Effect of egg production dynamics on the functional response of two parasitoids

• Autores: Aguirre, María Belén; Logarzo, Guillermo Alejandro; Triapitsyn, Serguei V.; Diaz Soltero, Hilda; Hight, Stephen D.; Bruzzone, Octavio Augusto
• Año de publicación: 2024
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Population Dynamics; Biological Control; Longitudinal Studies; Behaviour
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

Functional response describes the number of hosts attacked by a parasitoid in relation to host densities and plays an important role by connecting behavioral-level processes with community-level processes. Most functional response studies were carried out using simple experimental designs where the insects were confined to a plain and small arena with different host densities during a fixed period of time. With these designs, other factors that might affect the functional response of parasitoids were not analyzed, such as fecundity, age, and experience. We proposed a series of latent-variables Markovian models that comprised an integrated approach of functional response and egg production models to estimate the realized lifetime reproductive success of parasitoids. As a case study, we used the parasitoids Anagyrus cachamai and A. lapachosus (Hymenoptera: Encyrtidae), two candidate agents for neoclassical biocontrol of the Puerto Rican cactus pest mealybug, Hypogeococcus sp. (Hemiptera: Pseudococcidae). The tested species were assessed according to their physiology and prior experience. We estimated the number of mature eggs after emergence, egg production on the first day, egg production rate, the proportion of eggs resorbed, egg resorption threshold, and egg storage capacity. Anagyrus cachamai and A. lapachosus both presented a type III functional response. However, the two parasitoids behaved differently; for A. cachamai, the number of parasitized hosts decreased with female age and depended on the number of mature eggs that were available for oviposition, whereas A. lapachosus host parasitism increased with female age and was modulated by its daily egg load and previous experience. The methodology presented may have large applicability in pest control, invasive species management, and conservation biology, as it has the potential to increase our understanding of the reproductive biology of a wide variety of species, ultimately leading to improved management strategies.
Fil: Aguirre, María Belén. Fundación para el Estudio de Especies Invasivas; Argentina. Centro de Estudios Históricos "Profesor Carlos S. A. Segreti". Instituto de Estudios Históricos - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Estudios Históricos; Argentina
Fil: Logarzo, Guillermo Alejandro. Fundación para el Estudio de Especies Invasivas; Argentina
Fil: Triapitsyn, Serguei V.. United States Department of Agriculture; Estados Unidos
Fil: Diaz Soltero, Hilda. No especifíca;
Fil: Hight, Stephen D.. United States Department of Agriculture; Estados Unidos
Fil: Bruzzone, Octavio Augusto. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Patagonia Norte. Estación Experimental Agropecuaria San Carlos de Bariloche. Instituto de Investigaciones Forestales y Agropecuarias Bariloche. - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones Forestales y Agropecuarias Bariloche; Argentina