CONSEQUENCES OF REMOVING LARGE PREDATORS FROM NATURE:
A cascade of failing ecosystems
Review Article: Trophic Downgrading of Planet Earth
James A. Estes, John Terborgh, et al.
"Modern extinctions are largely being caused by a single species, Homo sapiens. From its onset in the late Pleistocene, [this] sixth mass extinction has been characterized by the loss of larger-bodied animals in general and of apex consumers in particular."
[1] "The loss of apex consumers is arguably humankind’s most pervasive influence on the natural world. This is true in part because it has occurred globally and in part because extinctions are by their very nature perpetual, whereas most other environmental impacts are potentially reversible on decadal to millenial time scales."
[2] "The omnipresence of top-down control in ecosystems is not widely appreciated because several of its key components are difficult to observe. The main reason for this is that species interactions, which are invisible under static or equilibrial conditions, must be perturbed if one is to witness and describe them. Even with such perturbations, responses to the loss or addition of a species may require years or decades to become evident."
[3] "Recent research suggests that the disappearance of these animals reverberates further than previously anticipated, with far-reaching effects on processes as diverse as the dynamics of disease; fire; carbon sequestration; invasive species; and biogeochemical exchanges among Earth’s soil, water, and atmosphere."
Science 15 July 2011: Vol. 333 no. 6040 pp. 301-306