Aplicación De Sensores Remotos en El Análisis De La Fragmentación Del Paisaje en Cuchillas De La Zarca, México

Mata, Gerardo Daniel De León; Pinedo-Álvarez, Alfredo; Guerrero, José Hugo Martínez

doi:10.14350/rig.36568

Cited by 16 publications

(15 citation statements)

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“…) and may increase wintering densities of species of grassland sparrows (De León Mata et al. ). Previous research has demonstrated that more shrub cover and taller shrubs can limit abundance of some wintering grassland species of birds in Chihuahuan Desert grasslands (Pool et al.…”

Section: Discussionmentioning

confidence: 99%

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Winter survival of North American grassland birds is driven by weather and grassland condition in the Chihuahuan Desert

et al. 2017

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Populations of grassland birds that overwinter in the Chihuahuan Desert are declining more rapidly than other grassland birds, and survival during the non‐breeding season may have a strong influence on population trends of these species. Habitat loss and deterioration due to desertification may be contributing to these declines, and the winter ecology of grassland birds under these changing environmental conditions remains relatively unexplored. To fill this information gap, we estimated the survival of two grassland‐obligate sparrows, Baird's Sparrows (Ammodramus bairdii) and Grasshopper Sparrows (A. savannarum), on their wintering grounds in the Chihuahuan Desert, and investigated the role of habitat structure and weather on survival rates. We deployed radio‐transmitters on Baird's (N = 49) and Grasshopper (N = 126) sparrows near Janos, Chihuahua, and tracked birds from November to March during the winters of 2012–2013 and 2013–2014. Causes of mortality included avian predators, mammals, and possibly weather. We estimated an overall weekly winter survival probability of ŝ = 92.73% (95% CI[s] = 88.63–95.44%) for Baird's Sparrows in 2012–2013. We estimated a weekly winter survival probability of ŝ = 93.48% (95% CI[s] = 90.29–96.67%) and ŝ = 98.78% (95% CI[s] = 97.88–99.68%) for Grasshopper Sparrow in 2012–2013 and 2013–2014, respectively. Weekly winter survival was lower with colder daily minimum temperatures for both species and in areas with taller shrubs for Grasshopper Sparrows, with the shrubs potentially increasing predation risk by providing perches for Loggerhead Shrikes (Lanius ludovicianus). Our results highlight the need to maintain healthy grass structure in wintering areas to provide birds with food, protection from predators, and adequate cover from inclement weather. Our results also demonstrate that the presence of shrubs can lower winter survival, and suggest that shrub encroachment into the winter habitat of these sparrows may be an important driver of their population declines. Shrub removal could increase survival of wintering sparrows in the Chihuahuan Desert by reducing availability of perches for avian predators, thus reducing predation risk.

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Section: Discussionmentioning

confidence: 99%

“…This recipe for enhancing grassland bird habitat is well known, but its implementation requires new range management paradigms in the grasslands of northern Mexico and southwestern United States because overgrazing is still the norm and shrub encroachment continues (De León Mata et al. , Archer et al. ).…”

Section: Discussionmentioning

confidence: 99%

Winter survival of North American grassland birds is driven by weather and grassland condition in the Chihuahuan Desert

et al. 2017

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“…The vegetation consists mainly of induced pasture, natural grassland, microphyll desert scrub, chaparral areas and pine-oak forest. In each of these vegetation types, grass species of the genera Bouteloa, Aristida, Buchloe, Andropogon, Melinis, Muhlenbergia, Sporobolus, Heteropogon and Pleuraphis may be present [29,30]. …”

Section: Methodsmentioning

confidence: 99%

Mapping Land Cover and Estimating the Grassland Structure in a Priority Area of the Chihuahuan Desert

Rodríguez-Maturino

Martínez-Guerrero

Chairez-Hernández

et al. 2017

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Abstract:A field characterization of the grassland vegetation structure, represented by the coverage of grass canopy (CGC) and the grass height, was carried out during three years (2009)(2010)(2011) in a priority area for the conservation of grasslands of North America. Landsat Thematic Mapper (TM5) images were selected and the information of reflectance was obtained based on the geographical location of each field-sampling site. Linear models, constructed with field and satellite data, with high coefficients of determination for CGC (R 2 = 0.81, R 2 = 0.81 and R 2 = 0.72) and grass height (R 2 = 0.82, R 2 = 0.79 and R 2 = 0.73) were obtained. The maps showed a good level of CGC (>25%) and grass height (>25 cm), except for the year 2009, which presented the lowest values of grass height in the area. According to the Kappa Index, a moderate concordance among the three CGC maps was presented (0.49-0.59). Conversely, weak and moderate concordances were found among the grass height maps (0.36-0.59). It was observed that areas with a high CGC do not necessarily correspond to areas with greater grass height values. Based on the data analyzed in this study, the grassland areas are highly dynamic, structurally heterogeneous and the spatial distribution of the variables does not show a definite pattern. From the information generated, it is possible to determine those areas that are the most important for monitoring to then establish effective strategies for the conservation of these grasslands and the protection of threatened migratory bird species.

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“…En México se realizó un análisis de fragmentación mediante técnicas de percepción remota en el Área Prioritaria para la Conservación de Pastizales (APCP) denominada Cuchillas de la Zarca, mediante el uso de imágenes satelitales del programa Landsat TM y la obtención de métricas del paisaje de la zona. Una vez procesadas y generadas las clases de cobertura para las áreas en estudio, se importaron al software ArcGis y se generaron las métricas utilizando la extensión de análisis de fragmentación Patch Analysis, y finalmente se determinaron las áreas fragmentadas de las zonas mediante índices de evaluación paisaje (39). El uso de los índices para reconocer y evaluar los cambios de los patrones de distribución también fue usado en la Patagonia-Chile en un estudio de la pérdida y fragmentación del bosque nativo en la cuenca del río Aysén durante el siglo XX (58).…”

Section: Estudios De Casounclassified

“…las coberturas de la tierra(30,35,37) y mejora la caracterización de la heterogeneidad del paisaje describiendo los patrones espaciales de unidades ecosistémicas estructurales (distribución de coberturas vegetales)(38).Actualmente se realiza mediante sensores a bordo de satélites aerotransportados, representan un método de bajo costo y permiten evaluar grandes extensiones de terrenos o zonas remotas e inaccesibles(39), dichos sensores miden la cantidad de…”

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Análisis del proceso de fragmentación de bosques: metodologías orientadas en el uso de sistemas de información geográfica y métricas del paisaje

et al. 2019

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El presente artículo de revisión busca describir la fragmentación de bosques desde un enfoque conceptual y explorar las metodologías implementadas para su estudio a nivel nacional e internacional, principalmente, orientadas al uso de sistemas de información geográfica y diferentes métricas para la caracterización del paisaje. Para ello se realizó la revisión de artículos científicos relacionados con la fragmentación de bosques, análisis espacial y multitemporal. Mostrando el valor único y eficacia en la evaluación de las dinámicas del proceso de fragmentación, que tienen el uso de Sistemas de Información Geográfica, junto con los índices y el análisis de factores económicos, políticos y sociales dentro de un área de estudio.

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Aplicación De Sensores Remotos en El Análisis De La Fragmentación Del Paisaje en Cuchillas De La Zarca, México

Cited by 16 publications

References 0 publications

Winter survival of North American grassland birds is driven by weather and grassland condition in the Chihuahuan Desert

Winter survival of North American grassland birds is driven by weather and grassland condition in the Chihuahuan Desert

Mapping Land Cover and Estimating the Grassland Structure in a Priority Area of the Chihuahuan Desert

Análisis del proceso de fragmentación de bosques: metodologías orientadas en el uso de sistemas de información geográfica y métricas del paisaje

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