Monitoreo de cambios en la densidad de cobertura forestal en bosque templado usando fotografías aéreas digitales de alta resolución

López-García, José; Molina, Jorge Prado; Manzo-Delgado, Lilia de Lourdes; Higuera, Armando Peralta

doi:10.14350/rig.47360

Cited by 7 publications

(8 citation statements)

References 29 publications

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“…The monarch butterfly is a fascinating research organism because of its peculiar migration pattern and its unique yearly life cycle. Recent concerns about the viability and conservation of the sanctuaries in Mexico have been pointed out [ 39 , 45 ]. A statistically significant decline in monarch butterfly colonies has been documented [ 43 ].…”

Section: Discussionmentioning

confidence: 99%

Characterizing New Wintering Sites for Monarch Butterfly Colonies in Sierra Nevada, Mexico

Miranda¹,

Padilla²,

Sánchez³

2020

Insects

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Every year, Danaus plexippus (Linnaeus, 1758) travels to hibernate in oyamel fir forests located between the limits of the states of Michoacán and Mexico in Mexico. Climate change and anthropogenic actions are diminishing oyamel fir forests in Mexico, putting pressure on the habitats of monarch butterflies. In the last decade, new colonies outside their usual range have been predicted through modeling and reported by the National Commission on Protected Areas of Mexico. The objectives of the study were to recover information on the historical and new hibernation sites, reported or modeled, from different literature sources. We also aimed to perform a bioclimatic and forest biometric characterization of new monarch butterfly colonies located in Sierra Nevada in Mexico to provide information to aid in conservation strategies for the monarch butterfly population. We conducted field trips to georeference the colonies at sites located in the Atlautla municipality in Mexico State. Climatic, topographic, and forest biometric variables were used to characterize the sites physically. It was found that the butterfly’s roosts occurred at a higher elevation than those recorded by other sources. The locations where the monarch’s colonies were established, in the east of Mexico State, provide information relevant to defining and developing policies for their conservation.

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Section: Discussionmentioning

confidence: 99%

Characterizing New Wintering Sites for Monarch Butterfly Colonies in Sierra Nevada, Mexico

Miranda¹,

Padilla²,

Sánchez³

2020

Insects

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“…Multitemporal analysis using orthophotographs and Spot-7 images allows a detailed comparative visual interpretation at a scale of 1:5000; this enables accurate determination of the processes of change in the forest cover in a NPA and its area of influence. This method is similar to those used in analyses performed in the Monarch Butterfly Biosphere Reserve, where only aerial photographs were used (López-García, 2011;López-García et al, 2016;Manzo-Delgado et al, 2014;Vidal et al, 2014). However, it has the advantage of combining two products of similar spatial resolution but of different origin and date, to achieve an adequate multi-temporal comparison with the support of geographic information systems.…”

Section: Discussionmentioning

confidence: 99%

“…A minimum mapping area of 5000 m 2 was used, based on the definition of forest for forest cover (FAO, 2010), and at least 625 m 2 for deforested or non-forest areas (López-García et al, 2016).…”

Section: Methodsmentioning

confidence: 99%

“…Studies that evaluate the change in density of forest cover in NPAs are scarce, particularly at a scale of 1:5000 and using orthophotographs and Spot images through visual interpretation. For the Monarch Butterfly Biosphere Reserve, Mexico, photointerpretation has assessed disturbance and recovery for four periods between 1971 and 2013 (Manzo-Delgado, López-García, & Alcántara-Ayala, 2014) and has recorded separate processes of disturbance (López-García, 2011;López-García, Prado-Molina, Manzo-Delgado, & Peralta-Higuera, 2016;Vidal, López-García, & Rendón-Salinas, 2014).…”

Section: Study Areamentioning

confidence: 99%

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Changes in forest cover in Sierra Nevada, Mexico, 1994–2015

López-García

2019

Journal of Maps

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Sierra Nevada, 153,437 ha, has the second and third highest mountains in Mexico and the most conserved coniferous forests of central Mexico. It comprises the Los Volcanes Biosphere Reserve, designated by UNESCO in 2010. A map was produced at 1:100,000 scale. Recent changes in forest cover were identified by visual interpretation of orthophotographs from 1994 and Spot 7 images from 2015. Changes were detected in forest cover density (closed, semi-closed, semi-open, open or deforested), together with a non-forest category that includes other land uses. Over the 21 years, 25% of the forest had undergone change: 14% recovery and 11% disturbance. Recovery outweighed disturbance in the Protected Areas, with possible factors being payment for environmental services, periodic reforestation and fire control. Outside this protected area, improvement outweighed degradation, mainly because of forestry programs. Overall in the Sierra Nevada, the trend appears to be forest recovery.

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“…The forest cover density was digitized by visual interpretation of the orthophotomosaic at a 1:5000 scale on a PC screen, using ArcGis 10.2.2, for which the photointerpretation elements of the image were taken into account, such as tone, texture, shape, design and the relationship with other objects. Six categories of forest cover were recognized, five by density of forest cover, according to tree density: closed canopy (> 75%), semi-closed (51-75%), semi-open (26-50%), open (10-25%) (López-García et al 2016) and deforested (< 10%) (FRA 2000); the sixth category, non-forest, was represented by agriculture, pastures, and human settlements. A minimum mapping area of 5000 m 2 was used for forest cover, based on the definition of forest (FRA 2000), and at least 625 m 2 for deforested or non-forested areas (López-García et al 2016).…”

Section: Delimitation By Density Of Forest Covermentioning

confidence: 99%

Changes in the constituents of the “Bosque de Agua” of the Sierra Cruces-Ajusco-Chichinautzín, Mexico, an area with payment for environmental services

López-García

Navarro-Cerrillo

2021

Environ Earth Sci

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The "Bosque de Agua", to the west and south of Mexico City, which is the fifth largest city in the world, has historically suffered disturbances in forest cover, with a consequent reduction in the environmental services provided. Changes in the state of the forests between 1994 and 2017 are here analyzed in terms of the annual net change in area of the different cover densities and the different change processes. In general, the net change was favorable in all cases: forest improvement vs. forest degradation, reforestation vs. deforestation, and afforestation vs. land use change. There were changes in 16.03% of the Bosque de Agua: recovery in 11.09% and disturbance in 4.94%. This marked recovery is the result of the protected status of two-thirds of the forest, the payment for hydrological environmental services in 29.33% of the forest, as of 2003, and the continuous programs of reforestation, fire control and surveillance by the local communities, circumstances that have allowed the recovery to exceed the disturbance in most of the Bosque de Agua. One-third of the forest disturbance is concentrated in six of the 35 municipalities in the southern region, caused by clandestine logging by organized gangs, due to the state of ungovernability that reigns in these municipalities.

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Monitoreo de cambios en la densidad de cobertura forestal en bosque templado usando fotografías aéreas digitales de alta resolución

Cited by 7 publications

References 29 publications

Characterizing New Wintering Sites for Monarch Butterfly Colonies in Sierra Nevada, Mexico

Characterizing New Wintering Sites for Monarch Butterfly Colonies in Sierra Nevada, Mexico

Changes in forest cover in Sierra Nevada, Mexico, 1994–2015

Changes in the constituents of the “Bosque de Agua” of the Sierra Cruces-Ajusco-Chichinautzín, Mexico, an area with payment for environmental services

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