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1

Winter activity of bats in Mediterranean peri-urban deciduous forests

100%
Barros P. A., Ribeiro C., Cabral J. A.
Acta Chiropterologica
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2017
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tom 19
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nr 2
Although the Vespertilionid bats typically hibernate during the winter to minimize energy expenditure in the cold months, in the temperate regions torpor breaks can be rather frequent. The aim of our study was to conduct a preliminary characterisation of the winter bat activity patterns in Mediterranean peri-urban deciduous forests of North Portugal. Echolocation calls were recorded between November and February, and bat activity was regularly detected on warm evenings, with sun set temperatures above 4.6°C during the night sampling, mostly in November (89.9%), only rarely in December (3.7%) and February (6.4%) and without activity detected in January. The most commonly recorded species were Pipistrellus pygmaeus, P. pipistrellus, and P. kuhlii. Socialization activity was mostly concentrated in November (96.8%), only with rare records in February (3.2%) and absent in December and January. Regarding the best fitting average model, obtained by the Multi-Model Inference (MMI) method to explaining the variation of bat passes, the main positive influencing factors are related with the night period of the monitoring process and temperature, and the negative influence with the precipitation recorded in the last 48 hours before surveys. The MMI results for the variation of social calls revealed as significant positive influences the humidity, temperature and wind speed and as negative influence the precipitation recorded in the last 48 hours before surveys. We outline our study as a promising baseline to the studies of winter bat activity, demonstrating how the present and past weather conditions can play a major role in bat torpor breaks. Therefore, for conservation purposes, further winter acoustic research efforts should be consider mandatory for full understanding the bat activity patterns facing the potential impacts of global climatic changes expected to occur in the Mediterranean region.
2

Aluminum-induced citric acid secretion is not the sole mechanism of Al-resistance in maize

76%
Cardoso F. B., Cambraia J., de Oliveira J. A., Ribeiro C., de Souza L. T., Braun H., DaMatta F. M.
Acta Physiologiae Plantarum
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2016
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tom 38
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nr 12
3

Impact of iron toxicity on oxidative metabolism in young Eugenia uniflora L. plants

76%
Jucoski G. d. O., Cambraia J., Ribeiro C., de Oliveira J. A., de Paula S. O., Oliva M. A.
Acta Physiologiae Plantarum
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2013
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tom 35
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nr 05
In excess, iron can induce the production and accumulation of reactive oxygen species (ROS), causing oxidative stress. The objective of this work was to evaluate the impact of toxic concentrations of iron (Fe) on the antioxidative metabolism of young Eugenia uniflora plants. Forty-five-day-old plants grown in Hoagland nutrient solution, pH 5.0, were treated with three Fe concentrations, in the form of FeEDTA, during three periods of time. At the end of the treatment, the plants were harvested and relative growth rate, iron content, lipid peroxidation and enzymes and metabolites of the antioxidative metabolism were determined. Iron-treated plants showed higher iron contents, reduced relative growth rates and iron toxicity symptoms in both leaves and roots. There was an increase in lipid peroxidation with increasing Fe, only in the leaves. The enzymatic activities of superoxide dismutase (SOD) and glutathione reductase (GR) increased with increasing Fe concentration and treatment exposure time. The activities of catalase (CAT), peroxidase (POX) and ascorbate peroxidase (APX) also increased with increasing Fe concentration but decreased with increasing treatment exposure time. Glutathione peroxidase activity (GPX) decreased with increasing Fe concentration and exposure time. The ascorbate (AA) and reduced glutathione (GSH) contents and the AA/DHA and GSH/GSSG ratios, in general, increased with increasing Fe concentration and treatment exposure time. The results indicate that under toxic levels of Fe, young E. uniflora plants suffer increased oxidative stress, which is ameliorated through changes in the activities of antioxidative enzymes and in the contents of the antioxidants AA and GSH.
4
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Redox state modulation in rice and its implications for plant development and stress responses

51%
Caverzan A., Ribeiro C., Lazzarotto F., Passaia G., Rosa S., Garighan J., Piovesana M., Carvalho F., Albenisio J., Margis R., Margis-Pinheiro M.
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
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2013
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tom 94
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nr 2
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