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Table 1 Description of the fragmentation metric parameters analysed according to McGarigal and Marks (1995) and Leautaud Valenzuela (2014)

From: Deforestation and fragmentation trends of seasonal dry tropical forest in Ecuador: impact on conservation

Parameter Abbreviation Definition Unit
Number of Patches NumP Total number of patches inside the tiles. The more patches there are, the more fragmented the forest is considered to be. Number
Mean patch size MPS The average patch size of the forest within the tile.
A smaller average forest patch size is considered indicative of a more fragmented forest.
km2
Median patch size MedPS The middle patch size, or 50th percentile of the forest patches inside the tile.
Median patch size can hide the presence of very large or very small patches.
km2
Total edge TE Perimeter of patches within each tile. The greater the perimeter, the more exposed to disturbances. Greater TE patch may be associated with more fragmented forests (if the fragmentation is related to an anthropogenic disturbance) km
Edge density ED Amount of edge (km) relative to the forest area (km2) within the tile.
ED = TE/Forest area within the tile
A high ratio of perimeter to forest patch area may be associated with more fragmented forests (if fragmentation is related to anthropogenic disturbance).
km·km−2
Edge density percentage ED Edge percentage relative to landscape area.
A high ratio of perimeter to forest patch area may be associated with more fragmented forests (if fragmentation is related to anthropogenic disturbance).
Percentage
Percentage without forest PSB Non-forest area (%) without forest within the tile.
Higher percentage of area without forest within the tile would indicate greater fragmentation.
Percentage
Reticular fragmentation index RFI Reticular fragmentation index of each tile.
RFI = (PSB% + ED%)/2
A higher RFI signifies a greater percentage of fragmentation within the tile.
Percentage