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https://www.readbyqxmd.com/read/28224051/high-richness-of-insect-herbivory-from-the-early-miocene-hindon-maar-crater-otago-new-zealand
#1
Anna Lena Möller, Uwe Kaulfuss, Daphne E Lee, Torsten Wappler
Plants and insects are key components of terrestrial ecosystems and insect herbivory is the most important type of interaction in these ecosystems. This study presents the first analysis of associations between plants and insects for the early Miocene Hindon Maar fossil lagerstätte, Otago, New Zealand. A total of 584 fossil angiosperm leaves representing 24 morphotypes were examined to determine the presence or absence of insect damage types. Of these leaves, 73% show signs of insect damage; they comprise 821 occurrences of damage from 87 damage types representing all eight functional feeding groups...
2017: PeerJ
https://www.readbyqxmd.com/read/28205578/insect-herbivory-choristoneura-fumiferana-tortricidea-underlies-tree-population-structure-picea-glauca-pinaceae
#2
Geneviève J Parent, Isabelle Giguère, Gaby Germanos, Mebarek Lamara, Éric Bauce, John J MacKay
Variation in insect herbivory can lead to population structure in plant hosts as indicated by defence traits. In annual herbaceous, defence traits may vary between geographic areas but evidence of such patterns is lacking for long-lived species. This may result from the variety of selection pressures from herbivores, long distance gene flow, genome properties, and lack of research. We investigated the antagonistic interaction between white spruce (Picea glauca) and spruce budworm (SBW, Choristoneura fumiferana) the most devastating forest insect of eastern North America in common garden experiments...
February 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28195388/survey-of-conspecific-herbivore-induced-volatiles-from-apple-as-possible-attractants-for-pandemis-pyrusana-lepidoptera-tortricidae
#3
V Giacomuzzi, J Mattheis, E Basoalto, S Angeli, A L Knight
BACKGROUND: Studies were conducted to identify volatiles released by apple foliage untreated or sprayed with a yeast and from untreated and sprayed foliage with actively-feeding larvae of Pandemis pyrusana Kearfott. Field studies then evaluated various combinations of these volatiles when paired with acetic acid as possible adult attractants. RESULTS: The most abundant volatiles released following herbivore-feeding were four green leaf volatiles (GLVs) and acetic acid...
February 13, 2017: Pest Management Science
https://www.readbyqxmd.com/read/28178961/sequential-above-and-belowground-herbivory-modifies-plant-responses-depending-on-herbivore-identity
#4
Dinesh Kafle, Anne Hänel, Tobias Lortzing, Anke Steppuhn, Susanne Wurst
BACKGROUND: Herbivore-induced changes in plant traits can cause indirect interactions between spatially and/or temporally separated herbivores that share the same host plant. Feeding modes of the herbivores is one of the major factors that influence the outcome of such interactions. Here, we tested whether the effects of transient aboveground herbivory for seven days by herbivores of different feeding guilds on tomato plants (Solanum lycopersicum) alters their interaction with spatially as well as temporally separated belowground herbivores...
February 8, 2017: BMC Ecology
https://www.readbyqxmd.com/read/28175992/early-plant-defence-against-insect-attack-involvement-of-reactive-oxygen-species-in-plant-responses-to-insect-egg-deposition
#5
Norbert Bittner, Ute Trauer-Kizilelma, Monika Hilker
Pinus sylvestris responds to insect egg deposition by ROS accumulation linked with reduced activity of the ROS scavenger catalase. Egg mortality in needles with hypersensitive response (HR)-like symptoms is enhanced. Aggressive reactive oxygen species (ROS) play an important role in plant defence against biotic stressors, including herbivorous insects. Plants may even generate ROS in response to insect eggs, thus effectively fighting against future larval herbivory. However, so far nothing is known on how ROS-mediated plant defence against insect eggs is enzymatically regulated...
February 7, 2017: Planta
https://www.readbyqxmd.com/read/28163703/microbial-interactions-in-the-phyllosphere-increase-plant-performance-under-herbivore-biotic-stress
#6
Muhammad Saleem, Nicole Meckes, Zahida H Pervaiz, Milton B Traw
The phyllosphere supports a tremendous diversity of microbes and other organisms. However, little is known about the colonization and survival of pathogenic and beneficial bacteria alone or together in the phyllosphere across the whole plant life-cycle under herbivory, which hinders our ability to understand the role of phyllosphere bacteria on plant performance. We addressed these questions in experiments using four genetically and biogeographically diverse accessions of Arabidopsis thaliana, three ecologically important bacterial strains (Pseudomonas syringae DC3000, Xanthomonas campestris, both pathogens, and Bacillus cereus, plant beneficial) under common garden conditions that included fungus gnats (Bradysia spp...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28155236/dual-herbivore-attack-and-herbivore-density-affect-metabolic-profiles-of-brassica-nigra-leaves
#7
Camille Ponzio, Stefano Papazian, Benedicte R Albrectsen, Marcel Dicke, Rieta Gols
Plant responses to dual herbivore attack are increasingly studied, but effects on the metabolome have largely been restricted to volatile metabolites and defense-related non-volatile metabolites. However, plants subjected to stress, such as herbivory, undergo major changes in both primary and secondary metabolism. Using a naturally occurring system, we investigated metabolome-wide effects of single or dual herbivory on Brassica nigra plants by Brevicoryne brassicae aphids and Pieris brassicae caterpillars, while also considering the effect of aphid density...
February 2, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28148835/long-term-memory-of-relative-reward-values
#8
Francesca Soldati, Oliver H P Burman, Elizabeth A John, Thomas W Pike, Anna Wilkinson
Long-term memory can be adaptive as it allows animals to retain information that is crucial for survival, such as the appearance and location of key resources. This is generally examined by comparing choices of stimuli that have value to the animal with those that do not; however, in nature choices are rarely so clear cut. Animals are able to assess the relative value of a resource via direct comparison, but it remains unclear whether they are able to retain this information for a biologically meaningful amount of time...
February 2017: Biology Letters
https://www.readbyqxmd.com/read/28142282/trade-offs-between-plant-growth-and-defense-against-insect-herbivory-an-emerging-mechanistic-synthesis
#9
Tobias Züst, Anurag A Agrawal
Costs of defense are central to our understanding of interactions between organisms and their environment, and defensive phenotypes of plants have long been considered to be constrained by trade-offs that reflect the allocation of limiting resources. Recent advances in uncovering signal transduction networks have revealed that defense trade-offs are often the result of regulatory "decisions" by the plant, enabling it to fine-tune its phenotype in response to diverse environmental challenges. We place these results in the context of classic studies in ecology and evolutionary biology, and propose a unifying framework for growth-defense trade-offs as a means to study the plant's allocation of limiting resources...
January 30, 2017: Annual Review of Plant Biology
https://www.readbyqxmd.com/read/28132104/testing-genotypic-variation-of-an-invasive-plant-species-in-response-to-soil-disturbance-and-herbivory
#10
Shannon L J Bayliss, Casey P terHorst, Jennifer A Lau
Herbivores, competitors, and predators can inhibit biological invasions ("biotic resistance" sensu Elton 1959), while disturbance typically promotes biological invasions. Although biotic resistance and disturbance are often considered separately in the invasion literature, these two forces may be linked. One mechanism by which disturbance may facilitate biological invasions is by decreasing the effectiveness of biotic resistance. The effects of both disturbance and biotic resistance may vary across invading genotypes, and genetic variation in the invasive propagule pool may increase the likelihood that some genotypes can overcome biotic resistance or take greater advantage of disturbance...
January 28, 2017: Oecologia
https://www.readbyqxmd.com/read/28119293/nutrient-foraging-strategies-are-associated-with-productivity-and-population-growth-in-forest-shrubs
#11
Joshua S Caplan, Bram W G Stone, Cara A Faillace, Jonathan J Lafond, Joni M Baumgarten, Thomas J Mozdzer, John Dighton, Scott J Meiners, Jason C Grabosky, Joan G Ehrenfeld
BACKGROUND AND AIMS: Temperate deciduous forest understoreys are experiencing widespread changes in community composition, concurrent with increases in rates of nitrogen supply. These shifts in plant abundance may be driven by interspecific differences in nutrient foraging (i.e. conservative vs. acquisitive strategies) and, thus, adaptation to contemporary nutrient loading conditions. This study sought to determine if interspecific differences in nutrient foraging could help explain patterns of shrub success and decline in eastern North American forests...
January 23, 2017: Annals of Botany
https://www.readbyqxmd.com/read/28116524/determinants-of-woody-encroachment-and-cover-in-african-savannas
#12
REVIEW
Aisling P Devine, Robbie A McDonald, Tristan Quaife, Ilya M D Maclean
Savanna ecosystems are an integral part of the African landscape and sustain the livelihoods of millions of people. Woody encroachment in savannas is a widespread phenomenon but its causes are widely debated. We review the extensive literature on woody encroachment to help improve understanding of the possible causes and to highlight where and how future scientific efforts to fully understand these causes should be focused. Rainfall is the most important determinant of maximum woody cover across Africa, but fire and herbivory interact to reduce woody cover below the maximum at many locations...
January 23, 2017: Oecologia
https://www.readbyqxmd.com/read/28112395/herbivore-exclusion-promotes-a-more-stochastic-plant-community-assembly-in-a-natural-grassland
#13
Juan Alberti, Elisabeth S Bakker, Roel van Klink, Han Olff, Christian Smit
Both bottom-up (e.g. nutrients) and top-down (e.g. herbivory) forces structure plant communities, but it remains unclear how they affect the relative importance of stochastic and deterministic processes in plant community assembly. Moreover, different sized herbivores have been shown to have contrasting effects on community structure and function, but their effects on the processes governing community assembly (i.e. how they generate the impacts on structure) remain largely unknown. We evaluated the influence of bottom-up and top-down forces on the relative importance of deterministic and stochastic processes during plant community assembly...
January 23, 2017: Ecology
https://www.readbyqxmd.com/read/28112169/prehistorical-and-historical-declines-in-caribbean-coral-reef-accretion-rates-driven-by-loss-of-parrotfish
#14
Katie L Cramer, Aaron O'Dea, Tara R Clark, Jian-Xin Zhao, Richard D Norris
Caribbean coral reefs have transformed into algal-dominated habitats over recent decades, but the mechanisms of change are unresolved due to a lack of quantitative ecological data before large-scale human impacts. To understand the role of reduced herbivory in recent coral declines, we produce a high-resolution 3,000 year record of reef accretion rate and herbivore (parrotfish and urchin) abundance from the analysis of sediments and fish, coral and urchin subfossils within cores from Caribbean Panama. At each site, declines in accretion rates and parrotfish abundance were initiated in the prehistorical or historical period...
January 23, 2017: Nature Communications
https://www.readbyqxmd.com/read/28111900/responses-of-insect-herbivores-and-herbivory-to-habitat-fragmentation-a-hierarchical-meta-analysis
#15
REVIEW
María Rosa Rossetti, Teja Tscharntke, Ramiro Aguilar, Péter Batáry
Loss and fragmentation of natural habitats can lead to alterations of plant-animal interactions and ecosystems functioning. Insect herbivory, an important antagonistic interaction is expected to be influenced by habitat fragmentation through direct negative effects on herbivore community richness and indirect positive effects due to losses of natural enemies. Plant community changes with habitat fragmentation added to the indirect effects but with little predictable impact. Here, we evaluated habitat fragmentation effects on both herbivory and herbivore diversity, using novel hierarchical meta-analyses...
February 2017: Ecology Letters
https://www.readbyqxmd.com/read/28102915/transgenerational-effects-alter-plant-defense-and-resistance-in-nature
#16
Jack Colicchio
Trichomes, or leaf hairs, are epidermal extensions that take a variety of forms and perform many functions in plants, including herbivore defense. In this study, I document genetically determined variation, within-generation plasticity, and a direct role of trichomes in herbivore defense for Mimulus guttatus. After establishing the relationship between trichomes and herbivory, I test for transgenerational effects of wounding on trichome density and herbivore resistance. Patterns of inter-annual variation in herbivore density and the high cost of plant defense makes plant-herbivore interactions a system in which transgenerational phenotypic plasticity (TPP) is apt to evolve...
January 19, 2017: Journal of Evolutionary Biology
https://www.readbyqxmd.com/read/28099483/reading-the-leaves-palm-leaf-traits-and-herbivory-along-the-microclimatic-gradient-of-forest-layers
#17
Stephanie Stiegel, Martin H Entling, Jasmin Mantilla-Contreras
Microclimate in different positions on a host plant has strong direct effects on herbivores. But little is known about indirect effects due to changes of leaf traits. We hypothesized that herbivory increases from upper canopy to lower canopy and understory due to a combination of direct and indirect pathways. Furthermore, we hypothesized that herbivory in the understory differs between tree species in accordance with their leaf traits. We investigated herbivory by leaf chewing insects along the vertical gradient of mixed deciduous forest stands on the broad-leaved tree species Fagus sylvatica L...
2017: PloS One
https://www.readbyqxmd.com/read/28095490/costs-and-tradeoffs-of-resistance-and-tolerance-to-belowground-herbivory-in-potato
#18
Etzel Garrido, Maria Fernanda Díaz, Hugo Bernal, Carlos Eduardo Ñustez, Jennifer Thaler, Georg Jander, Katja Poveda
The success of sustainable crop production depends on our ability to select or create varieties that can allocate resources to both growth and defence. However, breeding efforts have emphasized increases in yields but have partially neglected defence traits against pests. Estimating the costs of multiple defences against tuber herbivores and the tradeoffs among them, as well as understanding the relationship between yield and multiple defences is still unknown but relevant to both basic and applied ecology...
2017: PloS One
https://www.readbyqxmd.com/read/28094274/folivory-elicits-a-strong-defense-reaction-in-catharanthus-roseus-metabolomic-and-transcriptomic-analyses-reveal-distinct-local-and-systemic-responses
#19
Thomas Dugé de Bernonville, Inês Carqueijeiro, Arnaud Lanoue, Florent Lafontaine, Paloma Sánchez Bel, Franziska Liesecke, Karine Musset, Audrey Oudin, Gaëlle Glévarec, Olivier Pichon, Sébastien Besseau, Marc Clastre, Benoit St-Pierre, Victor Flors, Stéphane Maury, Elisabeth Huguet, Sarah E O'Connor, Vincent Courdavault
Plants deploy distinct secondary metabolisms to cope with environment pressure and to face bio-aggressors notably through the production of biologically active alkaloids. This metabolism-type is particularly elaborated in Catharanthus roseus that synthesizes more than a hundred different monoterpene indole alkaloids (MIAs). While the characterization of their biosynthetic pathway now reaches completion, still little is known about the role of MIAs during biotic attacks. As a consequence, we developed a new plant/herbivore interaction system by challenging C...
January 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28092131/finish-line-plant-insect-interactions-mediated-by-insect-feeding-mode-and-plant-interference-a-case-study-of-brassica-interactions-with-diamondback-moth-and-turnip-aphid
#20
Mahmoud Soufbaf, Yaghoub Fathipour, Jeffrey A Harvey, Cang Hui
There are gaps in our understanding of plant responses under different insect phytophagy modes and their subsequent effects on the insect herbivores' performance at late season. Here we compared different types of insect feeding by an aphid, Lipaphis erysimi, and a lepidopteran, Plutella xylostella, and how this affected defensive metabolites in leaves of two Brassica species when plants gain maturity. Thiocyanate concentrations after P. xylostella and L. erysimi feeding activities were the same. Total phenolics was higher after the phloem feeder feeding than the folivore activity...
January 16, 2017: Insect Science
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