Bionomics of Autogenous Mosquitoes Andrew Spielman - PowerPoint PPT Presentation

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Bionomics of Autogenous Mosquitoes Andrew Spielman

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  1. Bionomics of Autogenous MosquitoesAndrew Spielman Presented by Anthony Clemons 1st Year Grad Student

  2. 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

  3. 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

  4. Focus of Article • To bring together some of the literature that has characterized facultative blood-feeding

  5. Autogeny vs Anautogeny • Anautogenous mosquito require 1 or in some cases 2 (super-anautogeny) BM before they are able to lay eggs • Diapause • Large clutch size • 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)

  6. Contributing Factors • Genetics • Nutrition (Possible link to genetics) • Environment

  7. 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

  8. Nutrition

  9. 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,

  10. 3) Placement of eggs developed after beta-ecdysone into hemolymph of female A. aegypti, • And, 4) Abdomen ligation

  11. Environmental Factors • Temporal, spatial and behavioral barriers due to location play a role in the distribution of antogenous vs anautogenous mosquitoes