« Previous AbstractA novel system for intensive Diadema antillarum propagation as a step towards population enhancement    Next AbstractThe development of substitute inks and controls for reducing workplace concentrations of organic solvent vapors in a vinyl shower curtain printing plant »

Evolution

Title:		Aphid Distribution and the Evolution of Goldenrod Resistance
Author(s):		Pilson D;
Address:		"Department of Zoology, Duke University, Durham, NC, 27706, USA"
Journal Title:		Evolution
Year:		1992
Volume:		46
Issue:		5
Page Number:		1358 - 1372
DOI:		10.1111/j.1558-5646.1992.tb01129.x
ISSN/ISBN:		1558-5646 (Electronic) 0014-3820 (Linking)
Abstract:		"Although there is considerable evidence indicating that herbivory is detrimental to plant fitness, some recent studies of the evolution of plant resistance have concluded that insects do not impose selection on their host plants. A previously untested assumption that underlies most studies of the evolution of plant resistance is that insect distribution patterns are controlled directly by the effects of plant genotype on insect preference and performance. The experiments described here explicitly tested this assumption using the specialist herbivore Uroleucon tissoti (Homoptera: Aphididae) and its host plant Solidago altissima (Asteraceae). Measures of aphid preference and performance were used to predict aphid distribution patterns, and then the predicted distribution patterns were compared with the natural distribution pattern. Although goldenrod genotype had a strong effect on aphid distribution, aphid distribution was not controlled directly by the effect of goldenrod genotype on aphid preference and performance. Instead, a second experiment demonstrated that aphid and spittlebug (Philaenus spumarius and Lepyronia quadrangularis Homoptera: Cercopidae) distribution is controlled largely by genetic variation for resistance to a suite of 'branch-causing' herbivores. These herbivores induce branching and aphids and spittlebugs are more abundant on branched plants than unbranched plants. These results indicate that any natural selection imposed by aphids and spittlebugs on goldenrod will depend on the presence or absence of branch-causing herbivores. Thus, selection for plant resistance may depend as much on the assemblage of insect species present as on the identity of each individual species"
Keywords:		Herbivore distribution Lepyronia quadrangularis Philaenus spumarius Solidago altissima Uroleucon tissoti herbivore interactions herbivore performance herbivore preference plant resistance;
Notes:		"PubMed-not-MEDLINEPilson, Diana eng 1992/10/01 Evolution. 1992 Oct; 46(5):1358-1372. doi: 10.1111/j.1558-5646.1992.tb01129.x"