Sacramento River Predator Diet Analysis: A Comparative Study

This study examined diets of two predatory fish species, the native Sacramento Pikeminnow (Ptychocheilus grandis) and the introduced Striped Bass (Morone saxatilis), in the Sacramento River, California, USA. Both species have been implicated in native species declines through predation, eliciting our investigation of their diets in the Sacramento River. Sampling occurred between March and November 2017, and was conducted via hook and line on a 35-km reach near Chico, California. Habitat types sampled include engineered structures (water diversions and beam bridges), rip-rapped channel edges, and natural riverbank. Stomach contents were collected via gastric lavage and later processed using visual, gravimetric, and genetic techniques. Diets of Sacramento Pikeminnow and Striped Bass were highly similar as determined through index of relative importance and PERMANOVA modeling. Water temperature was the only variable that significantly affected diet composition. Results reflect similar dietary niches for both species in the Sacramento River

Simulación de una cámara de combustión parauna microturbina de gas utilizando el programa de dinámica de fluidos fluent

En este artículo muestra los resultados de la simulación de una cámara de combustión diseñada y construida por estudiantes y docentes de la facultad de Ingeniería Mecánica de la Universidad Tecnológica de Pereira; integrantes del grupo de investigación de Sistemas Térmicos y Potencia mecánica. La cámara de combustión en cuestión, ha hecho parte de dos proyectos finales de grado de cuatro estudiantes de la facultad. El primero fue el diseño y construcción; el segundo de mejoras, pruebas y puesta a punto. La simulación fue realizada con el programa de dinámica de fluidos FLUENT y tiene como objeto principal validar los resultados obtenidos en los procesos de diseño y puesta a punto

Simulación de una cámara de combustión parauna microturbina de gas utilizando el programa de dinámica de fluidos fluent

En este artículo muestra los resultados de la simulación de una cámara de combustión diseñada y construida por estudiantes y docentes de la facultad de Ingeniería Mecánica de la Universidad Tecnológica de Pereira; integrantes del grupo de investigación de Sistemas Térmicos y Potencia mecánica. La cámara de combustión en cuestión, ha hecho parte de dos proyectos finales de grado de cuatro estudiantes de la facultad. El primero fue el diseño y construcción; el segundo de mejoras, pruebas y puesta a punto. La simulación fue realizada con el programa de dinámica de fluidos FLUENT y tiene como objeto principal validar los resultados obtenidos en los procesos de diseño y puesta a punto

Morphometric relations for body size and mouth dimensions for four fish species in the Strait of Gibraltar

Background. The deep-water longline fishery of the blackspot seabream, Pagellus bogaraveo, is an economically important fishery in the Strait of Gibraltar, which is a very complex transition ecosystem between the Mediterranean Sea and the Atlantic Ocean with an extreme spatial and temporal variability. This paper presents a series of morphometric relations for the four most important species in this fishery. Some ecological considerations about the results are also discussed. Materials and methods. The data were collected during a gear selectivity study, using different sizes of hooks baited with sardine. Relations for weight–length, length–length, and mouth dimensions for blackspot seabream, Pagellus bogaraveo (Brünnich, 1768); Atlantic pomfret, Brama brama (Bonnaterre, 1788); blackbelly rosefish, Helicolenus dactylopterus (Delaroche, 1809); and Mediterranean horse mackerel, Trachurus mediterraneus (Steindachner, 1868) were estimated and compared with the ones reported for the same species from other areas. Results. The sample size varied from 89 for T. mediterraneus to 2180 for P. bogaraveo. The fitted L–W relations explained more than 81% of the variance. For P. bogaraveo and T. mediterraneus, the estimated allometric coefficient was higher than those reported for other areas, showing a faster increase in weight, in contrast to H. dactylopterus and B. brama that showed a slower increase in weight. Moreover, linear and highly significant relations between mouth size and fish length were found for P. bogaraveo, H. dactylopterus, and T. mediterraneus. Conclusion. In this study, the first record for total length–standard length relation for H. dactylopterus is reported based on real measurements. There has been no previous studies on the relation between the different mouth size dimensions for the studied species as well as for mouth size and body length relations for P. bogaraveo and H. dactylopterus. The difference between estimated and reported coefficients might be attributed to different environmental adaptations and to the size ranges used due to the gear-size selectivity

Cerebral Infarction Associated with Cocaine Use

We report the case of a young man with an acute infarction of the left putamen and caudate nucleus, whose symptoms appeared six hours after intranasal use of approximately 0.5 g of cocaine hydrochloride. It seems probable that in this patient cocaine consumption played a role in the development of stroke

Is the vessel fishing? Discrimination of fishing activity with low-cost intelligent mobile devices through traditional and heuristic approaches

Knowing the activity of fishing vessels accurately and in real time means a leap in quality in the management of fishing activity. This paper presents the development of a new fishing activity monitoring integral system (FAMIS) that can complement and overcome the limitations of current fishing vessel monitoring systems (VMS). FAMIS is developed on the basis of a low-cost mobile device with GPS sensors, accelerometer, gyroscope and magnetic field and integrates different statistical methods (discriminant functions) and heuristics (artificial neural networks and vectorial support machines) as techniques to classify the information recorded by the sensors of a mobile device during fishing activity. The results obtained with FAMIS indicate that, in general, heuristics have a high degree of discrimination of each of the phases of fishing operation and that, in particular, multilayer perceptrons (MLPs) are capable of correctly identifying 96.3% of towing phases using only GPS and gyro sensors

Light‐Emitting Diodes: Progress in Plant Micropropagation

In commercial micropropagation laboratories, the light source is one of the most important factors controlling plant morphogenesis and metabolism of plant cells and tissue and organ cultures. Lamp manufacturers have begun to rate lamps specifically for plant needs. The traditional light source used for in vitro propagation is fluorescent lamps (FLs). However, power consumption in FL use is expensive and produces a wide range of wavelengths (350–750 nm) unnecessary for plant development. Light‐emitting diodes (LEDs) have recently emerged as an alternative for commercial micropropagation. The flexibility of matching LED wavelengths to plant photoreceptors may provide more optimal production, influencing plant morphology and chlorophyll content. Although previous reports have confirmed physiological effects of LED light quality on morphogenesis and growth of several plantlets in vitro, these study results showed that LED light is more suitable for plant morphogenesis and growth than FLs. However, the responses vary according to plant species. This chapter describes the applications and benefits of LED lamps on chlorophyll in plant micropropagation. Two study cases are exposed, Anthurium (Anthurium andreanum) and moth orchids (Phalaenopsisis sp.), both species with economic importance as ornamental plants, where LEDs have a positive effect on in vitro development and chlorophyll content

Descripcion y cultivo de un nuevo mixomicete, Licea succulenticola

A new succulenticolous myxomycete of the genus Licea is described based on material from Spain (the Canary Islands), Mexico and the USA.Se describe una nueva especie de Myxomycetes, perteneciente al genero Licea, que se desarrolla en plantas suculentas. Los materiales proceden de España (Islas Canarias), México y Estados Unidos. Se parece a L biforis pero difiere en sus pequenos esporóforos y en sus esporas mayores, amarillo-naranjas, con una gruesa pared que gradualmente hacia un lado se adelgaza y se vuelve mas pálida. La estabilidad de estos caracteres ha quedado demostrada por el cultivo de espora a espora en laboratorio.This research has been supported by the Cooperation Program between the Consejo Superior de Investigaciones Científicas (CSIC) and the Consejo Nacional de Ciencia y Tecnología of Mexico (CONACyT) (grant 2001MX0014), and the Ministerio de Ciencia y Teconología of Spain (grant REN2002-00445).Peer reviewe