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Journal of Chemical Ecology

Ashraf M El-Sayed, Júlia K Jósvai, Robert L Brown, Andrew Twidle, David M Suckling
The ability of insects to associate olfactory cues with food from their environment has been well documented with various insect orders. However, these studies were based on prior training of insects to associate odors with food sources in the laboratory or in the field with almost no evidence for the development of this phenomenon in natural ecosystems. In New Zealand's ancient Fuscospora spp. or beech forests, invasive Vespula social wasps were attracted to odor from honeydew (benzaldehyde and n-octanol) but did not respond to a known wasp attractant (isobutanol and acetic acid)...
July 19, 2018: Journal of Chemical Ecology
Iris Steitz, Callum Kingwell, Robert J Paxton, Manfred Ayasse
Chemical communication is crucial for the maintenance of colony organization in eusocial insects and chemical signals are known to mediate important aspects of their social life, including the regulation of reproduction. Sociality is therefore hypothesized to be accompanied by an increase in the complexity of chemical communication. However, little is known about the evolution of odor signals at the transition from solitary living to eusociality. Halictid bees are especially suitable models to study this question as they exhibit considerable variability in social behavior...
July 17, 2018: Journal of Chemical Ecology
C Marneweck, A Jürgens, A M Shrader
Many mammals enhance their olfactory signals visually by depositing them in conspicuous locations such as well-travelled paths. It is also possible to enhance the odour itself through behaviours aimed at modifying odour emission rates. White rhinos defecate in communal middens. While defecating, territorial males kick sharply with their back feet which disperses their dung. Despite being a ubiquitous trait of territorial male white rhinos, the reason behind this behaviour is unclear. We hypothesised that the purpose of dung kicking was for olfactory signal amplification (OSA) in terms of an increased emission of volatile compounds (i...
July 16, 2018: Journal of Chemical Ecology
Etya Amsalem, Abraham Hefetz
No abstract text is available yet for this article.
July 16, 2018: Journal of Chemical Ecology
Le Van Vang, Qi Yan, Nguyen Thi Ngoc Nghia, Chau Nguyen Quoc Khanh, Tetsu Ando
Leucinodes orbonalis is one of the most damaging insect pests affecting eggplant in the Mekong Delta of Vietnam. While (E)-11-hexadecenyl acetate (E11-16:OAc) and its alcohol, (E)-11-hexadecenol (E11-16:OH), have been identified as major and minor sex pheromone components, respectively, few males were attracted to a blend of these compounds in Vietnamese fields. In order to utilize synthetic pheromone of L. orbonalis as a tool for sustainable pest management programs, we reexamined the pheromone of this species in order to search for other minor components...
July 13, 2018: Journal of Chemical Ecology
Holly A Coombes, Paula Stockley, Jane L Hurst
Chemical communication plays many key roles in mammalian reproduction, although attention has focused particularly on male scent signalling. Here, we review evidence that female chemical signals also play important roles in sexual attraction, in mediating reproductive competition and cooperation between females, and in maternal care, all central to female reproductive success. Female odours function not only to advertise sexual receptivity and location, they can also have important physiological priming effects on male development and sperm production...
July 11, 2018: Journal of Chemical Ecology
Ikkei Shikano, Qinjian Pan, Kelli Hoover, Gary W Felton
Plants can influence the effectiveness of microbial insecticides through numerous mechanisms. One of these mechanisms is the oxidation of plant phenolics by plant enzymes, such as polyphenol oxidases (PPO) and peroxidases (POD). These reactions generate a variety of products and intermediates that play important roles in resistance against herbivores. Oxidation of the catecholic phenolic compound chlorogenic acid by PPO enhances the lethality of the insect-killing bacterial pathogen, Bacillus thuringiensis var...
July 6, 2018: Journal of Chemical Ecology
Miri Dainson, Melissa Mark, Marouf Hossain, Barney Yoo, Mande Holford, Shannon E McNeil, Christina Riehl, Mark E Hauber
Hosts of avian brood parasites often use visual cues to reject foreign eggs, and several lineages of brood parasites have evolved mimetic eggshell coloration and patterning to circumvent host recognition. What is the mechanism of parasitic egg color mimicry at the chemical level? Mimetic egg coloration by Common Cuckoos Cuculus canorus is achieved by depositing similar concentrations of colorful pigments into their shells as their hosts. The mechanism of parasitic egg color mimicry at the chemical level in other lineages of brood parasites remains unexplored...
July 6, 2018: Journal of Chemical Ecology
Anna K Undas, Florian Weihrauch, Anton Lutz, Rob van Tol, Thierry Delatte, Francel Verstappen, Harro Bouwmeester
Phorodon humuli (Damson-hop aphid) is one of the major pests of hops in the northern hemisphere. It causes significant yield losses and reduces hop quality and economic value. Damson-hop aphid is currently controlled with insecticides, but the number of approved pesticides is steadily decreasing. In addition, the use of insecticides almost inevitably results in the development of resistant aphid genotypes. An integrated approach to pest management in hop cultivation is therefore badly needed in order to break this cycle and to prevent the selection of strains resistant to the few remaining registered insecticides...
July 6, 2018: Journal of Chemical Ecology
Sandra Steiger, Johannes Stökl
Beetles have evolved diverse strategies to cope with environmental challenges. Although parents of the vast majority of beetle species do not take care of their offspring, there are some species, in which parents provide elaborate post-hatching care and remain temporarily associated with their offspring to defend them from competitors or to provision them with food. Usually, socially induced reproductive "control" is a core feature of eusocial societies, but here we highlight that already in small family groups, socially induced reproductive regulation can play a fundamental role...
July 4, 2018: Journal of Chemical Ecology
Onno W Calf, Heidrun Huber, Janny L Peters, Alexander Weinhold, Yvonne Poeschl, Nicole M van Dam
Solanum dulcamara (Bittersweet nightshade) shows significant intraspecific variation in glycoalkaloid (GA) composition and concentration. We previously showed that constitutive differences in overall GA levels are correlated with feeding preference of the grey field slug (GFS; Deroceras reticulatum). One particularly preferred accession, ZD11, contained low GA levels, but high levels of previously unknown structurally related uronic acid conjugated compounds (UACs). Here we test whether different slug species as well as insect herbivores show similar feeding preferences among six S...
July 2, 2018: Journal of Chemical Ecology
Jianrong Wei, Qiong Zhou, Loyal Hall, Andrew Myrick, Kelli Hoover, Kathleen Shields, Thomas C Baker
We performed single-sensillum recordings from male and female antennae of the Asian longhorned beetle, Anoplophora glabripennis, that included as stimuli the two components of this species' aggregation-sex pheromone in addition to various general odorants. We compared the aggregation-sex-pheromone-component responses of olfactory sensory neurons (OSNs) to those of OSNs that responded to a variety of plant-related odorants. In the smooth-tipped, tapered, trichoid sensilla on the most distal antennal flagellomeres nos...
June 29, 2018: Journal of Chemical Ecology
Lina Castano-Duque, Anjel Helms, Jared Gregory Ali, Dawn S Luthe
In this study we examined global changes in protein expression in both roots and leaves of maize plants attacked by the root herbivore, Western corn rootworm (WCR, Diabrotica virgifera virgifera). The changes in protein expression Are indicative of metabolic changes during WCR feeding that enable the plant to defend itself. This is one of the first studies to look above- and below-ground at global protein expression patterns of maize plants grown in soil and infested with a root herbivore. We used advanced proteomic and network analyses to identify metabolic pathways that contribute to global defenses deployed by the insect resistant maize genotype, Mp708, infested with WCR...
June 21, 2018: Journal of Chemical Ecology
Dong H Cha, Thomas H Q Powell, Jeffrey L Feder, Charles E Linn
A new blend of volatiles was identified for the fruit of downy red hawthorn, Crataegus mollis, that is attractive to Rhagoletis pomonella flies infesting this host in the northeastern USA. The new blend was as attractive as the previously identified mixture but is more complex in the number of odorants (six in the old versus ten in the new) and differs significantly in the ratio of three volatiles, 3-methylbutan-1-ol, butyl hexanoate, and dihydro-β-ionone, that are common to both blends and exerted agonist or antagonist effects on behavior in a flight tunnel assay...
June 20, 2018: Journal of Chemical Ecology
Jie Wang, Mingyu Yang, Yuanyuan Song, Flor E Acevedo, Kelli Hoover, Rensen Zeng, Gary W Felton
The original version of this article unfortunately contained a mistake. Fig. 3 and Fig. 4a were identical and the original version of Fig. 4a had been accidentally replaced.
June 13, 2018: Journal of Chemical Ecology
Stephen J Martin, Maria E Correia-Oliveira, Sue Shemilt, Falko P Drijfhout
Cuticular hydrocarbons (CHCs) function as recognition compounds with the best evidence coming from social insects such as ants and honey bees. The major exocrine gland involved in hydrocarbon storage in ants is the post-pharyngeal gland (PPG) in the head. It is still not clearly understood where CHCs are stored in the honey bee. The aim of this study was to investigate the hydrocarbons and esters found in five major worker honey bee (Apis mellifera) exocrine glands, at three different developmental stages (newly emerged, nurse, and forager) using a high temperature GC analysis...
June 7, 2018: Journal of Chemical Ecology
Irene Villalta, Silvia Abril, Xim Cerdá, Raphael Boulay
Ant queen pheromones (QPs) have long been known to affect colony functioning. In many species, QPs affect important reproductive functions such as diploid larvae sexualization and egg-laying by workers, unmated queens (gynes), or other queens. Until the 1990s, these effects were generally viewed to be the result of queen manipulation through the use of coercive or dishonest signals. However, in their seminal 1993 paper, Keller and Nonacs challenged this idea, suggesting that QPs had evolved as honest signals that informed workers and other colony members of the queen's presence and reproductive state...
June 2, 2018: Journal of Chemical Ecology
Nelson L Mwando, Amanuel Tamiru, Johnson O Nyasani, Meshack A O Obonyo, John C Caulfield, Toby J A Bruce, Sevgan Subramanian
Maize lethal necrosis is one of the most devastating diseases of maize causing yield losses reaching up to 90% in sub-Saharan Africa. The disease is caused by a combination of maize chlorotic mottle virus (MCMV) and any one of cereal viruses in the Potyviridae group such as sugarcane mosaic virus. MCMV has been reported to be transmitted mainly by maize thrips (Frankliniella williamsi) and onion thrips (Thrips tabaci). To better understand the role of thrips vectors in the epidemiology of the disease, we investigated behavioral responses of F...
June 2, 2018: Journal of Chemical Ecology
Jacques Pasteels, Nelida E Gomez
No abstract text is available yet for this article.
May 26, 2018: Journal of Chemical Ecology
Patrick Lhomme, Heather M Hines
In eusocial insects, the high cost of altruistic cooperation between colony members has favoured the evolution of cheaters that exploit social services of other species. In the most extreme forms of insect social parasitism, which has evolved multiple times across most social lineages, obligately parasitic species invade the nests of social species and manipulate the workforce of their hosts to rear their own reproductive offspring. As alien species that have lost their own sociality, these social parasites still face social challenges to infiltrate and control their hosts, thus providing independent replicates for understanding the mechanisms essential to social dominance...
May 22, 2018: Journal of Chemical Ecology
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