However, increasing parasitoid dispersal disrupts the synchronising effects of host dispersal, driving negative correlation between host populations.
This suggests that GI parasites exert stronger selective pressure at the gene locus in question than do ectoparasites, with GI parasites having higher fitness costs to hosts and likely driving host immune allocation in this system.
The use of different hosts imposes divergent selection pressures on parasitoid populations through fitness trade-offs related to the use of different hosts, thus driving local adaptation of parasitoid populations to their natal host (Kawecki and Ebert 2004).
Therefore, the density and relative abundance of lower-competence hosts is more important than the mere presence/absence of lower-competence hosts in driving this mechanism.
Anemone fishes serve their hosts by driving away fishes that prey on anemones.
Our hosts were driving their small herd of horses home from the pasture.
Mr. Schumer, an acquaintance of Donald J. Trump, the show's host and driving spirit, said that his appearance on the show came about after a conversation with one of its producers.
Asda has also tried letting community groups use spare space for dance lessons and scout groups and even hosted a driving test centre and provided rooms for midwives and police officers.
He is the host and driving force behind "Hotel Impossible," a new show on the Travel Channel, and fixing what ails hotels is a skill he has been honing over decades in the industry.
The deal includes customized commercials for television and the Web, under the rubric "Travel Channel's Road to the Unexpected," featuring a Travel Channel host, Don Wildman, driving Land Rovers in Bolivia, Britain, Jamaica and Quebec, and accompanying teasers — yes, commercials for commercials — to promote the spots.
