Résultat de la recherche
13 recherche sur le mot-clé
'genetic variation' 


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J. Ferrari ; C. Muller ; A. Kraaijeveld ; H. Godfray | 2001The potential rate of evolution of resistance to natural enemies depends on the genetic variation present in the population and any trade-offs between resistance and other components of fitness. We measured clonal variation and covariation in pe[...]![]()
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J. Sandstrom ; J. Pettersson | 1994The performance of five clones of the pea aphid, Acyrthosiphon pisum, was evaluated on red clover, Trifolium pratense, alfalfa, Medicago sativa, broad bean, Vicia faba and five genotypes of pea, Pisum sativum. Phloem sap samples were collected f[...]![]()
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L. Wilhoit ; T. Mittler | 1991![]()
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S. Via | 1989![]()
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J. Sandstrom | 1994The performance of one clone of the pea aphid, Acyrthosiphon pisum (Harris), was assessed on 37 different cultivars and species of Pisum L. In addition, random samples of 36 pea aphid clones collected on alfalfa and clover were tested on a selec[...]![]()
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P. Debarro ; T. Sherratt ; O. David ; N. Maclean | 1995Individuals of the grain aphid Sitobion avenae were collected from wheat and cocksfoot stands around Hampshire, UK, during March and April 1994. Eight wheat and eight cocksfoot aphid clones were chosen on the basis of readily distinguishable RAP[...]![]()
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Phenotypic evolution in contemporary populations can generally be witnessed only when novel selective forces produce rapid evolution. Examples of conditions that have led to rapid evolution include drastic environmental change, invasion of a new[...]![]()
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J. Sandstrom | 19961. Temporal changes in host adaptation were followed in a local population of the pea aphid, Acyrthosiphon pisum. Aphid clones were collected in one alfalfa and one clover field at three different times. In the spring, first-generation females w[...]![]()
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P. Sunnucks ; D. Chisholm ; E. Turak ; D. Hales | 1998The aim of this study was to test whether host plant responses of Sitobion aphids have evolved under parthenogenesis and to examine the relationship between genetic and phenotypical similarity. There are four known chromosomal races of Australia[...]![]()
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E. Bernays ; D. Funk | 2000Uroleucon ambrosiae collected from the eastern and the southwestern United States were studied in relation to host-plant probing. In the field, eastern aphids are highly specific on Ambrosia trifida, while southwestern aphids feed on Ambrosia tr[...]