Vista normal Vista MARC

Patterns of covert infection by invertebrate pathogens: iridescent viruses of blackflies

Por: Williams, Trevor. Doctor [autor/a].
Tipo de material: Artículo impreso(a) Artículo impreso(a) Tema(s): Simulium variegatum | Densidad de población | Iridovirus | Virus de invertebrados | Control biológico de plagasTema(s) en inglés: Simulium variegatum | Population density | Iridoviruses | Invertebrate viruses | Pest control biologicalClasificación: AR/632.96 / W5 / 1 Nota de acceso: Disponible para usuarios de ECOSUR con su clave de acceso En: Molecular Ecology. volumen 4, número 4 (1995), páginas 447-457. --ISSN: 1365-294XNúmero de sistema: 19587Resumen:
Inglés

Recently, it has been recognized that blackfly populations mar host two forms of infection by iridescent viruses (IVs)¡ a covert (inapparent, nonlethal) form which was common in springtime populations in the River Ystwyth, Wales, and a patent (obvious, lethal) form which was rafe. This study aimed to investigate the changes in frequency of the two types of infection in blackfly populations ayer the reproductive period of the flies, April-September 1992. Blackfly larvae sampled from three different sites along the river were bioassayed for the presence of covert IV infection. Of 870 larvae assayed, 17 were found to be infected. AII the infected larvae appeared to be Simulium variegatum, the dominant species during the sampling periodo IV infections were common in the spring (17-37% depending on site) but appeared absent in the S. variegatum population for most of the summer months, reappearing again in the autumn (0-20% infected).

These fluctuations were concurrent with biotic and abiotic factors: elevated levels of covert infection occurred at low population densities, high water flow rates, low temperatures (and presumably slower growth rates), although it is not clear if any cause-and-effect relationship exists. Patent infections occurred immediately alter the peak of covert infection in the spring, and again in the autumn. Virus characterization of isolates from covertly infected larvae showed that three distinct groups of isolates were present in the blackfly population. Isolates from the springtime populations were mostIy variants of an isolate found in patentIy infected blackfly larvae in the 1970s (Aberystwyth IV). Isolates from the autumn populations were mostIy variants of an isolate from a patentIy infected larva found in September the previous real. A third group comprised a single novel isolate which wás detected in a covertly infected larva. The mechanisms by which IVs persist in blackfly populations remain unknown, although the role of altemative hosts is a possibility which needs to be studied.
Lista(s) en las que aparece este ítem: Williams Trevor
Etiquetas de esta biblioteca: No hay etiquetas de esta biblioteca para este título. Ingresar para agregar etiquetas.
Star ratings
    Valoración media: 0.0 (0 votos)
Existencias
Tipo de ítem Biblioteca actual Colección Signatura Info Vol Estado Fecha de vencimiento Código de barras
Artículos Biblioteca Electrónica
Recursos en línea (RE) 		ECOSUR Recurso digital ECO400195874635
Artículos Biblioteca San Cristóbal

Texto en la configuración de la biblioteca San Cristóbal

Artículos (AR) 		ECOSUR AR 632.96 W5 001 Disponible SER000939
Artículos Biblioteca San Cristóbal

Texto en la configuración de la biblioteca San Cristóbal

Artículos (AR) 		ECOSUR AR 632.96 W5/EJ. 2 003 Disponible ECO010018213
Artículos Biblioteca Tapachula

Texto colocado en la configuración de la biblioteca Tapachula

Artículos (AR) 		ECOSUR AR 632.96 W5 002 Disponible ECO020010382

Disponible para usuarios de ECOSUR con su clave de acceso

Recently, it has been recognized that blackfly populations mar host two forms of infection by iridescent viruses (IVs)¡ a covert (inapparent, nonlethal) form which was common in springtime populations in the River Ystwyth, Wales, and a patent (obvious, lethal) form which was rafe. This study aimed to investigate the changes in frequency of the two types of infection in blackfly populations ayer the reproductive period of the flies, April-September 1992. Blackfly larvae sampled from three different sites along the river were bioassayed for the presence of covert IV infection. Of 870 larvae assayed, 17 were found to be infected. AII the infected larvae appeared to be Simulium variegatum, the dominant species during the sampling periodo IV infections were common in the spring (17-37% depending on site) but appeared absent in the S. variegatum population for most of the summer months, reappearing again in the autumn (0-20% infected). eng

These fluctuations were concurrent with biotic and abiotic factors: elevated levels of covert infection occurred at low population densities, high water flow rates, low temperatures (and presumably slower growth rates), although it is not clear if any cause-and-effect relationship exists. Patent infections occurred immediately alter the peak of covert infection in the spring, and again in the autumn. Virus characterization of isolates from covertly infected larvae showed that three distinct groups of isolates were present in the blackfly population. Isolates from the springtime populations were mostIy variants of an isolate found in patentIy infected blackfly larvae in the 1970s (Aberystwyth IV). Isolates from the autumn populations were mostIy variants of an isolate from a patentIy infected larva found in September the previous real. A third group comprised a single novel isolate which wás detected in a covertly infected larva. The mechanisms by which IVs persist in blackfly populations remain unknown, although the role of altemative hosts is a possibility which needs to be studied. eng

Disponible en línea

Adobe Acrobat profesional 6.0 o superior

Con tecnología Koha