Description of the male of Hymenoepimecis bicolor (Brullé, 1846) (Hymenoptera, Ichneumonidae, Pimplinae)

Sobczak, Jober Fernando; Loffredo, A P S; Penteado-Dias, Angélica María; Messas, Yuri Fanchini; Pádua, Diego Galvão de

doi:10.1590/1519-6984.178889

Cited by 4 publications

(3 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, the determination of progeny sex depending on the host size, which we verified here in H. bicolor , has also previously been reported for other hymenopterans (e.g., Benamú et al, 2020; Charnov et al, 1981; Takasuka et al, 2009), reinforces the assumption that the optimal host size depends on the larva's demands. Since males require fewer resources to develop (Pádua et al, 2015; Sobczak et al, 2019), the optimal host size for this sex can be smaller than for females. The classical Charnov et al (1981) model of sex allocation in parasitoid wasps demonstrates that both females and males should gain reproductive success by being large.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Host size selection and progeny sex determination in Hymenoepimecis bicolor (Hymenoptera, Ichneumonidae, Pimplinae)

et al. 2023

View full text Add to dashboard Cite

Some hymenopteran parasitoids induce intricate behavioral alterations in their spider hosts. Despite these refined adaptations, the success of their attacks and larval development relies on careful host selection. Large hosts will certainly assure the biomass required for the parasitoid larva to pupate, but the selection of large hosts is constrained by the risks involved in the process of host subduing and immobilization.Temporal oscillations in the availability of hosts within the optimal size range may compose another important component of selection. To investigate these issues, we tested the hypothesis that Hymenoepimecis bicolor consistently attacks, and has the reproduction period synchronized with medium-sized individuals of its host, the spider Trichonephila clavipes. We observed that (i) medium-small hosts are preferential victims, (ii) the period of oviposition of H. bicolor is synchronized with the availability of host individuals within these size classes, and (iii) these preferences can be strong enough to remain stable, regarding the temporal variation in the availability of the most suitable hosts. We also reported that (iv) parasitoid females destinate unfertilized eggs to small hosts, which produce male larvae. Data on these aspects allowed us to discuss why there is a preference for specific host sizes. The factors involved include the larval demands, the relative size between the adult wasps and spiders, and the capacity of the hosts to acquire food during larval development.

show abstract

Section: Discussionmentioning

confidence: 99%

“…Since males require fewer resources to develop (Pádua et al, 2015;Sobczak et al, 2019), the optimal host size for this sex can be smaller than for females. The classical Charnov et al (1981) model of sex allocation in parasitoid wasps demonstrates that both females and males should gain reproductive success by being large.…”

Section: F I G U R Ementioning

confidence: 99%

Host size selection and progeny sex determination in Hymenoepimecis bicolor (Hymenoptera, Ichneumonidae, Pimplinae)

et al. 2023

View full text Add to dashboard Cite

show abstract

“…Hymenoepimecis bicolor has a wide geographical distribution, occurring from the Amazon basin (Pádua et al 2015;Sobczak et al 2018) to the southern region of Brazil (pers. obs.).…”

Section: Introductionmentioning

confidence: 99%

Inclusion of an alien species in the host range of the Neotropical parasitoid Hymenoepimecis bicolor (Brullé, 1846) (Hymenoptera, Ichneumonidae)

Gonzaga¹,

Pádua²,

Quero³

2022

JHR

View full text Add to dashboard Cite

In this study we report the first case of an introduced alien host spider species being parasitized and manipulated by an ichneumonid wasp. Hymenoepimecis bicolor, previously described parasitizing exclusively Trichonephila clavipes (Araneidae), was observed parasitizing the European species Cyrtophora citricola (Araneidae) in southeastern Brazil. The cocoon web built by the parasitized spider is composed of a reduced horizontal sheet, which maintains the radial structure. The reduced number of radii and spirals probably reduce the chances of insect interception by these modified structures. In addition, the density of supporting threads is apparently very different between normal and modified webs. The cocoon web spun by C. citricola lacks the protective barrier structure usually observed in cocoon webs spun by parasitized females of T. clavipes. Our observations are in agreement with several predictions of the ecdysteroid hypothesis and represent an interesting opportunity for further investigation of interactions between these parasitoids and their spider hosts.

show abstract

Effects of host size on progeny sex and survivorship of Hymenoepimecis pinheirensis

Xavier,

Gonzaga,

de Castro

et al. 2024

Behavioral Ecology

View full text Add to dashboard Cite

Parasitoid larvae consume their hosts to obtain the nutritional resources required for their development. Parasitoid wasps can optimally select the size of their hosts by laying unfertilised and fertilised eggs according to the amount of biomass available for consumption by the larvae. However, parasitoids may eventually experience low host availability within the optimal range of body sizes, affecting the survival of their offspring. In this study, we identified a situation in which all available hosts (Leucauge volupis) were smaller than those previously observed to be parasitised by Hymenoepimecis pinheirensis at the same study site. Therefore, we investigated how these parasitoids can bypass the scarcity of ideal hosts. Female wasps biased their oviposition toward the largest L. volupis females available. In this suboptimal scenario, they did not oviposit only unfertilised eggs, which developed into relatively small offspring (males). In this situation, they lay fertilised eggs mainly on larger spiders. Larval mortality was high, but the larvae attached to the larger spiders were more likely to complete their development. In general, H. pinheirensis females managed to target the best hosts available, but could not delay the oviposition of fertilised eggs or avoid offspring mortality. Here, we discuss the potential causes of asynchronies in the life cycles of parasitoid wasps and their hosts, the availability of optimal hosts, and how these factors may affect their populations

show abstract

Description of the male of Hymenoepimecis bicolor (Brullé, 1846) (Hymenoptera, Ichneumonidae, Pimplinae)

Cited by 4 publications

References 15 publications

Host size selection and progeny sex determination in Hymenoepimecis bicolor (Hymenoptera, Ichneumonidae, Pimplinae)

Host size selection and progeny sex determination in Hymenoepimecis bicolor (Hymenoptera, Ichneumonidae, Pimplinae)

Inclusion of an alien species in the host range of the Neotropical parasitoid Hymenoepimecis bicolor (Brullé, 1846) (Hymenoptera, Ichneumonidae)

Effects of host size on progeny sex and survivorship of Hymenoepimecis pinheirensis

Contact Info

Product

Resources

About