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... Insects control their flight toward a distant odour source by integrating multimodal sensory information, such as olfactory and visual information. Control of flight speed in orientation flight toward an odour source using visual patterning below has been observed in many species of moths. However, there are few reports about moth flight behaviour over solid‐coloured floors. To examine, which visu ...
... The study of desiccation resistance and its underlying traits is key to understanding species responses to changes in water availability, especially in the context of predicted increases in the frequency and severity of droughts due to climate change. We performed laboratory experiments using dung beetles, important ecosystem service providers, to investigate variations in physiological traits wit ...
... The role of desensitization in mating disruption (MD) of European Grapevine Moth (EGVM), Lobesia botrana (Dennis and Schiffermüller) (Lepidoptera: Tortricidae), is studied by exposing males to different airborne pheromone concentrations for various time intervals prior to evaluate their behavioural response. By using different types of dispensers, male moths are exposed to three decreasing pheromo ...
Verena Strobl; Selina Bruckner; Sarah Radford; Sarah Wolf; Matthias Albrecht; Laura Villamar‐Bouza; Jakkrawut Maitip; Eleonora Kolari; Panuwan Chantawannakul; Gaétan Glauser; Geoffrey R. Williams; Peter Neumann; Lars Straub
... The ubiquitous use of agrochemicals is one driver for the ongoing loss of insect biomass and diversity. Data show that field‐realistic concentrations of neonicotinoid insecticides can negatively affect both population density and the fitness of solitary bees. However, the underlying mechanisms for these effects remain poorly understood. Here, using an established semi‐field experimental set‐up and ...
... Male accessory gland (MAG) secretory proteins affect female reproductive physiology and behaviour when they are delivered to the female at the time of mating along with sperm. In our study, proteomic approaches were used to identify MAG proteins of Leucinodes orbonalis, a monophagous and destructive pest of brinjal. A set of 117 and 186 MAG spots were observed in virgin and mated males, respective ...
Anastrepha ludens; body protein; diet; energy; entomology; females; irradiation; males; mass rearing; methoprene; protein content; sexual maturity; spermatozoa; sterile insect technique; sugars
Abstract:
... Methoprene, a juvenile hormone analog, accelerates male sexual maturation in some pest species controlled through the Sterile Insect Technique (SIT). The SIT consists of the mass‐rearing, irradiation and release of insects into affected areas, where sterile males mate with wild females and render them infertile. Sterile males are held for 6 days in confinement before release, and they are often re ...
... During mating in the Lepidoptera (moths and butterflies), sperm are passed to the female via a copulation in which the male transfers a large and often complex spermatophore over the major part of an hour or more. Subsequently, over the course of an hour or often considerably more, the sperm exit the spermatophore and travel over a relatively complex route to the spermatheca, where the sperm are s ...
... Bark beetles (Coleoptera: Curculionidae: Scolytinae) are a speciose subfamily of weevils that primarily live in bark and consequently largely communicate using sound. Having colonized multiple countries outside its native range, Hylurgus ligniperda (Fabricius) is considered to be a successful invader, yet little is known about its acoustic communication. In the present study, we investigate indivi ...
... The fall armyworm (FAW), Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae), is one of the most important insect pests of corn, sorghum, rice, and grasses. The sex pheromone produced by S. frugiperda is composed of a mixture of esters. In this study, I determined the antennal responses of FAW males from 22 populations in Mexico to the components of the sex pheromone of this species: (Z)‐ ...
... In the present study, the lipid composition from male and female Hylobius abietis is analyzed pre‐ and post‐infection with Beauveria bassiana. The compounds are analyzed by gas chromatography‐mass spectrometry. In the lipids of males and females fatty acids, fatty acid methyl esters, alcohols, amino acids and other organic compounds are identified. The lipids of males and females after B. bassiana ...
... Parental care patterns increase offspring fitness but may drive energetic costs to parents. The costs associated with parental care can change over time, decreasing the condition of parents that experience prolonged parental care. Thus, males can modulate parental effort based in the relative fitness cost/benefit pay‐offs under different stages and environmental conditions. The present study asses ...
Calliptamus; energy; females; flight; glycogen; juvenile hormones; locusts; males; migratory behavior; ovarian development; steppes; triacylglycerols; Central Asia
Abstract:
... Calliptamus italicus L. is a major migratory pest that often causes serious agricultural losses in the desert/semi‐desert steppe of Central Asia. The present study aims to understand the physiological factors that affect migration of C. italicus by examining the relationships between flight capacity, energy accumulation, ovarian development and Juvenile hormone (JH) titre. The results show that fl ...
... To more effectively manage walnut husk fly Rhagoletis completa (Diptera: Tephritidae), in California walnut orchards, it is important to understand the factors that affect the timing of adult emergence. In the present study, we examine the effects of incubation temperature, pre‐chill and chill durations, latitude, cultivar and size on the post‐diapause development of R. completa puparia. The lower ...
Curculionidae; Dendroctonus ponderosae; Pinus; carbohydrates; colorimetry; energy; females; flight; habitats; insect control; lipids; males; metabolites; pests; protein content; proteins; North America
Abstract:
... The mountain pine beetle Dendroctonus ponderosae Hopkins is a major native pest of Pinus Linnaeus (Pinaceae) in western North America. Host colonization by the mountain pine beetle is associated with an obligatory dispersal phase, during which beetles fly in search of a suitable host. Mountain pine beetles use stored energy from feeding in the natal habitat to power flight before host colonization ...
... Access to balanced nutrition enables optimum health and development, body repair, fat storage, increased fecundity and longevity. In the present study, we assessed the responses of a generalist leaf feeder (the phasmid Extatosoma tiaratum) reared continuously on one of three host plants, tree lucerne (Chamaecyisus palmensis), bramble (Rubus fruticosus) and Eucalyptus species, in a low fluctuating ...
Mythimna separata; exposure duration; females; green light; imagos; insect larvae; insect pests; juvenile hormones; males; moths; phototaxis; pupae; rearing; scotophase; wavelengths; East Asia
Abstract:
... The oriental armyworm Mythimna separata is an agricultural insect pest in Eastern Asia. Mythimna separata moths have a high phototactic response to green (520 nm) light. The biological characteristics of insects living under light of a specific wavelength at night can change and, accordingly, Juvenile hormone (JH) levels may be influenced by this light. The present study evaluates changes in the t ...
... It is widely accepted that male age can influence female mating preference and subsequent fitness consequences in many polyandrous species, yet this is seldom investigated in monandrous species. In the present study, we use the monandrous pine moth Dendrolimus punctatus to examine the effects of male age on female mating preference and future reproductive potential. In multiple male trials, when p ...
Ostrinia furnacalis; body size; dimorphism; empirical research; females; insect larvae; larval development; males; pupae; rearing; temperature
Abstract:
... Empirical studies demonstrate a negative relationship between body size and temperature [i.e. the temperature‐size rule (TSR)] and a positive relationship between body size and development time (a trade‐off). However, many exceptions are also reported. The present study tests the two relationships in a tropical population of the Asian corn borer Ostrinia furnacalis under a wide range of temperatur ...
... We investigate the response profiles of the antennal olfactory sensory neurones (OSNs) in male and female gorse pod moth Cydia succedana to host and nonhost volatiles, using the single sensillum recording technique. Eight different classes of olfactory sensilla are identified in female C. succedana and five different classes of olfactory sensilla in males. Nineteen different classes of OSNs are id ...
... The cold hardiness of arthropods is an important characteristic associated with overwintering success. Cold‐tolerant stages affect overwintering strategy, especially in arthropods that continuously feed on evergreen host plants in temperate regions. However, cold hardiness to mildly low temperature is rarely investigated. In the present study, we estimate the stage‐specific cold hardiness of a pop ...
... Life‐history strategies are diverse both across and within species, although the factors shaping this diversity are not fully understood. In the present study, we investigate the life‐history strategies of the marula fruit fly Ceratitis cosyra (Walker) (Diptera: Tephritidae) and how they differ between the sexes. We measure lifespan and age‐dependent reproductive effort in both sexes. In females, ...
Tetranychus urticae; arthropods; cold; cold tolerance; diapause; females; field experimentation; juveniles; life history; males; models; mortality; overwintering; pest control; pests; prediction; risk assessment; supercooling; supercooling point
Abstract:
... Lethal time₅₀ (LTime₅₀) and lethal temp (LTemp₅₀) are commonly used laboratory indices of arthropod cold tolerance, with the former often being employed to predict winter survival in the field. In the present study, we compare the cold tolerance of different life‐history stages (nondiapausing and diapausing females, as well as males and juveniles) of a major agricultural pest: the two‐spot spider ...
... The effect of delayed female mating for the mushroom fungus gnat Lycoriella ingenua is investigated. We examine the effect of delaying female mating on the fertility and egg viability of female flies that have a mating delay of 0–5 days after emergence. Male fly age is held constant. Female age does not impact male acceptance and most flies copulate within seconds of pairing. We find that female f ...
... The detoxification enzymes superfamilies of cytochrome P450 (P450), glutathione S‐transferase (GST) and carboxylesterase (CoE) play important roles in the metabolism of xenobiotics and endogenous substrates. Despite their importance in insect physiology and ecology, the relative activities of these enzyme systems among developmental stages, sexes and tissues of insect species have not been studied ...
Nicrophorus vespilloides; biochemical pathways; body weight; brood rearing; dead animals; energy; females; males; nutritional adequacy; sex pheromones; symbionts; vertebrates
Abstract:
... Recent studies demonstrate that pheromones can be costly to produce and emit and, therefore, the types and quantities that they express are likely to covary with individual condition. Previous experiments reveal that, when given the opportunity to breed and care for young, male burying beetles Nicrophorus vespilloides go on to produce a higher amount of their sex pheromone and attract more females ...
Cardiocondyla obscurior; females; longevity; males; mass spectrometry; proteinase inhibitors; proteinases; seminal plasma proteins; social insects; solitary insects; sperm competition; two-dimensional gel electrophoresis
Abstract:
... Seminal fluid proteins are important agents in sperm competition and sexual conflict. In solitary insects, males and females may have different interests concerning the outcome of a mating episode, and males may use seminal fluid to manipulate the physiology and behaviour of the female against the latter's fitness interests. Less is known about the role of seminal fluids in social insects, where t ...
... Adult Aleochara bipustulata L. and Aleochara bilineata Gyllenhal (Coleoptera: Staphylinidae) are predatory on immature stages of cabbage root fly Delia radicum (L.) (Diptera: Anthomyiidae). Larvae of the two Aleochara are parasitoids of D. radicum pupae. Female Aleochara lay eggs near D. radicum puparia; the newly‐hatched Aleochara larvae enter puparia and consume the contents. Delia radicum‐infes ...
... We investigate the effects of diapause on post‐diapause development, reproductive physiology and population growth of Chilo partellus (Swinhoe) (Crambidae: Lepidoptera). Aestivating and hibernating larvae of C. partellus are exposed to diapause terminating conditions (consisting of an LD 12 : 12 h photocycle at 27 ± 1 °C and 65 ± 5% relative humidity with a fresh diet) to terminate the diapause an ...
Candidatus Liberibacter asiaticus; Citrus; Diaphorina citri; Diptera; RNA interference; adults; eggs; females; gene expression; genes; greening disease; hatching; insects; males; pests; progeny; reverse transcriptase polymerase chain reaction; sex determination; sex ratio; sexual development
Abstract:
... Asian citrus psyllid Diaphorina citri Kuwayama is the vector of Candidatus Liberibacter asiaticus (CLas), the causal agent of citrus huanglongbing (HLB). A comprehensive understanding of molecular components that govern key physiological traits in D. citri would promote the development of novel genetic control strategies to fight this pest. In the present study, a transformer 2 homologue (Dctra‐2) ...
... The fertility gene boule is conserved in most organisms and deletion of boule is found to block meiosis during spermatogenesis, which contributes to male infertility. The biological role of boule in Asian citrus psyllid Diaphorina citri, currently the most serious citrus pest and the vector of huanglongbing (HLB) pathogen, remains poorly understood. In the present study, a boule homologue in Diaph ...
... Carbon dioxide (CO₂) as a greenhouse gas has been increasing in recent decades. Because an elevated atmospheric CO₂ influences insect physiology and behaviour, we hypothesize that pheromone–mediated communication in the moth is affected by an increased CO₂ level. We test the behavioural responses of male Helicoverpa armigera to sex pheromone in a wind tunnel, demonstrating a significant reduction ...
... Mating in arthropods is costly and has negative effects on survival. Such effects are often more strongly expressed when individuals are simultaneously exposed to other stress sources. Consequently, the behaviour of virgin and mated individuals often differs. Mated females, for example, search for suitable oviposition sites, whereas virgin females search more for mates. In the present study, we ex ...
... Seminal fluid proteins (SFPs) produced in the male accessory glands and ejaculatory duct are subject to strong sexual selection, often evolve rapidly and therefore may play a key role in reproductive isolation and species formation. However, little is known about reproductive proteins for species in which males transfer ejaculate to females using a spermatophore package. By combining RNA sequencin ...
... Secondary sexual traits can be indicators of individual condition that may present seasonal polyphenism as a result of the differential costs of expression along the season. Wing spots in male damselflies of the Calopterygidae family are secondary sexual traits associated with intrasexual competition and mate choice. Hetaerina titia Drury is a calopterygid damselfly where males show red and black ...
... The sexual and host‐related behaviours of the fruit fly Anastrepha obliqua Macquart (Diptera: Tephritidae) are mediated by volatile compounds. However, whether the physiological state of this species affects its antennal and behavioural responses to semiochemicals is unknown. The effects of age, mating status, diet and the topical application of methoprene, a Juvenile hormone analogue (JHA), on th ...
Poecilimon; females; genome; insects; males; mass spectrometry; proteins; proteomics; spermatophores; two-dimensional gel electrophoresis
Abstract:
... Nuptial gifts are male mating investments, which, in bushcrickets, comprise the sperm‐containing ampulla and the attached spermatophylax. The functions of the spermatophylax are to deter females from premature removal of the sperm‐containing ampulla, which is a nutrient resource for females, as well as a source of compounds that influence female behaviour to increase male evolutionary fitness. Pla ...
... Female multiple mating (polyandry) is widespread across Insecta, even if mating can be costly to females. To explain the evolution and maintenance of polyandry, several hypotheses, mainly focusing on the material (direct) and/or the genetic (indirect) benefits, have been proposed and empirically tested in many species. Considering only the direct benefits, repeatedly‐mated females are expected to ...
... Ecotherms adjust their physiology to environmental temperatures. Long‐term exposures to heat or cold typically induce acclimation responses that generate directional, but reversible shifts in thermal tolerance and performance. However, less is known about how short exposure in different life stages will affect the adult phenotype. In the present study, we compared the effects of long‐term temperat ...
... Males of the potato tuberworm moth Phthorimaea operculella (Lepidoptera: Gelechiidae) locate conspecific females by a series of short and straight flights, or ‘hops’. On the floor of a wind tunnel, P. operculella can change their heading angles in response to wind direction shift, suggesting that they detect wind direction and orient upwind when on the ground. It is unlikely that they navigate in ...
Phorodon humuli; autumn; females; field experimentation; flight; hops; insect flight; males; morphs; pheromone traps; sex pheromones; wind direction
Abstract:
... The attraction range of olfactory response by winged female gynoparae (autumn migrants that give birth to oviparae, the sexual females) and male damson–hop aphids Phorodon humuli (Schrank) is investigated in field experiments over 2 years by analyzing the spatial patterns of catches in concentric circles of yellow‐painted traps (60 in total) around a central trap releasing the species' sex pheromo ...
Leptinotarsa decemlineata; X chromosome; crossing; diapause; genes; genetic traits; hybrids; insects; males; phenology; photoperiod; rearing; sex determination
Abstract:
... Photoperiod is a reliable indicator of season and an important cue that many insects use for phenological synchronization. Undergoing range expansion insects can face a change in the local photoperiod to which they need to resynchronize. Rapid range expansion can be associated with rapid photoperiodic adaptation, which can be associated with intense selection on strongly heritable polygenic traits ...
Drosophila melanogaster; circadian rhythm; females; fruit flies; longevity; males; mutants; phenotype; reproductive performance; temperature
Abstract:
... Circadian clocks regulate the daily temporal structure of physiological and behavioural functions. In the fruit fly Drosophila melanogaster Meigen, disruption of daily rhythms is suggested to reduce the fly's lifespan. In the present study, because pairs of mixed‐sex flies are known to show an activity pattern different from that of individual flies, this hypothesis is tested by measuring the life ...
... Ageing can reduce the probability that individuals reproduce. The present study investigates whether ageing influences the mating frequency of mass‐reared fertile and sterile Mexican fruit flies Anastrepha ludens (Loew). The ability of males of different ages to inhibit female remating is also determined, and the growth of male reproductive organs is measured as they age. Young males (6 days old) ...
... Lepidopteran males produce two sperm types: nucleated eupyrene sperm and non‐nucleated apyrene sperm. Although apyrene sperm are infertile, both sperm types migrate from the spermatophore to the spermathecal after copulation. As a dominant adaptive explanation for migration of apyrene sperm in polyandrous species, the cheap filler hypothesis suggests that the presence of a large number of motile a ...
... The ash leaf cone roller Caloptilia fraxinella Ely (Lepidoptera: Gracillariidae) is an invasive leaf‐mining moth pest of horticultural ash Fraxinus spp. in the Canadian Prairie Provinces. Caloptilia fraxinella overwinter as adults in reproductive diapause and mating occurs after overwintering in the spring. The effect of a carbohydrate food source on fat and glycerol reserves throughout the long a ...
... Larvae of Dendrocerus carpenteri Curtis (Hymenoptera: Megaspilidae) develop as solitary ectoparasitoids on the prepupae and pupae of primary aphid parasitoids inside the aphid mummy. First instars are aggressive and kill potential competitors; however, facultative gregarious development of two, and occasionally three, larvae may occur under superparasitism. To test the hypothesis that gregarious l ...
... The present study investigates the effects of age and mating status on the circadian variations of gland sex pheromone titre in female Spodoptera litura Fabricius. Similar to other nocturnal moths, S. litura females exhibit circadian variations of gland sex pheromone contents, with higher levels during scotophase and lower levels during photophase. The sex pheromone titre in the glands peaks durin ...
... Communication with substrate‐borne vibrational signals is common in the family Pentatomidae, although this aspect of biology of the invasive pest Halyomorpha halys Stål remains unexplored so far. In the present study, the behaviour of single animals and pairs is observed on a bean plant and a loudspeaker membrane at the same time as recording substrate vibrations with a laser vibrometer, with the ...
... Accurate and timely surveillance of bed bug infestations is critical for the development of effective control strategies. Although the bed bug‐produced volatiles (E)‐2‐hexenal and (E)‐2‐octenal are considered as defensive secretions, the present study demonstrates, using ethovision® video‐tracking software (Noldus Information Technology Inc., Leesburg, Virginia), that low amounts of these commerci ...
... To survive, an animal must respond to the environmental stimuli (Zeitgebers) precisely coinciding with a 24‐h light/dark cycle. In human habitats, both natural and artificial Zeitgebers intermingle, entraining the circadian clocks of animals. Whether a circadian clock can respond to Zeitgebers effectively is closely related to the level of adaptive competitiveness. In the present review, the Germa ...