acclimation agriculture biophysics cactus CAM climate change CO2 cultivation drought ecophysiology epiphytes food security fruit germination global change Hylocereus invasive species nectar nitrogen opuntia orchid photosynthesis pollution reproductive ecophysiology seed stable isotopes temperature tropical forest urban ecology water
2019 |
Díaz-Álvarez, E A; Felix, J D; de la Barrera, E Elemental and isotopic assessment for Colombian orchids from a montane cloud forest: a baseline for global environmental change Journal Article Acta Physiologiae Plantarum, 41 (6), pp. 99, 2019. Abstract | Links | BibTeX | Tags: biodiversity, CAM, ecophysiology, epiphytes, global change, nitrogen, orchid, photosynthesis, stable isotopes @article{Díaz-Álvarez2019, title = {Elemental and isotopic assessment for Colombian orchids from a montane cloud forest: a baseline for global environmental change}, author = {E. A. Díaz-Álvarez and J. D. Felix and E. de la Barrera}, url = {https://rdcu.be/bCRG6}, doi = {10.1007/s11738-019-2893-y}, year = {2019}, date = {2019-05-16}, journal = {Acta Physiologiae Plantarum}, volume = {41}, number = {6}, pages = {99}, abstract = {Orchidaceae is the largest family of plants, reaching its maximum diversity in Colombia where 4000 species have been registered. One particular ecosystem with high diversity of orchids is the tropical montane cloud forest characterized by high humidity and low air temperatures. However, due to anthropic pressure such as land use change its area has been reduced. This is not the only anthropic disturbance that can affect the continuity of this forest and orchids, climate change and nitrogen deposition also become threats. By means of elemental composition and isotopic measurements of carbon and nitrogen, we determined the photosynthetic pathway for orchids from a tropical cloud forest in Colombia, for which, we also evaluated the nutritional status of nitrogen and its relationship with atmospheric deposition. We found 46 species from 18 genera; of these, 19 species were epiphytic, 9 lithophytic and 18 terrestrials. The carbon content was not significantly different among the species evaluated, averaging 46.4 ± 0.41% (dry weight). In turn, only one terrestrial orchid had a nitrogen content above 2.2%, averaged 1.4 ± 0.07% for the remaining 45 species. The δ13C that averaged − 28.1 ± 0.4‰ for 45 species was typical of C3 plants, while only one species, whose δ13C of 18.8‰ can be considered CAM. The δ15N values for 44 orchids were negative, in total they ranged from − 8.1 to 4.5‰. It can be concluded that the temperatures in this area are not yet high enough to produce a noticeable change in photosynthesis as evidenced by the carbon content of orchids, however, the expected rise would bring harmful consequences for these populations of orchids, especially when considering that these orchids were collected at the highest altitudinal range of the region. Moreover, the rates of nitrogen deposition are not high enough yet to leave a significant signal in the vegetation.}, keywords = {biodiversity, CAM, ecophysiology, epiphytes, global change, nitrogen, orchid, photosynthesis, stable isotopes}, pubstate = {published}, tppubtype = {article} } Orchidaceae is the largest family of plants, reaching its maximum diversity in Colombia where 4000 species have been registered. One particular ecosystem with high diversity of orchids is the tropical montane cloud forest characterized by high humidity and low air temperatures. However, due to anthropic pressure such as land use change its area has been reduced. This is not the only anthropic disturbance that can affect the continuity of this forest and orchids, climate change and nitrogen deposition also become threats. By means of elemental composition and isotopic measurements of carbon and nitrogen, we determined the photosynthetic pathway for orchids from a tropical cloud forest in Colombia, for which, we also evaluated the nutritional status of nitrogen and its relationship with atmospheric deposition. We found 46 species from 18 genera; of these, 19 species were epiphytic, 9 lithophytic and 18 terrestrials. The carbon content was not significantly different among the species evaluated, averaging 46.4 ± 0.41% (dry weight). In turn, only one terrestrial orchid had a nitrogen content above 2.2%, averaged 1.4 ± 0.07% for the remaining 45 species. The δ13C that averaged − 28.1 ± 0.4‰ for 45 species was typical of C3 plants, while only one species, whose δ13C of 18.8‰ can be considered CAM. The δ15N values for 44 orchids were negative, in total they ranged from − 8.1 to 4.5‰. It can be concluded that the temperatures in this area are not yet high enough to produce a noticeable change in photosynthesis as evidenced by the carbon content of orchids, however, the expected rise would bring harmful consequences for these populations of orchids, especially when considering that these orchids were collected at the highest altitudinal range of the region. Moreover, the rates of nitrogen deposition are not high enough yet to leave a significant signal in the vegetation. |
2018 |
Díaz-Álvarez, E A; de la Barrera, E Characterization of nitrogen deposition in a megalopolis by means of atmospheric biomonitors Journal Article Scientific Reports, 8 , pp. 13569, 2018. Abstract | Links | BibTeX | Tags: biomonitors, epiphytes, Mexico, mosses, nitrogen, pollution, stable isotopes, Tillandsia, urban ecology @article{Díaz-Álvarez2018b, title = {Characterization of nitrogen deposition in a megalopolis by means of atmospheric biomonitors}, author = {E. A. Díaz-Álvarez and E. de la Barrera }, url = {https://rdcu.be/6jWU}, doi = {10.1038/s41598-018-32000-5}, year = {2018}, date = {2018-09-11}, journal = {Scientific Reports}, volume = {8}, pages = {13569}, 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. The utilization of widely distributed biological species suitable for biomonitoring may be a good alternative. We assessed the suitability of an ensemble of atmospheric biomonitors of nitrogen deposition by means of an extensive sampling of a lichen, two mosses, and a bromeliad throughout the Valley of Mexico, whose population reaches 30 million, and subsequent measurements of nitrogen metabolism parameters. In all cases we found significant responses of nitrogen content, C:N ratio and the δ15N to season and site. In turn, the δ15N for the mosses responded linearly to the wet deposition. Also, the nitrogen content (R2 = 0.7), the C:N ratio (R2 = 0.6), and δ15N (R2 = 0.5) for the bromeliad had a linear response to NOx. However, the bromeliad was not found in sites with NOx concentrations exceeding 80 ppb, apparently of as a consequence of exceeding nitrogen. These biomonitors can be utilized in tandem to determine the status of atmospheric nitrogenous pollution in regions without monitoring networks for avoiding health problems for ecosystems and humans.}, keywords = {biomonitors, epiphytes, Mexico, mosses, nitrogen, pollution, stable isotopes, Tillandsia, urban ecology}, pubstate = {published}, tppubtype = {article} } 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. The utilization of widely distributed biological species suitable for biomonitoring may be a good alternative. We assessed the suitability of an ensemble of atmospheric biomonitors of nitrogen deposition by means of an extensive sampling of a lichen, two mosses, and a bromeliad throughout the Valley of Mexico, whose population reaches 30 million, and subsequent measurements of nitrogen metabolism parameters. In all cases we found significant responses of nitrogen content, C:N ratio and the δ15N to season and site. In turn, the δ15N for the mosses responded linearly to the wet deposition. Also, the nitrogen content (R2 = 0.7), the C:N ratio (R2 = 0.6), and δ15N (R2 = 0.5) for the bromeliad had a linear response to NOx. However, the bromeliad was not found in sites with NOx concentrations exceeding 80 ppb, apparently of as a consequence of exceeding nitrogen. These biomonitors can be utilized in tandem to determine the status of atmospheric nitrogenous pollution in regions without monitoring networks for avoiding health problems for ecosystems and humans. |
Díaz-Álvarez, E A; Lindig-Cisneros, R; de la Barrera, E Biomonitors of atmospheric nitrogen deposition: potential uses and limitations Journal Article Conservation Physiology, 6 , pp. coy011, 2018. Abstract | Links | BibTeX | Tags: biomonitors, ecosystem saturation, epiphytes, nitrogen, pollution, stable isotopes, urban ecology @article{Díaz-Álvarez2018, title = {Biomonitors of atmospheric nitrogen deposition: potential uses and limitations}, author = {E. A. Díaz-Álvarez and R. Lindig-Cisneros and E. de la Barrera }, doi = {10.1093/conphys/coy011}, year = {2018}, date = {2018-03-13}, journal = {Conservation Physiology}, volume = {6}, pages = {coy011}, abstract = {Atmospheric nitrogen deposition is the third largest cause of global biodiversity loss, with rates that have more than doubled over the past century. This is especially threatening for tropical regions where the deposition may soon exceed 25 kg of N ha–1 year–1, well above the threshold for physiological damage of 12-20 kg of N ha–1 year–1, depending on plant species and nitrogenous compound. It is thus urgent to monitor these regions where the most diverse biotas occur. However, most studies have been conducted in Europe, the USA, and recently in China. This review presents the case for the potential use of biological organisms to monitor nitrogen deposition, with emphasis on tropical plants. We first present an overview of atmospheric chemistry and the nitrogen metabolism of potential biomonitors, followed by a framework for monitoring nitrogen deposition based on the simultaneous use of various functional groups. In particular, the tissue nitrogen content responds to the rate of deposition, especially for mosses, whose nitrogen content increases by 1% per kilogram of N ha-1 year-1. The isotopic signature, δ15N, is a useful indicator of the nitrogen source, as the slightly negative values (e.g., 5‰) of plants from natural environments can become very negative (–11.2‰) in sites with agricultural and husbandry activities, but very positive (13.3‰) in urban environments with high vehicular activity. Mosses are good biomonitors for wet deposition and atmospheric epiphytes for dry deposition. In turn, the nitrogen saturation of ecosystems can be monitored with trees whose isotopic values increase with saturation. Although given ecophysiological limitations of different organisms, particular studies should be conducted in each area of interest to determine the most suitable biomonitors. Overall, biomonitors can provide an integrative approach for characterizing nitrogen deposition in regions where the deployment of automated instruments or passive monitoring is not feasible or can be complementary. }, keywords = {biomonitors, ecosystem saturation, epiphytes, nitrogen, pollution, stable isotopes, urban ecology}, pubstate = {published}, tppubtype = {article} } Atmospheric nitrogen deposition is the third largest cause of global biodiversity loss, with rates that have more than doubled over the past century. This is especially threatening for tropical regions where the deposition may soon exceed 25 kg of N ha–1 year–1, well above the threshold for physiological damage of 12-20 kg of N ha–1 year–1, depending on plant species and nitrogenous compound. It is thus urgent to monitor these regions where the most diverse biotas occur. However, most studies have been conducted in Europe, the USA, and recently in China. This review presents the case for the potential use of biological organisms to monitor nitrogen deposition, with emphasis on tropical plants. We first present an overview of atmospheric chemistry and the nitrogen metabolism of potential biomonitors, followed by a framework for monitoring nitrogen deposition based on the simultaneous use of various functional groups. In particular, the tissue nitrogen content responds to the rate of deposition, especially for mosses, whose nitrogen content increases by 1% per kilogram of N ha-1 year-1. The isotopic signature, δ15N, is a useful indicator of the nitrogen source, as the slightly negative values (e.g., 5‰) of plants from natural environments can become very negative (–11.2‰) in sites with agricultural and husbandry activities, but very positive (13.3‰) in urban environments with high vehicular activity. Mosses are good biomonitors for wet deposition and atmospheric epiphytes for dry deposition. In turn, the nitrogen saturation of ecosystems can be monitored with trees whose isotopic values increase with saturation. Although given ecophysiological limitations of different organisms, particular studies should be conducted in each area of interest to determine the most suitable biomonitors. Overall, biomonitors can provide an integrative approach for characterizing nitrogen deposition in regions where the deployment of automated instruments or passive monitoring is not feasible or can be complementary. |
2017 |
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} } 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. |
2016 |
Díaz-Álvarez, E A ¿Qué tanto es tantito? Una breve historia del nitrógeno en la era industrial Online Morelia, UNAM Campus (Ed.): 2016. Links | BibTeX | Tags: ecophysiology, nitrogen, pollution, urban ecology @online{Díaz-Álvarez2016, title = {¿Qué tanto es tantito? Una breve historia del nitrógeno en la era industrial}, author = {E. A. Díaz-Álvarez}, editor = {UNAM Campus Morelia}, url = {http://agro.mx/wp-content/uploads/2017/08/diazalvarez-2016-BUM.pdf}, year = {2016}, date = {2016-12-31}, journal = {Boletín UNAM Morelia (BUM)}, volume = {64}, keywords = {ecophysiology, nitrogen, pollution, urban ecology}, pubstate = {published}, tppubtype = {online} } |
Díaz-Álvarez, E A; Reyes-García, C; de la Barrera, E A δ15N assessment of nitrogen deposition for the endangered epiphytic orchid Laelia speciosa from a city and an oak forest in Mexico Journal Article Journal of Plant Research, 129 , pp. 863–872, 2016. Abstract | Links | BibTeX | Tags: conservation physiology, global change, moss, Neo-volcanic axis, nitrogen, orchid, pollution, stable isotopes, urban ecology @article{Díaz-Álvarez2016b, title = {A δ15N assessment of nitrogen deposition for the endangered epiphytic orchid Laelia speciosa from a city and an oak forest in Mexico}, author = {E. A. Díaz-Álvarez and C. Reyes-García and E. de la Barrera }, url = {http://rdcu.be/npd1 http://agro.mx/wp-content/uploads/2016/06/039-Diaz-Alvarez-laelia-rv3.pdf http://link.springer.com/article/10.1007/s10265-016-0843-y}, doi = {10.1007/s10265-016-0843-y}, year = {2016}, date = {2016-06-09}, journal = {Journal of Plant Research}, volume = {129}, pages = {863–872}, abstract = {Atmospheric nitrogen deposition poses a major threat to global biodiversity. Tropical epiphytic plants are especially at risk given their reliance on atmospheric sources of nutrients. The leaf, pseudobulb, and root carbon and nitrogen content, C:N ratio, as well as the nitrogen isotopic composition were studied for individuals of Laelia speciosa from a city and from an oak forest in Mexico. The nitrogen content of leaves was similar between the city and the oak forest, reaching 1.3 ± 0.2 % (dry mass). The δ15N of leaves, pseudobulbs, and roots reached 5.6 ± 0.2 ‰ in the city, values found in sites exposed to industrial and vehicular activities. The δ15N for plant from the oak forest amounted to –3.1 ± 0.3 ‰, which is similar to values measured from sites with low industrial activities. Some orchids such as Laelia speciosa produce a single pseudobulb per year, i.e., a water and nutrient storage organ, so the interannual nitrogen deposition was studied by considering the ten most recent pseudobulbs for plants from either site formed between 2003 and 2012. The C:N ratio of the ten most recent pseudobulbs from the oak forest, as well as that of the pseudobulbs formed before 2010 for plants in the city were indistinguishable from each other, averaging 132.4 ± 6.5, while it was lower for the two most recent pseudobulbs in the city. The δ15N values of pseudobulbs from the oak forest averaged ‒4.4 ± 0.1 ‰ for the entire series. The δ15N ranged from 0.1 ± 1.6 ‰ for the oldest pseudobulb to 4.7 ± 0.2 ‰ for the pseudobulb formed in the city from 2008 onwards. Isotopic analysis and the C:N ratio for L. speciosa revealed that rates of nitrogen deposition were higher in the city than in the forest. The δ15N values of series of pseudobulbs showed that it is possible to track nitrogen deposition over multiple years.}, keywords = {conservation physiology, global change, moss, Neo-volcanic axis, nitrogen, orchid, pollution, stable isotopes, urban ecology}, pubstate = {published}, tppubtype = {article} } Atmospheric nitrogen deposition poses a major threat to global biodiversity. Tropical epiphytic plants are especially at risk given their reliance on atmospheric sources of nutrients. The leaf, pseudobulb, and root carbon and nitrogen content, C:N ratio, as well as the nitrogen isotopic composition were studied for individuals of Laelia speciosa from a city and from an oak forest in Mexico. The nitrogen content of leaves was similar between the city and the oak forest, reaching 1.3 ± 0.2 % (dry mass). The δ15N of leaves, pseudobulbs, and roots reached 5.6 ± 0.2 ‰ in the city, values found in sites exposed to industrial and vehicular activities. The δ15N for plant from the oak forest amounted to –3.1 ± 0.3 ‰, which is similar to values measured from sites with low industrial activities. Some orchids such as Laelia speciosa produce a single pseudobulb per year, i.e., a water and nutrient storage organ, so the interannual nitrogen deposition was studied by considering the ten most recent pseudobulbs for plants from either site formed between 2003 and 2012. The C:N ratio of the ten most recent pseudobulbs from the oak forest, as well as that of the pseudobulbs formed before 2010 for plants in the city were indistinguishable from each other, averaging 132.4 ± 6.5, while it was lower for the two most recent pseudobulbs in the city. The δ15N values of pseudobulbs from the oak forest averaged ‒4.4 ± 0.1 ‰ for the entire series. The δ15N ranged from 0.1 ± 1.6 ‰ for the oldest pseudobulb to 4.7 ± 0.2 ‰ for the pseudobulb formed in the city from 2008 onwards. Isotopic analysis and the C:N ratio for L. speciosa revealed that rates of nitrogen deposition were higher in the city than in the forest. The δ15N values of series of pseudobulbs showed that it is possible to track nitrogen deposition over multiple years. |
2015 |
Montejo-Mayo, W; del-Val, E; Gómez-Romero, M; de la Barrera, E; Lindig-Cisneros, R Interactions between dominant hydrophytic species of the wetlands of western Mexico mediated by fire and nitrite concentration Journal Article Polibotánica, 40 , pp. 53-161, 2015. Links | BibTeX | Tags: fire, nitrogen, Typha, wetland @article{Montejo-Mayo2015, title = {Interactions between dominant hydrophytic species of the wetlands of western Mexico mediated by fire and nitrite concentration}, author = {W. Montejo-Mayo and E. del-Val and M. Gómez-Romero and E. de la Barrera and R. Lindig-Cisneros}, url = {http://agro.mx/wp-content/uploads/2015/10/MontejoetalPolibotanica.pdf http://www.polibotanica.mx/esp/num40/tema10esp.htm }, year = {2015}, date = {2015-09-29}, journal = {Polibotánica}, volume = {40}, pages = {53-161}, keywords = {fire, nitrogen, Typha, wetland}, pubstate = {published}, tppubtype = {article} } |
Báez-Pérez, A L; Gómez-Romero, M; Villegas, J; de la Barrera, E; Carreto-Montoya, L; Lindig-Cisneros, R Inoculación con hongos micorrízicos y fertilización con urea de plantas de Fraxinus uhdei en acrisoles provenientes de sitios degradados Journal Article Botanical Sciences, 93 (3), pp. 501-508, 2015. Links | BibTeX | Tags: erosion, Fraxinus, micorrhizae, nitrogen, Pisolitus, restoration, Rhizophagus @article{Báez-Pérez2015, title = {Inoculación con hongos micorrízicos y fertilización con urea de plantas de Fraxinus uhdei en acrisoles provenientes de sitios degradados}, author = {A. L. Báez-Pérez and M. Gómez-Romero and J. Villegas and E. de la Barrera and L. Carreto-Montoya and R. Lindig-Cisneros}, url = {http://agro.mx/wp-content/uploads/2015/09/032-Baez-Pérez-2015-BotSci-micorrizas.pdf http://www.botanicalsciences.com.mx/index.php/botanicalSciences/article/view/207/pdf_138 }, doi = {10.17129/botsci.207}, year = {2015}, date = {2015-09-15}, journal = {Botanical Sciences}, volume = {93}, number = {3}, pages = {501-508}, keywords = {erosion, Fraxinus, micorrhizae, nitrogen, Pisolitus, restoration, Rhizophagus}, pubstate = {published}, tppubtype = {article} } |
Díaz-Álvarez, E A; Lindig-Cisneros, R; de la Barrera, E Responses to simulated nitrogen deposition by the neotropical epiphytic orchid Laelia speciosa Journal Article PeerJ, 3 , pp. e1021, 2015. Abstract | Links | BibTeX | Tags: acid rain, biodiversity, CAM, conservation physiology, d15N, global change, Laelia, neotropical, nitrogen, orchid, plant nutrition, pollution, stable isotopes @article{Díaz-Álvarez2015, title = {Responses to simulated nitrogen deposition by the neotropical epiphytic orchid Laelia speciosa}, author = {E. A. Díaz-Álvarez and R. Lindig-Cisneros and E. de la Barrera}, url = {https://peerj.com/articles/1021/ http://agro.mx/wp-content/uploads/2015/06/031-Díaz-Alvarez-et-al-2015-PeerJ-Laelia.pdf}, doi = {10.7717/peerj.1021}, year = {2015}, date = {2015-06-18}, journal = {PeerJ}, volume = {3}, pages = {e1021}, abstract = {Potential ecophysiological responses to nitrogen deposition, which is considered to be one of the leading causes for global biodiversity loss, were studied for the endangered endemic Mexican epiphytic orchid, Laelia speciosa, via a shadehouse dose-response experiment (doses were 2.5, 5, 10, 20, 40, and 80 kg N ha-1 yr-1) in order to assess the potential risk facing this orchid given impending scenarios of nitrogen deposition. Lower doses of nitrogen of up to 20 kg N ha yr–1, the dose that led to optimal plant performance, acted as fertilizer. For instance, the production of leaves and pseudobulbs were respectively 35% and 36% greater for plants receiving 20 kg N ha yr–1 than under any other dose. Also, the chlorophyll content and quantum yield peaked at 0.66 ± 0.03 g m-2 and 0.85 ± 0.01, respectively, for plants growing under the optimum dose. In contrast, toxic effects were observed at the higher doses of 40 and 80 kg N ha yr–1. The δ13C for leaves averaged –14.7 ± 0.2‰ regardless of the nitrogen dose. In turn, δ15N decreased as the nitrogen dose increased from 0.9 ±0.1‰ under 2.5 kg N ha-1 yr-1 to – 3.1 ± 0.2 ‰ under 80 kg N ha-1 yr-1, indicating that orchids preferentially assimilate NH4+ rather than NO3– of the solution under higher doses of nitrogen. Laelia speciosa showed a clear response to inputs of nitrogen, thus, increasing rates of atmospheric nitrogen deposition can pose an important threat for this species.}, keywords = {acid rain, biodiversity, CAM, conservation physiology, d15N, global change, Laelia, neotropical, nitrogen, orchid, plant nutrition, pollution, stable isotopes}, pubstate = {published}, tppubtype = {article} } Potential ecophysiological responses to nitrogen deposition, which is considered to be one of the leading causes for global biodiversity loss, were studied for the endangered endemic Mexican epiphytic orchid, Laelia speciosa, via a shadehouse dose-response experiment (doses were 2.5, 5, 10, 20, 40, and 80 kg N ha-1 yr-1) in order to assess the potential risk facing this orchid given impending scenarios of nitrogen deposition. Lower doses of nitrogen of up to 20 kg N ha yr–1, the dose that led to optimal plant performance, acted as fertilizer. For instance, the production of leaves and pseudobulbs were respectively 35% and 36% greater for plants receiving 20 kg N ha yr–1 than under any other dose. Also, the chlorophyll content and quantum yield peaked at 0.66 ± 0.03 g m-2 and 0.85 ± 0.01, respectively, for plants growing under the optimum dose. In contrast, toxic effects were observed at the higher doses of 40 and 80 kg N ha yr–1. The δ13C for leaves averaged –14.7 ± 0.2‰ regardless of the nitrogen dose. In turn, δ15N decreased as the nitrogen dose increased from 0.9 ±0.1‰ under 2.5 kg N ha-1 yr-1 to – 3.1 ± 0.2 ‰ under 80 kg N ha-1 yr-1, indicating that orchids preferentially assimilate NH4+ rather than NO3– of the solution under higher doses of nitrogen. Laelia speciosa showed a clear response to inputs of nitrogen, thus, increasing rates of atmospheric nitrogen deposition can pose an important threat for this species. |
2014 |
Díaz-Álvarez, E A; Lindig-Cisneros, R; Reyes-García, C; de la Barrera, E PREPRINT: Effects of simulated nitrogen deposition and a stable isotopic assessment for the neotropical epiphytic orchid Laelia speciosa Journal Article PeerJ Preprints, 2 , pp. e771v1, 2014, ( NOT PEER-REVIEWED. This is a rapid communication before peer review.). Links | BibTeX | Tags: CAM, epiphyte, global change, nitrogen, orchid, preprint @article{Díaz-Álvarez2014, title = {PREPRINT: Effects of simulated nitrogen deposition and a stable isotopic assessment for the neotropical epiphytic orchid Laelia speciosa}, author = {E. A. Díaz-Álvarez and R. Lindig-Cisneros and C. Reyes-García and E. de la Barrera}, url = {https://peerj.com/preprints/771/}, doi = {10.7287/peerj.preprints.771v1}, year = {2014}, date = {2014-12-31}, journal = {PeerJ Preprints}, volume = {2}, pages = {e771v1}, note = { NOT PEER-REVIEWED. This is a rapid communication before peer review.}, keywords = {CAM, epiphyte, global change, nitrogen, orchid, preprint}, pubstate = {published}, tppubtype = {article} } |
2013 |
Gómez-Romero, M; de la Barrera, E; Villegas, J; Lindig-Cisneros, R Fertilización y asociación con especies pioneras herbáceas en el crecimiento de Pinus pseudostrobus Journal Article Phyton, 82 , pp. 135-143, 2013. Links | BibTeX | Tags: erosion, Lupinus, nitrogen, phosphorus, Pinus, pioneer, restoration ecology, temperate forests, understory @article{Gómez-Romero2013, title = {Fertilización y asociación con especies pioneras herbáceas en el crecimiento de Pinus pseudostrobus}, author = {M. Gómez-Romero and E. de la Barrera and J. Villegas and R. Lindig-Cisneros}, url = {http://www.revistaphyton.fund-romuloraggio.org.ar/vol82/GOMEZ_ROMERO.pdf}, year = {2013}, date = {2013-12-12}, journal = {Phyton}, volume = {82}, pages = {135-143}, keywords = {erosion, Lupinus, nitrogen, phosphorus, Pinus, pioneer, restoration ecology, temperate forests, understory}, pubstate = {published}, tppubtype = {article} } |
2012 |
Tenopala, J; González, F J; de la Barrera, E Physiological responses of the green manure, Vicia sativa, to drought Journal Article Botanical Sciences, 90 (3), pp. 305-311, 2012. Links | BibTeX | Tags: agroecology, drought, isohydric, nitrogen, Raman, Vicia @article{Tenopala2012, title = {Physiological responses of the green manure, Vicia sativa, to drought }, author = {J. Tenopala and F. J. González and E. de la Barrera}, url = {http://www.scielo.org.mx/pdf/bs/v90n3/v90n3a6.pdf}, year = {2012}, date = {2012-03-01}, journal = {Botanical Sciences}, volume = {90}, number = {3}, pages = {305-311}, keywords = {agroecology, drought, isohydric, nitrogen, Raman, Vicia}, pubstate = {published}, tppubtype = {article} } |
Orozco-Martínez, R; del-Val, E; Lindig-Cisneros, R; Paz, H; Quesada, M; de la Barrera, E Evaluation of three organic fertilizers for growing the widely cultivated crop Cucurbita pepo L. Journal Article African Journal of Agricultural Research, 7 (7), pp. 1087-1097, 2012. Links | BibTeX | Tags: agriculture, agroecology, compost, crop, Cucurbita, Eichornia, invasive species, nitrogen @article{Orozco-Martínez2012, title = {Evaluation of three organic fertilizers for growing the widely cultivated crop Cucurbita pepo L.}, author = {R. Orozco-Martínez and E. del-Val and R. Lindig-Cisneros and H. Paz and M. Quesada and E. de la Barrera }, url = {http://www.academicjournals.org/journal/AJAR/article-abstract/7FF8F8B44821}, year = {2012}, date = {2012-02-19}, journal = {African Journal of Agricultural Research}, volume = {7}, number = {7}, pages = {1087-1097}, keywords = {agriculture, agroecology, compost, crop, Cucurbita, Eichornia, invasive species, nitrogen}, pubstate = {published}, tppubtype = {article} } |
2010 |
Escutia-Lara, Y; de la Barrera, E; Martínez-delaCruz, Y; Lindig-Cisneros, R Respuesta a la adición de nitrógeno y fósforo en el crecimiento de Typha domingensis y Schoenoplectus americanus Journal Article Boletín de la Sociedad Botánica de México, 87 , pp. 83-87, 2010. Links | BibTeX | Tags: nitrogen, nutrition, phosphorus, Schoenoplectus, Typha, wetland @article{Escutia-Lara2010, title = {Respuesta a la adición de nitrógeno y fósforo en el crecimiento de Typha domingensis y Schoenoplectus americanus}, author = {Y. Escutia-Lara and E. de la Barrera and Y. Martínez-delaCruz and R. Lindig-Cisneros}, url = {http://www.scielo.org.mx/scielo.php?pid=S0366-21282010000200007&script=sci_arttext}, year = {2010}, date = {2010-01-01}, journal = {Boletín de la Sociedad Botánica de México}, volume = {87}, pages = {83-87}, keywords = {nitrogen, nutrition, phosphorus, Schoenoplectus, Typha, wetland}, pubstate = {published}, tppubtype = {article} } |
2005 |
de la Barrera, E; Andrade, J L Challenges to plant megadiversity: how environmental physiology can help Journal Article New Phytologist, 167 , pp. 5-8, 2005. Links | BibTeX | Tags: acclimation, agriculture, cactus, climate change, conservation, ecophysiology, legume, nitrogen, plant diversity, public policy, seed, stable isotopes, tropical forest @article{delaBarrera2005b, title = {Challenges to plant megadiversity: how environmental physiology can help}, author = {E. de la Barrera and J. L. Andrade}, url = {http://agro.mx/wp-content/uploads/2016/06/012-De-la-Barrera-Andrade-2005-New-Phytol.pdf}, year = {2005}, date = {2005-05-01}, journal = {New Phytologist}, volume = {167}, pages = {5-8}, keywords = {acclimation, agriculture, cactus, climate change, conservation, ecophysiology, legume, nitrogen, plant diversity, public policy, seed, stable isotopes, tropical forest}, pubstate = {published}, tppubtype = {article} } |
2004 |
Nobel, P S; de la Barrera, E CO2 uptake by the cultivated hemiepiphytic cactus, Hylocereus undatus Journal Article Annals of Applied Biology, 144 , pp. 1-8, 2004. Links | BibTeX | Tags: abscisic acid, agriculture, cactus, CO2, cultivation, Hylocereus, nitrogen, photosynthesis, pitahaya, temperature, tropical forest, water @article{Nobel2004, title = {CO2 uptake by the cultivated hemiepiphytic cactus, Hylocereus undatus}, author = {P. S. Nobel and E. de la Barrera}, url = {http://agro.mx/wp-content/uploads/2015/09/010-Nobel-De-la-Barrera-2004-Ann-Appl-Biol.pdf}, year = {2004}, date = {2004-04-04}, journal = {Annals of Applied Biology}, volume = {144}, pages = {1-8}, keywords = {abscisic acid, agriculture, cactus, CO2, cultivation, Hylocereus, nitrogen, photosynthesis, pitahaya, temperature, tropical forest, water}, pubstate = {published}, tppubtype = {article} } |
2002 |
Nobel, P S; de la Barrera, E Nitrogen relations for net CO2 uptake by the cultivated hemiepiphytic cactus, Hylocereus undatus Journal Article Scientia Horticulturae, 96 , pp. 281-292, 2002. Links | BibTeX | Tags: cactus, CAM, chlorophyll, CO2, Hoagland solution, Hylocereus, nitrogen, nutrition, pitahaya @article{Nobel2002b, title = {Nitrogen relations for net CO2 uptake by the cultivated hemiepiphytic cactus, Hylocereus undatus}, author = {P. S. Nobel and E. de la Barrera }, url = {http://agro.mx/wp-content/uploads/2016/06/004-Nobel-De-la-Barrera-2002-Sci-Hort.pdf}, year = {2002}, date = {2002-04-01}, journal = {Scientia Horticulturae}, volume = {96}, pages = {281-292}, keywords = {cactus, CAM, chlorophyll, CO2, Hoagland solution, Hylocereus, nitrogen, nutrition, pitahaya}, pubstate = {published}, tppubtype = {article} } |