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Ecology, 84(8), 2003, pp. 20832091 2003 by the Ecological Society of America
 

Summary: 2083
Ecology, 84(8), 2003, pp. 20832091
2003 by the Ecological Society of America
HOST SPECIES AFFECTS HERBIVORY, POLLINATION, AND
REPRODUCTION IN EXPERIMENTS WITH PARASITIC CASTILLEJA
LYNN S. ADLER1
Department of Biology, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061 USA
Abstract. The relative performance of a parasitic plant on different host species will
depend on both direct and indirect effects of hosts on parasite interactions with mutualists
and antagonists. Host species could affect parasite interactions with both herbivores and
pollinators due to the uptake of defensive compounds and nutrients. However, the effects
of different host species on parasitic plants have not been experimentally tested in the field.
I determined the effect of two native host species, an alkaloid-producing, nitrogen-fixing
lupine and non-alkaloid, non-nitrogen-fixing grass, on herbivory, pollination, and repro-
duction of the hemiparasitic plant Indian paintbrush (Castilleja indivisa). Within this ex-
periment, I manipulated herbivory and pollination to determine their effects on Indian
paintbrush reproduction. Indian paintbrush parasitizing lupines produced three times as
many seeds and were more attractive to pollinators than Indian paintbrush parasitizing
grass. However, there was no effect of host species on early season or floral herbivory. In
addition, MANOVA revealed that host species influenced the response of Indian paintbrush

  

Source: Adler, Lynn - Department of Plant, Soil and Insect Sciences, University of Massachusetts at Amherst

 

Collections: Environmental Sciences and Ecology