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Journal of Chemical Ecology

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https://www.readbyqxmd.com/read/28405915/does-aphid-infestation-interfere-with-indirect-plant-defense-against-lepidopteran-caterpillars-in-wild-cabbage
#1
Yehua Li, Berhane T Weldegergis, Surachet Chamontri, Marcel Dicke, Rieta Gols
Attraction of parasitoids to plant volatiles induced by multiple herbivory depends on the specific combinations of attacking herbivore species, especially when their feeding modes activate different defense signalling pathways as has been reported for phloem feeding aphids and tissue feeding caterpillars. We studied the effects of pre-infestation with non-host aphids (Brevicoryne brassicae) for two different time periods on the ability of two parasitoid species to discriminate between volatiles emitted by plants infested by host caterpillars alone and those emitted by plants infested with host caterpillars plus aphids...
April 12, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28393296/localization-of-defensive-chemicals-in-two-congeneric-butterflies-euphydryas-nymphalidae
#2
Peri A Mason, M Deane Bowers
Many insect species sequester compounds acquired from their host plants for defense against natural enemies. The distribution of these compounds is likely to affect both their efficacy as defenses, and their costs. In this study we examined the distribution of sequestered iridoid glycosides (IGs) in two congeneric species of nymphalid butterfly, Euphydryas anicia and E. phaeton, and found that the pattern of localization of IGs differed between the two species. Although IG concentrations were quite high in the heads of both species, the relative concentrations in wings and abdomens differed substantially...
April 10, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28386801/diploid-male-production-results-in-queen-death-in-the-stingless-bee-scaptotrigona-depilis
#3
Ayrton Vollet-Neto, Ricardo C Oliveira, Sharon Schillewaert, Denise A Alves, Tom Wenseleers, Fabio S Nascimento, Vera L Imperatriz-Fonseca, Francis L W Ratnieks
As in most Hymenoptera, the eusocial stingless bees (Meliponini) have a complementary sex determination (CSD) system. When a queen makes a "matched mating" with a male that shares a CSD allele with her, half of their diploid offspring are diploid males rather than females. Matched mating imposes a cost, since diploid male production reduces the colony workforce. Hence, adaptations preventing the occurrence or attenuating its effects are likely to arise. Here we provide clear evidence that in the stingless bee Scaptotrigona depilis, the emergence of diploid males induces queen death, and this usually occurs within 10-20 days of the emergence of diploid male offspring from their pupae...
April 6, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28386800/chemical-ecology-of-stingless-bees
#4
Sara Diana Leonhardt
Stingless bees (Hymenoptera, Apidae: Meliponini) represent a highly diverse group of social bees confined to the world's tropics and subtropics. They show a striking diversity of structural and behavioral adaptations and are important pollinators of tropical plants. Despite their diversity and functional importance, their ecology, and especially chemical ecology, has received relatively little attention, particularly compared to their relative the honeybee, Apis mellifera. Here, I review various aspects of the chemical ecology of stingless bees, from communication over resource allocation to defense...
April 6, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28374224/effects-of-insect-herbivory-on-bilberry-production-and-removal-of-berries-by-frugivores
#5
Tuuli-Marjaana Koski, Marika Kalpio, Toni Laaksonen, Päivi M Sirkiä, Heikki P Kallio, Baoru Yang, Kaisa M Linderborg, Tero Klemola
The evolutionary purpose of a fleshy fruit is to attract seed dispersers and get the seeds dispersed by frugivorous animals. For this reason, fruits should be highly rewarding to these mutualists. However, insect herbivory can alter plant reproductive success e.g. by decreasing fruit yield or affecting the attractiveness of the fruits to mutualistic seed dispersers. Under natural conditions, we tested the effects of experimental larval-defoliation on berry ripening and consumption of a non-cultivated dwarf shrub, the bilberry (Vaccinium myrtillus L...
April 3, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28367596/oxidizable-phenolic-concentrations-do-not-affect-development-and-survival-of-paropsis-atomaria-larvae-eating-eucalyptus-foliage
#6
Karen J Marsh, Wufeng Zhou, Hannah J Wigley, William J Foley
Insect folivores can cause extensive damage to plants. However, different plant species, and even individuals within species, can differ in their susceptibility to insect attack. Polyphenols that readily oxidize have recently gained attention as potential defenses against insect folivores. We tested the hypothesis that variation in oxidizable phenolic concentrations in Eucalyptus foliage influences feeding and survival of Paropsis atomaria (Eucalyptus leaf beetle) larvae. First we demonstrated that oxidizable phenolic concentrations vary both within and between Eucalyptus species, ranging from 0 to 61 mg...
April 3, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28357603/volatile-mediated-interactions-between-cabbage-plants-in-the-field-and-the-impact-of-ozone-pollution
#7
Patricia Sarai Giron-Calva, Tao Li, James D Blande
Plants constitutively release volatile organic compounds (VOCs), but qualitatively and quantitatively alter their emission of VOCs in response to biotic and abiotic stresses. The blend of VOCs emitted reflects the physiological status of the plant. Plants may be exposed to the VOC blend emitted by their near neighbors and gain information that allows them to adjust their own defenses. These plant-plant interactions may potentially be exploited to protect crops from pests, but they can be disturbed by abiotic factors making the process sensitive to environmental perturbation...
March 29, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28315996/olfactory-preferences-of-the-parasitic-nematode-howardula-aoronymphium-and-its-insect-host-drosophila-falleni
#8
James A Cevallos, Ryo P Okubo, Steve J Perlman, Elissa A Hallem
Many parasitic nematodes have an environmental infective stage that searches for hosts. Olfaction plays an important role in this process, with nematodes navigating their environment using host-emitted and environmental olfactory cues. The interactions between parasitic nematodes and their hosts are also influenced by the olfactory behaviors of the host, since host olfactory preferences drive behaviors that may facilitate or impede parasitic infection. However, how olfaction shapes parasite-host interactions is poorly understood...
March 18, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28303527/chemical-ecology-of-cave-dwelling-millipedes-defensive-secretions-of-the-typhloiulini-diplopoda-julida-julidae
#9
Slobodan E Makarov, Michaela Bodner, Doris Reineke, Ljubodrag V Vujisić, Marina M Todosijević, Dragan Ž Antić, Boyan Vagalinski, Luka R Lučić, Bojan M Mitić, Plamen Mitov, Boban D Anđelković, Sofija Pavković Lucić, Vlatka Vajs, Vladimir T Tomić, Günther Raspotnig
Cave animals live under highly constant ecological conditions and in permanent darkness, and many evolutionary adaptations of cave-dwellers have been triggered by their specific environment. A similar "cave effect" leading to pronounced chemical interactions under such conditions may be assumed, but the chemoecology of troglobionts is mostly unknown. We investigated the defensive chemistry of a largely cave-dwelling julid group, the controversial tribe "Typhloiulini", and we included some cave-dwelling and some endogean representatives...
March 16, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28303526/a-herbivore-tag-and-trace-system-reveals-contact-and-density-dependent-repellence-of-a-root-toxin
#10
Zoe Bont, Carla Arce, Meret Huber, Wei Huang, Adrien Mestrot, Craig J Sturrock, Matthias Erb
Foraging behavior of root feeding organisms strongly affects plant-environment-interactions and ecosystem processes. However, the impact of plant chemistry on root herbivore movement in the soil is poorly understood. Here, we apply a simple technique to trace the movement of soil-dwelling insects in their habitats without disturbing or restricting their interactions with host plants. We tagged the root feeding larvae of Melolontha melolontha with a copper ring and repeatedly located their position in relation to their preferred host plant, Taraxacum officinale, using a commercial metal detector...
March 16, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28299588/chemical-cues-which-include-amino-acids-mediate-species-specific-feeding-behavior-in-invasive-filter-feeding-bigheaded-carps
#11
Aaron W Claus, Peter W Sorensen
This study tested whether and how dissolved chemicals might assist food recognition in two filter-feeding fishes, the silver (Hypophthalmichthys molitrix) and the bighead carp (H. nobilis). These species evolved in Asia, are now invasive in the Mississippi River, and feed voraciously on microparticles including plankton. The food habits and biology of these carps are broadly similar to many filter-feeding fish, none of whose chemical ecology has been examined. We conducted five experiments. First, we demonstrated that buccal-pharngeal pumping (BPP), a behavior in which fish pump water into their buccal cavities, is responsible for sampling food: BPP activity in both silver and bighead carps was low and increased nearly 25-fold after exposure to a filtrate of a planktonic food mixture (P < 0...
March 15, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28289966/variable-alkaloid-defenses-in-the-dendrobatid-poison-frog-oophaga-pumilio-are-perceived-as-differences-in-palatability-to-arthropods
#12
Sarah K Bolton, Kelsie Dickerson, Ralph A Saporito
Conspicuously colored dendrobatid frogs sequester alkaloid defenses from dietary arthropods, resulting in considerable alkaloid variation among populations; however, little is known about how variation is perceived as a defense against predators. Previous studies have found variable alkaloids in the dendrobatid Oophaga pumilio to be associated with differences in toxicity to laboratory mice, suggesting variable defenses are important. Arthropods are natural predators that use chemoreception to detect prey, including frogs, and may therefore perceive variation in alkaloid profiles as differences in palatability...
March 13, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28280959/volatile-mediated-within-plant-signaling-in-hybrid-aspen-required-for-systemic-responses
#13
Tao Li, James D Blande
Plant volatiles play crucial roles in signaling between plants and their associated community members, but their role in within-plant signaling remains largely unexplored, particularly under field conditions. Using a system comprising the hybrid aspen (Populus tremula x tremuloides) and the specialized herbivorous leaf beetle (Phratora laticollis) and, combining field, greenhouse and laboratory experiments, we examined whether local damage triggered systemic responses in undamaged branches that lack vascular connection to the damaged branches, and to what extent this was caused by airborne volatile signals versus internal signals...
March 9, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28271344/electrospun-micro-nanofibers-as-controlled-release-systems-for-pheromones-of-bactrocera-oleae-and-prays-oleae
#14
Stefanos Kikionis, Efstathia Ioannou, Maria Konstantopoulou, Vassilios Roussis
New systems for the controlled release of 1,7-dioxaspiro[5.5]undecane and (Z)-7-tetradecenal, the sex pheromones of olive fruit fly, Bactrocera oleae, and olive moth, Prays oleae, respectively, were developed utilizing electrospun micro/nanofiber matrices from inexpensive, biodegradable polymers, namely polycaprolactone, cellulose acetate and polyhydroxybutyrate. The incorporation of the pheromones in 5, 10 and 20% w/w in the electrospinning polymer blends allowed for the production of fiber mats with variable loading levels and release rates, ensuring however in all cases the release of pheromones for more than 16 weeks...
March 7, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28258318/toxicity-of-monoterpene-structure-diversity-and-concentration-to-mountain-pine-beetles-dendroctonus-ponderosae-beetle-traits-matter-more
#15
Mary L Reid, Jagdeep K Sekhon, Lanielle M LaFramboise
A high diversity of plant defenses may be a response to herbivore diversity or may be collectively more toxic than single compounds, either of which may be important for understanding insect-plant associations. Monoterpenes in conifers are particularly diverse. We tested the fumigant toxicity of four monoterpenes, alone and in combination, to mountain pine beetles, Dendroctonus ponderosae, in the context of the beetles' individual body traits. Chemical structures of tested monoterpene hydrocarbons had modest effects on beetle survival, mass loss, water content and fat content, with (R)-(+)-limonene tending to be more toxic than (-)-α-pinene, (-)-β-pinene, and (+)-3-carene...
March 3, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28258317/exploring-the-effects-of-plant-odors-from-tree-species-of-differing-host-quality-on-the-response-of-lymantria-dispar%C3%A2-males-to-female-sex-pheromones
#16
Andrea Clavijo McCormick, Jonathan Heyer, James W Sims, Mark C Mescher, Consuelo M De Moraes
A widely accepted hypothesis for host-plant selection in herbivorous insects is that ovipositing females select host-plants that maximize the survival and performance of their offspring. However, numerous studies indicate that this is not always the case for polyphagous species. Lymantria dispar is a highly polyphagous forest defoliator and has flightless females in some subspecies, resulting in a limited capacity to make host-choices. Males of other Lepidopteran species utilize a combination of sexual pheromones and plant volatiles in their mating choices and exhibit preferences among plant species...
March 3, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28255942/intestinal-lymphatic-transport-an-overlooked-pathway-for-understanding-absorption-of-plant-secondary-compounds-in-vertebrate-herbivores
#17
Kevin D Kohl, M Denise Dearing
Herbivores employ numerous strategies to reduce their exposure to toxic plant secondary chemicals (PSCs). However, the physiological mechanisms of PSC absorption have not been extensively explored. In particular, the absorption of PSCs via intestinal lymphatic absorption has been largely overlooked in herbivores, even though this pathway is well recognized for pharmaceutical uptake. Here, we investigated for the first time whether PSCs might be absorbed by lymphatic transport. We fed woodrats (Neotoma albigula) diets with increasing concentrations of terpene-rich juniper (Juniperus monosperma) either with or without a compound that blocks intestinal lymphatic absorption (Pluronic L-81)...
March 2, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28251439/plant-volatiles-increase-sex-pheromone-attraction-of-holotrichia-parallela-coleoptera-scarabaeoidea
#18
Qian Ju, Xiao-Qiang Guo, Xiao Li, Xiao-Jing Jiang, Xiang-Guo Jiang, Wan-Li Ni, Ming-Jing Qu
Holotrichia parallela (Coleoptera: Scarabaeoidea) is a notorious pest of many crops. To improve the effectiveness of its female-produced sex pheromone (L-isoleucine methyl ester:(R)-(-)-linalool = 6:1), 14 plant volatiles, including dodecanoic acid, dodecanal, farnesol, α-farnesene, (Z)-3-hexen-1-ol, (E)-2-hexen-1-ol, (Z)-3-hexenyl acetate, (E)-2-hexenyl acetate, (R)-(+)-limonene, α-phellandrene, α-pinene, ocimene, methyl benzoate, and benzaldehyde, were individually evaluated using electroantennography and olfactometer assays...
March 2, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28251438/letter-from-the-editor-a-daunting-task
#19
LETTER
Gary W Felton
No abstract text is available yet for this article.
March 2, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28247151/structure-activity-relationships-of-alkylpyrazine-analogs-and-fear-associated-behaviors-in-mice
#20
Kazumi Osada, Sadaharu Miyazono, Makoto Kashiwayanagi
Our previous studies identified alkyl pyrazine analogs in wolf urine that act as novel kairomones and induce a series of fear-associated behaviors in mice. A mixture of these alkyl pyrazines also effectively suppressed the approach of deer to a feeding area, and animals that did approach the marked area exhibited fear-associated behaviors. To investigate structure-activity relationships of alkyl pyrazines, four fear-associated behaviors - freezing, locomotion activity, odor investigation, and avoidance - were measured in experiments on female C57BL/6 J mice...
February 28, 2017: Journal of Chemical Ecology
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