LIVIVO - Das Suchportal für Lebenswissenschaften

switch to English language
Erweiterte Suche

Ihre letzten Suchen

  1. AU="Simon, Marcelo F"
  2. AU="Ahmad, W Haj" AU="Ahmad, W Haj"
  3. AU="Drillich, Ann"
  4. AU="Bennett, Hamilton"
  5. AU="Al Kaabi, Hoor"
  6. AU="Hecht, Harvey S"
  7. AU="Minsky, Bruce D"
  8. AU="Manzano, Joanna-Grace M"
  9. AU="Acín-Pérez, Rebeca"
  10. AU="Kamakura, Tsukasa"
  11. AU="Lee, Theodore K"
  12. AU="So, Marvin"

Suchergebnis

Treffer 1 - 10 von insgesamt 60

Suchoptionen

  1. Artikel: Misleading fruits: The non-monophyly of

    Borges, Leonardo M / Inglis, Peter W / Simon, Marcelo F / Ribeiro, Pétala Gomes / de Queiroz, Luciano P

    PhytoKeys

    2022  Band 205, Seite(n) 239–259

    Abstract: Generic delimitation ... ...

    Abstract Generic delimitation in
    Sprache Englisch
    Erscheinungsdatum 2022-08-22
    Erscheinungsland Bulgaria
    Dokumenttyp Journal Article
    ZDB-ID 2579891-1
    ISSN 1314-2003 ; 1314-2011
    ISSN (online) 1314-2003
    ISSN 1314-2011
    DOI 10.3897/phytokeys.205.82275
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

    Zusatzmaterialien

    Kategorien

  2. Artikel ; Online: Misleading fruits: The non-monophyly of Pseudopiptadenia and Pityrocarpa supports generic re-circumscriptions and a new genus within mimosoid legumes

    Borges, Leonardo M. / Inglis, Peter W. / Simon, Marcelo F. / Ribeiro, Pétala Gomes / de Queiroz, Luciano P.

    PhytoKeys. 2022 Aug. 22, v. 205 p.239-259

    2022  

    Abstract: AbstractGeneric delimitation in Piptadenia and allies (mimosoid legumes) has been in a state of flux, particularly caused by over-reliance on fruit and seed morphology to segregate species out of Piptadenia into the genera Parapiptadenia, Pityrocarpa ... ...

    Abstract AbstractGeneric delimitation in Piptadenia and allies (mimosoid legumes) has been in a state of flux, particularly caused by over-reliance on fruit and seed morphology to segregate species out of Piptadenia into the genera Parapiptadenia, Pityrocarpa and Pseudopiptadenia. Although supporting their segregation from Piptadenia, previous phylogenetic analyses suggested that some of these segregated genera are not monophyletic. Here, we test the monophyly of Parapiptadenia, Pityrocarpa and Pseudopiptadenia with dense taxon sampling across these genera, including the type species of each genus. Our analysis recovers Parapitadenia as monophyletic, but places Pseudopiptadenia species in two distinct lineages, one of which includes all three species of Pityrocarpa. Given that the type species of both Pseudopiptadenia and Pityrocarpa are nested in the same clade, we subsume Pseudopiptadenia under the older name Pityrocarpa. The remaining Pseudopiptadenia species are assigned to the new genus Marlimorimia. Alongside high molecular phylogenetic support, recognition of Parapiptadenia, Pityrocarpa and Marlimorimia as distinct genera is also supported by combinations of morphological traits, several of which were previously overlooked.
    Schlagwörter Parapiptadenia ; Piptadenia ; Pityrocarpa ; Pseudopiptadenia ; fruits ; monophyly ; new genus ; seed morphology ; Caesalpinioideae ; Fabaceae ; Leguminosae ; Stryphnodendron clade ; tropical America
    Sprache Englisch
    Erscheinungsverlauf 2022-0822
    Umfang p. 239-259.
    Erscheinungsort Pensoft Publishers
    Dokumenttyp Artikel ; Online
    ZDB-ID 2579891-1
    ISSN 1314-2003 ; 1314-2011
    ISSN (online) 1314-2003
    ISSN 1314-2011
    DOI 10.3897/phytokeys.205.82275
    Datenquelle NAL Katalog (AGRICOLA)

    Zusatzmaterialien

    Kategorien

  3. Artikel ; Online: Monitoring the impacts of a mega-dam on Amazonian understorey herbs

    Medeiros, Marcelo B. / Oliveira, Washington L. / Rodrigues, Flávio R.O. / Silva, Renata D. / Ferreira, Íris J.K. / Ayala, Wellyngton E. / Silva, Suelma R. / Souza, Rafaela T. / Simon, Marcelo F.

    Forest Ecology and Management. 2023 May, v. 536 p.120909-

    2023  

    Abstract: Mega-dams have drastically altered the pulse of natural flooding in rivers of the Amazon, negatively affecting the biodiversity of different forest ecosystems. This study aimed to investigate the impacts of the Jirau dam on herbaceous assemblages, a ... ...

    Abstract Mega-dams have drastically altered the pulse of natural flooding in rivers of the Amazon, negatively affecting the biodiversity of different forest ecosystems. This study aimed to investigate the impacts of the Jirau dam on herbaceous assemblages, a relatively little studied biodiversity component. To accomplish this, we surveyed understorey herbs in 22 permanent plots (375 m² each) between 2012 and 2019, before and after filling of the Jirau dam, and also measured a set of environmental predictors. Sampling comprised 178 morphospecies and 43,335 individuals. We found that species compositions in the pre-dam period differed in each of the sampled habitats (terra firme, transitional forest, várzea, and campinarana), and that such differences were mostly correlated with sum of bases, topography, C/N ratio, silt and pH. Environmental associations differed among three major groups of herbs (Ferns, Poales and Zingiberales). During the post-dam period, flooded plots showed high rates of mortality and recruitment close to 100 % and a sharp decline in species richness while non-flooded plots showed relative stability for these parameters. The number of flooded days and habitat type were strong predictors of mortality and recruitment rates. A combination of canopy opening driven by tree mortality and seasonal flooding after filling of the Jirau reservoir altered herb species composition in flooded plots, favouring the recruitment of Poales. Overall, herbaceous plants showed higher sensitivity to flooding caused by the Jirau dam when compared to trees sampled in the same site, reinforcing their potential as biodiversity targets for environmental assessments.
    Schlagwörter Poales ; Zingiberales ; administrative management ; canopy ; forest ecology ; forests ; habitats ; morphospecies ; mortality ; pH ; silt ; species diversity ; topography ; tree mortality ; understory ; Flooding ; Madeira River ; Pteridophytes ; Recruitment
    Sprache Englisch
    Erscheinungsverlauf 2023-05
    Erscheinungsort Elsevier B.V.
    Dokumenttyp Artikel ; Online
    ZDB-ID 751138-3
    ISSN 0378-1127
    ISSN 0378-1127
    DOI 10.1016/j.foreco.2023.120909
    Datenquelle NAL Katalog (AGRICOLA)

    Zusatzmaterialien

    Kategorien

  4. Artikel: On the floristic identity of Amazonian vegetation types

    Oliveira‐Filho, Ary T / Dexter, Kyle G / Pennington, R. Toby / Simon, Marcelo F / Bueno, Marcelo L / Neves, Danilo M

    Biotropica. 2021 May, v. 53, no. 3

    2021  

    Abstract: The Amazon forest is far from uniform, containing different forest types and even savannas, but quantitative analyses of this variation are lacking. Here, we applied ordination analyses to test the floristic differentiation among Amazonian vegetation ... ...

    Abstract The Amazon forest is far from uniform, containing different forest types and even savannas, but quantitative analyses of this variation are lacking. Here, we applied ordination analyses to test the floristic differentiation among Amazonian vegetation types using data for virtually all known tree species occurring in the Amazon (8224), distributed across 1584 sites. We also performed multiple regressions to assess the role of climate and substrate in shaping continental‐scale patterns of community composition across Amazonia. We find that the traditional classification of Amazonian vegetation types is consistent with quantitative patterns of tree species composition. High elevation and the extremes of substrate‐related factors underpin the floristic segregation of environmentally “marginal” vegetation types and terra firme forests with climatic factors being relatively unimportant. These patterns hold at continental scales, with sites of similar vegetation types showing higher similarity between them regardless of geographic distance, which contrasts with the idea of large‐scale variation among geographic regions (e.g., between the Guiana Shield and southwestern Amazon) representing the dominant floristic pattern in the Amazon. In contrast to other tropical biomes in South America, including the Mata Atlântica (second largest rain forest biome in the neotropics), the main floristic units in the Amazon are not geographically separated, but are edaphically driven and spatially interdigitated across Amazonia. Two thirds of terra firme tree species are restricted to this vegetation type, while among marginal vegetation types, only white‐sand forests (campinaranas) have a substantial proportion of restricted species, with other vegetation types sharing large numbers of species.
    Schlagwörter altitude ; community structure ; ecosystems ; rain forests ; species diversity ; trees ; Amazonia ; South America
    Sprache Englisch
    Erscheinungsverlauf 2021-05
    Umfang p. 767-777.
    Erscheinungsort John Wiley & Sons, Ltd
    Dokumenttyp Artikel
    Anmerkung NAL-AP-2-clean ; JOURNAL ARTICLE
    ZDB-ID 2052061-X
    ISSN 1744-7429 ; 0006-3606
    ISSN (online) 1744-7429
    ISSN 0006-3606
    DOI 10.1111/btp.12932
    Datenquelle NAL Katalog (AGRICOLA)

    Zusatzmaterialien

    Kategorien

  5. Artikel: Environmental variables and dispersal barriers explain broad‐scale variation in tree species composition across Neotropical non‐flooded evergreen forests

    Cupertino‐Eisenlohr, Mônica A. / Eisenlohr, Pedro V. / Barros‐Rosa, Lucas / Oliveira‐Filho, Ary Teixeira de / Simon, Marcelo F.

    Journal of vegetation science. 2021 May, v. 32, no. 3

    2021  

    Abstract: QUESTIONS: We examined the drivers of tree species variation across Neotropical non‐flooded evergreen forests (NNFEFs) to answer the following questions: can floristic groups be differentiated based on environmental predictors? How do bioclimatic, ... ...

    Abstract QUESTIONS: We examined the drivers of tree species variation across Neotropical non‐flooded evergreen forests (NNFEFs) to answer the following questions: can floristic groups be differentiated based on environmental predictors? How do bioclimatic, topographic, edaphic predictors and dispersal barriers contribute to explain the floristic variation throughout NNFEFs? LOCATION: Neotropical region. METHODS: Based on 1,843 sites (circular areas with a diameter of 10 km), 15,072 species and 509,793 occurrence records of trees, as well as on environmental variables (42 bioclimatic, 13 edaphic and four topographic variables) and dispersal barriers (based on ecological and geographical dispersal suitability), we tested whether environmental predictive variables can discriminate NNFEF floristic groups, and built canonical models and variation partitioning to assess which variables contributed most to the floristic variation. RESULTS: Despite extensive overlap in predictive variables, Amazon and Atlantic Forest were the most differentiated among the nine NNFEF groups. Floristic variation along NNFEFs was mainly determined by environmental factors (54.1%), with topographic and edaphic variables, mainly topographic wetness index and pH respectively, representing the most important predictors followed by a combination of environmental factors and dispersal barriers (22.7%). The fraction of pure dispersal barriers also contributed significantly to our model (3.7%), especially considering the second canonical axis. CONCLUSIONS: The high importance of soil and topographic variables indicates that the species have a relatively narrow niche driven by such factors, suggesting that conservation strategies should not be generalized for NNFEFs. In addition, dispersal barriers do not seem to have prevented floristic exchanges between most NNFEF groups, except in the Atlantic Forest.
    Schlagwörter Neotropics ; interspecific variation ; models ; pH ; soil ; species diversity ; topography ; trees
    Sprache Englisch
    Erscheinungsverlauf 2021-05
    Erscheinungsort John Wiley & Sons, Ltd
    Dokumenttyp Artikel
    Anmerkung JOURNAL ARTICLE
    ZDB-ID 1053769-7
    ISSN 1100-9233
    ISSN 1100-9233
    DOI 10.1111/jvs.13026
    Datenquelle NAL Katalog (AGRICOLA)

    Zusatzmaterialien

    Kategorien

  6. Artikel ; Online: New segregates from the Neotropical genus Stryphnodendron (Leguminosae, Caesalpinioideae, mimosoid clade)

    de Lima, Alexandre G. / Paula-Souza, Juliana de / Ringelberg, Jens J. / Simon, Marcelo F. / de Queiroz, Luciano P. / Borges, Leonardo M. / de F. Mansano, Vidal / Souza, Vinicius C. / Scalon, Viviane R.

    PhytoKeys. 2022 Aug. 22, v. 205, p. 203-237

    2022  , Seite(n) 203–237

    Abstract: Introduction: Non-monophyly is an issue for several mimosoid legume genera, with relatively few, but significant exceptions as seems to be the case in the genera Mimosa L. (Simon et al. 2011) and Inga Mill. (Dexter et al. 2017). As well as questioning ... ...

    Abstract Introduction: Non-monophyly is an issue for several mimosoid legume genera, with relatively few, but significant exceptions as seems to be the case in the genera Mimosa L. (Simon et al. 2011) and Inga Mill. (Dexter et al. 2017). As well as questioning the characters that were traditionally used to circumscribe mimosoid genera, various molecular phylogenetic studies have revealed the need for new taxonomic circumscriptions of previously large (e.g., Acacia Mill.), medium sized (e.g., Calliandra Benth.; Souza et al. 2013; Prosopis L.; Hughes et al. 2022) and small genera (e.g., Pseudopiptadenia Rauschert; Simon et. al. 2016; Borges et al. 2022).
    Schlagwörter Caesalpinioideae ; Neotropics ; Stryphnodendron ; Non-monophyly is a prominent issue in mimosoid legumes ; even in some of the less speciose genera such as the neotropical genus Stryphnodendron. This genus includes 35 species occurring from Nicaragua to Southern Brazil mostly in humid forests and savannas. Previous taxonomic studies of Stryphnodendron have highlighted morphologically distinct groups within the genus ; recognized by differences on leaves (number of pinnae and size of leaflets) ; inflorescences (a simple or compound thyrse) ; and fruit types (legume ; nucoid legume or follicle). Recent phylogenetic analyses have confirmed the non-monophyly of Stryphnodendron ; supporting the recognition of three independent and morphologically well-delimited genera. Here we re-circumscribe Stryphnodendron and propose the two new genera Gwilymia and Naiadendron. In addition ; we also provide an updated taxonomic account of the closely related genus Microlobius ; including the proposal of a lectotype for the single species in the genus. Gwilymia ; Leguminosae ; Microlobius ; Naiadendron ; Parapiptadenia ; Phylogeny ; Piptadenia group ; Pityrocarpa ; Pseudopiptadenia
    Sprache Englisch
    Erscheinungsverlauf 2022-0822
    Umfang p. 203-237
    Erscheinungsort Pensoft Publishers
    Dokumenttyp Artikel ; Online
    ZDB-ID 2579891-1
    ISSN 1314-2003 ; 1314-2011
    ISSN (online) 1314-2003
    ISSN 1314-2011
    DOI 10.3897/phytokeys.205.82220
    Datenquelle NAL Katalog (AGRICOLA)

    Zusatzmaterialien

    Kategorien

  7. Artikel: New segregates from the Neotropical genus

    de Lima, Alexandre G / de Paula-Souza, Juliana / Ringelberg, Jens J / Simon, Marcelo F / de Queiroz, Luciano P / Borges, Leonardo M / de F Mansano, Vidal / Souza, Vinicius C / Scalon, Viviane R

    PhytoKeys

    2022  Band 205, Seite(n) 203–237

    Sprache Englisch
    Erscheinungsdatum 2022-08-22
    Erscheinungsland Bulgaria
    Dokumenttyp Journal Article
    ZDB-ID 2579891-1
    ISSN 1314-2003 ; 1314-2011
    ISSN (online) 1314-2003
    ISSN 1314-2011
    DOI 10.3897/phytokeys.205.82220
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

    Zusatzmaterialien

    Kategorien

  8. Artikel ; Online: Fast diversification through a mosaic of evolutionary histories characterizes the endemic flora of ancient Neotropical mountains.

    Vasconcelos, Thais N C / Alcantara, Suzana / Andrino, Caroline O / Forest, Félix / Reginato, Marcelo / Simon, Marcelo F / Pirani, José R

    Proceedings. Biological sciences

    2020  Band 287, Heft 1923, Seite(n) 20192933

    Abstract: Mountains are among the most biodiverse areas on the globe. In young mountain ranges, exceptional plant species richness is often associated with recent and rapid radiations linked to the mountain uplift itself. In ancient mountains, however, orogeny ... ...

    Abstract Mountains are among the most biodiverse areas on the globe. In young mountain ranges, exceptional plant species richness is often associated with recent and rapid radiations linked to the mountain uplift itself. In ancient mountains, however, orogeny vastly precedes the evolution of vascular plants, so species richness has been explained by species accumulation during long periods of low extinction rates. Here we evaluate these assumptions by analysing plant diversification dynamics in the
    Mesh-Begriff(e) Altitude ; Biodiversity ; Biological Evolution ; Ecosystem ; Phylogeny ; Plants/classification ; South America
    Sprache Englisch
    Erscheinungsdatum 2020-03-18
    Erscheinungsland England
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 209242-6
    ISSN 1471-2954 ; 0080-4649 ; 0962-8452 ; 0950-1193
    ISSN (online) 1471-2954
    ISSN 0080-4649 ; 0962-8452 ; 0950-1193
    DOI 10.1098/rspb.2019.2933
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

    Zusatzmaterialien

    Kategorien

  9. Artikel: Low cytomolecular diversification in the genus Stylosanthes Sw. (Papilionoideae, Leguminosae).

    Franco, Ana Luiza / Figueredo, Amanda / Pereira, Lívia de Moraes / Sousa, Saulo Marçal de / Souza, Gustavo / Carvalho, Marcelo Ayres / Simon, Marcelo F / Viccini, Lyderson Facio

    Genetics and molecular biology

    2020  Band 43, Heft 1, Seite(n) e20180250

    Abstract: Stylosanthes (Papilionoideae, Leguminosae) is a predominantly Neotropical genus with ~48 species that include worldwide important forage species. This study presents the chromosome number and morphology of eight species of the genus Stylosanthes (S. ... ...

    Abstract Stylosanthes (Papilionoideae, Leguminosae) is a predominantly Neotropical genus with ~48 species that include worldwide important forage species. This study presents the chromosome number and morphology of eight species of the genus Stylosanthes (S. acuminata, S. gracilis, S. grandifolia, S. guianensis, S. hippocampoides, S. pilosa, S. macrocephala, and S. ruellioides). In addition, staining with CMA and DAPI, in situ hybridization with 5S and 35S rDNA probes, and estimation of DNA content were performed. The interpretation of Stylosanthes chromosome diversification was anchored by a comparison with the sister genus Arachis and a dated molecular phylogeny based on nuclear and plastid loci. Stylosanthes species showed 2n = 20, with low cytomolecular diversification regarding 5S rDNA, 35S rDNA, and genome size. Arachis has a more ancient diversification (~7 Mya in the Pliocene) than the relatively recent Stylosanthes (~2 Mya in the Pleistocene), and it seems more diverse than its sister lineage. Our data support the idea that the cytomolecular stability of Stylosanthes in relation to Arachis could be a result of its recent origin. The recent diversification of Stylosanthes could also be related to the low morphological differentiation among species, and to the recurrent formation of allopolyploid complexes.
    Sprache Englisch
    Erscheinungsdatum 2020-03-06
    Erscheinungsland Brazil
    Dokumenttyp Journal Article
    ZDB-ID 1445712-x
    ISSN 1678-4685 ; 1415-4757
    ISSN (online) 1678-4685
    ISSN 1415-4757
    DOI 10.1590/1678-4685-GMB-2018-0250
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

    Zusatzmaterialien

    Kategorien

  10. Artikel: Palm distribution patterns in the southwestern Brazilian Amazon: Impact of a large hydroelectric dam

    dos Santos, Ednéia A / Costa, Flávia R.C / Ferreira, Evandro J.L / Medeiros, Marcelo B / Oliveira, Washington L / Simon, Marcelo F

    Forest ecology and management. 2020 May 01, v. 463

    2020  

    Abstract: Mega hydroelectric dams cause loss of habitat for many species and lead to local or regional extinction. Despite these dire facts, little is known about the impact of these mega-dams on Amazonia. Using palms as a model, we investigated this question by ... ...

    Abstract Mega hydroelectric dams cause loss of habitat for many species and lead to local or regional extinction. Despite these dire facts, little is known about the impact of these mega-dams on Amazonia. Using palms as a model, we investigated this question by sampling 26 1-ha plots distributed in the influence areas of the Jirau mega-dam in southwestern Brazilian Amazonia. We examined palm community patterns and species distributions as a function of environmental variables, as well as the effect of this large dam on plant survival. Palm communities on the banks of the Madeira River differ among three main habitats sampled (campinarana, terra-firme and várzea forests), and these differences are associated with the gradient of C, pH, N, P, soil texture, slope, and depth to the water-table. The level of the Madeira River raised after the construction of the Jirau mega-dam, directly affecting the populations of 61.3% of the palm species, particularly those species associated to areas with silty soils, low slope, and low depth to the water-table. Várzea and terra-firme forests near the river, as well as low-lying plots, even those distant from the river, were affected by the filling of the reservoir. Várzea forests and campinaranas had a greater proportion of palm species flooded by the reservoir and the reduction of water-table depth. Várzea forests and campinaranas harbor distinct palm communities from the terra-firme forests and require priority in conservation policies and management to mitigate harmful environmental impacts in the Amazon.
    Schlagwörter dams (hydrology) ; environmental factors ; environmental impact ; extinction ; forests ; habitats ; issues and policy ; models ; pH ; rivers ; silty soils ; soil texture ; water table ; Amazonia ; Brazil
    Sprache Englisch
    Erscheinungsverlauf 2020-0501
    Erscheinungsort Elsevier B.V.
    Dokumenttyp Artikel
    ZDB-ID 751138-3
    ISSN 0378-1127
    ISSN 0378-1127
    DOI 10.1016/j.foreco.2020.118032
    Datenquelle NAL Katalog (AGRICOLA)

    Zusatzmaterialien

    Kategorien

Zum Seitenanfang