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AbstractHeterorhabditis is frequently found in coastal sandy soils where it mayexperience both high salinity and high temperatures. We tested the abilityof infective juveniles (IJs) of three taxonomic groups of Heterorhabditis toinfect insects in saline sand. We also tested whether salinity (sea water)affected the IJs' ability to tolerate elevated temperatures in aqueoussuspension and in sand. IJs of all three taxonomic groups killed Galleriamellonella in saline sand (25.6% insects killed), but at a lower level thanin non-saline sand (96.5% insects killed). Exposure of IJs in sand to hightemperature reduced their ability to kill G. mellonella at 20 degrees C;heating IJs in saline sand reduced G. mellonella mortality to a lesserextent (25.6% at 20 degrees C, 18.3% at 39 degrees C) than heating innon-saline sand (96.5% at 20 degrees C, 17.5% at 39 degrees C). In aqueoussuspension, IJs of the North-West European and Irish types ofHeterorhabditis tolerated high temperature better in sea water (at least 95%survived 1 h at 39 C) than in distilled water (none survived 1 h at 38degrees C). H. bacteriophora was more temperature tolerant: survival andsubsequent infectivity of IJs was unaffected by temperature up to 39 degreesC in either medium. It was concluded that high salinity (sea water) reducesthe ability of Heterorhabditis IJs to infect, but improves their toleranceof high temperature. Effets des chocs dus a la salinite et a la temperaturesur la survie et l'infestivite des juveniles infestants d' Heterorhabditisspp. - Les Heterorhabditis sont frequemment rencontres dans les sols sableuxcotiers ou ils peuvent etre soumis a des salinites et des temperatureselevees. Nous avons teste la capacite des juveniles infestants (IJs) detrois groupes taxinomiques d'Heterorhabditis a infester des insectes dans dusable sale. Nous avons aussi cherche a savoir si la salinite (eau de mer)affecte la capacite des IJs a tolerer des temperatures elevees, soit ensuspension aqueuse, soit dans du sable. Les IJs des trois troupestaxinomiques tuent les Galleria mellonella dans le sable sale, mais a untaux plus faible que dans le sable non sale (25,6 contre 96,5% des insectestues). L'exposition des IJs dans du sable a des temperatures elevees reduitleur capacite a tuer G. mellonella a 20 degrees C; le chauffage des IJs dansdu sable sale reduit la mortalite des G. mellonella dans un moindre mesure(25,6 a 20 degrees C contre 18,3% a 39 degrees C) que dans du sable non sale(96,5% a 20 degrees C contre 17,5% a 39 degrees C). En suspension aqueuse,les IJs des types Europe du nord-ouest et d'Irlande tolerent mieux lestemperatures elevees dans l'eau de mer (au moins 95% survivent 1 h a 39degrees C) que dans l'eau distillee (aucune survie apres 1 h a 38 degreesC). H. bacteriophora montre la meilleure tolerance a la temperature: lasurvie et l'infestivite ulterieures des IJs ne sont pas affectees par latemperature jusqu'a 39 degrees C dans l'un et l'autre milieux. Il en estconclu que les salinites elevees (eau de mer) reduisent la capacited'infestation des IJs d'Heterorhabditis, mais ameliorent leur tolerance auxtemperatures elevees.
Nematology – Brill
Published: Jan 1, 1999
Keywords: ENTOMOPATHOGENIC NEMATODE; TEMPERATURE; ENVIRONMENTAL STRESS; SALT TOLERANCE; HETERORHABDITIS; SALINITY; HEAT TOLERANCE
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