RT info:eu-repo/semantics/article
T1 Quantitative parameters and ecological implications of a specialized tritrophic interaction involving a seed-feeding tortricid, Pseudargyrotoza conwagana, a braconid parasitoid, Bracon otiosus, and the wild privet, Ligustrum vulgare
A1 Hernández Lázaro, Ángel
A1 Falcó Gari, José Vicente
K1 Plantas - Enfermedades y plagas - España
K1 Bosques y silvicultura - España
K1 Plantas silvestres
K1 Insectos perjudiciales y útiles
K1 Ecología
K1 3108 Fitopatología
K1 3103.09 Cultivos de Plantas
K1 3106 Ciencia Forestal
AB Little is known about tritrophic interactions involving seed-feeding insects, parasitoid wasps, and wild fleshy fruits. Here, we examine relationships between Pseudargyrotoza conwagana (F.) (Lepidoptera: Tortricidae), Bracon otiosus Marshall (Hymenoptera: Braconidae), and the wild privet, Ligustrum vulgare L. (Lamiales: Oleaceae), after collecting fruits in a hedgerow habitat in northwest Spain and rearing insects indoors. No other insect species was detected in this trophic system. Each fruit contained one to four seeds, each infested fruit contained only one seed-feeding tortricid caterpillar, and each parasitized caterpillar was affected by a single braconid individual, i.e., B. otiosus was a solitary parasitoid. Almost half of the wild privet shrubs were infested by P. conwagana, and infestation ranged from 2 to 32% of fruits per infested shrub. The general effect of P.conwagana on wild privet dispersal can be considered low, as the overall rate of seed infestation was low (6% of seeds). The infestation rate was higher in wild privet shrubs with a larger number of seeds per fruit, and tortricid caterpillars that left the fruits successfully ate >80% of seeds. In total, the parasitism rate was moderate (25% of caterpillars), but varied considerably (0‒75%) among shrubs where P. conwagana infestation was detected. Parasitism only occurred in shrubs showing high infestation rates (19‒32% infested fruits), i.e., with high host densities; however, the parasitism rate was density-independent in these shrubs. The wild privets benefited from the action of B. otiosus in two ways: the tortricid caterpillar population was partly eliminated, and the caterpillars were prevented from eating more than one seed per fruit. The B. otiosus sex ratio was very balanced (1 male to 1.18 females). Winter diapause and protandry were prevalent in B. otiosus.
PB Entomological Society of America
SN 1536-2442
YR 2014
FD 2014
LK https://uvadoc.uva.es/handle/10324/50699
UL https://uvadoc.uva.es/handle/10324/50699
LA eng
NO Journal of Insect Science, 2014, Vol 14, Nº. 128, 19 pp.
NO Producción Científica
DS UVaDOC
RD 23-nov-2024