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  • 1
    Publication Date: 2013-06-01
    Description: Local extinctions have cascading effects on ecosystem functions, yet little is known about the potential for the rapid evolutionary change of species in human-modified scenarios. We show that the functional extinction of large-gape seed dispersers in the Brazilian Atlantic forest is associated with the consistent reduction of the seed size of a keystone palm species. Among 22 palm populations, areas deprived of large avian frugivores for several decades present smaller seeds than nondefaunated forests, with negative consequences for palm regeneration. Coalescence and phenotypic selection models indicate that seed size reduction most likely occurred within the past 100 years, associated with human-driven fragmentation. The fast-paced defaunation of large vertebrates is most likely causing unprecedented changes in the evolutionary trajectories and community composition of tropical forests.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Galetti, Mauro -- Guevara, Roger -- Cortes, Marina C -- Fadini, Rodrigo -- Von Matter, Sandro -- Leite, Abraao B -- Labecca, Fabio -- Ribeiro, Thiago -- Carvalho, Carolina S -- Collevatti, Rosane G -- Pires, Mathias M -- Guimaraes, Paulo R Jr -- Brancalion, Pedro H -- Ribeiro, Milton C -- Jordano, Pedro -- New York, N.Y. -- Science. 2013 May 31;340(6136):1086-90. doi: 10.1126/science.1233774.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Departamento de Ecologia, Universidade Estadual Paulista, Rio Claro, Sao Paulo, Brazil. mgaletti@rc.unesp.br〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23723235" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Arecaceae ; *Biological Evolution ; *Birds ; Brazil ; *Extinction, Biological ; *Feeding Behavior ; *Germination ; Seeds/*anatomy & histology/physiology ; Trees
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2018-08-30
    Description: Sensors, Vol. 18, Pages 2848: Monitoring Aquaculture Water Quality: Design of an Early Warning Sensor with Aliivibrio fischeri and Predictive Models Sensors doi: 10.3390/s18092848 Authors: Luís F. B. A. da Silva Zhaochu Yang Nuno M. M. Pires Tao Dong Hans-Christian Teien Trond Storebakken Brit Salbu A novel toxicity-warning sensor for water quality monitoring in recirculating aquaculture systems (RAS) is presented. The design of the sensor system mainly comprises a whole-cell biosensor. Aliivibrio fischeri, a luminescent bacterium widely used in toxicity analysis, was tested for a mixture of known fish-health stressors, namely nitrite, un-ionized ammonia, copper, aluminum and zinc. Two toxicity predictive models were constructed. Correlation, root mean squared error, relative error and toxic behavior were analyzed. The linear concentration addition (LCA) model was found suitable to ally with a machine learning algorithm for prediction of toxic events, thanks to additive behavior near the limit concentrations for these stressors, with a root-mean-squared error (RMSE) of 0.0623, and a mean absolute error of 4%. The model was proved to have a smaller relative deviation than other methods described in the literature. Moreover, the design of a novel microfluidic chip for toxicity testing is also proposed, which is to be integrated in a fluidic system that functions as a bypass of the RAS tank to enable near-real time monitoring. This chip was tested with simulated samples of RAS water spiked with zinc, with an EC50 of 6,46E-7 M. Future work will be extended to the analysis of other stressors with the novel chip.
    Electronic ISSN: 1424-8220
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Published by MDPI Publishing
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