21 documents found, page 1 of 3
Pervasive gaps in Amazonian ecological research
Carvalho, Raquel L.; Resende, Angelica F.; Barlow, Jos; França, Filipe M.; Moura, Mario R.; Maciel, Rafaella; Alves-Martins, Fernanda; Shutt, JackBiodiversity loss is one of the main challenges of our time,1,2 and attempts to address it require a clear un derstanding of how ecological communities respond to environmental change across time and space.3,4 While the increasing availability of global databases on ecological communities has advanced our knowledge of biodiversity sensitivity to environmental changes,5–7 vast areas of the tropics remain underst...
Biochar and conventional compost reduce hysteresis and increase phosphorus deso...
Guedes, Rafael Silva; Pinto, Duane Azevedo; Ramos, Sílvio Junio; Dias, Yan Nunes; Junior, Cecílio Fróis Caldeira; Gastauer, MarkusPhosphorus (P) fixation in the soil reduces the utilization of this element by plants and can be one of the main problems for fertilization management in soils containing Fe oxides. As a strategy to minimize the effects of P retention, organic materials, such as biochar or commercial composts, may be useful tools to maintain P availability and delay immobilization of this element in the soil, thereby benefiting...
Updated angiosperm family tree for analyzing phylogenetic diversity and communi...
Gastauer, Markus; Meira Neto, João Augusto AlvesThe computation of phylogenetic diversity and phylogenetic community structure demands an accurately calibrated, high-resolution phylogeny, which reflects current knowledge regarding diversification within the group of interest. Herein we present the angiosperm phylogeny R20160415.new, which is based on the topology proposed by the Angiosperm Phylogeny Group IV, a recently released compilation of angiosperm div...
Environmental severity promotes phylogenetic clustering in campo rupestre veget...
Gastauer, Markus; Miazaki, Angela S.; Meira-Neto, João A.A.The stress-dominance hypothesis postulates that the importance of competition in plant communities declines with increasing environmental stress while the importance of environmental filters increases. To test this hypothesis for campo rupestre vegetation, we analyzed phylogenetic diversity and community structure of angiosperm communities at two study sites within the Itacolomi State Park, Minas Gerais, Brazil...
Longidorids from Minas Gerais State, Brazil, with focus on the morphometric var...
Jesus, Dalila Sêni de; Oliveira, Rosângela D’Arc de Lima; Oliveira, Cláudio Marcelo Gonçalves de; Gastauer, Markus; Alexander, Colin JamesThe occurrence and distribution of Longidorid nematodes in the state of Minas Gerais, Brazil, were assessed in 126 soil samples collected at different habitats in 12 municipalities across the state. The nematodes were extracted from 1 kg of soil and morphometric measures and identification of species were conducted using a light microscope with the aid of a camera lucida. Eight species of Xiphinema were identif...
Functional antagonism between nitrogen-fixing leguminous trees and calcicole-dr...
Meira-Neto, João Augusto Alves; Tolentino, Gláucia Soares; Silva, Maria Carolina Nunes Alves da; Neri, Andreza Viana; Gastauer, MarkusThe Cerrado is the largest savanna of South America and its physiognomy varies from savanna to woodlands. There are two main types of woodlands in the Cerrado: dystrophic woodlands, dominated by N-fixing leguminous trees (LEG), and mesotrophic woodlands dominated by non-leguminous drought-tolerant trees (DRY), which are calcicoles and sensitive to Al3+. The working hypothesis is that LEG and DRY are functional ...
Phylogenetic community structure reveals differences in plant community assembl...
Gastauer, Markus; Saporetti-Junior, Amílcar W.; Valladares, Fernando; Meira-Neto, João A. A.Mussununga, an oligotrophic sandy savanna ecosystem, comprises distinct physiognomies along fire, water and nutrient availability gradients. Grasslands and woodlands are constrained at the opposite poles of these gradients, with grasslands occurring in areas with poorer soils and higher levels of both water-stress and fire intensity. According to the stress-dominance hypothesis, one might expect the importance ...
Phylogenetic structure is determined by patch size in rock outcrop vegetation o...
Villa, Pedro Manuel; Gastauer, Markus; Martins, Sebastião Venâncio; Carrión, Juan Fernando; Campos, Prímula Viana; Heringer, GustavoAinda que os inselbergs ao redor do mundo sejam ecossistemas icônicos, pouco se sabe sobre os mecanismos subjacentes que estruturam suas comunidades vegetais, especialmente nas manchas de vegetação sobre afloramentos rochosos. Espera-se que as restrições ambientais causem agrupamento filogenético quando os nichos ecológicos são conservados dentro das linhagens evolutivas. Nós testamos se as manchas de vegetação...
Interactions, environmental sorting and chance: phylostructure of a tropical fo...
Gastauer, Markus; Meira-Neto, João Augusto AlvesDensity dependence, environmental sorting and chance have been discussed for the purpose of understanding, predicting and explaining the species richness, composition and structural parameters of living communities. Different ecological mechanisms occur individually in an overlapping manner, so the structure of each local community is influenced by an independent mixture of these factors. To identify which of t...
Facilitation as a driver of plant assemblages in Caatinga
Carrión, Juan Fernando; Gastauer, Markus; Mota, Nayara Mesquita; Meira-Neto, João Augusto AlvesNurse plants reduce the environmental severity experienced by neighboring plants by providing shade, enabling nutrient accumulation or protection from herbivores within patches of vegetation. Nurse plants should preferentially promote the coexistence of ecologically dissimilar species with little niche overlap, and if ecological traits are conserved within evolutionary lineages, this should result in phylogenet...