Effects of short-term heat stress on the thermal tolerance of western corn rootworm (Coleoptera: Chrysomelidae)

Journal of Insect Science, Journal Year: 2025, Volume and Issue: 25(2)

Published: March 1, 2025

Abstract Insect responses to warming temperatures are determined partly by their physiology, which is influenced genetic factors and plasticity induced past temperature exposure. The effect that prior high exposure has on insect thermal tolerance complex depends the degree of heat stress experienced; may allow for individuals tolerate higher through hardening or reduce an individual’s capacity withstand accumulated stress. In this study, we assessed how short exposures a laboratory colony’s geographical origin affected critical maximum (CTmax) western corn rootworm (Diabrotica virgifera LeConte), economically important pest. Despite wide latitudinal range source populations, colonies did not differ in CTmax. Regardless colony origin, found exposing resulted lower CTmax, suggests accumulated. This study highlights experiences at near they experience field, have currently unknown implications its behavior.

Language: Английский

New record of the pavement ant, Tetramorium immigrans (Hymenoptera: Formicidae), in South Dakota with notes on its thermal tolerance and geographic distribution

The Great Lakes Entomologist, Journal Year: 2024, Volume and Issue: 56(2)

Published: March 5, 2024

The pavement ant, Tetramorium immigrans, is an abundant and widespread species across large portions of the United States. Yet despite its current distribution in Northeastern, Midwestern, Pacific, Western states, there a surprising lack records from Great Plains. Here we present updated county list T. immigrans museum collections research grade observations (459 counties; ~15% US counties), highlighting first one Plains state—South Dakota. Observations on community science platforms since 2006 have undoubtedly increased awareness (+329 ~72% all records), however posit that such may also highlight dispersal limitations this into less urban, colder Northern states Montana, Nebraska, North Dakota, South Wyoming (~5% 291 counties). As such, offer novel information immigrans' thermal biology including measurements critical limits, knock-down resistance, chill coma recovery. While can likely tolerate warm summer temperatures found Dakota due to heat tolerance hovering around 46°C, lower ability cold winter conditions be possible mechanism for limited dispersal.

Language: Английский

Experimental evidence of a Neotropical pest insect moderately tolerant to complete freezing

Journal of Thermal Biology, Journal Year: 2024, Volume and Issue: 123, P. 103939 - 103939

Published: July 1, 2024

Due to climate change, many regions are experiencing progressively milder winters. Consequently, pest insects from warm regions, particularly those with some tolerance low temperatures, could expand their geographic range into these traditionally colder regions. The palm borer moth (Paysandisia archon) is a Neotropical insect that in recent decades has reached Europe and Asia as one of the worst pests trees. Little known about its ability tolerate moderately cold winters and, therefore, colonize new areas. In this work, we characterized Paysandisia archon by measuring thermal limits: median lethal-temperature, LT50, chill-coma onset temperature, CTmin, supercooling point, SCP, freezing time survival. We found species was able survive short periods complete freezing, survival rates 87% after 30-min exposure, 33% for 1 h-exposure. It then freeze-tolerant species, contrast all other lepidopterans native areas, which freeze-intolerant. Additionally, investigated whether improved either or long pre-exposure sub-lethal temperatures. To end, studied potential changes main thermo-tolerance parameters using X-ray Computed Tomography, also morphological components pretreated animals. pre-exposures did not imply significant SCP CTmin values. contrast, larvae pretreatments both required longer times than groups. These long-term pre-exposed presented several changes, including reduction water content probably explained, at least part, higher Our results represent first characterization insect, be relevant better design strategies combat it.

Language: Английский