1,374 research outputs found
Identificación y aplicación en la conservación de los efectos señal, ruido y taxonómicos en patrones de diversidad
Ongoing research on butterflies and birds in the Great Basin has identified biogeographic patterns while elucidating how dynamic measures of diversity (species richness and turnover) affect inferences for conservation planning and adaptive management. Nested subsets analyses suggested that processes influencing predictability of assemblage composition differ among taxonomic groups, and the relative importance of those processes may vary spatially within a taxonomic group. There may be a time lag between deterministic environmental changes and a detectable faunal response, even for taxonomic groups that are known to be sensitive to changes in climate and land cover. Measures of beta diversity were sensitive to correlations between sampling resolution and local environmental heterogeneity. Temporal and spatial variation in species composition indicated that spatially extensive sampling is more effective for drawing inferences about biodiversity responses to environmental change than intensive sampling at
relatively few, smaller sites.Los estudios de mariposas y aves en el Great Basin han identificado patrones biogeográficos que permiten evaluar cómo las medidas dinámicas de biodiversidad (riqueza específica y renovación de especies) pueden afectar la planificación y la gestión adaptativa de la conservación. El análisis de subgrupos anidados sugiere que los procesos que influyen en la predicibilidad de la composición de los grupos difieren entre los distintos grupos taxonómicos. Asimismo la importancia relativa de estos procesos puede variar espacialmente dentro de un grupo taxonómico. Puede haber un retraso en el tiempo entre los cambios ambientales deterministas y una respuesta faunística detectable, incluso para los grupos taxonómicos que se sabe que son sensibles a los cambios del clima y de la cubierta del suelo. Las medidas de diversidad beta eran sensibles a las correlaciones entre la resolución del muestreo y la heterogeneidad ambiental local. La variación espacial y temporal en la composición de especies indicó que el muestreo extensivo en el espacio es más efectivo, para obtener inferencias sobre cómo responde la biodiversidad a cambios ambientales, que el muestreo intensivo, en relativamente pocos sitios y más pequeños
Identification and conservation application of signal, noise, and taxonomic effects in diversity patterns
Ongoing research on butterflies and birds in the Great Basin has identified biogeographic patterns while elucidating how dynamic measures of diversity (species richness and turnover) affect inferences for conservation planning and adaptive management. Nested subsets analyses suggested that processes influencing predictability of assemblage composition differ among taxonomic groups, and the relative importance of those processes may vary spatially within a taxonomic group. There may be a time lag between deterministic environmental changes and a detectable faunal response, even for taxonomic groups that are known to be sensitive to changes in climate and land cover. Measures of beta diversity were sensitive to correlations between sampling resolution and local environmental heterogeneity. Temporal and spatial variation in species composition indicated that spatially extensive sampling is more effective for drawing inferences about biodiversity responses to environmental change than intensive sampling at relatively few, smaller sites
Dynamic Magnetography of Solar Flaring Loops
We develop a practical forward fitting method based on the SIMPLEX algorithm
with shaking, which allows the derivation of the magnetic field and other
parameters along a solar flaring loop using microwave imaging spectroscopy of
gyrosynchrotron emission. We illustrate the method using a model loop with
spatially varying magnetic field, filled with uniform ambient density and an
evenly distributed fast electron population with an isotropic, power-law energy
distribution.Comment: ApJ Letters, in pres
New Interactive Solar Flare Modeling and Advanced Radio Diagnostics Tools
The coming years will see routine use of solar data of unprecedented spatial
and spectral resolution, time cadence, and completeness in the wavelength
domain. To capitalize on the soon to be available radio facilities such as the
expanded OVSA, SSRT and FASR, and the challenges they present in the
visualization and synthesis of the multi-frequency datasets, we propose that
realistic, sophisticated 3D active region and flare modeling is timely now and
will be a forefront of coronal studies over the coming years. Here we summarize
our 3D modeling efforts, aimed at forward fitting of imaging spectroscopy data,
and describe currently available 3D modeling tools. We also discuss plans for
future generalization of our modeling tools.Comment: 4 pages; IAU Symposium # 274 "Advances in Plasma Astrophysics"; typo
remove
- …