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consequences for host-parasitoid interactions of grazing-dependent habitat heterogeneity.1. environmental heterogeneity can produce effects that cascade up to higher trophic levels and affect species interactions. we hypothesized that grazing-dependent habitat heterogeneity and grazing-independent host plant heterogeneity would influence directly and indirectly a host-parasitoid interaction in a woodland habitat. 2. thistles were planted randomly in 20 birch woodlands, half of which are grazed by cattle. the abundances of two species of seed herbivore and their shared parasitoid wer ...200616689961
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