Multiple plant traits shape the genetic basis of herbivore community assembly
Matthew A. Barbour,Mariano A. Rodriguez-Cabal,Mariano A. Rodriguez-Cabal,Elizabeth T. Wu,Riitta Julkunen-Tiitto,Carol Ritland,Allyson E. Miscampbell,Erik S. Jules,Gregory M. Crutsinger +8 more
TLDR
Examining the influence of both genetic and phenotypic variation in a dominant host-plant species, Salix hookeriana, on its associated arthropod herbivore community in a common garden experiment supports that the genetic basis of herbivor community assembly occurs through a suite of plant traits for different herbivores species and feeding guilds.Abstract:
Summary 1. Community genetics research has posited a genetic basis to the assembly of ecological communities. For arthropod herbivores in particular, there is strong support that genetic variation in host plants is a key factor shaping their diversity and composition. However, the specific plant phenotypes underlying herbivore responses remain poorly explored for most systems. 2. We address this knowledge gap by examining the influence of both genetic and phenotypic variation in a dominant host-plant species, Salix hookeriana, on its associated arthropod herbivore community in a common garden experiment. Specifically, we surveyed herbivore responses among five different arthropod feeding guilds to 26 distinct S. hookeriana genotypes. Moreover, we quantified the heritability of a suite of plant traits that determine leaf quality (e.g. phenolic compounds, trichomes, specific leaf area, C : N) and whole-plant architecture, to identify which traits best accounted for herbivore community responses to S. hookeriana genotype. 3. We found that total herbivore abundance and community composition differed considerably among S. hookeriana genotypes, with strong and independent responses of several species and feeding guilds driving these patterns. We also found that leaf phenolic chemistry displayed extensive heritable variation, whereas leaf physiology and plant architecture tended to be less heritable. Of these traits, herbivore responses were primarily associated with leaf phenolics and plant architecture; however, different herbivore species and feeding guilds were associated with different sets of traits. Despite our thorough trait survey, plant genotype remained a significant predictor of herbivore responses in most trait association analyses, suggesting that unmeasured host-plant characteristics and/or interspecific interactions were also contributing factors. 4. Taken together, our results support that the genetic basis of herbivore community assembly occurs through a suite of plant traits for different herbivore species and feeding guilds. Still, identifying these phenotypic mechanisms requires measuring a broad range of plant traits and likely further consideration of how these traits affect interspecific interactions.read more
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Intraspecific phytochemical variation shapes community and population structure for specialist caterpillars
Andrea E. Glassmire,Christopher S. Jeffrey,Matthew L. Forister,Thomas L. Parchman,Chris C. Nice,Joshua P. Jahner,Joseph S. Wilson,Thomas R. Walla,Thomas R. Walla,Lora A. Richards,Angela M. Smilanich,Michael D. Leonard,Colin R. Morrison,Wilmer Simbana,Luis A. Salagaje,Craig D. Dodson,Jim S. Miller,Eric J. Tepe,Santiago Villamarín-Cortez,Lee A. Dyer,Lee A. Dyer +20 more
TL;DR: Investigation of secondary metabolite variation among subpopulations of a single plant species, Piper kelleyi, using high‐performance liquid chromatography (HPLC), found substantive concentration differences among three major secondary metabolites, and these differences in chemistry predicted caterpillar and parasitoid community structure among host plant populations.
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A community genetics perspective: opportunities for the coming decade
TL;DR: This perspective makes a series of key points about the general patterns that have emerged and calls attention to gaps in understanding to be addressed in the coming years.
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What genomic data can reveal about eco-evolutionary dynamics.
Seth M. Rudman,Matthew A. Barbour,Katalin Csilléry,Phillip Gienapp,Frédéric Guillaume,Nelson G. Hairston,Andrew P. Hendry,Jesse R. Lasky,Marina Rafajlović,Katja Räsänen,Paul S. Schmidt,Ole Seehausen,Ole Seehausen,Nina Overgaard Therkildsen,Martin M. Turcotte,Martin M. Turcotte,Jonathan M. Levine +16 more
TL;DR: It is argued that genomic data can be integrated into the study of eco-evolutionary dynamics in ways that deepen the authors' understanding of the interplay between ecology and evolution.
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Genetic specificity of a plant–insect food web: Implications for linking genetic variation to network complexity
Matthew A. Barbour,Miguel A. Fortuna,Jordi Bascompte,Joshua R. Nicholson,Riitta Julkunen-Tiitto,Erik S. Jules,Gregory M. Crutsinger +6 more
TL;DR: Estimation of how genetic variation within a host plant directly and indirectly affects its associated insect food web results in distinct trophic interactions occurring on each host-plant genotype, which indicates that intraspecific genetic variation can play a key role in structuring ecological networks, which may in turn affect network persistence.
Journal ArticleDOI
Forest diversity effects on insect herbivores: do leaf traits matter?
Evalyne W. Muiruri,Evalyne W. Muiruri,Sandra Barantal,Glenn R. Iason,Juha-Pekka Salminen,Estefania Perez‐Fernandez,Julia Koricheva +6 more
TL;DR: The results show that leaf trait variation across the diversity gradient might promote associational resistance, but these patterns are driven by an increase in the relative abundance of heterospecifics rather than by tree species richness per se.
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