![]() ![]() The indirect impacts of hybridization on biodiversity may exceed the direct impacts and may result in “apparent” herbivore resistance or susceptibility at the community level. (8) The effects of hybridization on common or keystone species can either positively or negatively affect biodiversity. (7) Including multiple trophic levels and taxa from microbes to vertebrates, susceptible hybrid genotypes support greater biodiversity than resistant genotypes. (6) Even nesting birds respond to hybridizing plants. ![]() (5) Plant hybrid zones may represent essential habitat for some arthropod species. (4) Generalist and specialist herbivores predictably vary in their responses to hybrids. (3) The communities associated with different hybrid classes can differ from one another as well as from their parental species. (2) As a reflection of this genetic variation, herbivores are more likely to differentiate between hybrid classes than they are to differentiate between pure plant species. backcrosses) may equal or even exceed that found between species. (1) Genetic variation between classes of hybrids (e.g., F 1’s vs. These studies suggest that genetic-based plant traits affect the distribution of many species and that the variation in hybrids can be used as tools to examine the genetic components of community structure and biodiversity. Thus, most taxa respond to hybrids in ways that result in equal or greater abundance, and hybrids tend to accumulate the taxa of their parent species. In an updated review of 152 case studies of taxa associated with diverse hybridizing systems, there were 43 (28%) cases of hybrids being more susceptible than their parent species, 7 (5%) resistant, 35 (23%) additive, 35 (23%) dominant, and 32 (21%) showed no response to hybridization. Studies in the wild and in gardens with synthetic crosses showed that hybrid eucalypts supported the greatest species richness and abundances of insect and fungal taxa. ![]() Plant hybrid zones are dynamic centers of ecological and evolutionary processes for plants and their associated communities. ![]()
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