Publicaciones | de la Barrera Lab

Díaz-Álvarez, E A; de la Barrera, E

PREPRINT: Mapping pollution in a megalopolis: the case for atmospheric biomonitors of nitrogen deposition Journal Article

BioRxiv, doi: 10.1101/118257 , 2017, (This article is a preprint and has not been peer reviewed. ).

Abstract | Links | BibTeX | Tags: biomonitoring, ecophysiology, global change, lichen, megacities, mosses, nitrogen, Tillandsia, urban ecology

@article{Díaz-Álvarez2017b,
title = {PREPRINT: Mapping pollution in a megalopolis: the case for atmospheric biomonitors of nitrogen deposition},
author = {E. A. Díaz-Álvarez and E. de la Barrera },
url = {https://doi.org/10.1101/118257
},
doi = {10.1101/118257},
year = {2017},
date = {2017-03-19},
journal = {BioRxiv},
volume = {doi: 10.1101/118257},
abstract = {An increase of nitrogen deposition resulting from human activities is not only a major threat for global biodiversity, but also for human health, especially in highly populated regions. It is thus important and in some instances legally mandated to monitor reactive nitrogen species in the atmosphere. However, deployment of automated networks can be excessively costly for most cities so the utilization of widely distributed biological species suitable for biomonitoring may be a good alternative. The aim of this work was thus to assess the suitability of different atmospheric organisms as biomonitors of nitrogen deposition, by means of an extensive sampling of a lichen, two mosses, and one bromeliad throughout the Valley of Mexico, the basin where the megalopolis of Mexico City (population 20 million) is located, and subsequent measurements of nitrogen metabolism parameters. In all cases significant responses of nitrogen content, C:N ratio and 15N were found for the lichen Anaptychia sp. the mosses Grimmia sp. and Fabronia sp., and the bromeliad Tillandsia recurvata in response to season and collected site. In turn, 15N for the mosses responded linearly to the wet deposition (R2= 0.7 for Grimmia sp. and R2=0.2 for Fabronia sp.). Also, the nitrogen content (R2=0.7), the C:N ratio (R2=0.6), and 15N (R2=0.5) for the bromeliad had a linear response to NOx. However, latter species was not found in sites with NOx concentrations above 212 ppm. These biomonitors can be utilized in tandem to determine the status of nitrogenous pollution in regions without monitoring networks.},
note = {This article is a preprint and has not been peer reviewed. },
keywords = {biomonitoring, ecophysiology, global change, lichen, megacities, mosses, nitrogen, Tillandsia, urban ecology},
pubstate = {published},
tppubtype = {article}
}

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Villa-Reyes, F; de la Barrera, E

Environmental cues for germination of the invasive bunch grass Pennisetum ciliare (L.) Link Journal Article

Acta Physiologiae Plantarum, 38 , pp. 156, 2016.

Abstract | Links | BibTeX | Tags: buffel grass, Cenchrus ciliaris, ecophysiology, germination, global change, invasive species, Pennisetum ciliare, zacate buffel

@article{Villa-Reyes2016,
title = {Environmental cues for germination of the invasive bunch grass Pennisetum ciliare (L.) Link},
author = {F. Villa-Reyes and E. de la Barrera},
url = {http://rdcu.be/noeu

http://link.springer.com/article/10.1007/s11738-016-2175-x},
doi = {10.1007/s11738-016-2175-x},
year = {2016},
date = {2016-05-28},
journal = {Acta Physiologiae Plantarum},
volume = {38},
pages = {156},
abstract = {Responses of seed germination to air temperature, water potential, light, and smoke were studied in the laboratory for seeds of the invasive bunch grass Pennisetum ciliare (L.) Link (syn. Cenchrus ciliare L.; buffel grass). First introduced to North America during the mid-20th Century for establishing pastures, this African bunch grass has become an invasive species of concern. Across all the experiments conducted, a low germination was observed for P. ciliare fascicles that never exceeded 30% at 21 days after sowing. Optimal day/night air temperatures for germination, controlled with an environmental chamber, were 25/15 and 30/20 ºC, while extreme temperatures of 15/5 and 45/35 ºC inhibited germination. By sowing seeds of P. ciliare under different water potentials, created with aqueous solutions of polyethylene glycol, an optimum of -0.03 MPa led to the highest germination, while no germination was observed at -1.0 MPa. Monochromatic optical filters were utilized to germinate seeds under various wavelengths, of which red (650 nm) and far red (730 nm) led to the highest germination. In addition, seeds that were incubated in the dark had higher germination than those incubated under white light. Incubation in smoke water, which can stimulate germination of phyrophytic species, resulted in a marginal inhibition of germination compared with imbibition with distilled water.},
keywords = {buffel grass, Cenchrus ciliaris, ecophysiology, germination, global change, invasive species, Pennisetum ciliare, zacate buffel},
pubstate = {published},
tppubtype = {article}
}

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Guerrero-Jiménez, Z D; de la Barrera, E

Short-term drought responses by seedlings of three maizes along an environmental gradient in Michoacán, Mexico Journal Article

Maydica, 60 (2), pp. M017, 2015.

Links | BibTeX | Tags: climate change, drought, ecophysiology, food security, maize