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Chemical ecology of tannins and other phenolics: we need a change in approach
A clear but detailed view of the chemical ecology of tannins and the methodology used to study them is given, and a new method to estimate the oxidative activity of all types of tANNins and other phenolics that might cause oxidative stress to herbivores is introduced.
Insect Herbivores Drive Real-Time Ecological and Evolutionary Change in Plant Populations
- A. Agrawal, A. Hastings, Marc T. J. Johnson, J. Maron, J. Salminen
- Environmental ScienceScience
- 5 October 2012
This work tested the prediction that Insect herbivores are hypothesized to be major factors affecting the ecology and evolution of plants by suppressing insects in replicated field populations of a native plant, Oenothera biennis, which reduced seed predation, altered interspecific competitive dynamics, and resulted in rapid evolutionary divergence.
Seasonal Variation in the Content of Hydrolyzable Tannins, Flavonoid Glycosides, and Proanthocyanidins in Oak Leaves
- J. Salminen, T. Roslin, M. Karonen, J. Sinkkonen, K. Pihlaja, P. Pulkkinen
- Chemistry, MedicineJournal of Chemical Ecology
- 1 September 2004
A large variation in temporal trends among compounds, and a generally weak correlation between the concentration of any individual compound and the total concentration of phenolics, as quantified by the Folin–Ciocalteau method, leads us to caution against the uncritical use of summary quantifications of composite phenolic fractions in ecological studies.
Ellagitannins have Greater Oxidative Activities than Condensed Tannins and Galloyl Glucoses at High pH: Potential Impact on Caterpillars
- R. Barbehenn, Christopher P. Jones, A. Hagerman, M. Karonen, J. Salminen
- ChemistryJournal of Chemical Ecology
- 4 October 2006
The results suggest that ellagitannin-rich plants have active oxidative defenses against herbivores, such as caterpillars, whereas the opposite may hold true for plants that contain predominantly condensed tannins or high-molecular-weight gallotannins.
Phylogenetic Trends in Phenolic Metabolism of Milkweeds (Asclepias): Evidence for Escalation
- A. Agrawal, J. Salminen, M. Fishbein
- BiologyEvolution; international journal of organic…
- 1 March 2009
A rigorous test of the defense-escalation hypothesis and a novel phylogenetic approach to understanding the long-term persistence of physiological constraints on secondary metabolism are presented.
Herbivory enhances positive effects of plant genotypic diversity.
Genetic selection analyses showed that the selective value of ecologically important traits depended on plant diversity and exposure to deer, demonstrating that community complexity can promote fitness through multiple ecologically and evolutionarily important feedbacks.
Comparative analysis of leaf trichome structure and composition of epicuticular flavonoids in Finnish birch species.
- Elena Valkama, J. Salminen, J. Koricheva, K. Pihlaja
- Environmental ScienceAnnals of botany
- 1 May 2003
The structure, density and distribution of leaf trichomes and the composition of epicuticular flavonoids represent good taxonomic markers for Finnish birch species.
Hydrolyzable tannins as "quantitative defenses": limited impact against Lymantria dispar caterpillars on hybrid poplar.
Benefits of Condensed Tannins in Forage Legumes Fed to Ruminants: Importance of Structure, Concentration, and Diet Composition
This review covers recent results from multidisciplinary research on sainfoin (Onobrychis Mill.) and provides an overview of current developments with several other tanniniferous forages.
Heritability, covariation and natural selection on 24 traits of common evening primrose (Oenothera biennis) from a field experiment
- M. T. Johnson, A. Agrawal, J. Maron, J. Salminen
- Environmental ScienceJournal of evolutionary biology
- 1 June 2009
The combination of genetic covariances and directional selection acting on multiple traits suggests that adaptive evolution of particular traits is constrained, and that correlated evolution of groups of traits will occur, which is expected to drive the evolution of increased herbivore susceptibility.