“Biological Annihilation”
Extinction starts to have an effect on ecosystems long before a species fully disappears. A new paper calls this “biological annihilation” — the effect that localized extinction has on a region when certain species, such as lions, become extirpated from their former habitats. The paper argues we should pay more attention to species even if they are considered “of low concern,” because many of them are actually in decline. Although these species are not currently considered threatened with extinction, their “population decay” causes cascading effects on the abundance of other local species — which, the paper warns, will eventually result in yet more extinctions.