14 documents found, page 1 of 2
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...
Leaf litter quality drives the feeding by invertebrate shredders in tropical st...
Sena, Guilherme; Gonçalves Júnior, José Francisco; Martins, Renato Tavares; Hamada, Neusa; Rezende, Renan de SouzaAmazon and Cerrado-forested streams show natural fluctuations in leaf litter quantity along the time and space, suggesting a change on litter quality input. These natural fluctuations of leaf litter have repercussion on the organic matter cycling and consequently effects on leaf decomposition in forested streams. The effects of the quantity of leaf litter with contrasting traits on consumption by larvae of shre...
A comparative analysis reveals weak relationships between ecological factors an...
Heino, Jani; Melo, Adriano Sanches; Bini, Luis Mauricio; Altermatt, Florian; Al-Shami, Salman Abdo; Angeler, David G.; Bonada, Núria; Brand, CeciliaThe hypotheses that beta diversity should increase with decreasing latitude and increase with spatial extent of a region have rarely been tested based on a comparative analysis of multiple datasets, and no such study has focused on stream insects. We first assessed how well variability in beta diversity of stream insect metacommunities is predicted by insect group, latitude, spatial extent, altitudinal range, a...
Small forest losses degrade stream macroinvertebrate assemblages in the eastern...
Brito, Janaina G.; Roque, Fabio O.; Martins, Renato Tavares; Nessimian, Jorge; Oliveira, Vívian Campos de; Hughes, Robert MasonGenerally, habitat loss and fragmentation negatively affect biota, often in nonlinear ways. Such nonlinear responses suggest the existence of critical limits for habitat loss beyond which taxa experience substantial changes. Therefore, we identified change points for aquatic macroinvertebrate assemblages at both local-riparian and catchment extents in response to a forest-loss gradient in agriculture-altered la...
Biomass estimation of Triplectides egleri Sattler (Trichoptera, Leptoceridae) i...
Brito, Janaína Gomes de; Martins, Renato Tavares; Soares, Kleicy Maciel; Hamada, NeusaBiomass is a fundamental measure for understanding the structure and functioning (e.g. fluxes of energy and nutrients in the food chain) of aquatic ecosystems. We aim to provide predictive models to estimate the biomass of Triplectides egleri Sattler, 1963, in a stream in Central Amazonia, based on body and case dimensions. We used body length, head-capsule width, interocular distance and case length and width ...
Estimation of dry mass of caddisflies Phylloicus elektoros (Trichoptera: Calamo...
Martins, Renato Tavares; Melo, Adriano Sanches; Gonçalves, José Francisco Júnior; Hamada, NeusaAquatic invertebrate biomass estimations are often important in ecological and biological studies. Biomass may be determined by regression models between body and case dimensions and dry mass. Using linear, exponential and power regressions we analyzed the relationship between body and case dimensions and the biomass of Phylloicus elektoros Prather, 2003. Furthermore, we used cross-validation to evaluate the pr...
Plant litter dynamics in the forest-stream interface: Precipitation is a major ...
Tonin, Alan Mosele; Gonçalves, José Francisco Júnior; Bambi, Paulino; Couceiro, Sheyla R.M.; Feitoza, Lorrane A.M.; Fontana, Lucas EugênioRiparian plant litter is a major energy source for forested streams across the world and its decomposition has repercussions on nutrient cycling, food webs and ecosystem functioning. However, we know little about plant litter dynamics in tropical streams, even though the tropics occupy 40% of the Earth's land surface. Here we investigated spatial and temporal (along a year cycle) patterns of litter inputs and s...
Colonization by oligochaetes (Annelida: Clitellata) in decomposing leaves of Ei...
Martins, Renato Tavares; Silveira, L. S.; Alves, R. G.The objective of the present study was to examine the colonization of oligochaetes during the decomposition of leaves of the macrophyte Eichhornia azurea in a lentic system in southeastern Brazil. The experiment was conducted between September and November 2007, with the use of 21 nylon bags measuring 15×15 cm with 2 mm mesh, each containing 10 g of dried leaves. The bags were removed from the lake after 2, 5, ...
Effects of increasing temperature and, CO2 on quality of litter, shredders, and...
Martins, Renato Tavares; Rezende, Renan S.; Gonçalves, José Francisco Júnior; Lopes, Aline; Piedade, Maria Teresa Fernandez; Cavalcante, Heloide de LimaClimate change may affect the chemical composition of riparian leaf litter and, aquatic organisms and, consequently, leaf breakdown. We evaluated the effects of different scenarios combining increased temperature and carbon dioxide (CO2) on leaf detritus of Hevea spruceana (Benth) Müll. and decomposers (insect shredders and microorganisms). We hypothesized that simulated climate change (warming and elevated CO2...
Distribution of oligochaetes in a stream in the Atlantic Forest in southeastern...
Rosa, Beatriz Figueiraujo Jabour Vescovi; Martins, Renato Tavares; Alves, R. G.The oligochaetes are considered good indicators of ecological conditions and specific types of habitats. Among the factors that influence the distribution of these invertebrates are the water flow and the nature of the substrate. The aim of this study is to describe the composition and distribution of oligochaete species in a first-order stream in Atlantic Forest and try to identify if some species are associat...