Technological Institute of Ciudad Victoria
Tamaulipas, Mexico
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Navar J.,Technological Institute of Ciudad Victoria
Journal of Hydrology | Year: 2017

Models that accurately predict forest interception are essential both for water balance studies and for assessing watershed responses to changes in land use and the long-term climate variability. This paper compares the performance of four rainfall interception models—the sparse Gash (1995), Rutter et al. (1975), Liu (1997) and two new models (NvMxa and NvMxb)—using data from four spatially extensive, structurally diverse forest ecosystems in Mexico. Ninety-eight case studies measuring interception in tropical dry (25), arid/semi-arid (29), temperate (26), and tropical montane cloud forests (18) were compiled and analyzed. Coefficients derived from raw data or published statistical relationships were used as model input to evaluate multi-storm forest interception at the case study scale. On average empirical data showed that, tropical montane cloud, temperate, arid/semi-arid and tropical dry forests intercepted 14%, 18%, 22% and 26% of total precipitation, respectively. The models performed well in predicting interception, with mean deviations between measured and modeled interception as a function of total precipitation (ME) generally <5.8% and Nash-Sutcliffe efficiency E estimators >0.66. Model fitting precision was dependent on the forest ecosystem. Arid/semi-arid forests exhibited the smallest, while tropical montane cloud forest displayed the largest ME deviations. Improved agreement between measured and modeled data requires modification of in-storm evaporation rate in the Liu; the canopy storage in the sparse Gash model; and the throughfall coefficient in the Rutter and the NvMx models. This research concludes on recommending the wide application of rainfall interception models with some caution as they provide mixed results. The extensive forest interception data source, the fitting and testing of four models, the introduction of a new model, and the availability of coefficient values for all four forest ecosystems are an important source of information and a benchmark for future investigations in this area of hydrology. © 2017 Elsevier B.V.

Montes Dorantes P.N.,Autonomous University of Noreste | Montes Dorantes P.N.,Technological Institute of Ciudad Victoria | Jimenez Gomez M.A.,Technological Institute of Ciudad Victoria | Mexicano Santoyo A.,Technological Institute of Ciudad Victoria | Mendez G.M.,Technological Institute of Nuevo Leon
International Journal of Advanced Manufacturing Technology | Year: 2017

Measurements are the core of quality systems. The calibration of the measurement devices is a form of evaluating it. The variability of these measurement devices is verified to know the variation inherited in the measurement tool. Additionally, the dynamics of the actual production systems cannot be satisfied by the classic approaches of the human visual inspection. This happens because they exceed the human capacities, and this phenomenon causes the loss of reliability at the outputs of the system. This paper presents a hybrid model of adaptive neuro-fuzzy inference system (ANFIS) to evaluate quality features. Also, for this purpose, it offers knowledge-based expert system able to do the quality assurance tasks by learning and adaptation. The obtained results provide an acceptable error rate for this class of systems to run at the speed of the actual manufacturing system. © 2017 Springer-Verlag London

De JesUs-Bonilla V.S.,National Autonomous University of Mexico | Barrientos-Lozano L.,Technological Institute of Ciudad Victoria | ZaldIvar-RiverOn A.,National Autonomous University of Mexico
Systematics and Biodiversity | Year: 2017

Taeniopoda is a genus of grasshoppers currently represented by 12 species distributed from southern USA to Panama, with most of them occurring along the transitional Nearctic–Neotropical region in central and southern Mexico. Despite being a small group of conspicuous, colourful species, the systematics of Taeniopoda has been largely neglected, including its phylogenetic affinity with the morphologically similar, monotypic genus Romalea. Here, we assessed the species limits in 11 of the species of Teniopoda based on two mitochondrial (mt) markers (COI, cyt b). Phylogenetic relationships were reconstructed adding two nuclear gene markers (28S, H3). A relaxed molecular clock analysis was performed based on the mt markers. We detected nuclear mt paralogues (numts) and the probable introgression of T. tamaulipensis mtDNA in specimens of T. eques from central Mexico. Between six and 14 species of Taeniopoda were delimited by the sequence-based approaches performed (COI divergence with thresholds of 1 and 2%; General Mixed Yule-Coalescent (GMYC) model). The GMYC and 1% threshold analyses with COI were more congruent with the currently recognized morphology-based taxonomy with 10 and 11 putative species, respectively. Four of these species were regarded as ‘stable’, since they were supported by at least one of the molecular analyses and by diagnostic morphological features. The species-based phylogeny recovered Taeniopoda as paraphyletic with respect to the monotypic genus Romalea. Three morphologically and geographically congruent major clades were recovered, two with species having a considerably elevated pronotal crest and one with its members having it less elevated. The origin and subsequent diversification of Taeniopoda were estimated to occur from the mid and late Miocene to Pliocene, respectively. The current species diversity in Taeniopoda was estimated to occur during the Pleistocene, which was probably influenced by the climatic oscillations that occurred during this period and the uplift of mountain ranges in Central America. © The Trustees of the Natural History Museum, London 2017. All Rights Reserved.

Garcia-Morales L.J.,Technological Institute of Ciudad Victoria | Iamonico D.,University of Rome La Sapienza | Garcia Jimenez J.,Technological Institute of Ciudad Victoria
Phytotaxa | Year: 2017

As part of ongoing studies on Magnolia sect. Macrophylla in North America (Mexico), unusual populations from the humid forests of Sierra Madre Oriental (central western Tamaulipas State) were found. They are here formalized as a new species, M. alejandrae. Its morphology, ecology, and conservation status are provided. A morphological comparison with similar species and diagnostic key for the species of M. sect. Macrophylla are also included. The names Magnolia ashei, M. macrophylla, and M. dealbata are lectotypified, respectively, on specimens preserved at NCU, and P and on a Zuccarini illustration. An epitype (at M) was chosen for M. dealbata. © 2017 Magnolia Press.

Sanchez-Reyes U.J.,Technological Institute of Ciudad Victoria | Nino-Maldonado S.,Autonomous University of Tamaulipas | Barrientos-Lozano L.,Technological Institute of Ciudad Victoria | Trevino-Carreon J.,Autonomous University of Tamaulipas
Remote Sensing | Year: 2017

Loss of vegetation cover is a major factor that endangers biodiversity. Therefore, the use of geographic information systems and the analysis of satellite images are important for monitoring these changes in Natural Protected Areas (NPAs). In northeastern Mexico, the Natural Protected Area Altas Cumbres (NPAAC) represents a relevant floristic and faunistic patch on which the impact of loss of vegetation cover has not been assessed. This work aimed to analyze changes of land use and coverage (LULCC) over the last 42 years on the interior and around the exterior of the area, and also to propose the time of succession for the most important types of vegetation. For the analysis, LANDSAT satellite images from 1973, 1986, 2000, 2005 and 2015 were used, they were classified in seven categories through a segmentation and maximum likelihood analysis. A crosstabulation analysis was performed to determine the succession gradient. Towards the interior of the area, a significant reduction of tropical vegetation and, to a lesser extent, temperate forests was found, as well as an increase in scrub cover from 1973 to 2015. In addition, urban and vegetationfree areas, as well as modified vegetation, increased to the exterior. Towards the interior of the NPA, the processes of perturbation and recovery were mostly not linear, while in the exterior adjacent area, the presence of secondary vegetation with distinct definite time of succession was evident. The analysis carried out is the first contribution that evaluates LULCC in this important NPA of northeastern Mexico. Results suggest the need to evaluate the effects of these modifications on species. © 2017 by the authors.

Presley S.J.,University of Connecticut | Willig M.R.,University of Connecticut | Bloch C.P.,Bridgewater State University | Castro-Arellano I.,University of Connecticut | And 3 more authors.
Biotropica | Year: 2011

The metacommunity framework integrates species-specific responses to environmental gradients to detect emergent patterns of mesoscale organization. Abiotic characteristics (temperature, precipitation) and associated vegetation types change with elevation in a predictable fashion, providing opportunities to decouple effects of environmental gradients per se from those of biogeographical or historical origin. Moreover, expected structure is different if a metacommunity along an elevational gradient is molded by idiosyncratic responses to abiotic variables (expectation=Gleasonian structure) than if such a metacommunity is molded by strong habitat preferences or specializations (expectation=Clementsian structure). We evaluated metacommunity structure for 13 species of gastropod from 15 sites along an elevational transect in the Luquillo Experimental Forest of Puerto Rico. Analyses were conducted separately for the primary axis and for the secondary axis of correspondence extracted via reciprocal averaging. The metacommunity exhibited quasi-Clementsian structure along the primary axis, which represented a gradient of gastropod species specialization that was unassociated with elevation. The secondary axis represented environmental variation associated with elevation. Along this axis, the metacommunity exhibited Clementsian structure, with specialists characterizing each of three suites of sites that corresponded to three distinct forest types. These forest types are associated with low (tabonuco forest), mid- (palo colorado forest), or high (elfin forest) elevations. Thus, variation among sites in species composition reflected two independent processes: the first decoupled from elevational variation and its environmental correlates, and the second highly associated with environmental variation correlated with elevation. © 2010 The Author(s). Journal compilation © 2010 by The Association for Tropical Biology and Conservation.

Buzzetti F.M.,WBA World Biodiversity Association | Barrientos-Lozano L.,Technological Institute of Ciudad Victoria
Bioacoustics | Year: 2011

The songs of the following species are presented: Conocephalus (Xiphidion) cinereus Thunberg, 1815, C. (X.) ictus (Scudder, 1875), C. (X) magdalenae Nascrecki, 2000, C. (Anisoptera) strictus (Scudder, 1875), Dichopetala brevihastata Morse, 1902, D. castanea Rehn & Hebard, 1914, D. pollicifera Rehn & Hebard, 1914, Phyllophyllia guttulata Stå;l, 1863, Stilpnochlora azteca (Saussure, 1859), Boopedon gracile Rehn, 1904, Syrbula montezuma (Saussure, 1861) and Teniopoda tamaulipensis Rehn, 1904. Considerations on distribution, taxonomy, ethology, biodiversity and conservation are given. © 2011 AB Academic Publishers.

Barrientos-Lozano L.,Technological Institute of Ciudad Victoria | Rocha-Sanchez A.Y.,Technological Institute of Ciudad Victoria
Journal of Orthoptera Research | Year: 2013

Anew species of Phaneropterinae from northeastern Mexico, Pterodichopetala alfredoi n. sp., is described. P. alfredoi n. sp., may be easily separated from congeneric P. cieloi on morphological characters such as length of tegmen (shorter in P. alfredoi n. sp., leaving exposed the last abdominal tergites), male cerci composed of three processes vs two processes in P. cieloi, internal genitalia made up of two subtriangular processes, proximally and distally very produced (not so in P. cieloi), stridulatory file with ca 113 teeth (9-10 mm in length, 8-15 teeth/mm) vs P. cieloi stridulatory file ca 70 teeth (7-8 mm in length, 8-12 teeth/mm). Information on acoustic signals, ecology and distribution of P. alfredoi n. sp., is provided and discussed.

Cuervo-Robayo A.P.,National Autonomous University of Mexico | Tellez-Valdes O.,National Autonomous University of Mexico | Gomez-Albores M.A.,National Autonomous University of Mexico | Venegas-Barrera C.S.,Technological Institute of Ciudad Victoria | And 2 more authors.
International Journal of Climatology | Year: 2014

Climate surfaces are digital representations of climatic variables from a region in the planet estimated via geographical interpolation techniques. Climate surfaces have multiple applications in research planning, experimental design, and technology transfer. Although high-resolution climatologies have been developed worldwide, Mexico is one of the few countries that have developed several climatic surfaces. Here, we present an updated high-resolution (30arc sec) climatic surfaces for Mexico for the average monthly climate period 1910-2009, corresponding to monthly values of precipitation, daily maximum, and minimum temperature, as well as 19 bioclimatic variables derived from the monthly precipitation and temperature values. To produce these surfaces we applied the thin-plate smoothing spline interpolation algorithm implemented in the ANUSPLIN software to nearly 5000 climate weather stations countrywide. As an additional product and unlike the previous efforts, we generated monthly standard error surfaces for the three climate parameters, which can be used for error assessment when using these climate surfaces. Our climate surface predicted slightly drier and cooler conditions than the previous ones. ANUSPLIN diagnostic statistics indicated that model fit was adequate. We implemented a more recent error assessment, a set of withheld stations to perform an independent evaluation of the model surfaces. We estimate the mean absolute error and mean error, with the withheld data and all the available data. Average RTGCV for monthly temperatures was of 1.26-1.12°C and 24.67% for monthly precipitation, and a RTMSE of 0.48-0.56°C and 11.11%. The main advantage of the surfaces presented here regarding the other three developed for the country is that ours cover practically the entire 20th century and almost the entire first decade of the 21st century. It is the most up to date high-resolution climatology for the country. © 2013 Royal Meteorological Society.

Pedraza-Lara C.,National Autonomous University of Mexico | Barrientos-Lozano L.,Technological Institute of Ciudad Victoria | Rocha-Sanchez A.Y.,Technological Institute of Ciudad Victoria | Zaldivar-Riveron A.,National Autonomous University of Mexico
Molecular Phylogenetics and Evolution | Year: 2015

The genus Sphenarium (Pyrgomorphidae) is a small group of grasshoppers endemic to México and Guatemala that are economically and culturally important both as a food source and as agricultural pests. However, its taxonomy has been largely neglected mainly due to its conserved interspecific external morphology and the considerable intraspecific variation in colour pattern of some taxa. Here we examined morphological as well as mitochondrial and nuclear DNA sequence data to assess the species boundaries and evolutionary history in Sphenarium. Our morphological identification and DNA sequence-based species delimitation, carried out with three different approaches (DNA barcoding, general mixed Yule-coalescent model, Bayesian species delimitation), all recovered a higher number of putative species of Sphenarium than previously recognised. We unambiguously delimit seven species, and between five and ten additional species depending on the data/method analysed. Phylogenetic relationships within the genus strongly support two main clades, one exclusively montane, the other coastal. Divergence time estimates suggest late Miocene to Pliocene ages for the origin and most of the early diversification events in the genus, which were probably influenced by the formation of the Trans-Mexican Volcanic Belt. A series of Pleistocene events could have led to the current species diversification in both montane and coastal regions. This study not only reveals an overlooked species richness for the most popular edible insect in Mexico, but also highlights the influence of the dynamic geological and climatic history of the region in shaping its current diversity. © 2015 Elsevier Inc.

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