[align=justify][box_out][box_in] PassageA
Until recently, conservationists were often complacent about the effect of nonindigenous plant and animal species on the ecosystems they invade. Many shared Charles Elton’s view, introduced in his 1958 book on invasive species, that disturbed habitats are most vulnerable to new arrivals because they contain fewer or less vigorous native species. Now, however, ecologists realize that when humans introduce new species into existing ecosystems, even pristine, species-rich
...
Until recently, conservationists were often complacent about the effect of nonindigenous plant and animal species on the ecosystems they invade. Many shared Charles Elton’s view, introduced in his 1958 book on invasive species, that disturbed habitats are most vulnerable to new arrivals because they contain fewer or less vigorous native species. Now, however, ecologists realize that when humans introduce new species into existing ecosystems, even pristine, species-rich
...
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