Effects of habitat suitability and minimum patch size thresholds on the assessment of landscape connectivity for jaguars in the Sierra Gorda, Mexico

2016 ◽  
Vol 204 ◽  
pp. 296-305 ◽  
Author(s):  
Carlos Ramirez-Reyes ◽  
Brooke L. Bateman ◽  
Volker C. Radeloff
Keyword(s):  
Habitat Suitability ◽  
Patch Size ◽  
Landscape Connectivity ◽  
Minimum Patch Size

scholarly journals Habitat suitability vs landscape connectivity determining roadkill risk at a regional scale: a case study on European badger (Meles meles)

2019 ◽  
Vol 65 (1) ◽  
Author(s):  
Mauro Fabrizio ◽  
Mirko Di Febbraro ◽  
Marcello D’Amico ◽  
Ludovico Frate ◽  
Federica Roscioni ◽  
...  
Keyword(s):  
Habitat Suitability ◽  
Landscape Connectivity ◽  
Regional Scale ◽  
Meles Meles ◽  
European Badger

scholarly journals Effect of land use, habitat suitability, and hurricanes on the population connectivity of an endemic insular bat

2020 ◽  
Author(s):  
Camilo A. Calderón-Acevedo ◽  
Armando Rodríguez-Durán ◽  
J. Angel Soto-Centeno
Keyword(s):  
Land Use ◽  
Puerto Rico ◽  
Habitat Suitability ◽  
Landscape Connectivity ◽  
Population Connectivity ◽  
Suitable Habitat ◽  
Population Declines ◽  
Forest Patches ◽  
Continuous Forest ◽  
Forested Areas

AbstractHabitat loss and fragmentation are a leading cause of vertebrate population declines and extinction. Urbanization and natural disasters disrupt landscape connectivity, effectively isolating populations and increasing the risk of local extirpation particularly in island systems. Puerto Rico, one of the most isolated islands in the Caribbean, is home to 13 bat species that have been differentially affected by disturbance during the Anthropocene. We used circuit theory to model the landscape connectivity within Puerto Rico with the goal of understanding how fragmentation affects corridors among forested areas. Models combined species occurrences, land use, habitat suitability, and vegetation cover data to examine connectivity in the endemic bat Stenoderma rufum, and also at the bat community level across the island. Urbanization in Puerto Rico affected bat connectivity overall from east to west and underscored protected and rustic areas for the maintenance of forest corridors. Suitable habitat provided a reliable measure of connectivity among potential movement corridors that connected more isolated areas. We found that intense hurricanes can disrupt forest integrity and affect connectivity of suitable habitat. Some of the largest protected areas in the east of Puerto Rico are at an increasing risk of becoming disconnected from more continuous forest patches. The disruption of corridors that maintain connectivity on the island could explain previous findings of the slow post-hurricane population recovery of S. rufum. Given the increasing rate of urbanization, this pattern could also apply to other vertebrates not analyzed in this study. Our findings show the importance of maintaining forest integrity, emphasizing the considerable conservation value of rustic areas for the preservation of local biodiversity.

scholarly journals Satellite mapping of gorse at regional scales

2002 ◽  
Vol 55 ◽  
pp. 95-98 ◽  
Author(s):  
J.D. Shepherd ◽  
W.G. Lee
Keyword(s):  
Spatial Distribution ◽  
Patch Size ◽  
Percent Cover ◽  
Error Assessment ◽  
Mapping Accuracy ◽  
Spectral Bands ◽  
Random Samples ◽  
Minimum Patch Size ◽  
Target Management ◽  
Landsat Satellite

The spatial distribution of gorse in the Wellington Region was mapped using Landsat satellite imagery This satellite is capable of mapping at regional scales (150 000) with a large spatial extent (180 km x 180 km) and has spectral bands in both the visible and infrared parts of the spectrum (6 bands in total) A spring Landsat image distinguished flowering gorse enabling mapping of gorse as a separate scrub type We chose a minimum patch size of 05 ha with a boundary precision of 15 m An error assessment using 1200 stratified random samples across the Wellington region compared the satellite classified result with colour aerial orthophotography and found the mapping accuracy of gorse to be 95 Gorse area by catchment was calculated using an existing GIS of catchment boundaries The area and percent cover of gorse within a catchment is a potential way to target management at regional scales

scholarly journals Global patterns of fragmentation and connectivity of mammalian carnivore habitat

2011 ◽  
Vol 366 (1578) ◽  
pp. 2642-2651 ◽  
Author(s):  
Kevin R. Crooks ◽  
Christopher L. Burdett ◽  
David M. Theobald ◽  
Carlo Rondinini ◽  
Luigi Boitani
Keyword(s):  
Habitat Suitability ◽  
Lower Risk ◽  
Landscape Connectivity ◽  
Extinction Risk ◽  
Negative Relationship ◽  
Habitat Isolation ◽  
High Quality ◽  
Carnivore Conservation ◽  
Risk Of Extinction ◽  
Global Patterns

Although mammalian carnivores are vulnerable to habitat fragmentation and require landscape connectivity, their global patterns of fragmentation and connectivity have not been examined. We use recently developed high-resolution habitat suitability models to conduct comparative analyses and to identify global hotspots of fragmentation and connectivity for the world's terrestrial carnivores. Species with less fragmentation (i.e. more interior high-quality habitat) had larger geographical ranges, a greater proportion of habitat within their range, greater habitat connectivity and a lower risk of extinction. Species with higher connectivity (i.e. less habitat isolation) also had a greater proportion of high-quality habitat, but had smaller, not larger, ranges, probably reflecting shorter distances between habitat patches for species with restricted distributions; such species were also more threatened, as would be expected given the negative relationship between range size and extinction risk. Fragmentation and connectivity did not differ among Carnivora families, and body mass was associated with connectivity but not fragmentation. On average, only 54.3 per cent of a species' geographical range comprised high-quality habitat, and more troubling, only 5.2 per cent of the range comprised such habitat within protected areas. Identification of global hotspots of fragmentation and connectivity will help guide strategic priorities for carnivore conservation.

Landscape attributes determine bobcat (Lynx rufus escuinapae) presence in Central Mexico

Mammalia ◽  
2017 ◽  
Vol 81 (1) ◽  
Author(s):  
María Eugenia Espinosa-Flores ◽  
Carlos A. López-González
Keyword(s):  
Patch Size ◽  
Camera Traps ◽  
Lynx Rufus ◽  
Tree Cover ◽  
Central Mexico ◽  
Anthropogenic Pressure ◽  
Landscape Characteristics ◽  
Breeding Populations ◽  
Minimum Patch Size

AbstractCentral Mexico has experienced a decline of its natural vegetation due to anthropogenic pressure. In 12 sites in the southeastern portion of Guanajuato, we deployed camera traps and analyzed landscape characteristics. We recorded the presence of bobcats in four sites. Their presence was explained by a combination of patch size and tree cover. Because bobcats are sensitive to fragmentation and habitat loss, it is essential to increase sampling and conservation efforts to define the minimum patch size and maximum area of human development that can limit their long-term persistence and the establishment of breeding populations.

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