Search results for "wasp"
showing 10 items of 102 documents
Female-released sex pheromones mediating courtship behavior in Lysiphlebus testaceipes males.
2013
Ethological aspects and chemical communication at close-range between the sexes of Lysiphlebus testaceipes Cresson (Hymenoptera: Braconidae) have been investigated through behavioral bioassays and chemical analysis. The attractiveness toward males of whole-body extracts of females and males in hexane and acetone was evaluated, adopting male fanning behavior as a key behavioral component. Also, the activity of polar and nonpolar fraction of female-body extract in hexane obtained using solid-phase extraction technique was investigated. In order to identify cuticular compounds, male and female whole-body extracts with hexane and acetone were analyzed by gas chromatography-mass spectrometry. Th…
Wasp venom injected into the prey's brain modulates thoracic identified monoaminergic neurons.
2005
The wasp Ampulex compressa injects a cocktail of neurotoxins into the brain of its cockroach prey to induce an enduring change in the execution of locomotory behaviors. Our hypothesis is that the venom injected into the brain indirectly alters the activity of monoaminergic neurons, thus changing the levels of monoamines that tune the central synapses of locomotory circuits. The purpose of the present investigation was to establish whether the venom alters the descending control, from the brain, of octopaminergic neurons in the thorax. This question was approached by recording the activity of specific identified octopaminergic neurons after removing the input from the brain or after a wasp s…
Description of Dryocosmus destefanii new species (Hymenoptera: Cynipidae: Cynipini) from Quercus suber L. in Italy
2018
A new species, Dryocosmus destefanii Cerasa & Melika n. sp. associated with a Cerris section oak, Quercus suber L., is described from Italy. Description, diagnosis, host associations and biology for the new species and an illustrated identification key to the Western Palaearctic Dryocosmus species are given. The description is supported by morphological and molecular data.
Supplementary material 1 from: Komonen A, Torniainen J (2022) All-day activity of Dolichovespula saxonica (Hymenoptera, Vespidae) colonies in Central…
2022
Tables S1, S2, Figures S1–S4
Attraction of egg-killing parasitoids toward induced plant volatiles in a multi-herbivore context
2015
In response to insect herbivory, plants emit volatile organic compounds which may act as indirect plant defenses by attracting natural enemies of the attacking herbivore. In nature, plants are often attacked by multiple herbivores, but the majority of studies which have investigated indirect plant defenses to date have focused on the recruitment of different parasitoid species in a single-herbivore context. Here, we report our investigation on the attraction of egg parasitoids of lepidopteran hosts (Trichogramma brassicae and T. evanescens) toward plant volatiles induced by different insect herbivores in olfactometer bioassays. We used a system consisting of a native crucifer, Brassica nigr…
Identification and analysis of security risks of the Information system and website
2021
2ANOTĀCIJA Darba mērķis ir izanalizēt izplatītākos drošības riskus tīmekļvietnēm un informācijas sistēmām, nosakot tos, veikt ielaušanas testēšanu uz noteikto tīmekļvietni. Tēma ir īpaši aktuāla, jo mūsdienu pasaulē ar tehnoloģiju attīstību un arī Covid-19 laikā vie tnes arvien vairāk sāk sniegt tiešsaistes pakalpojumus. Tīmekļvietnes apstrādā un glabā lietotāju sensitīvo informāciju un nevar būt 100% droša,līdz ar ko krāpnieku interese pieaug. Darb ā ir izanalizētamūsdienas drošības situācija,statistika par tīmekļvietnēm, kā arī izmantojot OWASP datus ir noskaidroti visizplatītākie drošības riski un drošības līdzekļi pret tiem. Izmantojot informāciju par drošības riskiem,darba ietvaros ir …
OWASP Top 10 -haavoittuvuuksien korjaaminen TIM-järjestelmästä
2015
Modernit web-sovellukset ovat monimutkaisia, minkä vuoksi ne voivat sisältää erilaisia haavoittuvuuksia. Jyväskylän yliopiston tietotekniikan laitoksella on kehitteillä The Interactive Material -järjestelmä, johon tallennetut dokumentit voivat sisältää interaktiivisia komponentteja ja jossa opiskelijat voivat esimerkiksi tehdä luentomonisteeseen omia muistiinpanojaan. Tutkielmassa käydään läpi web-sovellusten yleisimmät haavoittuvuudet OWASP-organisaation Top 10 -listan mukaan ja selvitetään, mitä näistä haavoittuvuuksista TIM-järjestelmän nykyisessä versiossa on ja kuinka ne voidaan järkevästi korjata. Haavoittuvuuskartoituksessa sovelletaan sekä penetraatiotestausta että lähdekoodin syste…
Wild olive seed weevil in South Africa, Anchonocranus oleae Marshall (Coleoptera Curculionidae), a rediscovery after a century
2019
The wild olive seed weevil, Anchonocranus oleae Marshall, 1912 was not found after its description and the study of its biology by Silvestri in 1915. Recently, A. oleae larvae were found alive inside the kernels of wild olives (O. europaea subsp. cuspidata) collected from trees between 2009 and 2012 in the Western Cape, South Africa. No weevil larvae were found in cultivated olives collected during the same period. Only two adult weevils emerged from olives collected on the tree and on the ground. Over the sampling period 20 adults were collected directly on wild olive trees at different sites in the Western Cape and one in the Eastern Cape. All adults were shown to be conspecific with the …
Behavioral and Chemical Investigations of Contact Kairomones Released by the Mud Dauber Wasp Trypoxylon politum, a Host of the Parasitoid Melittobia …
2011
Contact kairomones from the host mud dauber wasp Trypoxylon politum Say (Hymenoptera: Crabronidae) that mediate behavioral responses of its ectoparasitoid Melittobia digitata Dahms (Hymenoptera: Eulophidae) were investigated. Chemical residues from host by-products, the cocoon, and the meconium, induced arrestment behavior of macropterous female parasitoids, while those from the host stage attacked, i.e., the prepupa, did not. Melittobia digitata response to polar and apolar extracts of host by-products indicated kairomone(s) solubility mainly in hexane. GC and GC/MS analysis of cocoon and meconium apolar extracts revealed a mixture of linear carboxylic acids from C(6) to C(18), and both ex…
Learning can be detrimental for a parasitic wasp
2021
Animals have evolved the capacity to learn, and the conventional view is that learning allows individuals to improve foraging decisions. The parasitoid Telenomus podisi has been shown to parasitize eggs of the exotic stink bug Halyomorpha halys at the same rate as eggs of its coevolved host, Podisus maculiventris, but the parasitoid cannot complete its development in the exotic species. We hypothesized that T. podisi learns to exploit cues from this non-coevolved species, thereby increasing unsuccessful parasitism rates. We conducted bioassays to compare the responses of naïve vs. experienced parasitoids on chemical footprints left by one of the two host species. Both naïve and experienced …