bionomics of autogenous mosquitoes andrew spielman presented by anthony clemons 1 st year grad...
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Bionomics of Autogenous Mosquitoes
Andrew Spielman
Presented by Anthony Clemons1st Year Grad Student
Keywords Defined
• Bionomics – comprehensive study of an organism and its relationship to its environment
• Autogeny – egg production through facultative blood-feeding– Facultative - BF when conditions permit
• Anautogeny - egg production through obligate blood feeding– Obligate – BF is necessary for egg production
• Fecundity – the ability to reproduce• Diapause – delay in development in response
to regulatory or adverse environmental conditions
• Corpora allata – endocrine gland which generates juvenile hormone– Juvenile hormone – promotes larval development
and inhibits metamorphosis
• Corpora cardiaca – function in the storage and secretion of brain hormones i.e. neurosecretory hormone
Focus of Article
• To bring together some of the literature that has characterized facultative blood-feeding
Autogeny vs Anautogeny• Autogenous mosquito
can lay one clutch of eggs before the requirement of a blood-meal (BM) for subsequent egg lays
• Absence of diapause, the arrest of ovary development
• Small clutch size (non-BM egg lay)
• Anautogenous mosquito require 1 or in some cases 2 (super-anautogeny) BM before they are able to lay eggs
• Diapause• Large clutch size
Contributing Factors
• Genetics• Nutrition (Possible link to genetics)• Environment
Genetics
• Chromosome III carries information that regulates autogeny
• Chromosome I carries genetic information that modifies the penetrance of genetic information from Chromosome III
• Quantitative trait loci determine autogeny and body size in Asian tiger mosquito (Aedes albopictus) A. Mori et. al. Heredity 2008
Nutrition
• Autogenous mosquitoes amass much greater stores of fat during larval life
• To induce yoke deposition in ovaries of anautogenous females researchers 1) transplatated corpora allata,
• 2) Transfused hemolymph,
• 3) Placement of eggs developed after beta-ecdysone into hemolymph of female A. aegypti,
• And, 4) Abdomen ligation
Environmental Factors
• Temporal, spatial and behavioral barriers due to location play a role in the distribution of antogenous vs anautogenous mosquitoes
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