The careful targeting of this ad to coal-mining areas, and the use of a cheaper medium, radio, reflects the strategy used by both Romney and Obama supporters of identifying "niche" issues of importance to relatively small, but important segments of the electorate in the nine to fourteen states that will hold the balance of power in 2012.
Thus all studies suggest an importance of niche differentiation/differential selection in shaping the composition of hybrid populations, although the frozen niche variation model was not better supported than the non-niche-based general purpose model.
In contrast to most previous studies that have suggested the importance of niche conservatism in setting range limits and creating biogeographic patterns (e.g., [ 70, 71]), niche evolution under climatic changes seems to be the major factor explaining the biogeographic patterns detected here.
From this point of view, the Internet seems to have further boosted the importance of niche criminal markets.
This approach will be useful for functional study of the importance of niche factors in normal and malignant human hematopoiesis.
Under normal conditions, the repertoire and function of cytokines in the satellite cell niche vary, highlighting the importance of investigating the combined effects of cytokines.
Ken Weiss emphasized this in a discussion of the importance of niche construction and behavior-driven evolution when he concluded that "local divergence can be achieved by behavioral sorting by which organisms find or modify local niches according to their abilities, but this need not involve fitness differences nor even be based on genetic inheritance" (Weiss 2004, p. 203).
Our results highlight the importance of niche occupation as a constraint on adaptive radiation.
The regulation of HSC quiescence in the bone marrow (BM) niche is of particular importance [1], [2].
Our results highlight the importance of niche occupation in determining the breadth of adaptive radiation attainable by an invading lineage.
