In areas of high wolf density and declining prey populations, the major causes of death are killing by other wolves and starvation.
Cheetah (Acinonyx jubatus) populations have dramatically declined due to habitat loss and fragmentation, declining prey base, conflict with livestock and farmed game, and illegal trade.
Deforestation, ecosystem homogenization, and diversity loss are frequent problems in tropical livestock systems, which can foster substantial human-wildlife conflict when wild carnivores with declining prey bases turn to cattle depredation.
It has been suggested that the impact of predator control on declining prey species may not be sufficient to reverse the trend, and prey that are increasing in abundance will continue to do so [7].
Uncontrolled numbers rapidly lead to a decline in prey birds, as shown by a famous trial, the Joint Raptor Study [JRS], undertaken on Langholm Moor in the 1990s, which recorded what happens when grouse and raptors are allowed to co-exist without interference.
Amoeba may have been documented to cause a decline of prey bacteria in nature from 108 to 105 cells per gram of soil.
Unfortunately, there are few data available to assess whether there has been a widespread and long-term decline in prey availability that coincides with the patterns I detected.
Between 1920 and 1970, tiger populations throughout Central Asia declined and disappeared for reasons common to tigers elsewhere: hunting, conversion of their limited habitat to cultivation with a concomitant decline in prey, and conflict with livestock [1], [4] [6].
In spite of its wide distribution, the pampas cat is one of the less known felids [ 21] and its status is affected by a variety of threats, comprising habitat loss and fragmentation, hunting for traditional reasons and decline of prey populations [ 22, 23].
There is always a chance, perhaps obscured by the daunting fact of so many beachgoers, that some new pressure on sharks, like a decline in natural prey, is driving them inshore.
