Una nueva especie del género Guillarmodia (Mollusca: Gastropoda: Pulmonata: Spiraxidae) del noreste de México

A new land snail, Guillarmodia (Guillarmodia) marcelae n. sp., Correa-Sandoval, Barrientos-Lozano & Strenth is described from the mountains of Sierra Los Soldados state of Tamaulipas in northeastern Mexico. This new species differs from other regional species of Guillarmodia by its smaller size and distinctive subsutural striations. Habitat information of the species and geographic distribution of related taxa are provided.Un nuevo caracol terrestre, Guillarmodia (Guillarmodia) marcelae n. sp. Correa-Sandoval, Barrientos -Lozano & Strenth es descrita para las montañas de la Sierra Los Soldados, región del estado de Tamaulipas en el noreste de México. Esta nueva especie difiere de otras especies regionales de Guillarmodia por su tamaño pequeño y distintivas estriaciones subsuturales. Se incluye información del hábitat de la especie y de la distribución geográfica de especies relacionada

GASTRÓPODOS TERRESTRES DEL SUR DE NUEVO LEÓN, MÉXICO

Forty three genera, 81 species and 14 subspecies of terrestrial gastropods belonging to 23 families are recorded for the southern region of the state of Nuevo León. Eighteen species are new records. The families with the largest number of species are the Spiraxidae (16), Urocoptidae (9) and Pupillidae (8). Those species with the greatest distribution are Gastrocopta pellucida and Pupisoma discoricola insigne. Eighty six species of terrestrial gastropods for the state of Nuevo León are recorded.Cuarenta y tres géneros, 81 especies y 14 subespecies de gastrópodos terrestres pertenecientes a 23 familias se registran para la región sur del estado de Nuevo León. Dieciocho especies son nuevos registros. Las familias con más especies son Spiraxidae (16), Urocoptidae (9) y Pupillidae (8). Las especies con mayor distribución son Gastrocopta pellucida y Pupisoma dioscoricola insigne. Tomando en cuenta los registros del norte del estado se conocen en total 86 especies para Nuevo León

Zoogeografía de los gastrópodos terrestres del sur de Nuevo León, México

The terrestrial gastropods of the southern region of the state of Nuevo León were surveyed (december, 2001 – december, 2004). Samples were obtained from 35 localities, in differents vegetational types. The primary zoogeographical relationships are characterized by the presence of the endemics (34 species or subspecies: 40.48%, high value in northeastern México), those of neotropical and neartic affinities (27 species: 32.14%) and those exhibiting panamerican distributions (13 species: 15.48%). The three families with the largest number of endemic species (or subspecies) are the Spiraxidae and Urocoptidae (both with eight species), and the Humboldtianidae (five species). The vegetational types with the greatest biogeographical values are the gallery forest and pine forest. The highest values of malacofaunal similarities are between the submountain shrubs and savannah cultivation and also between the oak-pine forest and gallery forest.Se estudiaron (diciembre de 2001 a diciembre de 2004) los gastrópodos terrestres de la región sur del estado Nuevo León. Las muestras fueron obtenidas en 35 localidades, en diferentes tipos de vegetación. Las principales afinidades zoogeográficas son el endemismo de 34 especies o subespecies (40.48% de la malacofauna, valor alto en el noreste de México), la neotropical principalmente y neártica de 27 especies (32.14%) y la distribución panamericana de 13 especies (15.48%). Las familias con mayor número de especies o subespecies endémicas son Spiraxidae y Urocoptidae, ambas con ocho, y Humboldtianidae con cinco. Los mayores valores biogeográficos de la malacofauna terrestre se presentaron en la vegetación de galería y en el bosque de pino. Las mayores similitudes malacofaunísticas se observan entre el matorral submontano y el pastizal cultivado y entre el bosque de pino-encino y la vegetación de galería

Characterization of mechanical vibrations in a metal structure using the transform Cepstrum

This work adequately characterizes and correlates the effects generated by inducing mechanical vibrations on a metallic structure as a means of determining or predicting potential alterations or failures in bodies used in civil and industrial works of a static nature. Vibration sensors (piezoelectric), experimental information capture software (Labview) and the application of signal processing and classification tools were used for this. Various previous works have used signal processing techniques such as Fourier and Wavelet. These show indications about the relationship between the processed signals and the structural alterations of the different tests. On this occasion, through the use of Cepstrum analysis as an alternative tool for the processing of mechanical vibrations and complementary to the use of a dissimilarity technique (Euclidean distance) for the assessment of the ability to differentiate between classes grouped according to the anomaly studied and The use of statistical indicators to evaluate the homogeneity of the data has made it possible to show deviations that can be linked to structural defects (perforation, welding, denting and shear) of a metallic armor at the laboratory level. Finally, it was evidenced that the use of Cepstrum coefficients as characteristic information of the anomaly, at an experimental level, broadens the knowledge base and undoubtedly allows the implementation of the bases to encourage the academic and commercial development of tools or techniques for remote inspection of static equipment that is of great use to society

ANÁLISIS ECOLÓGICO BÁSICO DE LOS GASTRÓPODOS TERRESTRES DE LA REGIÓN ORIENTAL DE SAN LUIS POTOSÍ, MÉXICO

Of 77 species of terrestrial gastropods found in the eastern region of the state of San Luis Potosí, the ecological conditions supporting the largest number of species of mollusks are as follows: oak forest (44 species), leaf litter and humus (66), soils which are humid throughout the year (53), 3000- 3500 mm annual rainfall (41) and 801-900 m altitude (43). Thysanophora hornii exhibits the greatest distribution with regard to vegetational types, humidity conditions, rainfall, soil types, and altitudinal ranges. The greatest values of diversity and evenness were obtained in the cloud forest (0.6895) and oak forest (0.3512) respectively. The chaparral exhibits the greatest dominance (0.9958) and habitat ecological width (0.3741). Mollusks communities were ecologically ranked lower than the tropical decidouos-subdeciduous forest. The highest qualitative similarity was observed between tropical deciduous-subdeciduous forest and savannah-cultivation (0.7462). The greatest quantitative similarity (0.3646) was observed between thorn forest and savannah-cultivation.En este estudio se caracterizaron las condiciones ecológicas en las que se presentaron 77 especies de gastrópodos terrestres en la región oriental de San Luis Potosí, existiendo más especies de moluscos en bosque de encino (44 especies), hojarasca y humus (66), suelos húmedos todo el año (53), precipitaciones de 3000-3500 mm anuales (41) y altitudes de 801-900 m (43). Thysanophora hornii es la de mas amplia distribución en función de los tipos de vegetación, condiciones de humedad, precipitación, tipos de suelo y rango de altitud. Los valores más grandes de diversidad y equitatividad se observaron en el bosque mesófilo de montaña (0.6895) y bosque de encino (0.3512). El mayor valor de dominancia (0.9958) y amplitud ecológica del hábitat (0.3471) se presentó en el matorral xerófilo. Las comunidades de gastrópodos terrestres se encontraron subordinadas ecológicamente a las del bosque tropical caducifolio – subcaducifolio, y a su vez ésta se halla subordinada a la del bosque de encino. El valor de similitud cualitativa más alto se observó entre el bosque tropical caducifolio-subcaducifolio y pastizal-cultivos (0.7462). Entre el bosque espinoso y pastizalcultivos se obtuvo el mayor valor de similitud cuantitativa (0.3646)

Estimation of the Maximum Sustainable Yield and the Optimal Fishing Effort of the Blue Crab (<em>Callinectes sapidus</em>, Rathbun 1896) of Laguna Madre, Tamaulipas, Mexico

The fishery of the blue crab (Callinectes sapidus) in Laguna Madre (LM), Tamaulipas, Mexico, with an average annual catch of 3307 tons, is of great importance economically and socially. The objective of this research was to estimate the carrying capacity (K), the catchability coefficient (q), the maximum sustainable yield (MSY) (tons), and the optimal fishing effort (fMSY) (traps). For this, a time series from 1998 to 2012 was used for the catch and number. The Fox (1970) and Schaefer (1954) models included in A Surplus-Production Model Incorporating Covariates (ASPIC) software were employed for this study. A set of statistical variability estimators and the Akaike?s, Bayesian, and Hannan-Quinn information criteria were used for the selection of models. The results obtained by the fox model were K = 54,000, q = 0.00008798, MSY = 2567 and fMSY = 146,900 traps, whereas for the Schaefer model, the results were K = 28,370, q = 0.00002425, MSY = 2008, and fMSY = 58,390. The model with the best adjustment was that of Schaefer. It is concluded that the fishing resource has been overexploited during the period 2003–2011, with an average annual surplus of 670 tons and 25,000 traps. It is recommended to consider the MSY and fMSY values of the Schaefer model for the National Fishing Charter (NFC)

Sphecidae y crabronidae (hymenoptera) de algunos municipios del centro y sur de Tamaulipas, México

One hundred and twenty four species and forty four genera of sphecoid wasps collected at localities of eleven municipalities of Tamaulipas, Mexico were recorded. Twenty three species and three genera are new records for the country meanwhile 94 species and 26 genera are new records for the state of Tamaulipas. Crabronidae and Sphecidae comprise 98 and 26 species respectively. The most abundant species were Ammophila picipes and Trypoxylon (Trypargilum) spinosum. Ammophila picipes is the most widely distributed species. From the 103 genera and 658 species recorded in Mexico 54 genera (52%) and 142 species (21.6%) have been found in Tamaulipas.Se registran 124 especies y 44 géneros de avispas esfécidas de localidades de once municipios de Tamaulipas, México. Veintitrés especies y tres géneros son nuevos registros para el país y 94 especies y 26 géneros son nuevos registros para el Estado de Tamaulipas. Crabronidae y Sphecidae comprenden 98 y 26 especies, respectivamente. Las especies más abundantes son Ammophila picipes y Trypoxylon (Trypargilum) spinosum. La especie Ammophila picipes también es la de mayor distribución. Con la información disponible, para la República Mexicana se conocen 103 géneros y 658 especies y para Tamaulipas 54 géneros y 142 especies

Tracing Water Sources and Fluxes in a Dynamic Tropical Environment: From Observations to Modeling

Código de proyecto: Isotope Network for Tropical Ecosystem Studies (ISONet). Producción relacionada con el Observatorio del Agua y Cambio Global (OACG).Tropical regions cover approximately 36% of the Earth’s landmass. These regions are home to 40% of the world’s population, which is projected to increase to over 50% by 2030 under a remarkable climate variability scenario often exacerbated by El Niño Southern Oscillation (ENSO) and other climate teleconnections. In the tropics, ecohydrological conditions are typically under the influence of complex land-ocean-atmosphere interactions that produce a dynamic cycling of mass and energy reflected in a clear partition of water fluxes. Here, we present a review of 7 years of a concerted and continuous water stable isotope monitoring across Costa Rica, including key insights learned, main methodological advances and limitations (both in experimental designs and data analysis), potential data gaps, and future research opportunities with a humid tropical perspective. The uniqueness of the geographic location of Costa Rica within the mountainous Central America Isthmus, receiving moisture inputs from the Caribbean Sea (windward) and the Pacific Ocean (complex leeward topography), and experiencing strong ENSO events, poses a clear advantage for the use of isotopic variations to underpin key drivers in ecohydrological responses. In a sequential approach, isotopic variations are analyzed from moisture transport, rainfall generation, and groundwater/surface connectivity to Bayesian and rainfall-runoff modeling. The overarching goal of this review is to provide a robust humid tropical example with a progressive escalation from common water isotope observations to more complex modeling outputs and applications to enhance water resource management in the tropics.UCR::Vicerrectoría de Investigación::Unidades de Investigación::Ciencias Básicas::Centro de Investigaciones Geofísicas (CIGEFI)UCR::Vicerrectoría de Docencia::Ciencias Básicas::Facultad de Ciencias::Escuela de FísicaUCR::Vicerrectoría de Docencia::Ciencias Sociales::Facultad de Ciencias Sociales::Escuela de Geografí

Microcentrum tecactli, nueva especie de Phaneropteridae (Orthoptera: Tettigonioidea) del noreste de México

Microcentrum tecactli n. sp., Barrientos-Lozano, Fernández-Azuara &amp; Rocha-Sánchez, 2018, is described from specimens collected in the Huasteca region in the State of Hidalgo Mexico. Microcentrum tecactli exhibits affinities with Microcentrum rhombifolium (Saussure, 1859). However, it differs in morphological and acoustic characters. In males the length of the stridulatory file is 4.2 mm with ca. 62 teeth vs. 4 mm ca. 55 teeth in M. rhombifolium; the subgenital plate is distally more produced, the styles are shorter and diverging; the cerci are distally narrower, and the internal genitalia is different. Lone males produce two types of acoustic signals: i) a calling song that consists of a regular buzz made up of a single syllable (one Pulse Train Group), average duration 155±38 ms (78-212 ms) (3 males; n=29 samples one min each), with inter-syllable interval (Major Interval=MaI) of 1483±364 ms (115-2394 ms). Frequency spectrum is between 4 to &gt;30 kHz, peak frequency (fi) is at 6-16 kHz. Syllables repetition rate is 48±4.36/min (43-55; n=10 samples one min each). ii) Sequence of ticks made up of two paired-phrases with an average duration of 7.53±0.16 s (3 males; n=5 paired-sequences of ticks); phrases 1 and 2 average duration is similar in each sequence, 2.3±0 s. The number of pulses per phrase is also the same in both phrases: 29 ±0 each. Major interval duration between sequences of ticks of two paired-phrases is 5.37±2.75 s. Minor interval duration between phrases 1 and 2 is 1.42±0.12 s (1.27-1.51). Frequency range is between 4 to &gt;30 kHz, after 30 kHz the amount of energy is minimal. Dominant frequency spectrum ranges from 4 to 22 kHz and peak frequency (fi) is at 6-16 kHz. Repetition rate of tick-paired sequences is 0.1/s (6/min); in four paired-sequences of ticks the repetition rate of pulses/ticks in phrases 1 and 2 was the same, 12.6/s each one.Se describe Microcentrum tecactli n. sp., Barrientos-Lozano, Fernández-Azuara &amp; Rocha-Sánchez, 2018, de ejemplares recolectados en la huasteca hidalguense en México. Microcentrum tecactli n. sp., presenta afinidades con Microcentrum rhombifolium (Saussure, 1859). No obstante, difiere de ésta en caracteres morfológicos y acústicos. Los machos producen dos tipos de señales acústicas: i) el canto de llamado que consiste de un siseo regular, de una sola sílaba, cuya duración promedio es de 155±38 ms (78-212 ms) (3 machos; n=29 muestras de un min cada una), con intervalo entre sílabas (Intervalo Mayor=IMa) de 1483±364 ms (115-2394 ms). El rango de frecuencia es de 4 a &gt;30 kHz y la frecuencia pico (fi) de 6-16 kHz. La tasa de repetición de sílabas es de 48±4.36/min (43-55; n=10 muestras de un min cada una). ii) Secuencias de pulsaciones/tics de dos frases-pares con duración promedio de 7.53±0.16 s (3 machos; n=5 secuencias-pares de pulsaciones/tics); la duración promedio de las frases 1 y 2 es igual en cada secuencia, 2.3±0 s. El número de pulsaciones por frase es también igual en ambas frases, en cada secuencia: 29±0. El intervalo mayor entre secuencias de pulsaciones de dos frases-pares es de 5.37± 2.75 s. El intervalo menor entre las frases 1 y 2 es de 1.42±0.12 s (1.27-1.51 s). El rango de frecuencia y la frecuencia pico (fi) coinciden con las del canto de llamado. La tasa de repetición de secuencias de pulsaciones-pares es de 0.1/s (6/min), en cuatro secuencias de pulsaciones-pares la tasa de repetición de pulsaciones/s en las frases 1 y 2 fue igual, 12.6 en cada una