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The impact of selective oviposition, egg hatchability, food availability and infection with Plagiorchis elegans on the pre-imago population dynamics of Aedes aegypti (Diptera:Culicidae) /Schwab, Anne Elisabeth. January 2000 (has links)
Cercariae of the digenean Plagiorchis elegans cause high levels of morbidity and mortality among larvae of Aedes aegypti . The impact of this parasite on the larval population dynamics of the experimental host as mediated through intraspecific competition, egg hatchability and ovipositional preference was assessed by calculating the probability of pre-imagos to develop from one stage to the next, or to die within consecutive 24 h intervals. Attractiveness of the water to ovipositing females in a dynamic larval population was not affected by exposure to the parasite, but varied significantly over time, regardless of food abundance. In optimally fed populations, these changes were positively correlated with pupal production, but were not affected by early instar development. Most of the entomopathogenic effects of the parasite were expressed in the pupal stage. Thus, exposure to the parasite significantly reduced adult emergence, but did not greatly impair pre-imago development. Nonetheless, exposure to various levels of the parasite significantly increased mortality of all larval stages. Suboptimally fed larval populations displayed severely impaired development and produced few adults. Exposure to P. elegans increased adult production slightly, suggesting depensatory mortality. In nutritionally stressed populations, no correlation was found between biomass and ovipositional preference, but attractiveness of the water was significantly increased by the removal of individuals by pupation or mortality. Egg hatchability was not significantly affected by population structure, but varied with the nutrient content of the water. This study provides new insight into the use of parasites as agents in the biological control of mosquitoes.
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The influence of experimental Plagiorchis nobeli (Trematoda: Plagiorchiidae) infections on the survival and development of Aedes aegypti /Dempster, Shiona Jane January 1988 (has links)
No description available.
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The effects of Plagiorchis noblei, Park, 1936 on the reproductive success and behaviour of adult Aedes aegypti /Kimoro, Charles Omuoyo January 1990 (has links)
Aedes aegypti pupae were exposed to cercariae of the digenean Plagiorchis noblei in order to assess the effects of infection on the spontaneous flying activity and reproductive success of surviving adults. Infections established primarily in the thorax and abdomen of the insects (mixed infections) or in the abdomen alone. In mixed infections, as few as one or two metacercariae in the thorax reduced the spontaneous flying time of females by almost half. Such infections also reduced total egg production, the number of ovarian cycles, fecundity per cycle, as well as fertility and life span of female hosts. The fertility and life span of males was similarly affected. Purely abdominal infections reduced the life span of males and females as well as the fertility of males, but only at high intensities. Such effects on adult behaviour, reproductive success and life span may augment the known lethal effects of the parasite.
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Aedes aegypti (Diptera:Culicidae) oviposition attractionrepellencyZahiri, Nayerolsadat. January 1997 (has links)
Waters from normal larvae of Aedes aegypti (L.) are highly attractive to ovipositing conspecific females, whereas waters from larvae infected with the entomopathogenic digenean parasite, Plagiorechis elegans Rudolphi, are rendered strongly repellent. The production of the repellent appears to be mediated by the degree of environmentally induced stress experienced by the larvae. Whereas waters from fully fed larvae were highly attractive as an oviposition site, these were rendered progressively less attractive, and eventually strongly repellent as the larvae were deprived of food over a period of 7 days. Crowding of the larvae elicited similar repellent effects as did close contact between larvae and the walls of the container in which they were reared. The site of infection in the tissues of the mosquito larvae also influenced the intensity of repellency. Thus, infections of the head and thorax induced the highest degree of repellency, and infections of the abdomen the lowest. The repellent effect overrode attraction and remained stable for more than one week at 27°C, and even longer at lower temperatures. Stressors which induced repellency all precipitated similar physical and physiological changes in mosquito larvae. They reduced wet and dry weights and the concentration of serum carbohydrates, amino acids, proteins and lipids. Both infection and crowding rendered larvae anorexic. As well, infected larvae appeared to be unable to convert trehalose to glucose, thereby exacerbating the energy deficit. Incubating infected larvae in a dilute glucose solution significantly reduced the repellent effect of their waters. Addition of glucose to already repellent waters had little effect. Larvae of another species, Aedes atropalpus Coquillett, were equally capable of producing repellent effects when infected with P. elegans, and gravid females of Ae. aegypti were equally sensitive to these as to conspecific waters. This sensitivity, however, was not reciprocal. Aedes
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The impact of selective oviposition, egg hatchability, food availability and infection with Plagiorchis elegans on the pre-imago population dynamics of Aedes aegypti (Diptera:Culicidae) /Schwab, Anne Elisabeth. January 2000 (has links)
No description available.
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Aedes aegypti (Diptera:Culicidae) oviposition attractionrepellencyZahiri, Nayerolsadat. January 1997 (has links)
No description available.
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Behavioural responses of fourth instar Aedes aegypti (Diptera:Culcidae) larvae to Plagiorchis elegans cercariaeKioulos, Ilias P. January 2003 (has links)
No description available.
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The effects of Plagiorchis noblei, Park, 1936 on the reproductive success and behaviour of adult Aedes aegypti /Kimoro, Charles Omuoyo January 1990 (has links)
No description available.
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The influence of experimental Plagiorchis nobeli (Trematoda: Plagiorchiidae) infections on the survival and development of Aedes aegypti /Dempster, Shiona Jane January 1988 (has links)
No description available.
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Genetic variation of traits affecting disease transmission in the mosquito Aedes aegyptiAriani, Cristina Valente January 2015 (has links)
No description available.
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