One caveat to this is if you have a very distinct niche market, or you have a fairly established email list in place. (lulu.com)
She estimates there are more than 700 species of commensal mouth bacteria, all living in distinct niches in about 33 square inches of the oral cavity, as dentists call it. (discovermagazine.com)
Mats of algal «turf», which create fewer distinct niches, had moved in instead (Nature Climate Change, DOI: 10.1038 / nclimate1627). (newscientist.com)