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19 recherche sur le mot-clé
'herbivory' 
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A. Agrawal | 1999Induced responses to herbivory are changes in plant quality following initial damage by herbivores. These changes can negatively affect subsequent herbivores. I studied induced responses in annual wild radish plants, Raphanus raphanistrum and R.[...]
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J. Maron | 1998Understanding of the selective effects of insect herbivory on plants comes primarily from studies of herbivory aboveground. The impact of belowground herbivory, either in isolation or in concert with herbivory aboveground, on plant fitness is on[...]
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P. Lucas ; I. Turner ; N. Dominy ; N. Yamashita | 2000The two major mechanical defences of plants are toughness and hardness. These have different material causes and ecological functions. In any non-metal, high toughness is achieved by composite construction (i.e. by an organized mixture of compon[...]
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J. Rosenheim ; L. Wilhoit ; P. Goodell ; E. Grafton-Cardwell ; T. Leigh | 1997
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J. Kahl ; D. Siemens ; R. Aerts ; R. Gabler ; F. Kuhnemann ; C. Preston ; I. Baldwin | 2000Herbivory induces both direct and indirect defenses in plants: however, some combinations of these defenses may not be compatible. The jasmonate signal cascade activated both direct (nicotine accumulations) and indirect (mono and sesquiterpene e[...]
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The interaction between physiological stress and arthropod herbivory was studied using two perennial species of Hypericum, Seedlings of H. perforatum, a herb introduced to Australia and weedy in places, and H. gramineum, an indigenous species, w[...]
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A. Agrawal | 2000Trade-offs in fitness on different host plants has been a central hypothesis in explaining the evolutionary specialization of herbivores. Surprisingly, only a few studies have documented such trade-offs. In this paper, I present results from a s[...]
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1. The negative effect of induced plant resistance on the preference and performance of herbivores is a well-documented ecological phenomenon that is thought to be important for both plants and herbivores. This study links the well-developed mec[...]
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M. Kearsley ; T. Whitham | 1998We define the ''developmental stream'' of a plant as the gradient of increasingly mature phenotypes its shoots express over its lifetime. This pattern has important implications for studies of morphology, physiology, reproduction, and interactio[...]
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The growth rate hypothesis, which states that fast-growing plants support more herbivores than slow-growing plants, was tested with 12 native and 1 naturalized British grasses using the grain aphid (Sitobion avenae). Five aphids were enclosed wi[...]
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Insect herbivores that have high impacts on their host plants reduce the longevity of their habitats and require dispersal mechanisms. This hypothesis was tested by comparing the life history traits, particularly short- and long-distance dispers[...]
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A. Shapiro ; J. De Vay | 1987
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K. Larson ; T. Whitham | 1991
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A. Waltz ; T. Whitham | 1997We examined the hypothesis that developmental phase changes from juvenile to mature growth in plants affect the distribution of common herbivores, which in turn affect the rest of the arthropod community. Using naturally occurring clones of cott[...]
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P. Grubb | 1992
