Data from: Short-term cold acclimation influences <i>Rhyzopertha dominica</i> mobility in different temperatures

Stored product insects threaten global food security, yet their ecology remains largely understudied. The lesser grain borer, Rhyzopertha dominica, is among the most damaging pests of stored grain. Because locomotion underpins resource and mate finding, impaired movement can reduce colonization success. While cold storage is an effective management strategy, insects may counter these measures through adaptive responses, such as acclimating to low temperatures. Changes in seasonal patterns can increase opportunities for acclimation, and misapplied treatments may reduce the efficacy of temperature-based pest control. To examine behavioral effects of acclimation, we quantified walking of R. dominica across two strains (lab and wild), sexes, and acclimation treatments (18 °C for 24 h vs no acclimation) at 10, 20, and 30 °C. Distances moved and proportions of high and low mobility events were recorded for one hour. Movement increased with temperature in all treatments. At 10 °C, acclimated R. dominica moved farther, had fewer immobile events, and more high mobility events than those in the non-acclimated treatment, whereas at 20 and 30 °C, the patterns reversed. Females and lab strain R. dominica moved more than male and wild strain counterparts, with females showing higher activity at 20 and 30 °C and lab strain only at 30 °C. These results indicate that short-term cold acclimation enhances locomotion at low temperatures while suppressing movement at higher temperatures, with effects further modulated by sex and strain. Furthermore, the findings emphasize the need for careful application and monitoring of cold storage protocols to maintain effective grain protection. Columns are: minutes = time during the trial; distance = distance moved in cm; mobile = number of highly mobile events (default setting threshold: ≥ 1 cm/s); immobile = number of immobile events (default setting threshold: ≤ 0.33 cm/s); velocity = speed of movement cm/s; trial = replicate; temperature = temperature where insects were placed; sex = male or female; strain = lab or wild (more recently collected); acclimated = yes (18°C for 24 h) or no.