The effect of tree genetic diversity on insect herbivory varies with insect abundance

Autor: Arndt Hampe, Hervé Jactel, Pilar Fernandez-Conradi, María José Leiva, Bastien Castagneyrol
Přispěvatelé: Biodiversité, Gènes et Communautés, Institut National de la Recherche Agronomique (INRA), Departamento de Biología Vegetal y Ecología, Universidad de Almería (UAL), Biodiversité, Gènes & Communautés (BioGeCo), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB), Universidad de Sevilla
Jazyk: angličtina
Rok vydání: 2017
Předmět:
0106 biological sciences
comestibilité
variance in edibility
media_common.quotation_subject
Biodiversité et Ecologie
Foraging
edibility
herbivore
Insect
010603 evolutionary biology
01 natural sciences
mixed-diet
Quercus robur
Biodiversity and Ecology
Abundance (ecology)
oak
Lymantria dispar
pedunculate oak
Ecology
Evolution
Behavior and Systematics
media_common
2. Zero hunger
Herbivore
Genetic diversity
Ecology
biology
Resistance (ecology)
Environmental and Society
fungi
insecticide
15. Life on land
biology.organism_classification
[SDE.ES]Environmental Sciences/Environmental and Society
genêtic variation
génotype végétal
regeneration
diversité génétique
[SDE]Environmental Sciences
Environnement et Société
[SDE.BE]Environmental Sciences/Biodiversity and Ecology
associational resistance
010606 plant biology & botany
quercus robur
Zdroj: Ecosphere
Ecosphere, Ecological Society of America, 2017, 8 (1), pp.1-13. ⟨10.1002/ecs2.1637⟩
Ecosphere, Ecological Society of America, 2017, 8 (1), ⟨10.1002/ecs2.1637⟩
Ecosphere 1 (8), 1-13. (2017)
ISSN: 2150-8925
DOI: 10.1002/ecs2.1637⟩
Popis: International audience; Variance in edibility among plant genotypes is expected to be a key driver of plant genetic diversity (PGD) effects on abundance of insect herbivores and resulting herbivory. Yet, herbivore foraging behavior and leaf consumption may be also context-dependent and, in particular, influenced by herbivore density, which remains unexplored. We used a combination of field and laboratory experiments with saplings from four half-sib families (henceforth, families) of pedunculate oak (Quercus robur) to test how PGD and herbivore density interactively affect herbivory. Insect herbivory was assessed in a common garden experiment with plots containing all possible combinations of individuals from one to four oak families. Herbivore density was manipulated by spraying insecticide in a factorial design. Complementary feeding trials with gypsy moth larvae (Lymantria dispar) were used to further explore the mechanisms underlying observed patterns in the field. Herbivory decreased with increasing PGD under normal herbivore density, but not under reduced herbivore abundance. The most damaged oak family in the field was also the most consumed in non-choice tests and was consistently preferred over other families in choice tests. Trials showed that the presence of less edible families in the diet reduced overall consumption by gypsy moth larvae. Under field conditions, the most edible family consistently benefited most from being associated with less edible, neighboring genotypes. Our results demonstrate that small-scale PGD can provide associational resistance to insect herbivory, probably through change in herbivore foraging activity. Importantly, they also reveal that the magnitude of genetic diversity effect depends on herbivore density.
Databáze: OpenAIRE
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