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Xu Y, Song X, Li Y, Niu Y, Zhi L, Zong S, Tao J. Glycerol Metabolism is Important for the Low-Temperature Adaptation of a Global Quarantine Pest Anoplophora glabripennis Larvae. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2024. [PMID: 39083594 DOI: 10.1021/acs.jafc.4c03896] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/02/2024]
Abstract
Anoplophora glabripennis is a critical global quarantine pest. Recently, its distribution has been extended to colder and higher-latitude regions. The adaptation to low temperatures is vital for the successful colonization of insects in new environments. However, the metabolic pathways of A. glabripennis larvae under cold stress remain undefined. This study analyzed the larval hemolymph under different low-temperature treatments using LC-MS/MS. The results showed that differential metabolites associated with sugar and lipid metabolism are pivotal in the larval chill coma process. Under low-temperature treatments, the glycerol content increased significantly compared with the control group. Cold stress significantly induced the expression of AglaGK2 and AglaGPDHs. After undergoing RNAi treatment for 48 h, larvae exposed to -20 °C for 1 h showed reduced recovery when injected with ds-AglaGK2 and ds-AglaGPDH1 compared to the control group, indicating that glycerol biosynthesis plays a role in the low-temperature adaptation of A. glabripennis larvae. Our results provide a theoretical basis for clarifying the molecular mechanism of A. glabripennis larvae in response to environmental stresses.
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Affiliation(s)
- Yabei Xu
- Beijing Key Laboratory for Forest Pest Control, Beijing Forestry University, Beijing 100083, China
| | - Xue Song
- Beijing Key Laboratory for Forest Pest Control, Beijing Forestry University, Beijing 100083, China
| | - Yurong Li
- Beijing Key Laboratory for Forest Pest Control, Beijing Forestry University, Beijing 100083, China
| | - Yiming Niu
- Beijing Key Laboratory for Forest Pest Control, Beijing Forestry University, Beijing 100083, China
| | - Lingxu Zhi
- Beijing Key Laboratory for Forest Pest Control, Beijing Forestry University, Beijing 100083, China
| | - Shixiang Zong
- Beijing Key Laboratory for Forest Pest Control, Beijing Forestry University, Beijing 100083, China
| | - Jing Tao
- Beijing Key Laboratory for Forest Pest Control, Beijing Forestry University, Beijing 100083, China
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Shi F, Xing Y, Niu Y, Cheng L, Xu Y, Li X, Ren L, Zong S, Tao J. Unveiling winter survival strategies: physiological and metabolic responses to cold stress of Monochamus saltuarius larvae during overwintering. PEST MANAGEMENT SCIENCE 2024. [PMID: 38979967 DOI: 10.1002/ps.8282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2024] [Revised: 05/18/2024] [Accepted: 06/20/2024] [Indexed: 07/10/2024]
Abstract
BACKGROUND Monochamus saltuarius is a destructive trunk-borer of pine forest and an effective dispersal vector for pinewood nematode (PWN), a causative agent of pine wilt disease (PWD), which leads to major ecological disasters. Cold winter temperatures determine insect survival and distribution. However, little is known about the cold tolerance and potential physiological mechanisms of M. saltuarius. RESULTS We demonstrated that dead Pinus koraiensis trunks do not provide larvae with insulation. The M. saltuarius larvae are freeze-tolerant species. Unlike most other freeze-tolerant insects, they can actively freeze extracellular fluid at higher subzero temperatures by increasing their supercooling points. The main energy sources for larvae overwintering are glycogen and the mid-late switch to lipid. The water balance showed a decrease in free and an increase in bound water of small magnitude. Cold stress promoted lipid peroxidation, thus activating the antioxidant system to prevent cold-induced oxidative damage. We found eight main pathways linked to cold stress and 39 important metabolites, ten of which are cryoprotectants, including maltose, UDP-glucose, d-fructose 6P, galactinol, dulcitol, inositol, sorbitol, l-methionine, sarcosine, and d-proline. The M. saltuarius larvae engage in a dual respiration process involving both anaerobic and aerobic pathways when their bodily fluids freeze. Cysteine and methionine metabolism, as well as alanine, aspartate, and glutamate metabolism, are the most important pathways linked to antioxidation and energy production. CONCLUSIONS The implications of our findings may help strengthen and supplement the management strategies for monitoring, quarantine, and control of this pest, thereby contributing to controlling the further spread of PWD. © 2024 Society of Chemical Industry.
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Affiliation(s)
- Fengming Shi
- State Key Laboratory to Efficient Production of Forest Resources, Beijing Forestry University, Beijing, China
| | - Yu Xing
- State Key Laboratory to Efficient Production of Forest Resources, Beijing Forestry University, Beijing, China
| | - Yiming Niu
- State Key Laboratory to Efficient Production of Forest Resources, Beijing Forestry University, Beijing, China
| | - Ling Cheng
- State Key Laboratory to Efficient Production of Forest Resources, Beijing Forestry University, Beijing, China
| | - Yabei Xu
- State Key Laboratory to Efficient Production of Forest Resources, Beijing Forestry University, Beijing, China
| | - Xinyu Li
- State Key Laboratory to Efficient Production of Forest Resources, Beijing Forestry University, Beijing, China
| | - Lili Ren
- State Key Laboratory to Efficient Production of Forest Resources, Beijing Forestry University, Beijing, China
| | - Shixiang Zong
- State Key Laboratory to Efficient Production of Forest Resources, Beijing Forestry University, Beijing, China
| | - Jing Tao
- Beijing Key Laboratory for Forest Pest Control, Beijing Forestry University, Beijing, China
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Rozsypal J. Basking improves but winter warming worsens overwinter survival in the linden bug. JOURNAL OF INSECT PHYSIOLOGY 2024; 156:104655. [PMID: 38852905 DOI: 10.1016/j.jinsphys.2024.104655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2024] [Revised: 05/03/2024] [Accepted: 06/04/2024] [Indexed: 06/11/2024]
Abstract
The present study investigates the effects of rare winter basking behavior (observed in wild populations of the Linden bug, Pyrrhocoris apterus) and the effects of winter warming (predicted by climate models) on overwinter survival and physiology of P. apterus. The insects were exposed to scenarios simulating basking and winter warming in the laboratory. Part of the insects were exposed to real winters under semi-natural conditions in the field for comparison. The results show a clear positive effect of winter basking, implying that basking behavior is critical for overwinter survival in P. apterus. In contrast, winter warming was found to have a strong negative effect on overwinter survival, potentially representing a threat to central European populations of P. apterus. Physiological parameters (mass, water content, SCP, energy reserves) measured in this study cannot fully explain all the results. Further study is needed to better understand the mechanisms behind the positive effects of winter basking and the negative effects of winter warming on overwintering P. apterus.
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Affiliation(s)
- Jan Rozsypal
- Biology Centre CAS, Institute of Entomology, České Budějovice, Czechia.
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Toxopeus J, Dowle EJ, Andaloori L, Ragland GJ. Variation in Thermal Sensitivity of Diapause Development among Individuals and over Time Predicts Life History Timing in a Univoltine Insect. Am Nat 2024; 203:E200-E217. [PMID: 38781522 DOI: 10.1086/729515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2024]
Abstract
AbstractPhysiological time is important for understanding the development and seasonal timing of ectothermic animals but has largely been applied to developmental processes that occur during spring and summer, such as morphogenesis. There is a substantial knowledge gap in the relationship between temperature and development during winter, a season that is increasingly impacted by climate change. Most temperate insects overwinter in diapause, a developmental process with little obvious morphological change. We used principles from the physiological time literature to measure and model the thermal sensitivity of diapause development rate in the apple maggot fly Rhagoletis pomonella, a univoltine fly whose diapause duration varies substantially within and among populations. We show that diapause duration can be predicted by modeling a relationship between temperature and development rate that is shifted toward lower temperatures compared with typical models of morphogenic, nondiapause development. However, incorporating interindividual variation and ontogenetic variation in the temperature-to-development rate relationship was critical for accurately predicting fly emergence, as diapause development proceeded more quickly at high temperatures later in diapause. We conclude that the conceptual framework may be flexibly applied to other insects and discuss possible mechanisms of diapause timers and implications for phenology with warming winters.
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Short CA, Walters JL, Hahn DA. Bigger isn't always better: Challenging assumptions about the associations between diapause, body weight, and overwintering survival. Ecol Evol 2024; 14:e11511. [PMID: 38835525 PMCID: PMC11148123 DOI: 10.1002/ece3.11511] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2024] [Revised: 05/06/2024] [Accepted: 05/16/2024] [Indexed: 06/06/2024] Open
Abstract
During the winter, animals face limited food availability. Many animals enter dormancy to reduce their winter energy expenditure. Most insects spend the winter in diapause, a state of programmed dormancy. It is often assumed that diapausing insects need nutrient stores to fuel their many months of basal metabolism and must grow heavier than their non-diapause-programmed counterparts. However, the extent to which food limitation affects body weight during overwintering preparation as well as the likelihood and duration of diapause remains unclear. We limited the duration of the feeding period and thus the total quantity of food available to diapause-destined larvae of the pupal-diapausing flesh fly, Sarcophaga crassipalpis, to test how food limitation affects body weight in the context of diapause programming. We also tested the extent to which food deprivation and body weight affect the likelihood and duration of diapause. We hypothesized that diapause-destined larvae grow more quickly and pupariate at a heavier body weight than non-diapause larvae. We also hypothesized that body weight is more dramatically reduced by food limitations when a larva is programmed for diapause. Finally, we hypothesized that larvae with lighter body weight (i.e., food limited) are less likely to enter pupal diapause and also stay in diapause for a shorter duration than heavier, well-fed, individuals. Contrary to our hypotheses that diapausing insects are heavier than their non-diapausing counterparts, we found diapausing pupae weighed less than non-diapausing pupae, especially when larvae received limited food. We found light pupae did not abort their diapause program. In both diapausing and non-diapausing pupae, body weight was positively correlated with simulated winter survival. However, above a weight threshold, body weight no longer affected simulated winter survival in diapausing pupae. Contrary to our predictions and the general consensus in much of the diapause literature, we also found that lighter pupae stayed in diapause longer than heavier pupae. Overall, our results challenge the precept that body weight and diapause are positively associated. The relationship between body weight and diapause is complex and may be affected by the availability of food before and after winter, the availability of high-quality overwintering sites, and the life history of a particular insect.
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Affiliation(s)
- Clancy A Short
- Department of Entomology and Nematology The University of Florida Gainesville Florida USA
| | - Jared L Walters
- Department of Entomology and Nematology The University of Florida Gainesville Florida USA
| | - Daniel A Hahn
- Department of Entomology and Nematology The University of Florida Gainesville Florida USA
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Escobedo-Quevedo K, Lankheet MJ, Pen I, Trienens M, Helsen HHM, Wertheim B. Studying foraging behavior to improve bait sprays application to control Drosophila suzukii. BMC Ecol Evol 2024; 24:60. [PMID: 38734594 PMCID: PMC11088012 DOI: 10.1186/s12862-024-02251-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Accepted: 05/02/2024] [Indexed: 05/13/2024] Open
Abstract
BACKGROUND Foraging behavior in insects is optimised for locating scattered resources in a complex environment. This behavior can be exploited for use in pest control. Inhibition of feeding can protect crops whereas stimulation can increase the uptake of insecticides. For example, the success of a bait spray, depends on either contact or ingestion, and thus on the insect finding it. METHODS To develop an effective bait spray against the invasive pest, Drosophila suzukii, we investigated aspects of foraging behavior that influence the likelihood that the pest interacts with the baits, in summer and winter morphotypes. We video-recorded the flies' approach behavior towards four stimuli in a two-choice experiment on strawberry leaflets. To determine the most effective bait positioning, we also assessed where on plants the pest naturally forages, using a potted raspberry plant under natural environmental conditions. We also studied starvation resistance at 20 °C and 12 °C for both morphs. RESULTS We found that summer morph flies spent similar time on all baits (agar, combi-protec, yeast) whereas winter morphs spent more time on yeast than the other baits. Both morphs showed a preference to feed at the top of our plant's canopy. Colder temperatures enhanced survival under starvation conditions in both morphs, and mortality was reduced by food treatment. CONCLUSIONS These findings on feeding behavior support informed decisions on the type and placement of a bait to increase pest control.
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Affiliation(s)
- K Escobedo-Quevedo
- Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, The Netherlands.
| | - M J Lankheet
- Wageningen University & Research, Experimental Zoology WIAS, Wageningen, The Netherlands
| | - I Pen
- Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, The Netherlands
| | - M Trienens
- Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, The Netherlands
| | - H H M Helsen
- Wageningen University & Research, Field crops, Randwijk, The Netherlands
| | - B Wertheim
- Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, The Netherlands
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Makopa TP, Ncube T, Alwasel S, Boekhout T, Zhou N. Yeast-insect interactions in southern Africa: Tapping the diversity of yeasts for modern bioprocessing. Yeast 2024; 41:330-348. [PMID: 38450792 DOI: 10.1002/yea.3935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Revised: 01/31/2024] [Accepted: 02/19/2024] [Indexed: 03/08/2024] Open
Abstract
Yeast-insect interactions are one of the most interesting long-standing relationships whose research has contributed to our understanding of yeast biodiversity and their industrial applications. Although insect-derived yeast strains are exploited for industrial fermentations, only a limited number of such applications has been documented. The search for novel yeasts from insects is attractive to augment the currently domesticated and commercialized production strains. More specifically, there is potential in tapping the insects native to southern Africa. Southern Africa is home to a disproportionately high fraction of global biodiversity with a cluster of biomes and a broad climate range. This review presents arguments on the roles of the mutualistic relationship between yeasts and insects, the presence of diverse pristine environments and a long history of spontaneous food and beverage fermentations as the potential source of novelty. The review further discusses the recent advances in novelty of industrial strains of insect origin, as well as various ancient and modern-day industries that could be improved by use yeasts from insect origin. The major focus of the review is on the relationship between insects and yeasts in southern African ecosystems as a potential source of novel industrial yeast strains for modern bioprocesses.
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Affiliation(s)
- Tawanda P Makopa
- Department of Biological Sciences and Biotechnology, Botswana International University of Science and Technology, Palapye, Botswana
| | - Thembekile Ncube
- Department of Biology and Biochemistry, Faculty of Applied Science, National University of Science and Technology, Bulawayo, Zimbabwe
| | - Saleh Alwasel
- Department of Zoology, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Teun Boekhout
- Department of Zoology, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Nerve Zhou
- Department of Biological Sciences and Biotechnology, Botswana International University of Science and Technology, Palapye, Botswana
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Andersen MK, Roe AD, Liu Y, Musso AE, Fudlosid S, Haider F, Evenden ML, MacMillan HA. The freeze-avoiding mountain pine beetle (Dendroctonus ponderosae) survives prolonged exposure to stressful cold by mitigating ionoregulatory collapse. J Exp Biol 2024; 227:jeb247498. [PMID: 38682690 PMCID: PMC11128280 DOI: 10.1242/jeb.247498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2024] [Accepted: 04/02/2024] [Indexed: 05/01/2024]
Abstract
Insect performance is linked to environmental temperature, and surviving through winter represents a key challenge for temperate, alpine and polar species. To overwinter, insects have adapted a range of strategies to become truly cold hardy. However, although the mechanisms underlying the ability to avoid or tolerate freezing have been well studied, little attention has been given to the challenge of maintaining ion homeostasis at frigid temperatures in these species, despite this limiting cold tolerance for insects susceptible to mild chilling. Here, we investigated how prolonged exposure to temperatures just above the supercooling point affects ion balance in freeze-avoidant mountain pine beetle (Dendroctonus ponderosae) larvae in autumn, mid-winter and spring, and related it to organismal recovery times and survival. Hemolymph ion balance was gradually disrupted during the first day of exposure, characterized by hyperkalemia and hyponatremia, after which a plateau was reached and maintained for the rest of the 7-day experiment. The degree of ionoregulatory collapse correlated strongly with recovery times, which followed a similar asymptotical progression. Mortality increased slightly during extensive cold exposures, where hemolymph K+ concentration was highest, and a sigmoidal relationship was found between survival and hyperkalemia. Thus, the cold tolerance of the freeze-avoiding larvae of D. ponderosae appears limited by the ability to prevent ionoregulatory collapse in a manner similar to that of chill-susceptible insects, albeit at much lower temperatures. Based on these results, we propose that a prerequisite for the evolution of insect freeze avoidance may be a convergent or ancestral ability to maintain ion homeostasis during extreme cold stress.
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Affiliation(s)
| | - Amanda Diane Roe
- Natural Resources Canada, Canadian Forest Service, Great Lakes Forestry Centre, Sault Ste. Marie, ON, Canada, P6A 2E5
| | - Yuehong Liu
- Natural Resources Canada, Canadian Forest Service, Great Lakes Forestry Centre, Sault Ste. Marie, ON, Canada, P6A 2E5
| | - Antonia E. Musso
- Department of Biological Sciences, University of Alberta, Edmonton, AB, Canada, T6G 2E9
| | - Serita Fudlosid
- Department of Biology, Carleton University, Ottawa, ON, Canada, K1S 5B6
| | - Fouzia Haider
- Department of Biology, Carleton University, Ottawa, ON, Canada, K1S 5B6
| | - Maya L. Evenden
- Department of Biological Sciences, University of Alberta, Edmonton, AB, Canada, T6G 2E9
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Stabentheiner A, Mauerhofer T, Willfurth R, Kovac H, Stabentheiner E, Käfer H, Petrocelli I. The costs of overwintering in paper wasps (Polistes dominula and Polistes gallicus): the use of energy stores. J Comp Physiol B 2024; 194:131-144. [PMID: 38441658 PMCID: PMC11070328 DOI: 10.1007/s00360-024-01540-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Revised: 12/18/2023] [Accepted: 01/19/2024] [Indexed: 05/07/2024]
Abstract
Overwintering insects are facing energetic challenges because of food shortage, low temperature, and desiccation stress. Paper wasps of the genus Polistes overwinter as mated adults (gynes) in hibernacula protecting them from predation, snow, and rain but barely from low environmental temperature. In different climates, they face differing overwintering temperature regimes, and therefore they may differ in their energy use. We investigated how much of energy resources built up until autumn is used during diapause dormancy in natural hibernacula by measuring lipid, glycogen, and free carbohydrate content in autumn and early spring in Polistes dominula from temperate European (Austrian) and warm Mediterranean (Italian) climate and Polistes gallicus from Mediterranean climate. Winter energy consumption amounted to ~ 339 and ~ 310 J per wasp in the Austrian and Italian Polistes dominula populations. The smaller Italian Polistes gallicus consumed ~ 247 J. This amounts to 2.62, 2.35, and 1.79 J per day. Of this, the energy demand was mainly fuelled by lipids (84%, 93%, and 90%, respectively), but glycogen stores contributed also considerably (16%, 6%, and 9%). Free carbohydrates decreased only by 0.7%, 1%, and 0.8%. While fat stores seem still sufficient in spring, the wasps depleted most of their carbohydrates. The energy reserves of 396, 400, and 147 J per wasp remaining in spring in the three populations seem sufficient to fuel rest or simple brood care activities for a whole summer but restrict foraging flights to a few hours (~ 3.5-6 h). Results suggest that energy supply might become challenging in expected future climate scenarios.
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Affiliation(s)
- Anton Stabentheiner
- Institute of Biology, University of Graz, Universitätsplatz 2, 8010, Graz, Austria.
| | - Teresa Mauerhofer
- Institute of Biology, University of Graz, Universitätsplatz 2, 8010, Graz, Austria
| | - Regina Willfurth
- Institute of Biology, University of Graz, Universitätsplatz 2, 8010, Graz, Austria
| | - Helmut Kovac
- Institute of Biology, University of Graz, Universitätsplatz 2, 8010, Graz, Austria.
| | - Edith Stabentheiner
- Institute of Biology, University of Graz, Universitätsplatz 2, 8010, Graz, Austria
| | - Helmut Käfer
- Institute of Biology, University of Graz, Universitätsplatz 2, 8010, Graz, Austria
| | - Iacopo Petrocelli
- Dipartimento di Biologia, Università di Firenze, Via Madonna del Piano, 6, 50019, Sesto Fiorentino, Italy
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Gvoždík L. Individual variation in thermally induced plasticity of metabolic rates: ecological and evolutionary implications for a warming world. Philos Trans R Soc Lond B Biol Sci 2024; 379:20220494. [PMID: 38186270 PMCID: PMC10772608 DOI: 10.1098/rstb.2022.0494] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Accepted: 09/11/2023] [Indexed: 01/09/2024] Open
Abstract
Energy metabolism is a fundamental property of life providing the energy for all processes and functions within an organism. As it is temperature-dependent, it mediates the effects of changing climate on ectotherm fitness and population dynamics. Though resting metabolic rate is a highly labile trait, part of its variation is individually consistent. Recent findings show that resting metabolic rate contains consistent variation not only in the elevations (intercepts) but also in the slopes of individual thermal dependence curves, challenging the thermal dependence assumption for this trait in several ectotherm taxa. I argue that among-individual variation in thermal metabolic curves represents a previously undetected component of ectotherm response to climate change, potentially affecting their adaptive capacity and population resilience under increasing stochasticity of thermal environment. Future studies need to examine not only the amount of among-individual variation in thermal metabolic curves across phylogenetic contexts but also other aspects concerning its mechanisms and adaptive significance to improve predictions about the impact of climate change on ectotherm population dynamics. This article is part of the theme issue 'The evolutionary significance of variation in metabolic rates'.
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Affiliation(s)
- Lumír Gvoždík
- Czech Academy of Sciences, Institute of Vertebrate Biology, Květná 8, 60300 Brno, Czech Republic
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11
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Enriquez T, Visser B. The importance of fat accumulation and reserves for insect overwintering. CURRENT OPINION IN INSECT SCIENCE 2023; 60:101118. [PMID: 37739063 DOI: 10.1016/j.cois.2023.101118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Revised: 09/16/2023] [Accepted: 09/18/2023] [Indexed: 09/24/2023]
Abstract
Winter is a challenging season for ectothermic species such as insects. In addition to thermal stress imposed by cold temperatures, food scarcity during winter can lead to starvation and energy drain. In preparation for winter, most insects accumulate lipid (fat) reserves, which are the principal source of energetic fuel during overwintering. In this review, we highlight the most recent literature on lipid metabolism in response to cold. We first discuss how lipid metabolism is affected by biotic and abiotic environmental changes in preparation for winter. We then highlight how lipid dynamics are affected during winter, including physiological and (epi)genetic mechanisms. We end our review emphasizing the importance of remaining fat reserves in spring and how climate change can negatively impact lipid metabolism and fitness.
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Affiliation(s)
- Thomas Enriquez
- Evolution and Ecophysiology Group, Department of Functional and Evolutionary Entomology, University of Liège - Gembloux Agro-Bio Tech, Gembloux, Belgium.
| | - Bertanne Visser
- Evolution and Ecophysiology Group, Department of Functional and Evolutionary Entomology, University of Liège - Gembloux Agro-Bio Tech, Gembloux, Belgium
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12
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Roberts KT, Szejner-Sigal A, Lehmann P. Seasonal energetics: are insects constrained by energy during dormancy? J Exp Biol 2023; 226:jeb245782. [PMID: 37921417 DOI: 10.1242/jeb.245782] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2023]
Abstract
In seasonal environments, many animals, including insects, enter dormancy, where they are limited to a fixed energy budget. The inability to replenish energetic stores during these periods suggests insects should be constrained by pre-dormancy energy stores. Over the last century, the community of researchers working on survival during dormancy has operated under the strong assumption that energy limitation is a key fitness trait driving the evolution of seasonal strategies. That is, energy use has to be minimized during dormancy because insects otherwise run out of energy and die during dormancy, or are left with too little energy to complete development, reproductive maturation or other costly post-dormancy processes such as dispersal or nest building. But if energy is so strongly constrained during dormancy, how can some insects - even within the same species and population - be dormant in very warm environments or show prolonged dormancy for many successive years? In this Commentary, we discuss major assumptions regarding dormancy energetics and outline cases where insects appear to align with our assumptions and where they do not. We then highlight several research directions that could help link organismal energy use with landscape-level changes. Overall, the optimal energetic strategy during dormancy might not be to simply minimize metabolic rate, but instead to maintain a level that matches the demands of the specific life-history strategy. Given the influence of temperature on energy use rates of insects in winter, understanding dormancy energetic strategies is critical in order to determine the potential impacts of climate change on insects in seasonal environments.
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Affiliation(s)
- Kevin T Roberts
- Department of Zoology, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Andre Szejner-Sigal
- Department of Integrative Biology, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Philipp Lehmann
- Department of Zoology, Stockholm University, SE-106 91 Stockholm, Sweden
- Department of Animal Physiology, Zoological Institute and Museum, University of Greifswald, 17489 Greifswald, Germany
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13
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Kovac H, Käfer H, Petrocelli I, Amstrup AB, Stabentheiner A. The Impact of Climate on the Energetics of Overwintering Paper Wasp Gynes ( Polistes dominula and Polistes gallicus). INSECTS 2023; 14:849. [PMID: 37999050 PMCID: PMC10672273 DOI: 10.3390/insects14110849] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Revised: 10/13/2023] [Accepted: 10/27/2023] [Indexed: 11/25/2023]
Abstract
Gynes of paper wasps (Polistes sp.) spend the cold season in sheltered hibernacles. These hibernacles protect against predators and adverse weather conditions but offer only limited protection against low temperatures. During overwintering diapause, wasps live on the energy they store. We investigated the hibernacles' microclimate conditions of species from the Mediterranean (Italy, P. dominula, P. gallicus) and temperate (Austria, P. dominula) climates in order to describe the environmental conditions and calculate the energetic demand of overwintering according to standard metabolic rate functions. The temperatures at the hibernacles differed significantly between the Mediterranean and temperate habitats (average in Austria: 3.2 ± 5.71 °C, in Italy: 8.5 ± 5.29 °C). In both habitats, the hibernacle temperatures showed variance, but the mean hibernacle temperature corresponded closely to the meteorological climate data. Cumulative mass-specific energetic costs over the studied period were the lowest for the temperate P. dominula population compared with both Mediterranean species. The lower costs of the temperate species were a result of the lower hibernacle temperature and acclimation to lower environmental temperatures. Model calculations with an increased mean temperature of up to 3 °C due to climate change indicate a dramatic increase of up to 40% in additional costs.
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Affiliation(s)
- Helmut Kovac
- Institute of Biology, University of Graz, Universitätsplatz 2, 8010 Graz, Austria
| | - Helmut Käfer
- Institute of Biology, University of Graz, Universitätsplatz 2, 8010 Graz, Austria
| | - Iacopo Petrocelli
- Dipartimento di Biologia, Università di Firenze, Via Madonna del Piano 6, 50019 Sesto Fiorentino, Italy
| | - Astrid B. Amstrup
- Institute of Biology, University of Graz, Universitätsplatz 2, 8010 Graz, Austria
- Department of Biology—Genetics, Ecology and Evolution, 8000 Aarhus, Denmark
| | - Anton Stabentheiner
- Institute of Biology, University of Graz, Universitätsplatz 2, 8010 Graz, Austria
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14
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Roberts KT, Stillman JH, Rank NE, Dahlhoff EP, Bracewell RR, Elmore J, Williams CM. Transcriptomic evidence indicates that montane leaf beetles prioritize digestion and reproduction in a sex-specific manner during emergence from dormancy. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY. PART D, GENOMICS & PROTEOMICS 2023; 47:101088. [PMID: 37210884 DOI: 10.1016/j.cbd.2023.101088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Revised: 05/10/2023] [Accepted: 05/11/2023] [Indexed: 05/23/2023]
Abstract
During winter, many organisms conserve resources by entering dormancy, suppressing metabolism and biosynthesis. The transition out of winter dormancy to summer activity requires a quick reversal of this suppression, in order to exploit now-favorable environmental conditions. To date, mechanisms by which winter climate variation affects this transition remains unelucidated. Here we experimentally manipulated snow cover for naturally overwintering montane leaf beetles (Chrysomela aeneicollis), and profiled changes in gene expression during the transition out of dormancy in spring. Upon emergence, beetles up-regulate transcripts associated with digestion and nutrient acquisition and down regulate those associated with lipid metabolism, suggesting a shift away from utilizing stored lipid and towards digestion of carbohydrate-rich host plant tissue. Development of digestive capacity is followed by up-regulation of transcripts associated with reproduction; a transition that occurs earlier in females than males. Snow manipulation strongly affected the ground thermal regime and correspondingly gene expression profiles, with beetles showing a delayed up-regulation of reproduction in the dry compared to snowy plots. This suggests that winter conditions can alter the timing and prioritization of processes during emergence from dormancy, potentially magnifying the effects of declining snow cover in the Sierra's and other snowy mountains.
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Affiliation(s)
- Kevin T Roberts
- Department of Integrative Biology, University of California, Berkeley, CA, USA; Department of Zoology, Stockholm University, Stockholm, Sweden.
| | - Jonathon H Stillman
- Department of Integrative Biology, University of California, Berkeley, CA, USA; Department of Biology, San Francisco State University, San Francisco, CA, USA
| | - Nathan E Rank
- Department of Biology, Sonoma State University, Rohnert Park, CA, USA
| | | | - Ryan R Bracewell
- Department of Integrative Biology, University of California, Berkeley, CA, USA; Department of Biology, Indiana University, Bloomington, IN, USA
| | - Joanna Elmore
- Department of Biology, Sonoma State University, Rohnert Park, CA, USA
| | - Caroline M Williams
- Department of Integrative Biology, University of California, Berkeley, CA, USA
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15
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Sturiale SL, Armbruster PA. Contrasting effects of an extended fall period and winter heatwaves on the overwintering fitness of diapausing disease vector, Aedes albopictus. CURRENT RESEARCH IN INSECT SCIENCE 2023; 4:100067. [PMID: 38161991 PMCID: PMC10757285 DOI: 10.1016/j.cris.2023.100067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Revised: 08/03/2023] [Accepted: 08/04/2023] [Indexed: 01/03/2024]
Abstract
Climate change is expected to dramatically alter autumnal and winter conditions in many temperate regions. However, limited data is available to accurately predict how these changes will impact species' overwinter survival and post-winter fitness. Here, we determine how a longer, warmer fall period and winter heatwaves affect overwintering fitness and post-winter performance of the invasive mosquito vector, Aedes albopictus. We found that a longer, warmer fall period representative of early entry into diapause did not affect overwinter survival but did lead to reduced post-winter performance for multiple traits. Specifically, larvae that experienced longer, warmer fall conditions as diapause embryos exhibited reduced post-diapause larval starvation tolerance, increased post-diapause larval mortality, and longer post-diapause larval development compared to individuals from the short-fall treatments. These negative post-diapause fitness effects likely resulted from the greater energetic demands and/or damage incurred during the warmer, longer fall period. In contrast, exposure to winter heatwaves increased overwinter survival, possibly by allowing diapausing embryos to escape or repair cold injury. Finally, fall treatment and winter heatwaves had an interactive effect on male development time, while neither treatment impacted pupal mass in either sex. Overall, our results highlight that experiments that fail to measure post-diapause fitness are likely to substantially under-estimate the impacts of climate change on post-winter performance. Additionally, our results emphasize that it is crucial to consider the potentially conflicting effects of different aspects of climate change on a species' overall overwintering success.
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Affiliation(s)
- Samantha L. Sturiale
- Department of Biology, Georgetown University, Washington, DC 20057, United States
| | - Peter A. Armbruster
- Department of Biology, Georgetown University, Washington, DC 20057, United States
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16
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Mbande A, Mutamiswa R, Chidawanyika F. Ontogenetic responses of physiological fitness in Spodoptera frugiperda (Lepidoptera: Noctuidae) in response to repeated cold exposure. BULLETIN OF ENTOMOLOGICAL RESEARCH 2023; 113:449-455. [PMID: 37587795 DOI: 10.1017/s0007485323000111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/18/2023]
Abstract
In this era of global climate change, intrinsic rapid and evolutionary responses of invasive agricultural pests to thermal variability are of concern given the potential implications on their biogeography and dire consequences on human food security. For insects, chill coma recovery time (CCRT) and critical thermal minima (CTmin), the point at which neuromuscular coordination is lost following cold exposure, remain good indices for cold tolerance. Using laboratory-reared Spodoptera frugiperda (Lepidoptera: Noctuidae), we explored cold tolerance repeated exposure across life stages of this invasive insect pest. Specifically, we measured their CTmin and CCRT across four consecutive assays, each 24 h apart. In addition, we assessed body water content (BWC) and body lipid content (BLC) of the life stages. Our results showed that CTmin improved with repeated exposure in 5th instar larvae, virgin males and females while CCRT improved in 4th, 5th and 6th instar larvae following repeated cold exposure. In addition, the results revealed evidence of cold hardening in this invasive insect pest. However, there was no correlation between cold tolerance and BWC as well as BLC. Our results show capacity for cold hardening and population persistence of S. frugiperda in cooler environments. This suggests potential of fall armyworm (FAW) to withstand considerable harsh winter environments typical of its recently invaded geographic range in sub-Saharan Africa.
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Affiliation(s)
- Abongile Mbande
- Department of Zoology and Entomology, University of the Free State, Bloemfontein, South Africa
| | - Reyard Mutamiswa
- Department of Zoology and Entomology, University of the Free State, Bloemfontein, South Africa
- Tugwi-Mukosi Multidisciplinary Research Institute, Midlands State University, Gweru, Zimbabwe
- Department of Zoology and Entomology, Rhodes University, Makhanda, South Africa
| | - Frank Chidawanyika
- Department of Zoology and Entomology, University of the Free State, Bloemfontein, South Africa
- International Centre of Insect Physiology and Ecology (ICIPE), Nairobi, Kenya
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17
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Fyie LR, Tronetti HR, Gardiner MM, Meuti ME. Potential for urban warming to postpone overwintering dormancy of temperate mosquitoes. J Therm Biol 2023; 115:103594. [PMID: 37429087 DOI: 10.1016/j.jtherbio.2023.103594] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 05/15/2023] [Accepted: 05/17/2023] [Indexed: 07/12/2023]
Abstract
Cities are generally hotter than surrounding rural areas due to the Urban Heat Island (UHI) effect. These increases in temperature advance plant and animal phenology, development, and reproduction in the spring. However, research determining how increased temperatures affect the seasonal physiology of animals in the fall has been limited. The Northern house mosquito, Culex pipiens, is abundant in cities and transmits several pathogens including West Nile virus. Females of this species enter a state of developmental arrest, or reproductive diapause, in response to short days and low temperatures during autumn. Diapausing females halt reproduction and blood-feeding, and instead accumulate fat and seek sheltered overwintering sites. We found that exposure to increased temperatures in the lab that mimic the UHI effect induced ovarian development and blood-feeding, and that females exposed to these temperatures were as fecund as non-diapausing mosquitoes. We also found that females exposed to higher temperatures had lower survival rates in winter-like conditions, despite having accumulated equivalent lipid reserves relative to their diapausing congeners. These data suggest that urban warming may inhibit diapause initiation in the autumn, thereby extending the active biting season of temperate mosquitoes.
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Affiliation(s)
- Lydia R Fyie
- Department of Entomology, The Ohio State University, 2021 Coffey Rd, Columbus, OH, USA, 43210.
| | - Hannah R Tronetti
- Department of Animal Sciences, The Ohio State University, 2029 Fyffe Rd, Columbus, OH, USA, 43210
| | - Mary M Gardiner
- Department of Entomology, The Ohio State University, 2021 Coffey Rd, Columbus, OH, USA, 43210
| | - Megan E Meuti
- Department of Entomology, The Ohio State University, 2021 Coffey Rd, Columbus, OH, USA, 43210
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18
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Penk SR, Sadana P, Archer LC, Pagano AM, Cattet MRL, Lunn NJ, Thiemann GW, Molnár PK. A body composition model with multiple storage compartments for polar bears ( Ursus maritimus). CONSERVATION PHYSIOLOGY 2023; 11:coad043. [PMID: 37346266 PMCID: PMC10281502 DOI: 10.1093/conphys/coad043] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Revised: 05/08/2023] [Accepted: 06/15/2023] [Indexed: 06/23/2023]
Abstract
Climate warming is rapidly altering Arctic ecosystems. Polar bears (Ursus maritimus) need sea ice as a platform from which to hunt seals, but increased sea-ice loss is lengthening periods when bears are without access to primary hunting habitat. During periods of food scarcity, survival depends on the energy that a bear has stored in body reserves, termed storage energy, making this a key metric in predictive models assessing climate change impacts on polar bears. Here, we developed a body composition model for polar bears that estimates storage energy while accounting for changes in storage tissue composition. We used data of dissected polar bears (n = 31) to link routinely collected field measures of total body mass and straight-line body length to the body composition of individual bears, described in terms of structural mass and two storage compartments, adipose and muscle. We then estimated the masses of metabolizable proteins and lipids within these storage compartments, giving total storage energy. We tested this multi-storage model by using it to predict changes in the lipid stores from an independent dataset of wild polar bears (n = 36) that were recaptured 8-200 days later. Using length and mass measurements, our model successfully predicted direct measurements of lipid changes via isotopic dilutions (root mean squared error of 14.5 kg). Separating storage into two compartments, and allowing the molecular composition of storage to vary, provides new avenues for quantifying energy stores of individuals across their life cycle. The multi-storage body composition model thus provides a basis for further exploring energetic costs of physiological processes that contribute to individual survival and reproductive success. Given bioenergetic models are increasingly used as a tool to predict individual fitness and population dynamics, our approach for estimating individual energy stores could be applicable to a wide range of species.
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Affiliation(s)
- Stephanie R Penk
- Corresponding author: Laboratory of Quantitative Global Change Ecology, Department of Biological Sciences, University of Toronto Scarborough, 1265 Military Trail, Scarborough, Ontario M1C 1A4, Canada. E-mail:
| | - Pranav Sadana
- Laboratory of Quantitative Global Change Ecology, Department of Biological Sciences, University of Toronto Scarborough, 1265 Military Trail, Scarborough, Ontario M1C 1A4, Canada
- Department of Biology, University of Winnipeg, 515 Portage Ave, Winnipeg, Manitoba R3B 2E9, Canada
| | - Louise C Archer
- Laboratory of Quantitative Global Change Ecology, Department of Biological Sciences, University of Toronto Scarborough, 1265 Military Trail, Scarborough, Ontario M1C 1A4, Canada
| | - Anthony M Pagano
- U.S. Geological Survey, Alaska Science Center, 4210 University Dr., Anchorage, AK 99508 USA
| | - Marc R L Cattet
- Fish and Wildlife Branch, Department of Environment, Government of Yukon, 10 Burns Road, Whitehorse, Yukon Y1A 4Y9, Canada
| | - Nicholas J Lunn
- Wildlife Research Division, Science and Technology Branch, Environment Canada and Climate Change Canada, 11455 Saskatchewan Dr., Edmonton, Alberta T6G 2E9, Canada
| | - Gregory W Thiemann
- Faculty of Environmental and Urban Change, York University, 4700 Keele St., Toronto, Ontario M3J 1P3, Canada
| | - Péter K Molnár
- Laboratory of Quantitative Global Change Ecology, Department of Biological Sciences, University of Toronto Scarborough, 1265 Military Trail, Scarborough, Ontario M1C 1A4, Canada
- Department of Ecology and Evolutionary Biology, University of Toronto, 25 Willcocks Street, Toronto, Ontario M5S 3B2 Canada
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19
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Lebenzon JE, Overgaard J, Jørgensen LB. Chilled, starved or frozen: Insect mitochondrial adaptations to overcome the cold. CURRENT OPINION IN INSECT SCIENCE 2023:101076. [PMID: 37331596 DOI: 10.1016/j.cois.2023.101076] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2023] [Revised: 06/13/2023] [Accepted: 06/13/2023] [Indexed: 06/20/2023]
Abstract
Physiological adaptations to tackle cold exposure are crucial for insects living in temperate and arctic environments and here we review how cold adaptation is manifested in terms of mitochondrial function. Cold challenges are diverse, and different insect species have evolved metabolic and mitochondrial adaptations to: i) energize homeostatic regulation at low temperature, ii) stretch energy reserves during prolonged cold exposure, and iii) preserve structural organization of organelles following extracellular freezing. While the literature is still sparse, our review suggests that cold-adapted insects preserve ATP production at low temperatures by maintaining preferred mitochondrial substrate oxidation, which is otherwise challenged in cold-sensitive species. Chronic cold exposure and metabolic depression during dormancy is linked to reduced mitochondrial metabolism and may involve mitochondrial degradation. Finally, adaptation to extracellular freezing could be associated with superior structural integrity of the mitochondrial inner membrane following freezing which is linked to cellular and organismal survival.
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Affiliation(s)
- Jacqueline E Lebenzon
- Department of Integrative Biology, University of California, Berkeley, Berkeley, CA 94720, USA.
| | - Johannes Overgaard
- Section for Zoophysiology, Department of Biology, Aarhus University, 8000 Aarhus C, Denmark.
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20
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Kozel P, Novak T, Janžekovič F, Lipovšek S. Starvation hardiness as preadaptation for life in subterranean habitats. Sci Rep 2023; 13:9643. [PMID: 37316704 DOI: 10.1038/s41598-023-36556-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2022] [Accepted: 06/06/2023] [Indexed: 06/16/2023] Open
Abstract
Most subterranean habitats, especially caves, are considered extreme environments, mainly because of the limited and erratic food supply and constant darkness. In temperate regions, many climatic conditions, such as temperature and air humidity, are periodically less adverse or even more favourable in caves than the harsh seasonal weather on the surface. Accordingly, many animal species search for hibernacula in caves. These overwintering, non-specialized subterranean species (non-troglobionts) show various modes of dormancy and ongoing development. Since they do not feed, they all undergo periodic starvation, a preadaptation, which might evolve in permanent starvation hardiness, such as found in most specialized subterranean species (troglobionts). To this end, we performed a comparative analysis of energy-supplying compounds in eleven most common terrestrial non-troglobiont species during winter in central European caves. We found highly heterogeneous responses to starvation, which are rather consistent with the degree of energetic adaptation to the habitat than to overwintering mode. The consumption of energy-supplying compounds was strongly higher taxa-dependant; glycogen is the main energy store in gastropods, lipids in insects, and arachnids rely on both reserve compounds. We assume that permanent starvation hardiness in specialized subterranean species might evolved in many different ways as shown in this study.
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Affiliation(s)
- Peter Kozel
- Department of Biology, Faculty of Natural Sciences and Mathematics, University of Maribor, Koroška Cesta 160, 2000, Maribor, Slovenia.
- Research Centre of the Slovenian Academy of Science and Arts, Karst Research Institute, Titov Trg 2, 6230, Postojna, Slovenia.
| | - Tone Novak
- Department of Biology, Faculty of Natural Sciences and Mathematics, University of Maribor, Koroška Cesta 160, 2000, Maribor, Slovenia
| | - Franc Janžekovič
- Department of Biology, Faculty of Natural Sciences and Mathematics, University of Maribor, Koroška Cesta 160, 2000, Maribor, Slovenia
| | - Saška Lipovšek
- Department of Biology, Faculty of Natural Sciences and Mathematics, University of Maribor, Koroška Cesta 160, 2000, Maribor, Slovenia
- Faculty of Medicine, University of Maribor, Taborska Ulica 8, 2000, Maribor, Slovenia
- Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova Ulica 17, 2000, Maribor, Slovenia
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21
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Wang N, Ji A, Masoudi A, Li S, Hu Y, Zhang Y, Yu Z, Wang H, Wang H, Liu J. Protein regulation mechanism of cold tolerance in Haemaphysalis longicornis. INSECT SCIENCE 2023; 30:725-740. [PMID: 36285346 DOI: 10.1111/1744-7917.13133] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2022] [Revised: 09/03/2022] [Accepted: 09/28/2022] [Indexed: 06/15/2023]
Abstract
Ticks are external parasitic arthropods that can transmit a variety of pathogens by sucking blood. Low-temperature tolerance is essential for ticks to survive during the cold winter. Exploring the protein regulation mechanism of low-temperature tolerance of Haemaphysalis longicornis could help to explain how ticks survive in winter. In this study, the quantitative proteomics of several tissues of H. longicornis exposed to low temperature were studied by data independent acquisition technology. Totals of 3 699, 3 422, and 1 958 proteins were identified in the salivary gland, midgut, and ovary, respectively. The proteins involved in energy metabolism, cell signal transduction, protein synthesis and repair, and cytoskeleton synthesis changed under low-temperature stress. The comprehensive analysis of the protein regulation of multiple tissues of female ticks exposed to low temperature showed that maintaining cell homeostasis, maintaining cell viability, and enhancing cell tolerance were the most important means for ticks to maintain vital signs under low temperature. The expression of proteins involved in and regulating the above cell activities was the key to the survival of ticks under low temperatures. Through the analysis of a large amount of data, we found that the expression levels of arylamine N-acetyltransferase, inositol polyphosphate multikinase, and dual-specificity phosphatase were up-regulated under low temperature. We speculated that they might have important significance in low-temperature tolerance. Then, we performed RNA interference on the mRNA of these 3 proteins, and the results showed that the ability of female ticks to tolerate low temperatures decreased significantly.
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Affiliation(s)
- Ningmei Wang
- Ministry of Education Key Laboratory of Molecular and Cellular Biology, Hebei Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang, China
| | - Aimeng Ji
- Ministry of Education Key Laboratory of Molecular and Cellular Biology, Hebei Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang, China
| | - Abolfazl Masoudi
- Ministry of Education Key Laboratory of Molecular and Cellular Biology, Hebei Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang, China
| | - Shuang Li
- Ministry of Education Key Laboratory of Molecular and Cellular Biology, Hebei Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang, China
| | - Yuhong Hu
- Instrumental Analysis Center, Hebei Normal University, Shijiazhuang, China
| | - Yefei Zhang
- Hebei Xiaowutai Mountain National Nature Reserve Management Center, Zhangjiakou, Hebei Province, China
| | - Zhijun Yu
- Ministry of Education Key Laboratory of Molecular and Cellular Biology, Hebei Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang, China
| | - Han Wang
- Ministry of Education Key Laboratory of Molecular and Cellular Biology, Hebei Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang, China
| | - Hui Wang
- Ministry of Education Key Laboratory of Molecular and Cellular Biology, Hebei Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang, China
| | - Jingze Liu
- Ministry of Education Key Laboratory of Molecular and Cellular Biology, Hebei Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang, China
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22
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Xia Q, Chen C, Dopman EB, Hahn DA. Divergence in cell cycle progression is associated with shifted phenology in a multivoltine moth: the European corn borer, Ostrinia nubilalis. J Exp Biol 2023; 226:jeb245244. [PMID: 37293992 PMCID: PMC10281267 DOI: 10.1242/jeb.245244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Accepted: 05/10/2023] [Indexed: 05/20/2023]
Abstract
Evolutionary change in diapause timing can be an adaptive response to changing seasonality, and even result in ecological speciation. However, the molecular and cellular mechanisms regulating shifts in diapause timing remain poorly understood. One of the hallmarks of diapause is a massive slowdown in the cell cycle of target organs such as the brain and primordial imaginal structures, and resumption of cell cycle proliferation is an indication of diapause termination and resumption of development. Characterizing cell cycle parameters between lineages differing in diapause life history timing may help identify molecular mechanisms associated with alterations of diapause timing. We tested the extent to which progression of the cell cycle differs across diapause between two genetically distinct European corn borer strains that differ in their seasonal diapause timing. We show the cell cycle slows down during larval diapause with a significant decrease in the proportion of cells in S phase. Brain-subesophageal complex cells slow primarily in G0/G1 phase whereas most wing disc cells are in G2 phase. Diapausing larvae of the earlier emerging, bivoltine E-strain (BE) suppressed cell cycle progression less than the later emerging, univoltine Z-strain (UZ) individuals, with a greater proportion of cells in S phase across both tissues during diapause. Additionally, resumption of cell cycle proliferation occurred earlier in the BE strain than in the UZ strain after exposure to diapause-terminating conditions. We propose that regulation of cell cycle progression rates ultimately drives differences in larval diapause termination, and adult emergence timing, between early- and late-emerging European corn borer strains.
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Affiliation(s)
- Qinwen Xia
- Entomology and Nematology Department, University of Florida, Gainesville, FL 32611, USA
| | - Chao Chen
- Entomology and Nematology Department, University of Florida, Gainesville, FL 32611, USA
| | - Erik B. Dopman
- Department of Biology, Tufts University, Medford, MA 02155, USA
| | - Daniel A. Hahn
- Entomology and Nematology Department, University of Florida, Gainesville, FL 32611, USA
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23
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Prileson EG, Clark J, Diamond SE, Lenard A, Medina-Báez OA, Yilmaz AR, Martin RA. Keep your cool: Overwintering physiology in response to urbanization in the acorn ant, Temnothorax curvispinosus. J Therm Biol 2023; 114:103591. [PMID: 37276746 DOI: 10.1016/j.jtherbio.2023.103591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Revised: 05/04/2023] [Accepted: 05/05/2023] [Indexed: 06/07/2023]
Abstract
Winter presents a challenge for survival, yet temperate ectotherms have remarkable physiological adaptations to cope with low-temperature conditions. Under recent climate change, rather than strictly relaxing pressure on overwintering survival, warmer winters can instead disrupt these low-temperature trait-environment associations, with negative consequences for populations. While there is increasing evidence of physiological adaptation to contemporary warming during the growing season, the effects of winter warming on physiological traits are less clear. To address this knowledge gap, we performed a common garden experiment using relatively warm-adapted versus cold-adapted populations of the acorn ant, Temnothorax curvispinosus, sampled across an urban heat island gradient, to explore the effects of winter conditions on plasticity and evolution of physiological traits. We found no evidence of evolutionary divergence in chill coma recovery nor in metabolic rate at either of two test temperatures (4 and 10 °C). Although we found the expected plastic response of increased metabolic rate under the 10 °C acute test temperature as compared with the 4 °C test temperature, this plastic response, (i.e., the acute thermal sensitivity of metabolic rate), was not different across populations. Surprisingly, we found that winter-acclimated urban ant populations exhibited higher heat tolerance compared with rural ant populations, and that the magnitude of divergence was comparable to that observed among growing-season acclimated ants. Finally, we found no evidence of differences between populations with respect to changes in colony size from the beginning to the end of the overwintering experiment. Together, these findings indicate that despite the evolution of higher heat tolerance that is often accompanied by losses in low-temperature tolerance, urban acorn ants have retained several components of low-temperature physiological performance when assessed under ecologically relevant overwintering conditions. Our study suggests the importance of measuring physiological traits under seasonally-relevant conditions to understand the causes and consequences of evolutionary responses to contemporary warming.
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Affiliation(s)
- Eric G Prileson
- Case Western Reserve University, Department of Biology, USA.
| | - Jordan Clark
- Case Western Reserve University, Department of Biology, USA
| | | | - Angie Lenard
- Case Western Reserve University, Department of Biology, USA
| | | | - Aaron R Yilmaz
- USDA Agricultural Research Service, Horticultural Insects Research Laboratory, USA
| | - Ryan A Martin
- Case Western Reserve University, Department of Biology, USA
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24
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Vercher R, González S, Sánchez-Domingo A, Sorribas J. A Novel Insect Overwintering Strategy: The Case of Mealybugs. INSECTS 2023; 14:insects14050481. [PMID: 37233109 DOI: 10.3390/insects14050481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Revised: 04/24/2023] [Accepted: 05/06/2023] [Indexed: 05/27/2023]
Abstract
Insects have limited ability to regulate their body temperature and have thus required a range of strategies to withstand thermally stressful environments. Under unfavorable winter conditions, insects often take refuge under the soil surface to survive. Here, the mealybug insect family was selected for the study. Field experiments were performed in fruit orchards in eastern Spain. We used specifically designed floor sampling methods combined with fruit tree canopy pheromone traps. We found that in temperate climates, the large majority of the mealybugs move from the tree canopy to the roots during the winter, where they turn into belowground root-feeding herbivores to survive and continue underground the reproductive process. Within the rhizosphere, mealybugs complete at least one generation before emerging on the soil surface. The preferred area to overwinter is within 1 m in diameter around the fruit tree trunk, where more than 12,000 mealybug flying males per square meter can emerge every spring. This overwintering pattern has not previously been reported for any other group of insects showing cold avoidance behavior. These findings have implications at the winter ecology level but also at the agronomical level since treatments to control mealybug pests are, until now, only based on the fruit trees' canopy.
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Affiliation(s)
- Rosa Vercher
- Escuela Técnica Superior de Ingeniería Agronómica y del Medio Natural, Universitat Politènica de València, Camino de Vera, s/n, 46022 Valencia, Spain
| | - Sandra González
- Escuela Técnica Superior de Ingeniería Agronómica y del Medio Natural, Universitat Politènica de València, Camino de Vera, s/n, 46022 Valencia, Spain
| | - Adrián Sánchez-Domingo
- Escuela Técnica Superior de Ingeniería Agronómica y del Medio Natural, Universitat Politènica de València, Camino de Vera, s/n, 46022 Valencia, Spain
| | - Juan Sorribas
- Universitat Politènica de València, Camino de Vera, s/n, 46022 Valencia, Spain
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Pugesek G, Thuma JA, Crone EE. First field-based estimates of bumblebee diapause survival rates showcase high survivorship in the wild. JOURNAL OF INSECT CONSERVATION 2023; 27:1-10. [PMID: 37360646 PMCID: PMC10164617 DOI: 10.1007/s10841-023-00478-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Accepted: 04/22/2023] [Indexed: 06/28/2023]
Abstract
Abstract Bumblebee (Bombus spp.) queens overwintered in artificial settings tend to have low survival rates, raising concerns that diapause may be a particularly sensitive life cycle stage for this ecologically and economically valuable group of pollinators. However, it remains unclear whether lab-based estimates of diapause survival are comparable to survival rates of natural populations. In this study, we monitored the survival of Bombus impatiens queens overwintering in the field in Ipswich, MA, and conducted a meta-analysis of studies that estimate queen diapause survival in the lab to compare our field-based estimates of survival to those of lab-based studies. We found that queen B. impatiens had relatively high rates of overwintering survival after about six months (> 60%), especially when compared to estimates of six-month survival from lab studies (< 10%). We also observed a trend that broadly corroborates many lab studies of bumblebees, in that overwinter survival of queens was related to colony origin. In addition to providing the first estimate of diapause survival for bumblebee queens in nature, our study emphasizes the need to verify patterns observed in the lab to field-based studies. Implications for insect conservation Although protecting target species during sensitive life cycle stages is a fundamental goal of conservation ecology, it is first necessary to identify at what stages of the life cycle populations are most vulnerable. Our results suggest that, at least in some study systems, diapause survival of queen bumblebees in the field may be higher than suggested by lab studies. Supplementary Information The online version contains supplementary material available at 10.1007/s10841-023-00478-8.
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Affiliation(s)
- Genevieve Pugesek
- Department of Entomology, University of Wisconsin-Madison, Madison, WI USA
- Department of Biology, Tufts University, Medford, MA USA
| | | | - Elizabeth E. Crone
- The Department of Evolution and Ecology, Univeristy of California, Davis, CA, USA
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Short CA, Hahn DA. Fat enough for the winter? Does nutritional status affect diapause? JOURNAL OF INSECT PHYSIOLOGY 2023; 145:104488. [PMID: 36717056 DOI: 10.1016/j.jinsphys.2023.104488] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Revised: 01/23/2023] [Accepted: 01/25/2023] [Indexed: 06/18/2023]
Abstract
Many insects enter a dormant state termed diapause in anticipation of seasonal inhospitable conditions. Insects drastically reduce their feeding during diapause. Their reduced nutrient intake is paired with substantial nutrient costs: maintaining basal metabolism during diapause, repairing tissues damaged by adverse conditions, and resuming development after diapause. Many investigators have asked "Does nutrition affect diapause?" In this review, we survey the studies that have attempted to address this question. We propose the term nutritional status, a holistic view of nutrition that explicitly includes the perception, intake, and storage of the great breadth of nutrients. We examine the studies that have sought to test if nutrition affects diapause, trying to identify specific facets of nutritional status that affect diapause phenotypes. Curiously, low quality host plants during the diapause induction phase generally induce diapause, but food deprivation during the same phase generally averts diapause. Using the geometric framework of nutrition to identify specific dietary components that affect diapause may reconcile these contrasting findings. This framework can establish nutritionally permissive space, distinguishing nutrient changes that affect diapause from changes that induce other dormancies. Refeeding is another important experimental technique that distinguishes between diapause and quiescence, a non-diapause dormancy. We also find insufficient evidence for the hypothesis that nutrient stores regulate diapause length and suggest manipulations to investigate the role of nutrient stores in diapause termination. Finally, we propose mechanisms that could interface nutritional status with the diapause program, focusing on combined action of the nutritional axis between the gut, fat body, and brain.
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Affiliation(s)
- Clancy A Short
- Department of Entomology and Nematology, The University of Florida, Gainesville, FL, United States.
| | - Daniel A Hahn
- Department of Entomology and Nematology, The University of Florida, Gainesville, FL, United States
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Huisamen E, Bosua HJ, Karsten M, Terblanche JS. Sub-lethal effects of spinetoram application interacts with temperature in complex ways to influence respiratory metabolism, life history and macronutrient composition in false codling moth (Thaumatotibia leucotreta). JOURNAL OF INSECT PHYSIOLOGY 2023; 145:104490. [PMID: 36773842 DOI: 10.1016/j.jinsphys.2023.104490] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Revised: 01/22/2023] [Accepted: 02/07/2023] [Indexed: 06/18/2023]
Abstract
In many pests, insecticide efficacy is dependent on environmental conditions, including ambient temperature. However, it remains unknown if thermal history alters sub-lethal effects to potentially enhance or reduce pesticide resistance in the false codling moth (FCM), Thaumatotibia leucotreta. Here, using FCM, a pest of economic importance in South Africa infesting several commercial food crops, we report results of sub-lethal exposure to spinetoram, an insecticide that disrupts the nervous system. We investigate whether insecticide efficacy is temperature dependent or perhaps interacts with thermal history by testing the effect of a combination of a sub-lethal dose of spinetoram (4 mg/100 ml) and developmental temperature acclimation (22˚C and 28˚C, i.e., a few degrees above or below optimal development temperatures) on the metabolic rate, life history traits and body composition of FCM in the laboratory. A sub-lethal dose of spinetoram reduced metabolic rate of FCM pupae significantly, led to smaller pupal mass and decreased emergence rates. Additionally, males acclimated at 28 °C had a significantly higher emergence rate compared to males acclimated at 22 °C. Body water, body lipids and body protein reserves of adult FCM tended to be higher in the insecticide treatment compared to the control in the 22 °C acclimation group. In the 28 °C acclimation group, body water, lipids and proteins were lower in the insecticide treatment versus the control. Furthermore, sex influenced both emergence rate and body composition with the direction of change depending on insecticide and temperature treatments. Overall, a sub-lethal dose of spinetoram negatively affects body composition and life history traits but interacts with temperature in complex ways. Therefore, both lethal and sub-lethal effects of spinetoram on FCM, in combination with information on the thermal environment experienced by the pest, should be taken into consideration when pest control decisions are made.
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Affiliation(s)
- Elizabeth Huisamen
- Department of Conservation Ecology and Entomology, Stellenbosch University, South Africa.
| | - Henrika J Bosua
- Department of Conservation Ecology and Entomology, Stellenbosch University, South Africa.
| | - Minette Karsten
- Department of Conservation Ecology and Entomology, Stellenbosch University, South Africa.
| | - John S Terblanche
- Department of Conservation Ecology and Entomology, Stellenbosch University, South Africa.
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Moraiti CA, Verykouki E, Papadopoulos NT. Fitness cost of Rhagoletis cerasi (Diptera: Tephritidae) adults emerged from pupae with different dormancy regimes: the case of prolonged chilling. BULLETIN OF ENTOMOLOGICAL RESEARCH 2023; 113:11-20. [PMID: 36229960 DOI: 10.1017/s0007485321000535] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
The European cherry fruit fly, Rhagoletis cerasi (Diptera: Tephritidae), is a univoltine species that overwinters at pupal stage. Under optimum overwintering conditions pupae will develop into adults the next spring. Shorter or longer than optimum chilling periods induce prolonged pupae dormancy. Pupae that enter prolonged dormancy due to a short chilling period exhibit high emergence rates after a second cycle of cold/warm periods. Adults found to be larger and less fecund compared to their counterparts from pupae with annual diapause. On the other hand, extreme long chilling periods at pupal stage results in high mortality rates. However, for one Greek population, a substantial number of adults emerged following prolonged chilling of pupae (ca. 18 consecutive months). In this study, we used three R. cerasi populations in order to address possible geographical variation in fitness cost of adults from pupae with prolonged dormancy. In addition, the fitness traits of these adults emerging after prolonged pupae chilling were compared with that of their counterparts from pupae with annual diapause or prolonged dormancy. Our results reveal no population-specific variation in fitness cost of adults from pupae with prolonged dormancy. Within a population, lifetime fecundity did not differ between adults emerged from pupae with prolonged dormancy and those emerged after prolonged pupae chilling. Adults emerged from pupae exposed to prolonged chilling suffer an additional reduction in adult longevity compared to adults from pupae with prolonged dormancy. Hence, fitness of R. cerasi adults is regulated by diapause regimes of pupae.
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Affiliation(s)
- Cleopatra A Moraiti
- Laboratory of Entomology and Agricultural Zoology, Department of Agriculture, Crop Production and Rural Environment, University of Thessaly, Fytokou St., N. Ionia Volou, 384 46, Magnesia, Greece
| | - Eleni Verykouki
- Laboratory of Entomology and Agricultural Zoology, Department of Agriculture, Crop Production and Rural Environment, University of Thessaly, Fytokou St., N. Ionia Volou, 384 46, Magnesia, Greece
| | - Nikos T Papadopoulos
- Laboratory of Entomology and Agricultural Zoology, Department of Agriculture, Crop Production and Rural Environment, University of Thessaly, Fytokou St., N. Ionia Volou, 384 46, Magnesia, Greece
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29
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Gourgoulianni N, Schäfer MA, Kapun M, Busso JP, Blanckenhorn WU. Temperature-dependent melanism and phenoloxidase activity in the dimorphic sepsid fly Sepsis thoracica. J Therm Biol 2023; 112:103473. [PMID: 36796918 DOI: 10.1016/j.jtherbio.2023.103473] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2022] [Revised: 12/30/2022] [Accepted: 01/02/2023] [Indexed: 01/13/2023]
Abstract
Climate is changing towards both higher average temperatures and more frequent and severe heat waves. Whereas numerous studies have investigated temperature effects on animal life histories, assessments of their immune function are limited. In the size- and colour-dimorphic black scavenger (or dung) fly Sepsis thoracica (Diptera: Sepsidae), we experimentally studied how developmental temperature and larval density influence phenoloxidase (PO) activity, a key enzyme in insect pigmentation, thermoregulation, and immunity. Flies from five latitudinal European populations were raised at three developmental temperatures (18, 24, 30 °C). PO activity increased with developmental temperature differently in the sexes and the two male morphs (black and orange), altering the sigmoid relationship between melanism, i.e. colouration and fly size. PO activity further positively correlated with larval rearing density, potentially because of higher risks of pathogen infection or greater developmental stress following stronger resource competition. Populations varied somewhat in PO activity, body size and colouration, however with no clear latitudinal pattern. Overall our results indicate that morph- and sex-specific PO activity, and thus likely immune function, in S. thoracica depends on temperature and larval density, modifying the underlying putative trade-off between immunity and body size. The strong dampening of the immune system of all morphs at cool temperatures suggests low-temperature stress in this warm-adapted species common in southern Europe. Our results also support the population density dependent prophylaxis hypothesis, which predicts higher investment in immunity when facing limited resource availability and increased pathogen infection probability.
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Affiliation(s)
- Natalia Gourgoulianni
- Department of Evolutionary Biology & Environmental Studies, University of Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland.
| | - Martin A Schäfer
- Department of Evolutionary Biology & Environmental Studies, University of Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland.
| | - Martin Kapun
- Department of Evolutionary Biology & Environmental Studies, University of Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland; Natural History Museum of Vienna, Austria.
| | - Juan Pablo Busso
- Department of Evolutionary Biology & Environmental Studies, University of Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland.
| | - Wolf U Blanckenhorn
- Department of Evolutionary Biology & Environmental Studies, University of Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland.
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Wolkoff M, Fyie L, Meuti M. Light Pollution Disrupts Seasonal Differences in the Daily Activity and Metabolic Profiles of the Northern House Mosquito, Culex pipiens. INSECTS 2023; 14:64. [PMID: 36661993 PMCID: PMC9865375 DOI: 10.3390/insects14010064] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 12/28/2022] [Accepted: 01/04/2023] [Indexed: 06/17/2023]
Abstract
The Northern House mosquito, Culex pipiens, is an important disease vector, and females are capable of surviving the winter in a state of overwintering diapause. This species' diapause response has been extensively studied, and recent evidence suggests that the circadian clock is involved in measuring seasonal changes in daylength to initiate the diapause response. However, differences in the circadian activity of diapausing and non-diapausing Cx. pipiens have not been thoroughly investigated. Additionally, recent findings indicate that artificial light at night (ALAN) can disrupt mosquito diapause, potentially prolonging the mosquito biting season. We compared the circadian locomotor activity of mosquitoes reared in diapause-averting, long-day conditions and diapause-inducing, short-day conditions with and without ALAN to elucidate the interplay between circadian activity, diapause, and light pollution. We also uncovered metabolic differences between mosquitoes reared under diapausing and non-diapausing photoperiods with and without ALAN by measuring the concentration of protein, fructose, glycogen, water-soluble carbohydrates, and lipids. We found that ALAN exposure altered several diapause-associated phenotypes including slightly, but not significantly, increasing activity levels in short day-reared mosquitoes; and preventing some short day-reared mosquitoes from accumulating lipids. ALAN also significantly reduced glycogen and water-soluble carbohydrate levels in long day-reared mosquitoes. Based on our findings, light pollution may decrease insect fitness by perturbing metabolism, and may also impact several phenotypes associated with insect diapause, potentially extending the mosquito biting season and preventing insects in urban environments from overwintering successfully.
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Li X, Ma W, Jiang Y. Honeybees (Hymenoptera: Apidae) Adapt to the Shock of High Temperature and High Humidity Through Changes in Sugars and Polyols and Free Amino Acids. JOURNAL OF INSECT SCIENCE (ONLINE) 2023; 23:4. [PMID: 36695003 PMCID: PMC9874260 DOI: 10.1093/jisesa/iead002] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Indexed: 06/17/2023]
Abstract
Temperature and humidity are important factors affecting the honeybees physiological metabolism. When honeybees are stressed by high temperature and high humidity, various physiological stress mechanisms evolved by bees are activated in response to injury. The accumulation of some sugars, polyols, and free amino acids can effectively protect cell structure stability and resist temperature stress. In this study, the changes of glucose, trehalose, cholesterol, sorbitol, sorbitol dehydrogenase, mannitol, and free amino acids content of worker honeybees [Apis cerana cerana Fabricius and Apis mellifera Ligustica (Hymenoptera: Apidae)] under different temperature and humidity conditions were measured. Our research results show that high temperature has an important impact on the metabolism of honeybees. Heat stress can cause the accumulation of various antistress substances in worker. The contents of sugars, polyols, and some free amino acids accumulated in high temperature were significantly higher than those in the control, while the influence of high humidity was less. Although high humidity was improved compared with the control, the difference was not obvious. It provides a theoretical basis for exploring the physiological mechanism of individual heat resistance of honeybees.
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Affiliation(s)
- Xinyu Li
- Shandong Vocational College of Light Industry, Zibo, Shandong Province, China
| | - Weihua Ma
- College of Horticulture, Shanxi Agricultural University, Taiyuan, Shanxi Province, China
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32
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Glądalski M, Podstawczyńska A, Bańbura M, Kaliński A, Markowski M, Wawrzyniak J, Mańkowska D, Zieliński P, Znajewska A, Skwarska J, Bańbura J. Effect of extreme weather on the breeding parameters of great tits Parus major: comparison of two very different seasons. THE EUROPEAN ZOOLOGICAL JOURNAL 2022. [DOI: 10.1080/24750263.2022.2099990] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022] Open
Affiliation(s)
- M. Glądalski
- Department of Experimental Zoology and Evolutionary Biology, Faculty of Biology and Environmental Protection, University of Lodz, Łódź, Poland
| | - A. Podstawczyńska
- Department of Meteorology and Climatology, Faculty of Geographical Sciences, University of Lodz, Łódź, Poland
| | - M. Bańbura
- Museum of Natural History, Faculty of Biology and Environmental Protection, University of Lodz, Łódź, Poland
| | - A. Kaliński
- Department of Experimental Zoology and Evolutionary Biology, Faculty of Biology and Environmental Protection, University of Lodz, Łódź, Poland
| | - M. Markowski
- Department of Experimental Zoology and Evolutionary Biology, Faculty of Biology and Environmental Protection, University of Lodz, Łódź, Poland
| | - J. Wawrzyniak
- Department of Experimental Zoology and Evolutionary Biology, Faculty of Biology and Environmental Protection, University of Lodz, Łódź, Poland
| | - D. Mańkowska
- Łódź Botanical Garden, Urban Greenery Management, Łódź, Poland
| | - P. Zieliński
- Department of Ecology and Vertebrate Zoology, Faculty of Biology and Environmental Protection, University of Lodz, Łódź, Poland
| | | | - J. Skwarska
- Department of Experimental Zoology and Evolutionary Biology, Faculty of Biology and Environmental Protection, University of Lodz, Łódź, Poland
| | - J. Bańbura
- Department of Experimental Zoology and Evolutionary Biology, Faculty of Biology and Environmental Protection, University of Lodz, Łódź, Poland
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33
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Hasan MM, Hasan MM, Rahman ASMS, Athanassiou CG, Tussey DA, Hahn DA. Induced dormancy in Indian meal moth Plodia interpunctella (Hübner) and its impact on the quality improvement for mass rearing in parasitoid Habrobracon hebetor (Say). BULLETIN OF ENTOMOLOGICAL RESEARCH 2022; 112:766-776. [PMID: 36193680 DOI: 10.1017/s0007485322000153] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
A steady supply of hosts at the susceptible stage for parasitism is a major component of mass rearing parasitoids for biological control programs. Here we describe the effects of storing 5th instar Plodia interpunctella larvae in dormancy on subsequent host development in the context of host colony maintenance and effects of the duration of host dormancy on the development of Habrobracon hebetor parasitoids reared from dormant hosts. We induced dormancy with a combination of short daylength (12L:12D) and lower temperature (15°C), conditions known to induce diapause in this species, and held 5th instar larvae of P. interpunctella for a series of dormancy durations ranging from 15 to 105 days. Extended storage of dormant 5th instar larvae had no significant impacts on survival, development, or reproductive potential of P. interpunctella, reinforcing that dormant hosts have a substantial shelf life. This ability to store hosts in dormancy for more than 3 months at a time without strong negative consequences reinforces the promise of using dormancy to maintain host colonies. The proportion of hosts parasitized by H. hebetor did not vary significantly between non-dormant host larvae and dormant host larvae stored for periods as long as 105 days. Concordant with a prior study, H. hebetor adult progeny production from dormant host larvae was higher than the number of progeny produced on non-dormant host larvae. There were no differences in size, sex ratio, or reproductive output of parasitoids reared on dormant hosts compared to non-dormant hosts stored for up to 105 days. Larval development times of H. hebetor were however longer when reared on dormant hosts compared to non-dormant hosts. Our results agree with other studies showing using dormant hosts can improve parasitoid mass rearing, and we show benefits for parasitoid rearing even after 3 months of host dormancy.
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Affiliation(s)
- Md Mahbub Hasan
- Department of Zoology, Rajshahi University, Rajshahi 6205, Bangladesh
| | - Md Mehedi Hasan
- Department of Crop Science and Technology, Rajshahi University, Rajshahi 6205, Bangladesh
| | | | - Christos G Athanassiou
- Laboratory of Entomology and Agricultural Zoology, Department of Agriculture, Crop Production and Rural Environment, University of Thessaly, Phytokou str. 38446, N. Ionia Magnesia, Greece
| | - Dylan A Tussey
- Department of Entomology and Nematology, University of Florida, Gainesville, Florida 32611, USA
| | - Daniel A Hahn
- Department of Entomology and Nematology, University of Florida, Gainesville, Florida 32611, USA
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Park MG, Delphia CM, Prince C, Yocum GD, Rinehart JP, O’Neill KM, Burkle LA, Bowsher JH, Greenlee KJ. Effects of Temperature and Wildflower Strips on Survival and Macronutrient Stores of the Alfalfa Leafcutting Bee (Hymenoptera: Megachilidae) Under Extended Cold Storage. ENVIRONMENTAL ENTOMOLOGY 2022; 51:958-968. [PMID: 35964238 PMCID: PMC9585370 DOI: 10.1093/ee/nvac062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Indexed: 06/15/2023]
Abstract
Megachile rotundata (F.) is an important pollinator of alfalfa in the United States. Enhancing landscapes with wildflowers is a primary strategy for conserving pollinators and may improve the sustainability of M. rotundata. Changing cold storage temperatures from a traditionally static thermal regime (STR) to a fluctuating thermal regime (FTR) improves overwintering success and extends M. rotundata's shelf life and pollination window. Whether floral resources enhance overwintering survival and/or interact with a thermal regime are unknown. We tested the combined effects of enhancing alfalfa fields with wildflowers and thermal regime on survival and macronutrient stores under extended cold storage (i.e., beyond one season). Megachile rotundata adults were released in alfalfa plots with and without wildflower strips. Completed nests were harvested in September and stored in STR. After a year, cells were randomly assigned to remain in STR for 6 months or in FTR for a year of extended cold storage; emergence rates were observed monthly. Macronutrient levels of emerged females were assessed. FTR improved M. rotundata survival but there was no measurable effect of wildflower strips on overwintering success or nutrient stores. Timing of nest establishment emerged as a key factor: offspring produced late in the season had lower winter survival and dry body mass. Sugars and glycogen stores increased under FTR but not STR. Trehalose levels were similar across treatments. Total lipid stores depleted faster under FTR. While wildflowers did not improve M. rotundata survival, our findings provide mechanistic insight into benefits and potential costs of FTR for this important pollinator.
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Affiliation(s)
| | - Casey M Delphia
- Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT, USA
- Montana Entomology Collection, Marsh Labs, Montana State University, Bozeman, MT, USA
| | - Cassandra Prince
- Edward T. Schafer Agricultural Research Center, Biosciences Research Laboratory, Fargo, ND, USA
| | - George D Yocum
- Edward T. Schafer Agricultural Research Center, Biosciences Research Laboratory, Fargo, ND, USA
| | - Joseph P Rinehart
- Edward T. Schafer Agricultural Research Center, Biosciences Research Laboratory, Fargo, ND, USA
| | - Kevin M O’Neill
- Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT, USA
| | - Laura A Burkle
- Department of Ecology, Montana State University, Bozeman, MT, USA
| | - Julia H Bowsher
- Department of Biological Sciences, North Dakota State University, Fargo, ND, USA
| | - Kendra J Greenlee
- Department of Biological Sciences, North Dakota State University, Fargo, ND, USA
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35
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Homayoonzadeh M, Michaud JP, Esmaeily M, Talebi K, Allahyari H, Wright DJ. Physiological Differences Between Seasonal Dimorphs of Agonoscena pistaciae (Hemiptera: Aphalaridae) Elicit Distinct Host Plant Responses, Informing Novel Pest Management Insights. ENVIRONMENTAL ENTOMOLOGY 2022; 51:969-979. [PMID: 36029067 DOI: 10.1093/ee/nvac066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Indexed: 06/15/2023]
Abstract
We examined differences in the physiology and life history between dimorphs of the common pistachio psyllid, Agonoscena pistaciae (Burckhardt and Lauterer) (Hemiptera: Aphalaridae), and how they differ in elicitating host plant production of key metabolites and volatile compounds involved in the recruitment of herbivores and natural enemies. Summer morphs had higher activities of glutathione S-transferase, carboxylesterase, acetylcholinesterase, and cytochrome P450 monooxygenase, superoxide dismutase, catalase, peroxidase, phenoloxidase, and a higher total protein content compared to winter morphs, whereas the latter had higher amounts of lipid, carbohydrate, and glycogen. Winter morphs were heavier, with a higher chitin content and longer preoviposition period, but greater fecundity and longevity than summer morphs. A lower LC50 to thiamethoxam for winter morphs resulted in higher mortality following exposure to the recommended rate of this insecticide in a greenhouse trial. Feeding by winter morphs elicited more strongly the release of volatile compounds known to be attractive to other herbivores, whereas feeding by summer morphs elicited more strongly the release of volatiles implicated in the attraction of natural enemies. Feeding by psyllids increased the concentrations of nitrogenous compounds, carbohydrates, vitamins, and amino acids in plants, the winter morph eliciting larger changes and more improved host plant quality. We conclude that winter morphs are more vulnerable targets for chemical control in early spring, whereas management of summer morphs could rely more on conservation biological control.
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Affiliation(s)
- Mohammad Homayoonzadeh
- Department of Plant Protection, College of Agriculture and Natural Resources, University of Tehran, 31587-77871, Karaj, Iran
| | - J P Michaud
- Department of Entomology, Agricultural Research Center-Hays, Kansas State University, Hays, KS 67601, USA
| | - Mojtaba Esmaeily
- Department of Plant Protection, College of Agriculture and Natural Resources, University of Tehran, 31587-77871, Karaj, Iran
| | - Khalil Talebi
- Department of Plant Protection, College of Agriculture and Natural Resources, University of Tehran, 31587-77871, Karaj, Iran
| | - Hossein Allahyari
- Department of Plant Protection, College of Agriculture and Natural Resources, University of Tehran, 31587-77871, Karaj, Iran
| | - Denis J Wright
- Department of Life Sciences, Imperial College London, Silwood Park Campus, Ascot, Berkshire SL5 7PY, UK
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Zhao L, Wang X, Liu Z, Torson AS. Energy Consumption and Cold Hardiness of Diapausing Fall Webworm Pupae. INSECTS 2022; 13:853. [PMID: 36135554 PMCID: PMC9505466 DOI: 10.3390/insects13090853] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Revised: 09/11/2022] [Accepted: 09/12/2022] [Indexed: 06/16/2023]
Abstract
Diapause and cold hardiness are essential components of winter survival for most insects in temperate zones. The fall webworm, Hyphantria cunea, overwinters in a pupal diapause. In this study, we investigated the energy consumption and cold hardiness of diapausing pupae. We found that lipid content decreased from October to November and stabilized from November to March. Glycogen content decreased by 61.3% and 52.2% for females and males, respectively, from October to November, and decreased slowly from November to March. We also observed a significant increase in trehalose concentrations as ambient temperatures decreased from October to November and a decrease in trehalose as temperatures increased again in March. We did not observe substantial changes in pupal supercooling points among the dates sampled. In addition, prolonged pupal development time reduced their survival rate and had no significant effect on post-diapause adult body mass and fecundity but reduced egg diameter in females. These results suggest that the energy consumption of H. cunea pupae during early diapause depends on lipid and glycogen, while it shifts to depend on glycogen or other energy stores in the mid- and late diapause stages. Our results also suggest that the prolonged development time of diapausing pupae had a negative effect on post-diapause fitness.
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Affiliation(s)
- Lvquan Zhao
- Co-Innovation Center for Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing 210037, China; (X.W.); (Z.L.)
| | - Xinmei Wang
- Co-Innovation Center for Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing 210037, China; (X.W.); (Z.L.)
| | - Zheng Liu
- Co-Innovation Center for Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing 210037, China; (X.W.); (Z.L.)
| | - Alex S. Torson
- USDA-ARS Edward T. Schafer Agricultural Research Center, Biosciences Research Laboratory, Fargo, ND 58102, USA;
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Neven LG, Yee WL. Metabolic reserves of diapausing western cherry fruit fly (Diptera: Tephritidae) pupae in relation to chill duration and post-chill rearing conditions. FRONTIERS IN INSECT SCIENCE 2022; 2:989673. [PMID: 38468813 PMCID: PMC10926375 DOI: 10.3389/finsc.2022.989673] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Accepted: 08/30/2022] [Indexed: 03/13/2024]
Abstract
How different macronutrients are utilized at various stages of pupal diapause and the effects of winter length on nutrient reserves remain poorly studied for most insects. Western cherry fruit fly, Rhagoletis indifferens (Diptera: Tephritidae), is a specialist on cherries in higher latitudes or elevations in western North America that exhibits a obligate pupal diapause requiring chilling before adult development can occur. We determined the relationship between metabolic reserves and diapause status in R. indifferens pupae, testing the hypotheses that lipids are the primary reserves utilized during diapause and that long periods of warmth deplete these reserves more than periods of cold. Effects of 0- to 20-week durations at 3°C and subsequent exposure to 23°C and 16:8 L:D (warm rearing conditions) for 0 to 7 weeks on lipid, protein, soluble carbohydrates, and glycogen reserves of R. indifferens pupae were determined. During diapause, lipid reserves were the primary source of energy utilized by R. indifferens, while protein and soluble carbohydrates levels were stable throughout diapause and thus less utilized. At post-diapause, glycogen levels fluctuated the most, indicating that lipid reserves were utilized to produce glycogen to support metabolism for adult fly development. Unchilled pupae did not deplete lipid reserves, unlike chilled pupae, likely because unchilled pupae remained in diapause. Rhagoletis indifferens may have evolved a nutrient utilization strategy typical of rigid diapausing insects in higher latitude environments.
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Affiliation(s)
- Lisa G. Neven
- United States Department of Agriculture, Agricultural Research Service (USDA-ARS), Temperate Tree Fruit and Vegetable Research Unit, Wapato, WA, United States
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Highly Efficient Use of Infrared Spectroscopy (ATR-FTIR) to Identify Aphid Species. BIOLOGY 2022; 11:biology11081232. [PMID: 36009859 PMCID: PMC9404783 DOI: 10.3390/biology11081232] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/25/2022] [Revised: 08/09/2022] [Accepted: 08/15/2022] [Indexed: 11/16/2022]
Abstract
Aphids are commonly considered to be serious pests for trees, herbaceous and cultivated plants. Recognition and identification of individual species is very difficult and is based mainly on morphological features. The aims of the study were to suggest the possibility of identifying aphids through the use of Fourier-transform infrared (FTIR) spectroscopy, and to determine which absorption peaks are the most useful to separate aphid species. Using FTIR spectroscopy, based on the chemical composition of the body, we were able to distinguish 12 species of aphid. We have shown that using nine distinct peaks corresponding to the molecular vibrations from carbohydrates, lipids, amides I and II, it is possible to accurately identify aphid species with an efficiency of 98%.
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Reversible mitophagy drives metabolic suppression in diapausing beetles. Proc Natl Acad Sci U S A 2022; 119:e2201089119. [PMID: 35858446 PMCID: PMC9335217 DOI: 10.1073/pnas.2201089119] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Many insects enter a state of dormancy (diapause) during winter in which they lower their metabolism to save energy. Metabolic suppression is a hallmark of diapause, yet we know little about the mechanisms underpinning metabolic suppression in winter or how it is reversed in the spring. Here, we show that metabolic suppression in dormant Colorado potato beetles results from the breakdown of flight muscle mitochondria via mitophagy. Diapausing Colorado potato beetles suppress their metabolism by 90%, and this lowered metabolic rate coincides with a similar reduction in flight muscle mitochondrial function and density. During early diapause, beetles increase the expression of mitophagy-related transcripts (Parkin and ATG5) in their flight muscle coincident with an increase in mitophagy-related structures in the flight muscle. Knocking down Parkin expression with RNA interference in diapausing beetles prevented some mitochondrial breakdown and partially restored the whole animal metabolic rate, suggesting that metabolic suppression in diapausing beetles is driven by mitophagy. In other animals and in models of disease, such large-scale mitochondrial degradation is irreversible. However, we show that as diapause ends, beetles reverse mitophagy and increase the expression of PGC1α and NRF1 to replenish flight muscle mitochondrial pools. This mitochondrial biogenesis is activated in anticipation of diapause termination and in the absence of external stimuli. Our study provides a mechanistic link between mitochondrial degradation in insect tissues over the winter and whole-animal metabolic suppression.
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40
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Liu Q, Luo D, Wang M, Song X, Ye X, Jashenko R, Ji R. Transcriptome analysis of the response to low temperature acclimation in Calliptamus italicus eggs. BMC Genomics 2022; 23:482. [PMID: 35778687 PMCID: PMC9248191 DOI: 10.1186/s12864-022-08705-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2022] [Accepted: 06/08/2022] [Indexed: 12/03/2022] Open
Abstract
Background Calliptamus italicus is a dominant species in the desert and semi-desert grassland. It is widely distributed throughout many regions such as Asia, Europe, North Africa and the Mediterranean, and has enormous destructive potential for agriculture and animal husbandry. The C. italicus overwintering as eggs in the soil through diapause, and the cold tolerance of locust eggs is the key to their ability to survive the winter smoothly to maintain the population. Results Transcriptome analysis of C. italicus eggs was carried out in this paper in constant low temperature acclimation, natural low temperature acclimation and room temperature. The differentially expressed genes related to cold tolerance were screened out, the differences in expression patterns under different low temperature acclimation were analyzed, and the genes in the significantly up-regulated pathways may play an important role in cold tolerance. The results show that different domestication modes can induce C. italicus eggs to express a large number of genes to alleviate low temperature damage, but C. italicus eggs are more sensitive to changes in temperature. Compared with the control, there are 8689 DEGs at constant low temperature and 14,994 DEGs at natural low temperature. KEGG analysis showed that DEGs were mainly enriched in pathways related to metabolism and biological systems under constant low temperature, and were mainly enriched in pathways related to biological systems and environmental information processing under natural low temperature. In addition, RNAi technology was used to further verify the regulation of genes in the significantly enriched up-regulated pathways on C. italicus eggs, and it was confirmed that the hatching rate of C. italicus eggs at low temperature was significantly reduced after interference. Conclusions Transcriptome analysis of C. italicus eggs treated at different temperatures provided a theoretical basis for further understanding the adaptation mechanism of C. italicus eggs to low temperature. In addition, four potential RNAi target genes were verified in the eggs of C. italicus for the first time, providing new ideas for effective control of this species. Supplementary Information The online version contains supplementary material available at 10.1186/s12864-022-08705-3.
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Affiliation(s)
- Qian Liu
- International Center for the Collaborative Management of Cross-border Pest in Central Asia, Xinjiang Key Laboratory of Special Species Conservation and Regulatory Biology, Xinjiang Normal University, Urumqi, 830054, China
| | - Di Luo
- International Center for the Collaborative Management of Cross-border Pest in Central Asia, Xinjiang Key Laboratory of Special Species Conservation and Regulatory Biology, Xinjiang Normal University, Urumqi, 830054, China
| | - Mengjia Wang
- International Center for the Collaborative Management of Cross-border Pest in Central Asia, Xinjiang Key Laboratory of Special Species Conservation and Regulatory Biology, Xinjiang Normal University, Urumqi, 830054, China
| | - Xingmin Song
- International Center for the Collaborative Management of Cross-border Pest in Central Asia, Xinjiang Key Laboratory of Special Species Conservation and Regulatory Biology, Xinjiang Normal University, Urumqi, 830054, China
| | - Xiaofang Ye
- International Center for the Collaborative Management of Cross-border Pest in Central Asia, Xinjiang Key Laboratory of Special Species Conservation and Regulatory Biology, Xinjiang Normal University, Urumqi, 830054, China
| | - Roman Jashenko
- Al-Farabi Kazakh National University, Almaty, Kazakhstan, 050038
| | - Rong Ji
- International Center for the Collaborative Management of Cross-border Pest in Central Asia, Xinjiang Key Laboratory of Special Species Conservation and Regulatory Biology, Xinjiang Normal University, Urumqi, 830054, China.
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Using Autumnal Trap Crops to Manage Tarnished Plant Bugs (Lygus lineolaris). INSECTS 2022; 13:insects13050441. [PMID: 35621777 PMCID: PMC9146492 DOI: 10.3390/insects13050441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Revised: 04/27/2022] [Accepted: 05/05/2022] [Indexed: 12/02/2022]
Abstract
Simple Summary The tarnished plant bug Lygus lineolaris (Hemiptera: Miridae) is an important pest in several cultures. Trap crops are useful during the production season but could also contribute to the preventive regulation of L. lineolaris in autumn. The study aimed to test the attractiveness of the mullein plant as an autumnal trap crop and three repressive methods applied to this host. During autumn, mullein plants are a very attractive trap crop resulting in an aggregation of the L. lineolaris. Application of insecticide of the autumnal trap crop reduced winter survivorship of the pest. The combination of autumnal trap crop and insecticide is a promising strategy that could contribute to reducing L. lineolaris population during the following growing season. Abstract For insects, surviving winter depends on their capacity to store enough energy and find proper hibernation sites. A common strategy is to minimize movement and hibernate near autumn food sources. We investigated the efficiency of autumnal hosts to act as trap crops where insects could be exposed to targeted repressive treatments. This approach could reduce the local populations of insect pests in the next production season, reducing the need for insecticides. First, we tested the mullein plant’s attractiveness as an autumn trap crop for Lygus lineolaris (Hemiptera: Miridae) in strawberry fields by comparing peak population density among mullein (Verbascum thapsus), strawberry plants (Fragaria × ananassa), buckwheat (Fagopyrum esculentum), and mustard (Sinapis alba). Second, we tested four treatments applied to the autumn trap crops to reduce L. lineolaris winter survivorship: (1) hot water, (2) a pathogen (Beauveria bassiana), (3) insecticide (cypermethrin), and (4) a control. The density of the L. lineolaris population on mullein in autumn and on buckwheat in summer was higher than on strawberry and mustard. Of the overwintering L. lineolaris, 0% survived the winter when treated with the insecticide cypermethrin, while 38.3% survived in the control treatment (without repressive treatment). The B. bassiana and hot water treatments did not differ from the control. The mullein autumn trap crops combined with insecticide treatments could contribute to reducing the overwintering population, hence potentially reducing population during the following growing season.
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Li H, Xia X, He X, Li S, Dai L, Ye J, Hao D. Comparative Transcriptome Analysis Reveals Molecular Insights in Overwintering Monochamus alternatus (Coleoptera: Cerambycidae). JOURNAL OF INSECT SCIENCE (ONLINE) 2022; 22:8. [PMID: 35560005 PMCID: PMC9105011 DOI: 10.1093/jisesa/ieac025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Indexed: 06/15/2023]
Abstract
Monochamus alternatus, the dominant vector of Bursaphelenchus xylophilus (Aphelenchida: Aphelenchoididae), has caused immense damage to forest resources. In China, this vector was native to the southern regions but has spread northward recently. To adapt to more challenging environments in the northern winter, M. alternatus has evolved an intricate strategy for overwintering, which remains largely unknown. Herein, we compared the transcriptome data of the overwintering and non-overwintering larvae of M. alternatus larvae to investigate the molecular mechanisms in overwintering. A total of 53.10 GB clean bases and 28, 245 unigenes were obtained by RNA-seq. Analysis of 2597 upregulated and 2429 downregulated unigenes, as well as the enrichment of DEGs showed that many genes and pathways were jointly involved in the overwintering period. Besides, the accuracy of the RNA-seq data was tested by using qPCR experiment involving 13 selected genes. The results revealed that the overwintering process relied largely on the energy allocation trade-off. Specifically, overwintering M. alternatus inhibited energy-intensive activities, such as growth and molting, detoxification, and trehalose transport, and the reserved energy was skewed towards the synthesis of antifreeze compounds and immune response to cope with the deleterious effects of winter.
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Affiliation(s)
- Hui Li
- Co-Innovation Center for the Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037, China
- College of Forestry, Nanjing Forestry University, Nanjing, China
| | - Xiaohong Xia
- Co-Innovation Center for the Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037, China
- College of Forestry, Nanjing Forestry University, Nanjing, China
| | - Xuanyu He
- Co-Innovation Center for the Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037, China
- College of Forestry, Nanjing Forestry University, Nanjing, China
| | - Shouyin Li
- Co-Innovation Center for the Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037, China
- College of Forestry, Nanjing Forestry University, Nanjing, China
| | - Lulu Dai
- Co-Innovation Center for the Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037, China
- College of Forestry, Nanjing Forestry University, Nanjing, China
| | - Jianren Ye
- Co-Innovation Center for the Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037, China
- College of Forestry, Nanjing Forestry University, Nanjing, China
| | - Dejun Hao
- Co-Innovation Center for the Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037, China
- College of Forestry, Nanjing Forestry University, Nanjing, China
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Huey RB, Buckley LB. Designing a Seasonal Acclimation Study Presents Challenges and Opportunities. Integr Org Biol 2022; 4:obac016. [PMID: 35692903 PMCID: PMC9175191 DOI: 10.1093/iob/obac016] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Organisms living in seasonal environments often adjust physiological capacities and sensitivities in response to (or in anticipation of) environment shifts. Such physiological and morphological adjustments (“acclimation” and related terms) inspire opportunities to explore the mechanistic bases underlying these adjustments, to detect cues inducing adjustments, and to elucidate their ecological and evolutionary consequences. Seasonal adjustments (“seasonal acclimation”) can be detected either by measuring physiological capacities and sensitivities of organisms retrieved directly from nature (or outdoor enclosures) in different seasons or less directly by rearing and measuring organisms maintained in the laboratory under conditions that attempt to mimic or track natural ones. But mimicking natural conditions in the laboratory is challenging—doing so requires prior natural-history knowledge of ecologically relevant body temperature cycles, photoperiods, food rations, social environments, among other variables. We argue that traditional laboratory-based conditions usually fail to approximate natural seasonal conditions (temperature, photoperiod, food, “lockdown”). Consequently, whether the resulting acclimation shifts correctly approximate those in nature is uncertain, and sometimes is dubious. We argue that background natural history information provides opportunities to design acclimation protocols that are not only more ecologically relevant, but also serve as templates for testing the validity of traditional protocols. Finally, we suggest several best practices to help enhance ecological realism.
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Affiliation(s)
- Raymond B Huey
- Department of Biology, University of Washington, Seattle, WA, USA
| | - Lauren B Buckley
- Department of Biology, University of Washington, Seattle, WA, USA
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Nielsen ME, Lehmann P, Gotthard K. Longer and warmer prewinter periods reduce post‐winter fitness in a diapausing insect. Funct Ecol 2022. [DOI: 10.1111/1365-2435.14037] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Philipp Lehmann
- Department of Zoology Stockholm University Stockholm Sweden
- Zoological Institute and Museum Greifswald University Greifswald Germany
| | - Karl Gotthard
- Department of Zoology Stockholm University Stockholm Sweden
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Knapp M, Řeřicha M, Haelewaters D, González E. Fungal ectoparasites increase winter mortality of ladybird hosts despite limited effects on their immune system. Proc Biol Sci 2022; 289:20212538. [PMID: 35317669 PMCID: PMC8941424 DOI: 10.1098/rspb.2021.2538] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Winter represents a challenging period for insects inhabiting temperate regions. A plethora of studies have investigated how environmental conditions such as temperature affect insect overwintering success. However, only a few studies have focused on biotic factors and the mechanisms affecting the overwintering performance of insects. Here, we investigated the effects of the parasitic fungus Hesperomyces virescens on the overwintering performance and immune system functioning of the invasive ladybird Harmonia axyridis. Winter survival was significantly lower for infected than for uninfected ladybirds. Body mass loss during overwintering tends to be higher for infected individuals compared to uninfected ones and for larger ladybirds. In addition, parasitic infection reduced post-winter longevity without food in male but not female ladybirds. Total haemocyte and protein concentration as well as antimicrobial activity against Escherichia coli significantly decreased during ladybird overwintering. However, haemolymph parameters were only poorly affected by Hesperomyces infection, with the exception of antimicrobial activity against E. coli that tended to be higher in infected ladybirds. Interestingly, none of the pre-winter haemolymph parameters were good predictors of ladybird winter survival. Overall, our results indicate that energy exhaustion unrelated to immune system challenge is the most probable explanation for increased overwintering mortality in infected ladybirds.
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Affiliation(s)
- Michal Knapp
- Department of Ecology, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Kamýcká 129, 165 00 Prague - Suchdol, Czech Republic
| | - Michal Řeřicha
- Department of Ecology, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Kamýcká 129, 165 00 Prague - Suchdol, Czech Republic
| | - Danny Haelewaters
- Research Group Mycology, Department of Biology, Ghent University, K.L. Ledeganckstraat 35, 9000 Ghent, Belgium
| | - Ezequiel González
- Department of Ecology, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Kamýcká 129, 165 00 Prague - Suchdol, Czech Republic,Instituto Multidisciplinario de Biología Vegetal (IMBIV)- Universidad Nacional de Córdoba (UNC)- CONICET, Centro de Investigaciones Entomológicas de Córdoba FCEFyN, Av. Vélez Sarsfield 1611, X5016GCA Córdoba, Argentina
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Häner N, Amiresmaeili N, Stähli N, Romeis J, Collatz J. Overwintering of two pupal parasitoids of Drosophila under natural conditions. J Therm Biol 2022; 106:103231. [DOI: 10.1016/j.jtherbio.2022.103231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 03/10/2022] [Accepted: 03/26/2022] [Indexed: 10/18/2022]
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Jacquier L, Doums C, Molet M. Spring colonies of the ant Temnothorax nylanderi tolerate cadmium better than winter colonies, in both a city and a forest habitat. ECOTOXICOLOGY (LONDON, ENGLAND) 2022; 31:324-334. [PMID: 34994914 DOI: 10.1007/s10646-021-02515-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 12/11/2021] [Indexed: 06/14/2023]
Abstract
A recent study showed that, in the ant Temnothorax nylanderi, city colonies are more tolerant to cadmium than forest colonies. However, because of annual variation in biological factors (e.g. body size, anti-stress protein production or trace metal accumulation rate), trace metal tolerance may vary over the year. We aimed at testing whether tolerance to cadmium of colonies of T. nylanderi differs between two different seasons within the same year (winter and spring). We also assessed whether the better cadmium tolerance of city colonies was constant over these two different time points. We collected colonies at the end of their hibernation period (winter colonies) and several weeks after (spring colonies) from two different habitats (forest and city) to assess whether response to cadmium was consistent regardless of the environment. We exposed colonies to a cadmium or a control treatment for 61 days. We compared tolerance to cadmium between spring/winter and city/forest colonies by measuring several life history traits. We found that spring colonies tolerates cadmium better than winter colonies, and that city colonies have a higher tolerance to cadmium but only in spring. Although further studies with replicated pairs of city/forest habitats and different years will be necessary to confirm those results, our study suggests that tolerance to trace metals can fluctuate along the yearly cycle.
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Affiliation(s)
- L Jacquier
- Sorbonne Université, UPEC, CNRS, IRD, INRA, Institute of Ecology and Environmental Sciences of Paris, IEES-Paris, F-75005, Paris, France.
| | - C Doums
- Institut de Systématique, Evolution, Biodiversité (ISYEB), Muséum national d'Histoire naturelle, CNRS, Sorbonne Université, EPHE, Université des Antilles, 75005, Paris, France
- EPHE, PSL University, 75014, Paris, France
| | - M Molet
- Sorbonne Université, UPEC, CNRS, IRD, INRA, Institute of Ecology and Environmental Sciences of Paris, IEES-Paris, F-75005, Paris, France
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Szejner-Sigal A, Williams CM. Aggregations reduce winter metabolic rates in the diapausing ladybeetle Hippodamia convergens. JOURNAL OF INSECT PHYSIOLOGY 2022; 137:104357. [PMID: 35026302 DOI: 10.1016/j.jinsphys.2022.104357] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2021] [Revised: 12/27/2021] [Accepted: 01/07/2022] [Indexed: 06/14/2023]
Abstract
Energy conservation is linked to survival and fitness of overwintering ectotherms, and is particularly critical in winter. Although many insects overwinter individually, some form aggregations with conspecifics. Aggregations cause metabolic suppression in some insects, but the effect of aggregations on metabolic rates and energy use in overwintering aggregations remains underexplored. The convergent ladybeetle (Hippodamia convergens) overwinters in massive aggregations, making it an ideal system for testing the effect of aggregation size on metabolic rates in overwintering insects. We measured metabolic rates of beetle aggregations of 1, 10, 25, and 50 individuals using stop-flow respirometry across two ecologically relevant temperatures, and measured locomotor activity as one possible driver of group effects on metabolic rate. Metabolic rates per beetle decreased with increasing aggregation size at both temperatures, but was more pronounced at low temperatures. Metabolic rates scaled hypometrically with mass, with deeper response at cool temperatures. Activity decreased with aggregation size, but only at low temperatures. These results suggest that individuals within aggregations enter a deeper metabolically inactive state that single individual beetles cannot achieve, which is partly but not completely explained by a reduction in locomotor activity. This group strategy for energy conservation may provide an additional selective advantage for the evolution of large overwintering aggregations.
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Affiliation(s)
- Andre Szejner-Sigal
- Department of Integrative Biology, University of California, Berkeley, CA, USA.
| | - Caroline M Williams
- Department of Integrative Biology, University of California, Berkeley, CA, USA
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Metabolic Response of Aphid Cinara tujafilina to Cold Stress. BIOLOGY 2021; 10:biology10121288. [PMID: 34943203 PMCID: PMC8698524 DOI: 10.3390/biology10121288] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Revised: 12/02/2021] [Accepted: 12/04/2021] [Indexed: 01/23/2023]
Abstract
Climate changes enable thermophilic insect species to expand their ranges, but also force them to adapt to unfavourable environmental conditions in new habitats. Focusing on Cinara tujafilina, we investigated the metabolic changes in the body of the aphid that enabled it to survive the low temperatures of winter. Using GC–MS analysis, differences in the chemical composition of the aphids in summer and winter were found. The metabolic changes were mainly related to the increased activity of the pathways of carbohydrate metabolism, such as glycolysis and the pentose phosphate pathway; a decrease in tricarboxylic acid cycle (TCA); accumulation of polyols; and increased levels of proline, tyrosine, and fatty acids.
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Bodner L, Bouchebti S, Levin E. Allocation and metabolism of naturally occurring dietary amino acids in the Oriental hornet. INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY 2021; 139:103675. [PMID: 34744018 DOI: 10.1016/j.ibmb.2021.103675] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 10/12/2021] [Accepted: 10/26/2021] [Indexed: 06/13/2023]
Abstract
Oriental hornet (Vespa orientalis) foragers are strong, long-distance flyers exhibiting a high metabolic rate. Accordingly, they feed on carbohydrate-rich diets, such as floral nectar and larval secretions. These nutritional sources, in addition to carbohydrates, also contain free amino acids (AAs). Leucine, glycine, and proline are three common AAs in the diet of social wasps. Using diets enriched with carbon-specific (13C1) isotopically labeled leucine, glycine, and proline, and a cavity ring-down spectroscope (CRDS) stable carbon isotope analyzer, we examined the metabolism of these AAs, their allocation in the hornets' respiration during rest and activity, and their incorporation into the body tissues. In hornets that consumed 13C proline, we detected the heavy isotope only in the exhaled CO2, suggesting that proline was utilized solely as a metabolic fuel and was not incorporated into their body (i.e., as protein). Labeled carbons from glycine and leucine, in contrast, were found in all the examined tissues (i.e., muscles, brain, fat bodies, ovaries, and venom glands), and were also utilized as a metabolic fuel, but mostly during rest. Using AAs labeled with a specific stable carbon isotope, we demonstrate the compatibility between the hornet's metabolic requirements and AA use, in both the living organism as a whole and in its different body tissues.
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Affiliation(s)
- Levona Bodner
- School of Zoology, Faculty of Life Sciences, Tel Aviv University, Tel Aviv, 6997801, Israel
| | - Sofia Bouchebti
- School of Zoology, Faculty of Life Sciences, Tel Aviv University, Tel Aviv, 6997801, Israel.
| | - Eran Levin
- School of Zoology, Faculty of Life Sciences, Tel Aviv University, Tel Aviv, 6997801, Israel
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