (AuNPs) combined with synchrotron X-ray imaging technique is a new promising tool for investigating plant hydraulics in opaque xylem vessels of vascular plants. However, in practical applications of AuNPs for real-time quantitative visualization of sap flows, their interaction with a vascular network needs to be verified in advance. In this study, the effect of AuNPs on the water-refilling function of xylem vessels is experimentally investigated with three monocot species. Discrepancy in the water uptakes starts to appear at about 20 min to 40 min after the supply of AuNP solution to the test plant by the possible gradual accumulation of AuNPs on the internal structures of vasculature. However conclusively, it is observed that the water-refilling speeds in individual xylem vessels are virtually unaffected by hydrophilically surface-modified AuNPs (diameter ∼20 nm). Therefore, the AuNPs can be effectively used as flow tracers in the xylem vessels in the first 20∼30 min without any physiological barrier. As a result, AuNPs are found to be useful for visualizing various fluid dynamic phenomena occurring in vascular plants.

Functional Anatomy and Biophysical Mechanisms of Fluid Transport in Vascular Plants : Implications for Structural Optimisation in Fossil and Extant Plants; Gefässanatomie und Biophysik des Fluidtransportes in Gefässpflanzen : Konsequenzen für die strukturelle Optimierung fossiler und rezenter Pflanzen

Konrad, Wilfried
Fonte: Universität Tübingen Publicador: Universität Tübingen
Tipo: Dissertation; info:eu-repo/semantics/doctoralThesis
EN
Relevância na Pesquisa
66.2%
In plants, water and carbon dioxide molecules are transported either in liquid or gaseous state: From the roots to the leaves water flows as a liquid. Between leaves and atmosphere water and carbon dioxide are exchanged as gases. Accordingly, the driving forces and mechanisms of transport are also different. The driving force of the water transport between roots and leaves is transpiration which takes place in the gas-filled intercellulars of the leaves. Attached to this tissue is a network of water molecules which extends down to the ground water. This network is held together by short-ranged electro-magnetic forces (van der Waals forces'') between adjacent water molecules. Due to the weight of the molecular network the intermolecular forces are tensile which is --- macroscopically speaking --- equivalent to a negative water pressure. Such a system is thermodynamically metastable and has the tendency to collapse into a stable state, caused either by statistical fluctuations or by disturbances originating from the environment (e.g. by wind or animal action). In any case, gas bubbles containing water vapour and/or air develop within the water column and may lead to embolism, i.e. the breakdown of the water flow. Vascular plants have developed various strategies to cope with such incidents: they employ a multitude of parallel conduits which are segmented and (both laterally and longitudinally) connected by valve-like openings (pits''). Thus...

The origin and early evolution of tracheids in vascular plants: integration of palaeobotanical and neobotanical data.

Friedman, W E; Cook, M E
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em 29/06/2000 EN
Relevância na Pesquisa
46.34%
Although there is clear evidence for the establishment of terrestrial plant life by the end of the Ordovician, the fossil record indicates that land plants remained extremely small and structurally simple until the Late Silurian. Among the events associated with this first major radiation of land plants is the evolution of tracheids, complex water-conducting cells defined by the presence of lignified secondary cell wall thickenings. Recent palaeobotanical analyses indicate that Early Devonian tracheids appear to possess secondary cell wall thickenings composed of two distinct layers: a degradation-prone layer adjacent to the primary cell wall and a degradation-resistant (possibly lignified) layer next to the cell lumen. In order to understand better the early evolution of tracheids, developmental and comparative studies of key basal (and potentially plesiomorphic) extant vascular plants have been initiated. Ultrastructural analysis and enzyme degradation studies of wall structure (to approximate diagenetic alterations of fossil tracheid structure) have been conducted on basal members of each of the two major clades of extant vascular plants: Huperzia (Lycophytina) and Equisetum (Euphyllophytina. This research demonstrates that secondary cell walls of extant basal vascular plants include a degradation-prone layer ('template layer') and a degradation-resistant layer ('resistant layer'). This pattern of secondary cell wall formation in the water-conducting cells of extant vascular plants matches the pattern of wall thickenings in the tracheids of early fossil vascular plants and provides a key evolutionary link between tracheids of living vascular plants and those of their earliest fossil ancestors. Further studies of tracheid development and structure among basal extant vascular plants will lead to a more precise reconstruction of the early evolution of water-conducting tissues in land plants...

Cambio climático y diversidad de la flora vascular en las montañas tabulares de Guayana

Rull del Castillo, Valentí; Vegas Vilarrubia, Teresa; Nogué Bosch, Sandra
Fonte: Universidade Autônoma de Barcelona Publicador: Universidade Autônoma de Barcelona
Tipo: Article; info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion Formato: application/pdf
Publicado em //2005 SPA
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56.05%
Una de las posibles consecuencias del calentamiento global es la extinción de especies de alta montaña por migración ascendente de las condiciones ambientales y pérdida de hábitat, fenómeno que, por el momento, ha sido considerado únicamente en montañas templadas y boreales. Este trabajo analiza la misma situación en montañas tropicales y estima el grado de amenaza de la flora vascular de las cimas de las montañas neotropicales de Guayana, al norte de Sudamérica. Del estudio basado en una muestra de 83 especies, entre aproximadamente el 8 y el 33% de las mismas se encuentran en peligro de extinguirse debido a la desaparición de su hábitat. La mayoría de estas especies son endémicas de Guayana, por lo que su desaparición afectaría a la biodiversidad global.; Among the potential consequences of the projected global warming on high-mountain environments is biodiversity loss by upward migration of environmental conditions and the consequent habitat vanishing for upland species. So far, such effect has been considered only for temperate and boreal mountain ranges. Here, the same situation is analysed on the neotropical Guayana mountains, in northern South America. A preliminary appraisal based on 83 species of vascular plants shows that 8-33% of them are threatened of extinction by habitat loss. Most are endemic...

New combinations in Balearic plants

Rosselló, Josep Antoni; Sáez, Llorenç; Torres, Néstor
Fonte: Universidade Autônoma de Barcelona Publicador: Universidade Autônoma de Barcelona
Tipo: Artigo de Revista Científica Formato: application/pdf
Publicado em //1997 ENG
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56%
Se proponen tres nuevas combinaciones nomenclaturales de plantas endémicas de las Islas Baleares: Ranunculus paludosus Poiret subsp. barceloi (Grau) Rosselló, L. Sáez & N. Torres, Omonis crispa L. subsp. zachackei (F. Herm.) Rosselló & L. Sáez y Ophrys bertolonii Morettii subsp. baleárica (Delforge) Rosselló & L. Sáez.; Three new nomenclatural changes of vascular plants endemic of the Balearic archipelago are proposed: Ranunculus paludosus Poiret subsp. Barceloi (Grau) Rosselló, L. Sáez & N. Torres, Ononis crispa L. subsp. zschackei (F. Herm.) Rosselló & L. Sáez and Ophrys bertolonii Morettii subsp. baleárica (Delforge) Rosselló & L. Sáez.

Index balearicum : An annotated check-list of the vascular plants described from the Balearic Islands.

Rosselló, Josep A.; Sáez, Llorenç
Fonte: Universidade Autônoma de Barcelona Publicador: Universidade Autônoma de Barcelona
Tipo: Artigo de Revista Científica Formato: application/pdf
Publicado em //2000 ENG
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56%
Es presenta una check-list deis noms de plantes vasculars el material tipus de les quals es originari si més no presumiblement, de les illes Balears. Per a cada nom s'indiquen els sinònims nomenclaturals, juntament amb la localització deis materials tipus així com comentaris de caire taxonòmic, corològico nomenclatural. Es tipifiquen 176 noms i es proposen tres canvis nomenclaturals: Arenaria bolosii (Küpfer) comb. nov., Coristospermum huteri (Porta) comb. nov. i Dactyliss glomerata subsp. ibizensis (Gand.) combonov; Se presenta una check-list de nombres de plantas vasculares basadas sobre material originario, o presumiblemente originario, de las islas Baleares. Para cada nombre se indican los sinónimos nomenclaturales, la localización de los materiales tipo, así como comentarios de carácter taxonómico, corológico o nomenclatural. Se tipifican 176 nombres y se proponen tres cambios nomenclaturales: Arenaria bolosii (Küpfer) comb. nov., Coristospermum huteri (Porta) comb. nov. y Dactyliss glomerata subsp. ibizensis (Gand.) combonov.; A check-list of vascular plant is presented, the type material of which is of Balearic origin, or presumed to be as such. For each name a list of its nomenclatural synonyms, together with the location of the type specimens and miscellaneous comments about its taxonomy...

New data on vascular plants from Montseny massif (northeastern Iberian Peninsula)

Sáez, Llorenç; Galán de Mera, Antonio; Pyke, Samuel; Pié, Gerard; Carnicero, Pau
Fonte: Universidade Autônoma de Barcelona Publicador: Universidade Autônoma de Barcelona
Tipo: Artigo de Revista Científica Formato: application/pdf
Publicado em //2015 ENG
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66.11%
En aquest treball es presenta un conjunt de notes sobre distribució i en algun cas de morfologia de plantes vasculars del massís del Montseny (nord-est de la península Ibèrica). Aquest article aporta dades per a 91 tàxons, 72 dels quals són noves citacions per al massís del Montseny. D’aquests 72 tàxons, 46 són autòctons i 26 corresponen a elements al·lòctons.; Notes on distribution and morphology of some vascular plants from Montseny massif (north-eastern Iberian Peninsula) are presented. This paper deals with 91 taxa, 72 of which are new for the Montseny massif. Of these 72 taxa, 46 are native and 26 are non-native plants.; En este trabajo se presenta un conjunto de notas sobre distribución y en algún caso de morfología de plantas vasculares del macizo del Montseny (nordeste de la península Ibérica). Este artículo aporta datos para un total de 91 taxones, 72 de los cuales son nuevas citas para el macizo del Montseny. De estos 72 taxones, 46 son autóctonos y 26 corresponden a elementos alóctonos.

Herbaria century record of increasing eutrophication in Spanish terrestrial ecosystems

Peñuelas, Josep
Fonte: Universidade Autônoma de Barcelona Publicador: Universidade Autônoma de Barcelona
Tipo: Artigo de Revista Científica Formato: application/pdf
Publicado em //2001 ENG
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46.15%
Additional biological evidence is presented for the alteration of biogeochemical cycles by human activities. The leaf δ15N and the concentrations of nutrients in herbarium specimens of 24 species of vascular plants and 3 species of bryophytes collected in northern and eastern regions of Spain have substantially changed throughout the XX century. In the second half of the century, when anthropogenic nitrogen fixation and mobilization started to increase rapidly, leaf δ15N values started to decrease strongly, indicating that additional anthropogenic nitrogen is being retained in Spanish terrestrial ecosystems. The concentration of nutrients in vascular plants did not present any clear pattern, but there were increasing concentrations of N and other nutrients (P, K, and S) in the last decades in bryophytes, which are usually better biomonitors of airborne chemicals than vascular plants. Important consequences for ecosystem structure and functioning such as enhancement of the carbon sink or changes in community biodiversity and species distribution may be expected from this increase in eutrophication.