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Infectivity of Two Isolates of Helicosporidium spp. (Chlorophyta: Trebouxiophyceae) in Heterologous Host Insects

Tracy Conklin, Verena-Ulrike Bläske-Lietze, James J. Becnel and Drion G. Boucias
The Florida Entomologist
Vol. 88, No. 4 (Dec., 2005), pp. 431-440
Stable URL: http://www.jstor.org/stable/3496636
Page Count: 10
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Infectivity of Two Isolates of Helicosporidium spp. (Chlorophyta: Trebouxiophyceae) in Heterologous Host Insects
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Abstract

Members of the genus Helicosporidium are the first described algal insect pathogens. They have a close affinity to the non-photosynthetic algae of the genus Prototheca, and have a wide host range, infecting many species of aquatic and terrestrial insects. In this study the infectivity of two Helicosporidium spp. isolates, originating from a black fly (SjHe) and an aquatic weevil (CsHe), was tested against a weevil Diaprepes abbreviatus (L.) and three mosquito species Anopheles quadrimaculatus Say, Culex quinquefasciatus Say, and Aedes aegypti (L.). The weevil constitutes a new experimental host record for helicosporidia. The CsHe isolate was more virulent than the SjHe isolate in D. abbreviatus. Anopheles quadrimaculatus was the most susceptible mosquito species measured by infection rate and mortality. The infectivity and virulence of SjHe and CsHe isolates did not differ in any of the mosquito species. /// Los miembros del género Helicosporidium son los primeros patógenos algáceos descritos para insectos. Estos patógenos tienen una afinidad cercana a las algas no fotosintéticas del género Prototheca, y tienen un rango amplio de hospederos, infectando muchas especies de insectos acuáticos y terrestres. En este estudio la capacidad de infección de dos aislamientos de Helicosporidium spp., obtenidos de una mosca negra (SjHe) y un gorgojo acuático (CsHe), fue probada contra el gorgojo Diaprepes abbreviatus (L.) y tres especies de mosquitos Anopheles quadrimaculatus Say, Culex quinquefasciatus Say, y Aedes aegypti (L.). El gorgojo es considerado un nuevo registro de un hospedero experimental para helicosporidia. El aislamiento de CsHe fue mas virulento que el aislamiento de SjHe en D. abbreviatus. Anopheles quadrimaculatus fue la especie de mosquito mas susceptible medida por la tasa de infección y de mortalidad. La infectividad y virulencia de los aislamientos de SjHe y CsHe no fue diferente dentro de las especies de mosquitos.

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