Plant-mediated species networks: the modulating role of herbivore density
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Scholar |
Otros documentos de la autoría: Pineda, Ana; Soler, Roxina; Pastor, Victoria; Li, Yehua; Dicke, Marcel
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Mostrar el registro completo del ítemcomunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/2508
comunitat-uji-handle3:10234/6999
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http://dx.doi.org/10.1111/een.12404 |
Metadatos
Título
Plant-mediated species networks: the modulating role of herbivore densityFecha de publicación
2017-08Editor
WileyCita bibliográfica
PINEDA, Ana; SOLER, Roxina; PASTOR FUENTES, María Victoria; LI, Yehua; DICKE, Marcel. Plant-mediated species networks: the modulating role of herbivore density. Ecological entomology (2017), v. 42, issue 4, p. 449-457Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
http://onlinelibrary.wiley.com/doi/10.1111/een.12404/fullVersión
info:eu-repo/semantics/publishedVersionPalabras clave / Materias
Resumen
1. When herbivores of distinct feeding guilds, such as phloem feeders and leaf chewers, interact, the outcome of these interactions often shows facilitation. However, whether this facilitation turns into competition ... [+]
1. When herbivores of distinct feeding guilds, such as phloem feeders and leaf chewers, interact, the outcome of these interactions often shows facilitation. However, whether this facilitation turns into competition at stronger herbivory pressure remains unknown.
2. Using an integrative approach that links ecological processes (behavioural choices of insects) with physiological plant mechanisms (nutrient and phytohormone levels) for the wild crucifer Brassica nigra (L.) Koch., this study evaluates preferences of leaf chewers for plants previously infested with several densities of the specialist aphid Brevicoryne brassicae L. (Hemiptera, Aphididae). As leaf chewers, four species of caterpillars (Lepidoptera) were selected that differ in their degree of specialisation in crucifers.
3. These results show that, whereas at low and medium aphid densities caterpillars displayed a preference for aphid-infested plants or no preference, at high aphid infestation density, all four species of caterpillar preferred uninfested plants, with a significant difference for Pieris rapae and Mamestra brassicae.
4. In contrast to our expectation, the consistent preference for uninfested plants at a high aphid density could not be associated with a decrease in plant nutrition. However, while jasmonate concentrations [i.e. 12-oxo-phytodienoic acid and jasmonic acid (JA)] at medium aphid-density infestation decreased compared with low levels of infestation, at high infestation level, the jasmonates JA as well as JA conjugated with the amino acid isoleucine were present at higher levels compared with low-infestation treatments.
5. This work provides evidence that positive interactions observed in herbivore communities can be transient, leading to negative interactions mediated by changes in plant defences rather than in plant nutrition. [-]
Publicado en
Ecological entomology (2017), v. 42, issue 4Proyecto de investigación
1) Netherlands Organization for Scientific Research (NWO) (ALW grant no. 822.01.005 to MD, and VENI grant no. 863.08.028 to RS); 2) Post-doctoral EU Marie Curie Individual Fellowship (no. 234895)Derechos de acceso
http://rightsstatements.org/vocab/CNE/1.0/
info:eu-repo/semantics/restrictedAccess
info:eu-repo/semantics/restrictedAccess
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