Tracing nutrient sources to lipid production in insects using stable isotope (δ13C, δ2H) tracers: Implications for nutritional physiology of migratory species.

Using stable isotope measurements of insect tissues to determine origin and migratory patterns is well established. However, isotopically determining nutritional origins of lipids, the primary fuel of migration, has not been as thoroughly researched. We explored isotopic links between diet and stored lipids in laboratory raised True armyworm moths (Mythimna unipuncta) using δ13C and δ2H measurements. Pupae were randomly separated into four groups (n=20) and fed isotopically distinct nectar, each consisting of a combination of high δ13C (C4 sugar), or low δ13C (C3 sugar) carbohydrate, with high δ2H (deuterium spiked), or low δ2H (tap) water. After 6 days of feeding, lipids were extracted for isotopic analysis using CF-IRMS. The carbohydrate contributed to approximately 80% of the δ13C and water contributed to approximately 13% of the δ2H in lipids. Lipids from C4 fed moths had higher δ13C values compared to C3 fed moths (-29.1 vs -16.6 ‰, P2H values compared to moths given tap water (-187.3 vs -254.6 ‰, P13C which can be used to provide continental isoscapes for tracking sources of stored lipids

Resilient Strategies and Sustainability in Agri-Food Supply Chains in the Face of High-Risk Events

[EN] Agri-food supply chains (AFSCs) are very vulnerable to high risks such as pandemics, causing economic and social impacts mainly on the most vulnerable population. Thus, it is a priority to implement resilient strategies that enable AFSCs to resist, respond and adapt to new market challenges. At the same time, implementing resilient strategies impact on the social, economic and environmental dimensions of sustainability. The objective of this paper is twofold: analyze resilient strategies on AFSCs in the literature and identify how these resilient strategies applied in the face of high risks affect the achievement of sustainability dimensions. The analysis of the articles is carried out in three points: consequences faced by agri-food supply chains due to high risks, strategies applicable in AFSCs, and relationship between resilient strategies and the achievement of sustainability dimensions.Authors of this publication acknowledge the contribution of the Project 691249, RUC-APS "Enhancing and implementing Knowledge based ICT solutions within high Risk and Uncertain Conditions for Agriculture Production Systems" (www.ruc-aps.eu), funded by the European Union under their funding scheme H2020-MSCA-RISE-2015.Zavala-Alcívar, A.; Verdecho Sáez, MJ.; Alfaro Saiz, JJ. (2020). Resilient Strategies and Sustainability in Agri-Food Supply Chains in the Face of High-Risk Events. IFIP Advances in Information and Communication Technology. 598:560-570. https://doi.org/10.1007/978-3-030-62412-5_46S560570598Gray, R.: Agriculture, transportation, and the COVID-19 crisis. Can. J. Agric. 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Disaster relief operations: past, present and future

The aim of the preface is to introduce the scope of this special issue (SI). We explain our editorial approach and summarise our findings based on articles included in this SI. Finally, we outline future research questions which stemmed out of the discussions of this SI

Lipid Gain in Mythimna unipuncta Moths Raised on Sucrose and Glucose Based Comparative Diets

Enriching the isotopic composition of diet is a tool that is used very readily to determine different patterns of nutrient sourcing and availability. This isotopic enrichment can be done on some sugars. In the wild, many lepidoptera feed on nectar primarily comprised of sucrose, yet isotopically enriched glucose is more widely available due to ease of enrichment and associated price. This experiment tests if true armyworm (Mythimna unipuncta) gain mass similarly when raised on diets with varying sucrose and glucose concentrations