A third introduces readers to the latest threat to Louisiana's coast, an aphid-like insect that, along with nutria and feral hogs, is destroying the vegetation essential to keeping the wetlands from dissolving.
Small animals are picked off by feral pests, land is denuded of vegetation as herbivore numbers increase and streams and rivers are even diverted as a result of this loss of carnivores, the ecologists found.
On Sweet Juniper, Griffioen has posted a number of ruin shots: "feral" houses almost completely overgrown with vegetation; a decommissioned public-school book depository in which trees were growing out of the piles of rotting textbooks.
Starting next spring, they plan to remove an estimated 1,000 nonnative feral pigs that have damaged island vegetation.
The changes in vegetation that result when feral horses overpopulate a region affects bird species by removing plants upon which they feed, as well as altering the habitat of the birds and their prey.
The repatriation is only part of the story: the increase in numbers is also because of an initiative in which aerial sharpshooters were enlisted to thin the population of nonnative feral goats, which graze on the same vegetation as tortoises.
He was said to have lived an entirely feral existence – walking on all fours and eating forest vegetation – before being brought to Britain by Caroline of Ansbach, the wife of King George II.
Damage to the natural levees that separate freshwater and saline wetland communities caused by climate change and by feral animals (especially water buffalo) may also change the vegetation.
It is more secure in its northern habitat as the land is mostly unsuitable for farming and much of it is in national parks or private ownership, but changes in vegetation cover, encouraged by the rooting activities of feral pigs, may reduce the abundance of bulkuru sedge and may make the brolga more vulnerable by providing cover for predators.
Notable responses by floodplain vegetation have already occurred following the removal of feral buffalo (Skeat et al., 1996).
