100 research outputs found

    Water appropriation and ecosystem stewardship in the Baja Desert

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    The UNESCO San Francisco Rock Paintings polygon within El Vizcaino Biosphere Reserve in the Baja California Peninsula derives its moisture from the North American monsoon. There, ranchers have depended on the desert since the 18th century. More recently, the desert has depended on the environmental stewardship of the ranchers who have allayed mining exploitation and archaeological looting. Using a Rapid Assessment Procedure (RAP), climate data, and geographical information, sustainability was assessed and foreseeable risks identified, on behalf of the Reserve. The results showed that the costs of stewardship were in terms of water appropriation and livestock herbivory. The socio-ecological system also faced hydrological risks derived from runoff, high evaporation rates and climate change. Additional risks stemmed from the increasing global demand for minerals, including hydrocarbons, found in the Reserve. These external drivers could substantially alter the attitudes of the ranchers or the land tenure. Land abandonment might become possible as children and women seemed to out-migrate from the polygon. Solutions were identified based on the supply and demand for water and should enhance resilience via watershed management and in-ranch water appropriate technologies

    Kinect as an access device for people with cerebral palsy: A preliminary study

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    Cerebral palsy (CP) describes a group of disorders affecting the development of movement and posture, causingactivity limitation. Access to technology can alleviate some of these limitations. Many studies have used vision- based movement capture systems to overcome problems related to discomfort and fear of wearing devices. Incontrast, there has been no research assessing the behavior of vision-based movement capture systems in peoplewith involuntary movements. In this paper, we look at the potential of the Kinect sensor as an assistive technologyfor people with cerebral palsy. We developed a serious game, called KiSens Números, to study the behavior ofKinect in this context and eighteen subjects with cerebral palsy used it to complete a set of sessions. The resultsof the experiments show that Kinect filters some of peoples involuntary movements, confirming the potential ofKinect as an assistive technology for people with motor disabilities

    Tectonic-palaeoenvironmental forcing of clay-mineral assemblages in nonmarine settings: the Oligocene-Miocene As Pontes Basin (Spain)

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    Two small, alluvial-lacustrine subbasins developed during the early restraining overstep stages of the Oligocene-Miocene As Pontes strike-slip Basin (NW Spain). Later, the basin evolved into a restraining bend stage and an alluvial-swamp-dominated depositional framework developed. The palaeobiological record demonstrates that the Oligocene-Miocene palaeoclimate in NW Spain was subtropical, warm and humid to subhumid

    Design and qualification of a supersonic wind tunnel for induced boundary layer transition research

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    This paper presents the design and the results of the qualification test campaign of a multiple Mach number supersonic wind tunnel designed for induced boundary layer transition. Its characteristics, function, and instrumentation are described. The range of Mach numbers successfully span is presented along with the measured intensities of freestream fluctuations. All the measurement techniques implemented in the test campaigns after the qualification are introduced, and some results shown and commented to highlight their potentialities.Peer ReviewedPostprint (author's final draft

    Dispersal of Neophilaenus campestris, a vector of Xylella fastidiosa, from olive groves to over-summering hosts

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    [EN] Neophilaenus campestris is one of the spittlebugs (Hemiptera: Cercopoidea) able to transmit Xylella fastidiosa to olive trees. Considering its vector ability and the wide distribution of this species in Spain, N. campestris should be considered a serious threat to key crops such as olive, almonds and grapevines. Migration and dispersal abilities of insect vectors have profound implications in the spread of vector-borne diseases. Thus, knowledge on the dispersal ability of N. campestris is essential to model, predict and limit the spread of the diseases caused by X. fastidiosa. A mass-mark-recapture technique was developed to track between-field movements of N. campestris during its late spring migration from the ground cover grasses within olive groves to sheltered areas dominated by pine trees. The fluorescent dust used for marking did not affect the survival nor the flying ability of N. campestris. Spittlebug adults captured in olive groves during late spring were dusted with fluorescent colours and released in different locations. Six recapture samplings were performed 23¿42 days after release in 12 different sites located within a maximum distance of 2.8 km from the release point. Results indicated that N. campestris was able to disperse a maximum distance of 2,47 m in 35 days. Furthermore, flight mill studies showed that N. campestris was able to fly long distances, reaching 1.4 km in an 82-min single flight. Altogether, our findings suggest that eradication measures are of limited value because vectors are able to disperse rapidly over distances much longer than expected.Ministerio de Ciencia e Innovacion, Grant/Award Number: AGL2017-89604--R and PRE2018-083307; Comunidad de Madrid, Grant/Award Number: FP19-XYLELLALago, C.; Morente, M.; De Las Heras-Bravo, D.; Martí-Campoy, A.; Rodríguez-Ballester, F.; Plaza, M.; Moreno, A.... (2021). Dispersal of Neophilaenus campestris, a vector of Xylella fastidiosa, from olive groves to over-summering hosts. Journal of Applied Entomology. 145(7):648-659. https://doi.org/10.1111/jen.12888S648659145

    Comparing the allelopathic potential of exotic and native plant species on understory plants: are exotic plants better armed?

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    Allelopathy is thought to be a key mechanism in biological invasions. Our study aimed to assess the effects of aqueous extracts of leaves from three different exotic tree species common in Spanish riparian forests on the germination of six herbaceous species common in the understory of these ecosystems. We compared the effects of exotic species with those of a native tree species, the white poplar. Our results showed that germination speed and radicle growth of target species were the variables more sensitive to extracts, while percent germination was barely affected. Mostly, extracts had a negative effect on germination speed and radicle growth of all species, except Chenopodium album. White poplar extracts caused similar or even more negative effects than those of the exotic species. Our results show that allelopathy a complex phenomenon, in which native species are also involved

    Comparing the allelopathic potential of exotic and native plant species on understory plants: are exotic plants better armed?

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    La alelopatía es un mecanismo clave en las invasiones biológicas. Este estudio se propuso analizar el efecto de extractos acuosos de hojas de tres especies de árboles exóticos comunes en bosques ri- parios españoles sobre la germinación de seis herbáceas comunes en su sotobosque. Comparamos los efectos de las especies exóti- cas con los de una especie de árbol nativo, el álamo blanco. Las variables más sensibles a los extractos fueron la velocidad de ger- minación y el crecimiento radicular, mientras que el porcentaje de germinación apenas fue afectado. Principalmente, los extractos tu- vieron un efecto negativo sobre la germinación de todas las espe- cies, excepto Chenopodium album. El álamo blanco causó efectos similares o incluso más negativos que las especies exóticas. Nues- tros resultados muestran que la alelopatía es un fenómeno com- plejo, en el que las especies nativas también están involucradas
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