Habitat heterogeneity can be maintained or increased through the mechanisms we have discussed above fire, bomas, and altering tree cover but only if the location, and ideally size and spacing, of these impacts varies in space and time.
What feature of genetically altered trees will be appealing to the public, according to tree geneticists?
That suggests that the altered trees are indeed emitting the mercury, he said.
What will make Dr. Yan Linhart believe in the power of genetically altered trees?
Tree geneticists are acutely aware that public acceptance will depend at least partly on whether altered trees can be made sterile or their reproductive capacity tightly controlled.
Tests conducted by Mr. Varekamp and his students found that the leaves of the genetically altered trees contain less mercury than the naturally occurring trees.
Within the last year, activists have also vandalized a university lab in Minnesota and torched a research site belonging to Boise Cascade, the giant paper company, which had been experimenting with genetically altered trees.
City or country, that sundown hour is strange and exhilarating, as ordinary spatial relations are altered: trees rear up in their own shadows, buildings bulk out, pavements stretch forward, the red wrapper of brake lights turns a road into a lava flow.
