We Are What We Eat: A Stoichiometric and Ecometabolomic Study of Caterpillars Feeding on Two Pine Subspecies of Pinus sylvestris

Rivas-Ubach, Albert; Peñuelas, Josep; Hódar, José; Oravec, Michal; Paša-Tolić, Ljiljana; Urban, Otmar; Sardans, Jordi

doi:10.3390/ijms20010059

We Are What We Eat: A Stoichiometric and Ecometabolomic Study of Caterpillars Feeding on Two Pine Subspecies of Pinus sylvestris

Journal Article · Mon Dec 24 00:00:00 EST 2018 · International Journal of Molecular Sciences (Online)

DOI:https://doi.org/10.3390/ijms20010059· OSTI ID:1506991

Rivas-Ubach, Albert ^[1]; Peñuelas, Josep ^[2]; Hódar, José ^[3]; Oravec, Michal ^[4]; Paša-Tolić, Ljiljana ^[5]; Urban, Otmar ^[4]; Sardans, Jordi ^[2]

Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Center for Ecological and Forestry Applications, Catalonia (Spain)
Center for Ecological and Forestry Applications, Catalonia (Spain); Global Ecology Unit CREAF-CEAB-CSIC-UAB, Catalonia (Spain)
Univ. of Granada (Spain)
Czech Academy of Sciences, Brno (Czech Republic)
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Many studies have addressed several plant-insect interaction topics at nutritional, molecular, physiological, and evolutionary levels. However, it is still unknown how flexible the metabolism and the nutritional content of specialist insect herbivores feeding on different closely related plants can be. We performed elemental, stoichiometric, and metabolomics analyses on leaves of two coexisting Pinus sylvestris subspecies and on their main insect herbivore; the caterpillar of the processionary moth (Thaumetopoea pityocampa). Caterpillars feeding on different pine subspecies had distinct overall metabolome structure, accounting for over 10% of the total variability. Although plants and insects have very divergent metabolomes, caterpillars showed certain resemblance to their plant-host metabolome. In addition, few plant-related secondary metabolites were found accumulated in caterpillar tissues which could potentially be used for self-defense. Caterpillars feeding on N and P richer needles had lower N and P tissue concentration and higher C:N and C:P ratios, suggesting that nutrient transfer is not necessarily linear through trophic levels and other plant-metabolic factors could be interfering. This exploratory study showed that little chemical differences between plant food sources can impact the overall metabolome of specialist insect herbivores. Significant nutritional shifts in herbivore tissues could lead to larger changes of the trophic web structure.

View Accepted Manuscript (DOE)

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1506991

Report Number(s):: PNNL-SA--140210

Journal Information:: International Journal of Molecular Sciences (Online), Journal Name: International Journal of Molecular Sciences (Online) Journal Issue: 1 Vol. 20; ISSN IJMCFK; ISSN 1422-0067

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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59 BASIC BIOLOGICAL SCIENCES
Plant-Insect
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Processionary moth
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secondary metabolites
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We Are What We Eat: A Stoichiometric and Ecometabolomic Study of Caterpillars Feeding on Two Pine Subspecies of Pinus sylvestris

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