Abstract
Because predation risk typically alters how prey forage for food, interactions between predation risk and food availability are commonly found. Less is known about how host plant quality and predation risk interact to affect prey behaviour and physiology. Using the caterpillar, Manduca sexta, and its predator, Podisus maculiventris, the effects of predation risk and host plant quality on caterpillar feeding, growth, assimilation efficiency, and resting metabolic rate were tested. Overall, caterpillars on low-resistance tomato plants (jasmonate-insensitive) gained 14% more mass than caterpillars on high-resistance plants (wild-type tomato). On low-resistance plants, the presence of predators caused caterpillars to eat 32% less, but they gained the same mass as unthreatened caterpillars (i.e. a 19% increase in assimilation efficiency). In addition, caterpillars showed a 17% increase in resting metabolic rate in the presence of predators. On high-resistance plants, predation risk caused a decrease in feeding, but did not alter assimilation efficiency or resting metabolic rate. The reduction in physiological responses to predation risk on high- versus low-resistance plants demonstrates a tradeoff between the ability to respond to predation risk and the ability to grow, especially on well-defended plants.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 210-216 |
| Number of pages | 7 |
| Journal | Ecological Entomology |
| Volume | 39 |
| Issue number | 2 |
| DOIs | |
| State | Published - 2014 |
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Keywords
- Host plant quality
- Jasmonate pathway
- Manduca sexta
- Non-consumptive effects
- Podisus maculiventris
- Solanum lycopersicum
- Trait-mediated effects
ASJC Scopus subject areas
- Insect Science
- Ecology
Cite this
Effects of predation risk and plant resistance on Manduca sexta caterpillar feeding behaviour and physiology. / Thaler, Jennifer S.; Contreras, Heidy; Davidowitz, Goggy.
In: Ecological Entomology, Vol. 39, No. 2, 2014, p. 210-216.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effects of predation risk and plant resistance on Manduca sexta caterpillar feeding behaviour and physiology
AU - Thaler, Jennifer S.
AU - Contreras, Heidy
AU - Davidowitz, Goggy
PY - 2014
Y1 - 2014
N2 - Because predation risk typically alters how prey forage for food, interactions between predation risk and food availability are commonly found. Less is known about how host plant quality and predation risk interact to affect prey behaviour and physiology. Using the caterpillar, Manduca sexta, and its predator, Podisus maculiventris, the effects of predation risk and host plant quality on caterpillar feeding, growth, assimilation efficiency, and resting metabolic rate were tested. Overall, caterpillars on low-resistance tomato plants (jasmonate-insensitive) gained 14% more mass than caterpillars on high-resistance plants (wild-type tomato). On low-resistance plants, the presence of predators caused caterpillars to eat 32% less, but they gained the same mass as unthreatened caterpillars (i.e. a 19% increase in assimilation efficiency). In addition, caterpillars showed a 17% increase in resting metabolic rate in the presence of predators. On high-resistance plants, predation risk caused a decrease in feeding, but did not alter assimilation efficiency or resting metabolic rate. The reduction in physiological responses to predation risk on high- versus low-resistance plants demonstrates a tradeoff between the ability to respond to predation risk and the ability to grow, especially on well-defended plants.
AB - Because predation risk typically alters how prey forage for food, interactions between predation risk and food availability are commonly found. Less is known about how host plant quality and predation risk interact to affect prey behaviour and physiology. Using the caterpillar, Manduca sexta, and its predator, Podisus maculiventris, the effects of predation risk and host plant quality on caterpillar feeding, growth, assimilation efficiency, and resting metabolic rate were tested. Overall, caterpillars on low-resistance tomato plants (jasmonate-insensitive) gained 14% more mass than caterpillars on high-resistance plants (wild-type tomato). On low-resistance plants, the presence of predators caused caterpillars to eat 32% less, but they gained the same mass as unthreatened caterpillars (i.e. a 19% increase in assimilation efficiency). In addition, caterpillars showed a 17% increase in resting metabolic rate in the presence of predators. On high-resistance plants, predation risk caused a decrease in feeding, but did not alter assimilation efficiency or resting metabolic rate. The reduction in physiological responses to predation risk on high- versus low-resistance plants demonstrates a tradeoff between the ability to respond to predation risk and the ability to grow, especially on well-defended plants.
KW - Host plant quality
KW - Jasmonate pathway
KW - Manduca sexta
KW - Non-consumptive effects
KW - Podisus maculiventris
KW - Solanum lycopersicum
KW - Trait-mediated effects
UR - http://www.scopus.com/inward/record.url?scp=84895734462&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84895734462&partnerID=8YFLogxK
U2 - 10.1111/een.12086
DO - 10.1111/een.12086
M3 - Article
AN - SCOPUS:84895734462
VL - 39
SP - 210
EP - 216
JO - Ecological Entomology
JF - Ecological Entomology
SN - 0307-6946
IS - 2
ER -