Comparison of photosynthetic damage from arthropod herbivory and pathogen infection in understory hardwood saplings Export

@article{citeulike:885695, abstract = {Abstract\ \ Arthropods and pathogens damage leaves in natural ecosystems and may reduce photosynthesis at some distance away from directly injured tissue. We quantified the indirect effects of naturally occurring biotic damage on leaf-level photosystem II operating efficiency (ΦPSII) of 11 understory hardwood tree species using chlorophyll fluorescence and thermal imaging. Maps of fluorescence parameters and leaf temperature were stacked for each leaf and analyzed using a multivariate method adapted from the field of quantitative remote sensing. Two tree species, Quercus velutina and Cercis canadensis, grew in plots exposed to ambient and elevated atmospheric CO2 and were infected with Phyllosticta fungus, providing a limited opportunity to examine the potential interaction of this element of global change and biotic damage on photosynthesis. Areas surrounding damage had depressed ΦPSII and increased down-regulation of PSII, and there was no evidence of compensation in the remaining tissue. The depression of ΦPSII caused by fungal infections and galls extended \>2.5 times further from the visible damage and was ∼40\% more depressed than chewing damage. Areas of depressed ΦPSII around fungal infections on oaks growing in elevated CO2 were more than 5\ times larger than those grown in ambient conditions, suggesting that this element of global change may influence the indirect effects of biotic damage on photosynthesis. For a single Q. velutina sapling, the area of reduced ΦPSII was equal to the total area directly damaged by insects and fungi. Thus, estimates based only on the direct effect of biotic agents may greatly underestimate their actual impact on photosynthesis.}, author = {Aldea, Mihai and Hamilton, Jason and Resti, Joseph and Zangerl, Arthur and Berenbaum, May and Frank, Thomas and Delucia, Evan}, citeulike-article-id = {885695}, citeulike-linkout-0 = {http://dx.doi.org/10.1007/s00442-006-0444-x}, citeulike-linkout-1 = {http://www.ingentaconnect.com/content/klu/442/2006/00000149/00000002/00000444}, citeulike-linkout-2 = {http://www.springerlink.com/content/d721862415124118}, day = {1}, doi = {10.1007/s00442-006-0444-x}, issn = {0029-8549}, journal = {Oecologia}, keywords = {arthropod, damage, herbivory, photosynthesis, sapling}, month = {August}, number = {2}, pages = {221--232}, posted-at = {2009-07-16 19:08:36}, priority = {2}, publisher = {Springer}, title = {Comparison of photosynthetic damage from arthropod herbivory and pathogen infection in understory hardwood saplings}, url = {http://dx.doi.org/10.1007/s00442-006-0444-x}, volume = {149}, year = {2006} }

TY - JOUR ID - citeulike:885695 L3 - citeulike-article-id:885695 N2 - Abstract  Arthropods and pathogens damage leaves in natural ecosystems and may reduce photosynthesis at some distance away from directly injured tissue. We quantified the indirect effects of naturally occurring biotic damage on leaf-level photosystem II operating efficiency (ΦPSII) of 11 understory hardwood tree species using chlorophyll fluorescence and thermal imaging. Maps of fluorescence parameters and leaf temperature were stacked for each leaf and analyzed using a multivariate method adapted from the field of quantitative remote sensing. Two tree species, Quercus velutina and Cercis canadensis, grew in plots exposed to ambient and elevated atmospheric CO2 and were infected with Phyllosticta fungus, providing a limited opportunity to examine the potential interaction of this element of global change and biotic damage on photosynthesis. Areas surrounding damage had depressed ΦPSII and increased down-regulation of PSII, and there was no evidence of compensation in the remaining tissue. The depression of ΦPSII caused by fungal infections and galls extended >2.5 times further from the visible damage and was ∼40% more depressed than chewing damage. Areas of depressed ΦPSII around fungal infections on oaks growing in elevated CO2 were more than 5 times larger than those grown in ambient conditions, suggesting that this element of global change may influence the indirect effects of biotic damage on photosynthesis. For a single Q. velutina sapling, the area of reduced ΦPSII was equal to the total area directly damaged by insects and fungi. Thus, estimates based only on the direct effect of biotic agents may greatly underestimate their actual impact on photosynthesis. IS - 2 JF - Oecologia SN - 0029-8549 EP - 232 TI - Comparison of photosynthetic damage from arthropod herbivory and pathogen infection in understory hardwood saplings PB - Springer VL - 149 SP - 221 KW - arthropod KW - damage KW - herbivory KW - photosynthesis KW - sapling AU - Aldea, Mihai AU - Hamilton, Jason AU - Resti, Joseph AU - Zangerl, Arthur AU - Berenbaum, May AU - Frank, Thomas AU - Delucia, Evan PY - 2006/08/01/ UR - http://dx.doi.org/10.1007/s00442-006-0444-x ER -