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Journal of Chemical Ecology

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https://www.readbyqxmd.com/read/28526946/evolutionary-ecology-of-multitrophic-interactions-between-plants-insect-herbivores-and-entomopathogens
#1
Ikkei Shikano
Plants play an important role in the interactions between insect herbivores and their pathogens. Since the seminal review by Cory and Hoover (2006) on plant-mediated effects on insect-pathogen interactions, considerable progress has been made in understanding the complexity of these tritrophic interactions. Increasing interest in the areas of nutritional and ecological immunology over the last decade have revealed that plant primary and secondary metabolites can influence the outcomes of insect-pathogen interactions by altering insect immune functioning and physical barriers to pathogen entry...
May 19, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28500569/comparison-of-the-chemical-compositions-of-the-cuticle-and-dufour-s-gland-of-two-solitary-bee-species-from-laboratory-and-field-conditions
#2
Theresa L Pitts-Singer, Marcia M Hagen, Bryan R Helm, Steven Highland, James S Buckner, William P Kemp
Species-specific biochemistry, morphology, and function of the Dufour's gland have been investigated for social bees and some non-social bee families. Most of the solitary bees previously examined are ground-nesting bees that use Dufour's gland secretions to line brood chambers. This study examines the chemistry of the cuticle and Dufour's gland of cavity-nesting Megachile rotundata and Osmia lignaria, which are species managed for crop pollination. Glandular and cuticular lipid compositions were characterized and compared to each other and according to the nesting experience of adult females...
May 12, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28500568/female-sex-pheromone-of-the-cone-moth-dioryctria-mendacella-investigation-of-synergism-between-type-i-and-type-ii-pheromone-components
#3
David R Hall, Dudley Farman, Juan C Domínguez, Juan A Pajares
Polyunsaturated hydrocarbons (Type II pheromone components) have been reported to be synergists for unsaturated acetates, alcohols or aldehydes (Type I components) in the sex pheromones of several species of Lepidoptera. However, there is some debate over whether the active components are the hydrocarbons themselves or more volatile degradation products. Extracts of pheromone glands of adult females of the cone moth, Dioryctria mendacella (Lepidoptera: Pyralidae), contain (Z,E)-9,11-tetradecadienyl acetate (ZE9,11-14:Ac) and at least ten times as much (Z,Z,Z,Z,Z)-3,6,9,12,15-pentacosapentaene (ZZZZZ3,6,9,12,15-25:H)...
May 12, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28478546/the-extended-community-level-effects-of-genetic-variation-in-foliar-wax-chemistry-in-the-forest-tree-eucalyptus-globulus
#4
Benjamin Gosney, Julianne O'Reilly-Wapstra, Lynne Forster, Carmen Whiteley, Brad Potts
Genetic variation in foundation trees can influence dependent communities, but little is known about the mechanisms driving these extended genetic effects. We studied the potential chemical drivers of genetic variation in the dependent foliar community of the focal tree Eucalyptus globulus. We focus on the role of cuticular waxes and compare the effects to that of the terpenes, a well-studied group of secondary compounds known to be bioactive in eucalypts. The canopy community was quantified based on the abundance of thirty-nine distinctive arthropod and fungal symptoms on foliar samples collected from canopies of 246 progeny from 13 E...
May 6, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28477139/caterpillar-induced-plant-volatiles-attract-adult-tortricidae
#5
D M Suckling, A M El-Sayed
Binary and ternary combinations of volatile organic compounds identified earlier from caterpillar-infested apple foliage caught more than one thousand individuals of both sexes of several adult tortricid leafroller species in several days of trials conducted in apple orchards in southern British Columbia. A series of combinations with phenylacetonitrile, benzyl alcohol, and/or 2-phenylethanol and acetic acid enabled substantial catches of both sexes of eye-spotted budmoth, Spilonota ocellana, oblique-banded leafroller, Choristoneura rosaceana and three-lined leafroller, Pandemis limitata...
May 6, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28466378/a-native-parasitic-plant-systemically-induces-resistance-in-jack-pine-to-a-fungal-symbiont-of-invasive-mountain-pine-beetle
#6
Jennifer G Klutsch, Ahmed Najar, Patrick Sherwood, Pierluigi Bonello, Nadir Erbilgin
Conifer trees resist pest and pathogen attacks by complex defense responses involving different classes of defense compounds. However, it is unknown whether prior infection by biotrophic pathogens can lead to subsequent resistance to necrotrophic pathogens in conifers. We used the infection of jack pine, Pinus banksiana, by a common biotrophic pathogen dwarf mistletoe, Arceuthobium americanum, to investigate induced resistance to a necrotrophic fungus, Grosmannia clavigera, associated with the mountain pine beetle, Dendroctonus ponderosae...
May 2, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28455797/the-fungus-raffaelea-lauricola-modifies-behavior-of-its-symbiont-and-vector-the-redbay-ambrosia-beetle-xyleborus-glabratus-by-altering-host-plant-volatile-production
#7
Xavier Martini, Marc A Hughes, Nabil Killiny, Justin George, Stephen L Lapointe, Jason A Smith, Lukasz L Stelinski
The redbay ambrosia beetle Xyleborus glabratus is the vector of the symbiotic fungus, Raffaelea lauricola that causes laurel wilt, a highly lethal disease to members of the Lauraceae family. Pioneer X. glabratus beetles infect live trees with R. lauricola, and only when tree health starts declining more X. glabratus are attracted to the infected tree. Until now this sequence of events was not well understood. In this study, we investigated the temporal patterns of host volatiles and phytohormone production and vector attraction in relation to laurel wilt symptomology...
April 28, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28455796/effect-of-brood-pheromone-on-survival-and-nutrient-intake-of-african-honey-bees-apis-mellifera-scutellata-under-controlled-conditions
#8
Fabien J Démares, Abdullahi A Yusuf, Susan W Nicolson, Christian W W Pirk
The influence of pheromones on insect physiology and behavior has been thoroughly reported for numerous aspects, such as attraction, gland development, aggregation, mate and kin recognition. Brood pheromone (BP) is released by honey bee larvae to indicate their protein requirements to the colony. Although BP is known to modulate pollen and protein consumption, which in turn can affect physiological and morphological parameters, such as hypopharyngeal gland (HPG) development and ovarian activation, few studies have focused on the effect of BP on nutritional balance...
April 28, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28405915/does-aphid-infestation-interfere-with-indirect-plant-defense-against-lepidopteran-caterpillars-in-wild-cabbage
#9
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
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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/28299588/chemical-cues-which-include-amino-acids-mediate-species-specific-feeding-behavior-in-invasive-filter-feeding-bigheaded-carps
#17
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/28280959/volatile-mediated-within-plant-signaling-in-hybrid-aspen-required-for-systemic-responses
#18
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/28258318/toxicity-of-monoterpene-structure-diversity-and-concentration-to-mountain-pine-beetles-dendroctonus-ponderosae-beetle-traits-matter-more
#19
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/28251438/letter-from-the-editor-a-daunting-task
#20
LETTER
Gary W Felton
No abstract text is available yet for this article.
March 2, 2017: Journal of Chemical Ecology
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