27 documents found, page 1 of 3
ADEQUATE EVALUATION TO THE CURRICULUM? WHAT THEY SAY THE CONTENTS REQUESTED IN ...
da Silva, Daisy; Vaz-Rebelo, Piedade; Canhoto, CristinaThe National Examinations have a great impact on the lives of students, parents and teachers in the educational process and educational policies. Analyzing the correspondence between the guiding principles of the biology discipline curriculum and the National Exam in Portugal and the National High School Examination (ENEM) in Brazil was the objective of this research. To achieve the intended goal, a documentary...
The role of carbon, nitrogen, and phosphorus in leaf decomposition mediated by ...
Abelho, Manuela; Canhoto, CristinaThe aquatic microbial decomposition of leaf litter has been the subject of many field studies throughout the world. However, field experiments cannot always separate the effects of the multiple biotic and abiotic factors involved in the process. In this laboratory experiment, we controlled the abiotic factors and the fungal decomposer community during decomposition of alder, oak and eucalypt leaf litter in orde...
Global patterns and drivers of ecosystem functioning in rivers and riparian zones
Tiegs, Scott D.; Costello, David M.; Isken, Mark W.; Woodward, Guy; McIntyre, Peter B.; Gessner, Mark O.; Chauvet, Eric; Canhoto, CristinaRiver ecosystems receive and process vast quantities of terrestrial organic carbon, the fate of which depends strongly on microbial activity. Variation in and controls of processing rates, however, are poorly characterized at the global scale. In response, we used a peer-sourced research network and a highly standardized carbon processing assay to conduct a global-scale field experiment in greater than 1000 riv...
Capítulo 12. Processos ecológicos e serviços
Ferreira, Verónica; Canhoto, Cristina; Pascoal, Cláudia; Graça, Manuel A. S.Os pequenos ribeiros de floresta constituem parte integrante da paisagem, estando representados em elevado número e ocupando uma posição de cabeceira nas bacias hidrográficas. Nestes ribeiros decorrem processos que podem afetar o balanço energético e o ciclo dos nutrientes a grandes escalas. Estes ribeiros, sendo ensombrados, obtêm da matéria orgânica (maioritariamente folhas produzidas pela floresta ripária) g...
Use of stable isotope ratios of fish larvae as indicators to assess diets and p...
Canhoto, CristinaA stable isotope study was carried out to investigate the feeding ecology of the common goby Pomatoschistus microps larvae (Krøyer, 1838), and to assess differences in the response of planktonic food web to nutrient enrichment, in two ecosystems from the Southern European coast with different levels of historical pollution (estuaries of the Minho and Lima Rivers). At each estuary and time (July 2012, November 2...
Response of biofilm growth to experimental warming in a temperate stream
Delgado, Cristina; Almeida, Salomé F. P.; Elias, Carmen L.; Ferreira, Verónica; Canhoto, CristinaBiofilm is an important component of small streams, and it is highly sensitive to variations in water temperature. Therefore, it is expectable that the warming predicted for this century will be reflected in its communities. In this study, we investigated the effects of experimental warming on biofilm growth in a small forest stream in Central Portugal. The stream was longitudinally divided in two halves, both ...
Seasonal Variability May Affect Microbial Decomposers and Leaf Decomposition Mo...
Duarte, Sofia; Cássio, Fernanda; Ferreira, Verónica; Canhoto, Cristina; Pascoal, CláudiaOngoing climate change is expected to affect the diversity and activity of aquatic microbes, which play a key role in plant litter decomposition in forest streams. We used a before-after control-impact (BACI) design to study the effects of warming on a forest stream reach. The stream reach was divided by a longitudinal barrier, and during 1 year (ambient year) both stream halves were at ambient temperature, whi...
Seasonal Variability May Affect Microbial Decomposers and Leaf Decomposition Mo...
Duarte, Sofia Alexandra Ferreira; Cássio, Fernanda; Ferreira, Verónica; Canhoto, Cristina; Pascoal, CláudiaOngoing climate change is expected to affect the diversity and activity of aquatic microbes, which play a key role in plant litter decomposition in forest streams. We used a before-after control-impact (BACI) design to study the effects of warming on a forest stream reach. The stream reach was divided by a longitudinal barrier, and during 1 year (ambient year) both stream halves were at ambient temperature, whi...
A conceptual model of litter breakdown in low order streams
Graça, Manuel A. S.; Ferreira, Verónica; Canhoto, Cristina; Encalada, Andrea C.; Guerrero-Bolaño, Francisco; Wantzen, Karl M.; Boyero, LuzThe detrital-based food web of many streams and rivers plays a fundamental role in the cycling and retention of carbon and nutrients. However, we still need to understand which global mechanisms underlie the biogeochemical pathways that control energy transfer from the detrital pool through local food webs into nutrient and energy cycles and storage. Previous attempts to understandthe variability in litter brea...
Effects of experimental warming, litter species, and presence of macroinvertebr...
Ferreira, Verónica; Chauvet, Eric; Canhoto, CristinaSmall woodland streams make the majority of water courses in most watersheds. Litter decomposition is a key ecosystem process in these shaded streams, and its response to warming can have profound consequences for food webs and the carbon (C) cycle. However, these responses can be modulated by litter identity and the structure of the detrital food web. Here we report on a manipulative study aiming at evaluating...