There are many local fragmentation metrics, but most can be grouped into four types (composition/area, isolation, edge, and shape), none of them alone determines the degree a patch. Here, we together main metrics (area, shape, isolation) in order to propose new metric/index, Patch Fragmentation Index (PFI), with which determine at patch scale. The index was subsequently verified Ecuadorian seas...

abstract competition is a phenomenon that influences the size, structure and stability of insect communities, particularly on solitary endoparasitoids species. although, competition normally incurs costs, it might be adaptive for the surviving individual. to determine which factors affect the patch use strategy of foragers under competition, the effect of previous experience with hosts already-...