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Journal of Chemical Ecology

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https://www.readbyqxmd.com/read/28315996/olfactory-preferences-of-the-parasitic-nematode-howardula-aoronymphium-and-its-insect-host-drosophila-falleni
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
#10
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
#11
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
#12
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
#13
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
https://www.readbyqxmd.com/read/28247150/alarm-pheromone-composition-and-behavioral-activity-in-fungus-growing-ants
#14
Victoria C Norman, Thomas Butterfield, Falko Drijfhout, Kiah Tasman, William O H Hughes
Chemical communication is a dominant method of communication throughout the animal kingdom and can be especially important in group-living animals in which communicating threats, either from predation or other dangers, can have large impacts on group survival. Social insects, in particular, have evolved a number of pheromonal compounds specifically to signal alarm. There is predicted to be little selection for interspecific variation in alarm cues because individuals may benefit from recognizing interspecific as well as conspecific cues and, consequently, alarm cues are not normally thought to be used for species or nestmate recognition...
February 28, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28190150/effects-of-elevated-co2-on-the-swainsonine-chemotypes-of-astragalus-lentiginosus-and-astragalus-mollissimus
#15
Daniel Cook, Dale R Gardner, James A Pfister, Clinton A Stonecipher, Joseph G Robins, Jack A Morgan
Rapid changes in the Earth's atmosphere and climate associated with human activity can have significant impacts on agriculture including livestock production. CO2 concentration has risen from the industrial revolution to the current time, and is expected to continue to rise. Climatic changes alter physiological processes, growth, and development in numerous plant species, potentially changing concentrations of plant secondary compounds. These physiological changes may influence plant population density, growth, fitness, and toxin concentrations and thus influence the risk of toxic plants to grazing livestock...
February 11, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28130740/effect-of-male-house-mouse-pheromone-components-on-behavioral-responses-of-mice-in-laboratory-and-field-experiments
#16
Antonia E Musso, Regine Gries, Huimin Zhai, Stephen Takács, Gerhard Gries
Urine of male house mice, Mus musculus, is known to have primer pheromone effects on the reproductive physiology of female mice. Urine-mediated releaser pheromone effects that trigger certain behavioral responses are much less understood, and no field studies have investigated whether urine deposits by male or female mice, or synthetic mouse pheromone, increase trap captures of mice. In field experiments, we baited traps with bedding soiled with urine and feces of caged female or male mice, and recorded captures of mice in these and in control traps containing clean bedding...
January 27, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28116564/letter-from-the-editor
#17
John T Romeo
No abstract text is available yet for this article.
January 23, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28108840/differences-in-monoterpene-biosynthesis-and-accumulation-in-pistacia-palaestina-leaves-and-aphid-induced-galls
#18
Karin Rand, Einat Bar, Matan Ben Ari, Rachel Davidovich-Rikanati, Natalia Dudareva, Moshe Inbar, Efraim Lewinsohn
Certain insect species can induce gall formation on numerous plants species. Although the mechanism of gall development is largely unknown, it is clear that insects manipulate their hosts' anatomy, physiology, and chemistry for their own benefit. It is well known that insect-induced galls often contain vast amounts of plant defensive compounds as compared to non-colonized tissues, but it is not clear if defensive compounds can be produced in situ in the galled tissues. To answer this question, we analyzed terpene accumulation patterns and possible independent biosynthetic potential of galls induced by the aphid Baizongia pistaciae L...
January 20, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28097605/elevated-carbon-dioxide-concentration-reduces-alarm-signaling-in-aphids
#19
Antoine Boullis, Bérénice Fassotte, Landry Sarles, Georges Lognay, Stéphanie Heuskin, Maryse Vanderplanck, Stefan Bartram, Eric Haubruge, Frédéric Francis, François J Verheggen
Insects often rely on olfaction to communicate with conspecifics. While the chemical language of insects has been deciphered in recent decades, few studies have assessed how changes in atmospheric greenhouse gas concentrations might impact pheromonal communication in insects. Here, we hypothesize that changes in the concentration of atmospheric carbon dioxide affect the whole dynamics of alarm signaling in aphids, including: (1) the production of the active compound (E)-β-farnesene (Eβf), (2) emission behavior when under attack, (3) perception by the olfactory apparatus, and (4) the escape response...
January 17, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28091822/does-the-growth-differentiation-balance-hypothesis-explain-allocation-to-secondary-metabolites-in-combretum-apiculatum-an-african-savanna-woody-species
#20
Dawood Hattas, Peter F Scogings, Riitta Julkunen-Tiitto
The growth differentiation balance hypothesis (GDBH) provides a framework that predicts a trade-off between costs of secondary metabolites (SMs) relative to the demand for photosynthate by growth. However, this hypothesis was developed using empirical evidence from plant species in northern boreal and temperate systems, leaving its applicability to species under different abiotic and biotic conditions questionable and generalizations problematic. The objective of this study was to investigate whether the GDBH explains allocation to SMs in the deciduous African savanna woody species C...
January 14, 2017: Journal of Chemical Ecology
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