TY - JOUR
T1 - Induced plant responses to multiple damagers
T2 - Differential effects on an herbivore and its parasitoid
AU - Rodriguez-Saona, Cesar
AU - Chalmers, Jennifer A.
AU - Raj, Sherosha
AU - Thaler, Jennifer S.
N1 - Funding Information:
Acknowledgements Thanks to John Ruberson (University of Georgia) and Gay McCain (USDA-ARS Biological Control and Mass Rearing Unit, MS, USA) for providing us with C. margini-ventris, Lisa Plane for assistance in maintaining the colonies and conducting experiments, and Chris Darling for his assistance in measuring tibial lengths of C. marginiventris. The manuscript was improved by comments by A. Agrawal, M. Vos, P. Barbosa, C. Muis, D. Viswanathan, N. Kurashige, M. Lajeunesse, and M. Johnson. This research was funded by a Premier’s Research Excellence Award and a NSERC Discovery Grant to J. Thaler.
PY - 2005/8
Y1 - 2005/8
N2 - Herbivore-induced plants responses can affect the preference and performance of herbivores and their natural enemies. These responses may vary depending on the identity and number of herbivore species feeding on the plant so that when herbivores from different guilds feed on plants, the interactions between plants, herbivores, and natural enemies may be disrupted. Tomato plants were damaged either by the caterpillar Spodoptera exigua, or the aphid Macrosiphum euphorbiae, or damaged by both herbivores, or undamaged controls. We measured the preference and performance of S. exigua and its parasitoid Cotesia marginiventris, and activity of proteinase inhibitors (PI) as an indicator of induced resistance. Compared to undamaged plants, caterpillar damage reduced the number of eggs laid by S. exigua adults, reduced growth, consumption, and survival of larval S. exigua and C. marginiventris, and increased activity of PIs 43%; but did not increase attraction of C. marginiventris. While pupal mass of S. exigua was not affected, the pupal mass of C. marginiventris decreased on caterpillar-damaged plants compared to controls. In contrast, plants damaged by aphids were preferred for oviposition by S. exigua, and had increased larval consumption and survival, compared to controls. Aphid feeding did not affect the preference or performance of C. marginiventris, or PI activity, compared to controls. While oviposition was deterred on caterpillar-damaged plants, plants damaged by both herbivores received the same amount of oviposition as controls. The attraction of C. marginiventris to plants damaged by caterpillars and aphids was increased compared to controls. However, plants damaged by both herbivores had similar PI activity, larval growth and survival of S. exigua and C. marginiventris, as plants singly damaged by caterpillars. Overall, the preference component for both the herbivore and parasitoid was more strongly affected by damage due to multiple herbivores than the performance component.
AB - Herbivore-induced plants responses can affect the preference and performance of herbivores and their natural enemies. These responses may vary depending on the identity and number of herbivore species feeding on the plant so that when herbivores from different guilds feed on plants, the interactions between plants, herbivores, and natural enemies may be disrupted. Tomato plants were damaged either by the caterpillar Spodoptera exigua, or the aphid Macrosiphum euphorbiae, or damaged by both herbivores, or undamaged controls. We measured the preference and performance of S. exigua and its parasitoid Cotesia marginiventris, and activity of proteinase inhibitors (PI) as an indicator of induced resistance. Compared to undamaged plants, caterpillar damage reduced the number of eggs laid by S. exigua adults, reduced growth, consumption, and survival of larval S. exigua and C. marginiventris, and increased activity of PIs 43%; but did not increase attraction of C. marginiventris. While pupal mass of S. exigua was not affected, the pupal mass of C. marginiventris decreased on caterpillar-damaged plants compared to controls. In contrast, plants damaged by aphids were preferred for oviposition by S. exigua, and had increased larval consumption and survival, compared to controls. Aphid feeding did not affect the preference or performance of C. marginiventris, or PI activity, compared to controls. While oviposition was deterred on caterpillar-damaged plants, plants damaged by both herbivores received the same amount of oviposition as controls. The attraction of C. marginiventris to plants damaged by caterpillars and aphids was increased compared to controls. However, plants damaged by both herbivores had similar PI activity, larval growth and survival of S. exigua and C. marginiventris, as plants singly damaged by caterpillars. Overall, the preference component for both the herbivore and parasitoid was more strongly affected by damage due to multiple herbivores than the performance component.
KW - Performance
KW - Preference
KW - Proteinase inhibitors
KW - Specificity of plant responses
KW - Tritrophic interactions
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U2 - 10.1007/s00442-005-0006-7
DO - 10.1007/s00442-005-0006-7
M3 - Article
C2 - 15791425
AN - SCOPUS:18444387098
SN - 0029-8549
VL - 143
SP - 566
EP - 577
JO - Oecologia
JF - Oecologia
IS - 4
ER -