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• W20474310 abstract "The reproductive success and survivorship of adult male damselflies Enallagma hageni infected with ectoparasitic larval water mite Arrenurus spp. was examined. Parasitic prevalencelincidence of non-mating vs. mating males was analyzed to determine reproductive success. Body mass of parasite vs. non-parasite infected males was analyzed to determine survivorship. It was discovered that parasites are more prevalent and incident on non-mating vs. mating males. The presence of parasites on male damselflies can significantly depress their mating success. The average body weight of male damselflies with parasites was significantly lower than that of males without parasites only if infected males had high levels of parasites. Thus, parasitic water mites significantly change the survivorship of male damselflies only at high parasite levels. Reproductive success of E. hageni is more sensitive to water mite Arrenurus than survivorship. General Biology and Collection of Study Species Aquatic ectoparasitic larval mites are generalist parasites (Forbes et al. 1999) and have been shown to alter the mating success and survivorship of several species of adult damselflies (Forbes and Baker 199 1 ; Forbes 1991 a; Andrks and Cordero 1998; Polak 2003). They have been known to affect survivorship by taking vital nutrition from the damselfly, draining precious body fluid (Andr6s and Cordero 1998), or by acting as a vector for transmittable diseases (Polak 2003). Some get onto the damselfly by first attaching to the damselfly larval stage without parasitizing it (Smith 1988; Robb and Forbes 2005a). When the adult damselfly emerges, the ectoparasites reattach and begin to engorge, piercing the host cuticle with a feeding tube (chelicerae) within 24 hours of reattachment (Smith 1988; Forbes 1991b; Robb and Forbes 2005a). Timing is the major factor that influences location of attachment on the host. They usually attach to the first segment they contact (Smith 1988). They then secrete a dense substance to cement them to the host. While attached to the host, the parasite can increase 80 to 90 fold in volume (Smith 1988). Enallagma hageni is a medium-sized, sexually dimorphic damselfly that is widely distributed across eastern North America (Fincke 1982). It is non-territorial and the flight season occurs from mid-June to early August (Fincke 1982, 1984). Unlike many species of damselflies, females of Enallagma hageni cannot be forced to mate. When the male seizes the female, she must raise her abdomen to copulate. If she refuses to do this, she is released within 1-1 0 minutes (Fincke 1984). Because of the large sex bias and because all females are thought to mate, male mating success is much more variable than female mating success (Fincke 1982). Mites were chosen because they are readily visible and easy to count on the ventral side of the abdomen and thorax of adult odonates. Adult Enallagma hageni are easy to capture with nets whether or not they are in copulation pairs. Because females cannot be forced to mate, direct" @default.
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• W20474310 date "2006-01-01" @default.
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• W20474310 title "Reproductive success and survivorship of damselfly Enallagma hageni infected with ectoparasite Arrenurus." @default.
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