And what is it that motivates people to persevere in a common cause or mission? Values, of course, especially when they are understood, shared by, and reflected in their leaders. This article examines the role of leadership in culture change, the kinds of change needed to promote reform in our health care system. Culture.
Cane toads (Bufo marinus) originally came from Mexico, Central America, and South America. They ranged from the Rio Grande to the Amazon basin. They have been introduced to many islands in the Caribbean and Pacific, to Florida, Japan, and Papua New Guinea.
(Image: Ian Waldie/Getty). The toxic cane toad introduced to Australia in the 1930s is causing ripples through the ecosystem in ways rarely seen when invasive species spread. We know that toads poison their predators, but this seems to allow other prey species to bounce back.It is a rare piece of solid evidence for an invasive species causing what is called a âtrophic cascadeâ in the wild, researchers say, where killing off top predators has unexpected effects throughout an ecosystem.he toxic cane toad introduced to Australia in the 1930s is causing ripples through the ecosystem in ways rarely seen when invasive species spread.