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      Impact of heat stress on the development of egg and adult coccinellid Serangium japonicum: evidence for cross-stage and cross-generation effects


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          Arthropod biological control agents are at risk due to climate change, since heat stress negatively impacts their life history traits. Here, we investigated ontogenetic variation of thermal sensitivity in an important whitefly predator, Serangium japonicum Chapin (Coleoptera: Coccinellidae). In particular, we evaluated the impact of heat shock on survival rate, development, and reproduction of S. japonicum, and checked whether the negative effects resulting from heat stress are stage-related. The two most heat-tolerant stages of S. japonicum (egg and adult) were exposed to heat shock treatments at 36, 39, and 42 ºC for 2 h, and 36 and 39 ºC for 4 h. We found that heat shock significantly reduced egg-to-adult survival rate, extended egg-to-adult development time, and decreased fecundity and oviposition period compared to control (27 ºC). The sex ratio however was not affected. Eggs exposed to heat shock led to adults whose weight and longevity were considerably reduced. The detrimental effects that resulted from heat shock were carried over to later life stages and even the next generation. Those carry-over effects were independent of stage except for egg-to-adult development time and adult weight. Our results suggest that releasing eggs or adults into fields or greenhouses makes little difference in reducing any negative impact on the developmental performance of S. japonicum induced by heat stress in a warming climate.

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          Most cited references57

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          Ecological and Evolutionary Responses to Recent Climate Change

          Ecological changes in the phenology and distribution of plants and animals are occurring in all well-studied marine, freshwater, and terrestrial groups. These observed changes are heavily biased in the directions predicted from global warming and have been linked to local or regional climate change through correlations between climate and biological variation, field and laboratory experiments, and physiological research. Range-restricted species, particularly polar and mountaintop species, show severe range contractions and have been the first groups in which entire species have gone extinct due to recent climate change. Tropical coral reefs and amphibians have been most negatively affected. Predator-prey and plant-insect interactions have been disrupted when interacting species have responded differently to warming. Evolutionary adaptations to warmer conditions have occurred in the interiors of species' ranges, and resource use and dispersal have evolved rapidly at expanding range margins. Observed genetic shifts modulate local effects of climate change, but there is little evidence that they will mitigate negative effects at the species level.
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            The sublethal effects of pesticides on beneficial arthropods.

            Traditionally, measurement of the acute toxicity of pesticides to beneficial arthropods has relied largely on the determination of an acute median lethal dose or concentration. However, the estimated lethal dose during acute toxicity tests may only be a partial measure of the deleterious effects. In addition to direct mortality induced by pesticides, their sublethal effects on arthropod physiology and behavior must be considered for a complete analysis of their impact. An increasing number of studies and methods related to the identification and characterization of these effects have been published in the past 15 years. Review of sublethal effects reported in published literature, taking into account recent data, has revealed new insights into the sublethal effects of pesticides including effects on learning performance, behavior, and neurophysiology. We characterize the different types of sublethal effects on beneficial arthropods, focusing mainly on honey bees and natural enemies, and we describe the methods used in these studies. Finally, we discuss the potential for developing experimental approaches that take into account these sublethal effects in integrated pest management and the possibility of integrating their evaluation in pesticide registration procedures.
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              Heat stress and the fitness consequences of climate change for terrestrial ectotherms


                Author and article information

                Entomologia Generalis
                Journal of General and Applied Entomology - Zeitschrift für Allgemeine und Angewandte Entomologie
                Schweizerbart Science Publishers (Stuttgart, Germany http://www.schweizerbart.com/ mail@ 123456schweizerbart.de )
                04 November 2020
                17 December 2020
                : 40
                : 4
                : 365-376
                1 State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, Institute of Plant Protection, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China
                2 Fujian Key Laboratory for Monitoring and Integrated Management of Crop Pests, Fuzhou 350013, China
                3 Université Côte d’Azur, INRAE, CNRS, UMR ISA, 06000, Nice, France
                Author notes
                96634 1096
                Copyright © 2020 E. Schweizerbart’sche Verlagsbuchhandlung, 70176 Stuttgart, Germany
                : 12 May 2020
                : 01 July 2020
                : 08 July 2020
                : 01 September 2020
                Page count
                Figures: 3, Tables: 4, Pages: 12
                Self URI (journal page): https://www.schweizerbart.de/journals/entomologia
                Custom metadata

                Entomology,Parasitology,Ecology,Molecular biology,Pests, Diseases & Weeds
                heat stress,lady beetle,development,climate change,biological control


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