• Corpus ID: 18474226

Natural selection on common milkweed (Asclepias syriaca) by a community of specialized insect herbivores

@article{Agrawal2005NaturalSO,
  title={Natural selection on common milkweed (Asclepias syriaca) by a community of specialized insect herbivores},
  author={Anurag A. Agrawal},
  journal={Evolutionary Ecology Research},
  year={2005},
  volume={7},
  pages={651-667}
}
  • A. Agrawal
  • Published 2005
  • Biology
  • Evolutionary Ecology Research
Hypothesis: Genetic variation in plant defence structures a community of herbivores and ultimately mediates co-evolution. Organisms: Common milkweed (Asclepias syriaca) and five natural insect herbivores (seed bug, leaf mining fly, monarch caterpillar and two beetles). Methods: Quantitative genetic field experiment over 2 years, genetic selection analyses, and measurement of five defensive traits (cardenolides, latex, trichomes, leaf toughness and nitrogen content). Results: All plant traits… 

Figures and Tables from this paper

Attenuation of the Jasmonate Burst, Plant Defensive Traits, and Resistance to Specialist Monarch Caterpillars on Shaded Common Milkweed (Asclepias syriaca)
TLDR
A mechanistic basis for the attenuation of induced plant resistance in low resource environments is provided, with light-mediated impacts on jasmonate-induction being stronger for latex exudation than cardenolides.
Evolution of Specialization: A Phylogenetic Study of Host Range in the Red Milkweed Beetle (Tetraopes tetraophthalmus)
TLDR
It is concluded that phylogenetic distance is an integrated measure of phenotypic and ecological attributes of Asclepias species, especially defensive cardenolides, which can be used to explain specialization and constraints on host shifts over evolutionary time.
Growth–defense tradeoffs for two major anti‐herbivore traits of the common milkweed Asclepias syriaca
TLDR
A novel method for quantifying plant growth using the common milkweed Asclepias syriaca and repeated non-destructive size measurements to experimentally test for costs of defensive traits and found negative genetic correlations between cardenolides and growth at both nutrient levels.
Induced Responses to Herbivory and Jasmonate in Three Milkweed Species
TLDR
It is confirmed that latex and cardenolides are major defenses in milkweeds, effective against a specialist herbivore.
Plant Defense by Latex: Ecological Genetics of Inducibility in the Milkweeds and a General Review of Mechanisms, Evolution, and Implications for Agriculture
TLDR
Most species exhibit a genetic and inducible basis for latex, although genetic variation in inducibility is not pervasive, and jasmonic acid is a key regulator of latex exudation, laticifer morphology, and defensive metabolites within latex.
Explaining differential herbivory in sun and shade: the case of Aristotelia chilensis saplings
TLDR
The multiple regression analysis showed that leaf thickness was the only trait significantly associated with herbivory and, together with results of insect abundance, renders unlikely that the differential Herbivory in A. chilensis was due to greater herbvory pressure in open habitats.
Mycorrhizae Alter Toxin Sequestration and Performance of Two Specialist Herbivores
TLDR
Inoculation with AMF increased foliar cardenolide concentrations consistently among milkweed species, but altered aboveground biomasses and foliar phosphorous concentrations in a plant species-specific fashion, suggesting the availability of AMF in soil has the potential to influence both top-down and bottom up forces that operate on herbivores.
Genetic variation in expression of defense phenotype may mediate evolutionary adaptation of Asclepias syriaca to elevated CO2
TLDR
Differential effects of CO2 on plant defense expression, rather than direct effects on relative fitness, may alter A. syriaca adaptation to changing climate.
Insect herbivores drive the loss of unique chemical defense in willows
TLDR
The study shows that the balance between costs and benefits of defensive traits is not necessarily in favor of novel compounds and illustrates a process, which may lead to the reduction in a defensive trait.
Specificity of Herbivore-Induced Hormonal Signaling and Defensive Traits in Five Closely Related Milkweeds (Asclepias spp.)
Despite the recognition that phytohormonal signaling mediates induced responses to herbivory, we still have little understanding of how such signaling varies among closely related species and may
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 62 REFERENCES
COMMUNITY‐WIDE IMPACTS OF HERBIVORE‐INDUCED PLANT RESPONSES IN MILKWEED (ASCLEPIAS SYRIACA)
TLDR
Investigation of the seasonal development of the herbivore fauna on common milkweed shows that damage by an early-season stem-feeding weevil reduced growth of monarch larvae and leaf beetle larvae, suggesting that plant quality is reduced by weevil damage.
Structure of the Encounter between Goldenrod (Solidago Altissima) and Its Diverse Insect Fauna
TLDR
Investigating the population responses of 17 insect species to the genotypic variation exhibited by clones of goldenrods, Solidago altissima, found no negative genetic correlations among suites and few among pairs of species, which suggests that trade-offs between the plant's resistance traits are relatively unimportant.
Variable Impact of Diverse Insect Herbivores on Dimorphic Datura wrightii
TLDR
The fitness of plants with glandular trichomes never exceeded that of plants of each trichome type despite variation in both the composition of the herbivore community and the total level of damage inflicted by herbivores over three years of study.
Diffuse Selection on Resistance to Deer Herbivory in the Ivyleaf Morning Glory, Ipomoea hederacea
TLDR
The results indicate that the composition of the natural enemy community can alter both the pattern of selection and the likely response to selection of resistance traits.
Specificity of induced plant responses to specialist herbivores of the common milkweed Asclepias syriaca
TLDR
These specialist herbivores exhibit both specificity of elicitation in plant responses and specificity of effects in response to prior damage, suggesting they should be less predictable than generalists in their responses to induced plant resistance traits.
Compensatory Feeding in Danaus plexippus (Lepidoptera: Nymphalidae) in Response to Variation in Host Plant Quality
TLDR
Results suggest that monarch larvae compensate for lower plant quality by consuming more, and if increased consumption is costly because of increased exposure to natural enemies or increased expenditure on consuming and processing food, low nitrogen host plants may result in decreased fitness, despite monarchs’ ability to compensate.
Ecological play in the coevolutionary theatre: genetic and environmental determinants of attack by a specialist weevil on milkweed
TLDR
Although attack of plants by weevils strongly increases the probability of stem mortality, thicker stems experience lower mortality, thus counteracting the selective impact of weevil-induced plant mortality.
Plant Defense and Density Dependence in the Population Growth of Herbivores
  • A. Agrawal
  • Biology, Medicine
    The American Naturalist
  • 2004
TLDR
Variation in plant secondary compounds, trichomes, leaf carbon and nitrogen concentrations, and seed mass of the milkweed species predicted the Rmax of aphid populations, while specific leaf weight, carbon concentration, latex, water content, and trichome density were significant predictors of the strength of density dependence.
GENETICS OF RESISTANCE OF SALIX SERICEA TO A DIVERSE COMMUNITY OF HERBIVORES
  • B. M. Roche, R. Fritz
  • Biology, Medicine
    Evolution; international journal of organic evolution
  • 1997
TLDR
It appears that there is the potential for evolution of resistance to the two herbivores for which the genetic and phenotypic correlation structure varied from year to year in this three‐year study.
INDUCED RESPONSES TO HERBIVORY IN WILD RADISH: EFFECTS ON SEVERAL HERBIVORES AND PLANT FITNESS
TLDR
Induced responses in annual wild radish plants, Raphanus raphanistrum and R. sativus, included increased density and total number of setose trichomes on newly formed leaves of previously damaged plants compared to undamaged controls and did not affect the growth of specialist Pieris rapae larvae.
...
1
2
3
4
5
...