Summary: Journal of Animal
© 2006 The Authors.
© 2006 British
Blackwell Publishing Ltd
Contrasting cascades: insectivorous birds increase pine but
not parasitic mistletoe growth
KAILEN A. MOONEY* and YAN B. LINHART
University of Colorado, Department Ecology and Evolutionary Biology, Boulder, CO 80309-0334, USA
1. Intraguild predation occurs when top predators feed upon both intermediate
predators and herbivores. Intraguild predators may thus have little net impact on her-
bivore abundance. Variation among communities in the strength of trophic cascades
(the indirect effects of predators on plants) may be due to differing frequencies of
in predatorpredator interactions upon trophic cascade strength.
2. We compared the effects of a single predator community between two sympatric