Nasonia vitripennis

(Walker, 1836)

Blowfly Chalcid Wasp

is a small and the best-studied member of the Nasonia. It parasitizes pupae of carrion flies, particularly blowflies (Calliphora spp.) and flesh flies. The exhibits haplodiploid sex determination, with females developing from fertilized and haploid males from unfertilized eggs. It has become a major model organism for studies of genetics, development, , and -mediated . The was fully sequenced in 2010, facilitating research on venom proteins, , and epigenetic mechanisms including methylation.

Nasonia vitripennis by (c) Поляков Александр, some rights reserved (CC BY), uploaded by Поляков Александр. Used under a CC-BY license.

Pronunciation

How to pronounce Nasonia vitripennis: //nəˈsoʊniə ˌvɪtrɪˈpɛnɪs//

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Identification

Females distinguished from other Nasonia by straight stigmal (other three species show varying curvature). Males identified by spindle-shaped antennal scape (vs. angulate in N. giraulti and N. oneida, cylindrical in N. longicornis) and shorter, wider antennal . Males also have smaller forewings than other Nasonia species. Species-level identification requires examination of both sexes and comparison with .

Images

Habitat

Associated with carrion and bird nests where blowfly and flesh fly develop; laboratory maintained on blowfly pupae

Distribution

Europe (documented latitudinal from Corsica at 42°N to northern Finland at 65°N); also recorded from Brazil (Goiás, Minas Gerais, Rio de Janeiro, Rio Grande do Sul, São Paulo), Argentina, Australia, and Canada (Alberta)

Seasonality

Activity patterns show circadian rhythmicity with latitudinal variation; photoperiodic induction varies with latitude

Host Associations

Calliphora spp. - primary for laboratory rearing; females drill into and deposit under puparium
blowflies - natural in field
flesh flies - natural in field

Life Cycle

Females drill into and deposit underneath. Development includes embryonic, larval, and pupal stages within host. Larval is maternally induced based on photoperiodic cues; critical and switch point vary latitudinally. Haplodiploid sex determination: unfertilized eggs produce haploid males, fertilized eggs produce females. Non-complementary sex determination system (MEGISD model) involving maternal effect genomic imprinting.

Behavior

Males produce from rectal papillae released through ; strongly attract virgin females but not mated females. Cephalic pheromones released from mouth during courtship. Females contact male mouth with to signal receptivity. After mating, females switch from mate-seeking to -seeking , thought to be triggered by pheromone exposure rather than sperm transfer. Demonstrates associative learning: females form olfactory memories (e.g., cinnamon association) lasting at least 24 hours after single training event. Early memory involves four distinct phases based on CO2 sensitivity. Males show higher circadian rhythmicity than females in constant darkness; mating decreases rhythmicity in both sexes.

Ecological Role

agent of carrion fly ; of blowfly and flesh fly pupae that would otherwise develop in bird nests and carrion

Human Relevance

Model organism for genetic and developmental research; sequenced in 2010. Used in studies of , sex determination, venom evolution, methylation, , learning and memory, and - interactions. Potential for development as and system for filth flies. Used as safety assessment model for pest-specific dsRNA in biological control applications.

Similar Taxa

Nasonia giraultiMale has angulate (not spindle-shaped) antennal scape; female has curved stigmal
Nasonia oneidaMale has angulate antennal scape; female has curved stigmal
Nasonia longicornisMale has cylindrical (not spindle-shaped) antennal scape; female has curved stigmal

More Details

Wolbachia endosymbionts

bacteria (multiple strains from supergroups A and B). Wolbachia causes : sperm from infected males fertilizing uninfected results in paternal fragmentation and conversion of female eggs to haploid males. Bacterial correlates with compatibility differences; higher bacterial titers in males cause stronger incompatibility. Double and supergroup B infections show most pronounced negative effects on host.

Circadian biology

European show latitudinal in circadian rhythmicity. Virgin females from southern populations (Corsica) have shorter free-running periods (~24.6h) than northern populations (Oulu, ~25.4h). Southern show earlier activity onset, peak, and offset under long ; under short photoperiod, southern wasps begin activity in darkness while northern wasps start at light onset. Circadian clock gene period (per) haplotype frequencies correlate with this clinal variation.

Epigenetics

methylation varies across development: highest in embryo, lowest in larva. of methylation (NvTet, NvDnmt) complements observed patterns. Differentially methylated sites show enrichment for developmentally linked factors, though no clear link with gene expression has been established.

Male fertility and temperature

is synchronized and includes intermediate sperm storage system between and seminal vesicles. Elevated temperature during development alters spermatogenesis and can shift sex ratios through changes in female sex allocation decisions.

Oösorption

Females resorb unlaid when deprived of . Process involves leucine aminopeptidase and esterase from follicle degrading and . Oösorption begins earlier in older females with depleted reserves compared to younger females.