Morphological and biochemical responses of a neotropical pest insect to low temperatures.

As traditionally cold areas become warmer due to climate change, temperature could no longer be a barrier to the establishment of non-native insects. This is particularly relevant for pest insects from warm and tropical areas, mainly those with some tolerance to moderately low temperatures, which could expand their range into these new locations. From this perspective, in this work we studied the morphological and biochemical responses of the Neotropical pest Paysandisia archon to low temperatures, as part of a possible strategy to colonize new areas. To that end, wild larvae were exposed for 7 days to either low (1 and 5 °C) or ambient (23 °C) temperatures. We then quantified the inner and outer morphological changes, by X-Ray Computer Tomography and Digital Holographic Microscopy, as well as the accumulation of metabolites acting as potential endogenous cryoprotectants, by Spectrophotometry. We found that Paysandisia archon developed a cold-induced response based on different aspects. On the one hand, morphological changes occurred with a significant reduction both in fluids susceptible to freezing and fat body, together with the thickening, hardening and increased roughness of the integument. On the other hand, we found an increase in the hemolymph concentration of cryoprotective substances such as glucose (6-fold) and glycerol (2-fold), while trehalose remained unchanged. Surprisingly, this species did not show any evidence of cold-induced response unless the environmental temperature was remarkably low (1 °C). These results could be useful to improve models predicting the possible spread of such a pest, which should incorporate parameters related to its resistance to low temperatures.

Comparative randomized trial addressing childhood emotional problems: Computerized vs. traditional transdiagnostic Super Skills program.

BACKGROUND: Super Skills for Life is a structured intervention rooted in cognitive-behavioral therapy and a transdiagnostic approach, aimed at preventing childhood emotional problems. Over the past decade, it has demonstrated positive outcomes in various formats and countries. This study evaluated the comparative effectiveness of two individual modalities: the computerized and the traditional version enriched with multimedia content, through a comparative randomized effectiveness trial. METHOD: 109 children (55.24 % female) aged 8-12 years participated, randomly assigned to either the traditional (n = 54) or computerized (n = 51) groups. Pre- and post-intervention assessments involved emotional problem measures completed by children and parents. RESULTS: Both groups exhibited significant reductions in all outcomes according to parent reports, including depression, anxiety, and anxiety-related life interference. Children's self-reports indicated improvements across all general measures. Generalized Estimating Equations indicated marginally better improvements in the traditional group. LIMITATIONS: Limitations included the absence of follow-up assessment, variability in participant regions across Spain, and input from other informants like teachers. CONCLUSIONS: This study pioneers the examination of short-term effects of the program in both a fully computerized format supervised by a specialized therapist and an enriched traditional individual format, and the promising results suggest their potential for indicated prevention of childhood emotional problems.