Examinando por Autor "Franco, Lida Marcela"
Mostrando1 - 4 de 4
Resultados por página
Opciones de clasificación
- PublicaciónSólo datosEL CASO DE LA NUTRIA NEOTROPICAL (Lontra longicaudis Olfers, 1818) COMO MASCOTA EN EL RÍO MAGDALENA (COLOMBIA)(Boletin Cientifico del Centro de Museos, 2018-08-08) Restrepo, Carlos Andrés; Botero Botero, Álvaro; Puerta Parra, Juan Camilo; Franco, Lida Marcela; Guevara, GiovanyObjetivo: Demostrar la interacción hombre-fauna silvestre a través de dos reportes de tenencia de fauna silvestre como mascota en un río colombiano. Alcance:Se reportan dos casos de interacción (como mascota) entre el hombre y la nutria neotropical (Lontra longicaudis Olfers, 1818) en dos tributarios de la cuenca del río Magdalena (Villavieja y La Miel; 2012 y 2015, respectivamente). Metodología:Se recolectó información con base en observación directa en campo y diálogos informales con pescadores. Principales resultados:Se registraron dos individuos adultos (macho/hembra) en el río Villavieja (Tello, Huila) y una hembra juvenil en el río La Miel (Norcasia, Caldas). En ambos casos se observó interacción con personas o animales domésticos. Conclusiones:Se encontró que las nutrias y los pobladores pueden compartir el mismo paisaje ribereño. Sin embargo, es necesario fortalecer el enfoque de educación ambiental, principalmente sobre tráfico y tenencia de fauna silvestre como mascotas. Asimismo, se debe concientizar a los habitantes de la cuenca del río Magdalena, para promover la protección a largo plazo de las poblaciones de la nutria neotropical.
- PublicaciónSólo datosElectochemical detection of imidacloprid using a screen printed single walled carbon nanotubes coated with and ionic liquids(International Journal of Electrochemical Sciences, 2018-05-10) River-Guzman, Karla; Franco, Lida Marcela; García-Beltrán, Olimpo; Calderón, Jorge A.; Nagles, EdgarThe simple modification of a screen printed single walled carbon nanotubes with ionic liquid 1-butyl-3-metilimidazolium tetrafluorborate allowed the development of a fast and selective methodology to determine imidacloprid (IMI). The morphological and conductive characteristics of the modified surface were analyzed with scanning electron microscopy and electrochemical impedance spectroscopy. The modified surface showed great activity towards the reduction of IMI to -1.2 V. The analytical variables were optimized using linear sweep voltammetry at 0.1 V for 60s, obtaining a limit of detection of 0.21 mg L-1(0.82 μmol L-1). Relative standard deviation with six different electrodes was of 2.6 % (n = 5). Finally, the potential interferers were studied and the sensor was applied in the determination of IMI using samples of commercial honey with recovery between 88.0 and 105.0 % for IMI.
- PublicaciónSólo datosLeptin levels, seasonality and thermal acclimation in the Microbiotherid marsupial Dromiciops gliroides: Does photoperiod play a role?(Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology, 2017-01-15) Franco, Lida Marcela; Contreras, Carolina; Place, Ned J.; Bozinovic, Francisco; Nespolo, Roberto F.Mammals of the Neotropics are characterized by a marked annual cycle of activity, which is accompanied by several physiological changes at the levels of the whole organism, organs and tissues. The physiological characterization of these cycles is important, as it gives insight on the mechanisms by which animals adjust adaptively to seasonality. Here we studied the seasonal changes in blood biochemical parameters in the relict South American marsupial Dromiciops gliroides (“monito del monte” or “little mountain monkey”), under semi-natural conditions. We manipulated thermal conditions in order to characterize the effects of temperature and season on a battery of biochemical parameters, body mass and adiposity. Our results indicate that monitos experience an annual cycle in body mass and adiposity (measured as leptin levels), reaching a maximum in winter and a minimum in summer. Blood biochemistry confirms that the nutritional condition of animals is reduced in summer instead of winter (as generally reported). This was coincident with a reduction of several biochemical parameters in summer, such as betahydroxybutyrate, cholesterol, total protein concentration and globulins. Monitos seem to initiate winter preparation during autumn and reach maximum body reserves in winter. Hibernation lasts until spring, at which time they use fat reserves and become reproductively active. Sexual maturation during summer would be the strongest energetic bottleneck, which explains the reductions in body mass and other parameters in this season. Overall, this study suggests that monitos anticipate the cold season by a complex interaction of photoperiodic and thermal cues.
- PublicaciónSólo datosLinking riparian forest harvest to benthic macroinvertebrate communities in Andean headwater streams in southern Chile(Limnologica, 2018-02-12) Guevara, Giovany; Godoy, Roberto; Franco, Lida MarcelaHeadwater streams are fully linked to surrounding riparian vegetation through coarse and fine organic matter inputs. However, forestry operations in or close to riparian corridors, particularly in mountainous forested microcatchments, can alter both the organic matter dynamics and the composition, structure and function of stream macroinvertebrate assemblages. Although it is an issue of great concern elsewhere, in Andean headwater streams scarce information exist about this respect. By using a paired-catchment approach (thinned vs. unthinned) in two sets of selected evergreen and deciduous small streams in southern Chile (39°S), we evaluated the effects of forest harvest on seasonal and annual litterfall dynamics and the structural and functional attributes of macroinvertebrates between January 2008 and January 2009. Metrics used to assess changes included riparian litterfall input, invertebrate colonization and leaf decomposition of dominant plant species (evergreen: Laureliopsis philippiana, Myrceugenia planipes; deciduous: Nothofagus alpina), taxa richness, functional feeding group (FFG) composition, and their densities and biomasses for each stream. In both experimental trials, microcatchments registered significant differences in the seasonal litterfall input. The total organic matter input was as follows: Unthinned evergreen (UE) = 3699, thinned evergreen (TE) = 3249, unthinned deciduous (UD) = 3151, and thinned deciduous (TD) = 2981 kg ha−1y−1. Leaf dry mass losses were significantly higher during summer and spring for L. philippiana and during summer and autumn for N. alpina. These results were concomitant to decomposition rates and macroinvertebrate abundance during colonization of the leaf bags. Macroinvertebrate density and biomass were also contrasted; shredders were the dominant FFG and showed significant seasonal differences between microcatchments in both in-stream and leaf bag studies. There were generally no major changes in FFG composition or taxa richness, but differences were detected comparatively in the abundance or density of collectors and shredders. Our results suggest that forestry activities carried out on riparian vegetation of Andean headwater streams can affect the structural and functional role of plants and benthic invertebrates and nutrient fluxes downstream.