1
|
Van Baelen M, Bec A, Sperfeld E, Frizot N, Koussoroplis AM. Food quality shapes gradual phenotypic plasticity in ectotherms facing temperature variability. Ecology 2024; 105:e4263. [PMID: 38385889 DOI: 10.1002/ecy.4263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Revised: 11/06/2023] [Accepted: 12/21/2023] [Indexed: 02/23/2024]
Abstract
Organisms exhibit reversible physiological adjustments as a response to rapidly changing environments. Yet such plasticity of the phenotype is gradual and may lag behind environmental fluctuations, thereby affecting long-term average performance of the organisms. By supplying energy and essential compounds for optimal tissue building, food determines the range of possible phenotypic changes and potentially the rate at which they occur. Here, we assess how differences in the dietary supply of essential lipids modulate the phenotypic plasticity of an ectotherm facing thermal fluctuations. We use three phytoplankton strains to create a gradient of polyunsaturated fatty acid and sterol supply for Daphnia magna under constant and fluctuating temperatures. We used three different fluctuation periodicities to unravel the temporal dynamics of gradual plasticity and its long-term consequences for D. magna performance measured as juvenile somatic growth rate. In agreement with gradual plasticity theory, we show that in D. magna, fluctuation periodicity determines the differential between observed growth rates and those expected from constant conditions. Most importantly, we show that diet modulates both the size and the direction of the growth rate differential. Overall, we demonstrate that the nutritional context is essential for predicting ectotherm consumers' performance in fluctuating thermal environments.
Collapse
Affiliation(s)
- Marine Van Baelen
- Université Clermont Auvergne, CNRS, Laboratoire Microorganismes: Génome Environnement, Clermont-Ferrand, France
| | - Alexandre Bec
- Université Clermont Auvergne, CNRS, Laboratoire Microorganismes: Génome Environnement, Clermont-Ferrand, France
| | - Erik Sperfeld
- University of Greifswald, Zoological Institute and Museum, Greifswald, Germany
| | - Nathan Frizot
- Université Clermont Auvergne, CNRS, Laboratoire Microorganismes: Génome Environnement, Clermont-Ferrand, France
| | | |
Collapse
|
2
|
Bruhns T, Timm S, Feußner N, Engelhaupt S, Labrenz M, Wegner M, Sokolova IM. Combined effects of temperature and emersion-immersion cycles on metabolism and bioenergetics of the Pacific oyster Crassostrea (Magallana) gigas. MARINE ENVIRONMENTAL RESEARCH 2023; 192:106231. [PMID: 37862760 DOI: 10.1016/j.marenvres.2023.106231] [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: 08/25/2023] [Revised: 10/12/2023] [Accepted: 10/14/2023] [Indexed: 10/22/2023]
Abstract
Life on tidal coasts presents physiological major challenges for sessile species. Fluctuations in oxygen and temperature can affect bioenergetics and modulate metabolism and redox balance, but their combined effects are not well understood. We investigated the effects of intermittent hypoxia (12h/12h) in combination with different temperature regimes (normal (15 °C), elevated (30 °C) and fluctuating (15 °C water/30 °C air)) on the Pacific oyster Crassostrea (Magallana) gigas. Fluctuating temperature led to energetic costly metabolic rearrangements and accumulation of proteins in oyster tissues. Elevated temperature led to high (60%) mortality and oxidative damage in survivors. Normal temperature had no major negative effects but caused metabolic shifts. Our study shows high plasticity of oyster metabolism in response to oxygen and temperature fluctuations and indicates that metabolic adjustments to oxygen deficiency are strongly modulated by the ambient temperature. Co-exposure to constant elevated temperature and intermittent hypoxia demonstrates the limits of this adaptive metabolic plasticity.
Collapse
Affiliation(s)
- Torben Bruhns
- Department of Marine Biology, Institute for Biological Sciences, University of Rostock, Albert-Einstein-Str. 3, 18059, Rostock, Germany
| | - Stefan Timm
- Department of Plant Physiology, Institute for Biological Sciences, University of Rostock, Albert-Einstein-Str. 3, 18059, Rostock, Germany
| | - Nina Feußner
- Department of Marine Biology, Institute for Biological Sciences, University of Rostock, Albert-Einstein-Str. 3, 18059, Rostock, Germany
| | - Sonja Engelhaupt
- Department of Marine Biology, Institute for Biological Sciences, University of Rostock, Albert-Einstein-Str. 3, 18059, Rostock, Germany
| | - Matthias Labrenz
- Leibniz Institute for Baltic Sea Research (IOW), Department of Biological Oceanography, Seestraße 15, 18119, Rostock, Germany
| | - Mathias Wegner
- Alfred Wegener Institut - Helmholtz-Zentrum für Polar- und Meeresforschung, Coastal Ecology, Waddensea Station Sylt, Hafenstraße 43, 25992, List/Sylt, Germany
| | - Inna M Sokolova
- Department of Marine Biology, Institute for Biological Sciences, University of Rostock, Albert-Einstein-Str. 3, 18059, Rostock, Germany; Department of Maritime Systems, Interdisciplinary Faculty, University of Rostock, Albert-Einstein-Str. 21, 18059, Rostock, Germany.
| |
Collapse
|
3
|
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.
Collapse
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
| |
Collapse
|
4
|
Teh SS, Lau HLN. Phytonutrient content and oil quality of selected edible oils upon twelve months storage. J AM OIL CHEM SOC 2023. [DOI: 10.1002/aocs.12692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
Affiliation(s)
- Soek Sin Teh
- Energy and Environment Unit, Engineering and Processing Division, Malaysian Palm Oil Board Persiaran Institusi Kajang Malaysia
| | - Harrison Lik Nang Lau
- Energy and Environment Unit, Engineering and Processing Division, Malaysian Palm Oil Board Persiaran Institusi Kajang Malaysia
| |
Collapse
|
5
|
Bokhorst S, Bjerke JW, Phoenix GK, Jaakola L, Maehre HK, Tømmervik H. Sub-arctic mosses and lichens show idiosyncratic responses to combinations of winter heatwaves, freezing and nitrogen deposition. PHYSIOLOGIA PLANTARUM 2023; 175:e13882. [PMID: 36840682 DOI: 10.1111/ppl.13882] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 02/13/2023] [Accepted: 02/20/2023] [Indexed: 06/18/2023]
Abstract
Arctic ecosystems are increasingly exposed to extreme climatic events throughout the year, which can affect species performance. Cryptogams (bryophytes and lichens) provide important ecosystem services in polar ecosystems but may be physiologically affected or killed by extreme events. Through field and laboratory manipulations, we compared physiological responses of seven dominant sub-Arctic cryptogams (three bryophytes, four lichens) to single events and factorial combinations of mid-winter heatwave (6°C for 7 days), re-freezing, snow removal and summer nitrogen addition. We aimed to identify which mosses and lichens are vulnerable to these abiotic extremes and if combinations would exacerbate physiological responses. Combinations of extremes resulted in stronger species responses but included idiosyncratic species-specific responses. Species that remained dormant during winter (March), irrespective of extremes, showed little physiological response during summer (August). However, winter physiological activity, and response to winter extremes, was not consistently associated with summer physiological impacts. Winter extremes affect cryptogam physiology, but summer responses appear mild, and lichens affect the photobiont more than the mycobiont. Accounting for Arctic cryptogam response to multiple climatic extremes in ecosystem functioning and modelling will require a better understanding of their winter eco-physiology and repair capabilities.
Collapse
Affiliation(s)
- Stef Bokhorst
- Norwegian Institute for Nature Research (NINA), FRAM - High North Research Centre for Climate and the Environment, Tromsø, Norway
- Department of Ecological Science, VU University Amsterdam, Amsterdam, The Netherlands
| | - Jarle W Bjerke
- Norwegian Institute for Nature Research (NINA), FRAM - High North Research Centre for Climate and the Environment, Tromsø, Norway
| | - Gareth K Phoenix
- Plants Photosynthesis and Soil, School of Biosciences, The University of Sheffield, Sheffield, UK
| | - Laura Jaakola
- Climate Laboratory Holt, Department of Arctic and Marine Biology, UIT The Arctic University of Norway, Tromsø, Norway
- Norwegian Institute of Bioeconomy Research (NIBIO), Ås, Norway
| | - Hanne K Maehre
- Norwegian College of Fishery Science, Faculty of Biosciences, Fisheries and Economics, UIT The Arctic University of Norway, Tromsø, Norway
| | - Hans Tømmervik
- Norwegian Institute for Nature Research (NINA), FRAM - High North Research Centre for Climate and the Environment, Tromsø, Norway
| |
Collapse
|
6
|
Li JY, Gao YX, Li CY, Jin YL, Yang SQ, Xia JH, Zhang YF, Bu Y, Li K. Effects of Species Invasion and Inundation on the Collembola Community in Coastal Mudflat Wetland from the Perspective of Functional Traits. INSECTS 2023; 14:210. [PMID: 36835779 PMCID: PMC9963046 DOI: 10.3390/insects14020210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 02/15/2023] [Accepted: 02/15/2023] [Indexed: 06/18/2023]
Abstract
The group of soil arthropods known as Collembola is characterized by its abundance and sensitivity to environmental changes. They are ideal an species for soil indicators. In order to clarify the effects of species invasion and inundation on the Collembola community in coastal mudflat wetlands, the correlation between the collembolan functional traits and environmental factors was studied in Shanghai Jiuduansha Wetland National Nature Reserve for the first time. Five sample plots, including three vegetations-Spartina alterniflora (an invasive species), Phragmites australis, and Zizania latifolia-were set up following the differences in vegetation types and between high and low tidal flats. Data on the diversity of the Collembolan species and their functional traits were collected and combined with the soil physicochemical properties and vegetation environment factors in different tidal flats. The key findings and conclusions of the study are as follows: a total of 18 species, four families, and three orders make up the obtained Collembola, two species of Proisotoma are dominant species that account for 49.59% and 24.91% of the total, respectively. The maintenance of the species diversity of Collembola is disturbed by the higher conversion efficiency of Spartina alterniflora rather than Phragmites australis with lower organic carbon (C) content and higher total nitrogen (N) content. The primary environmental variables influencing species distribution were the C/N ratio, total N, and bulk soil density. The bulk density of the soil impacts the movement and dispersal of the functional traits. The depth of the soil layer is related to the functional traits of the sensory ability. The analysis of the functional traits and environment is fairly helpful in exploring how species respond to their environment and offers a better explanation for the habitat selection of Collembola.
Collapse
Affiliation(s)
- Jing-Yang Li
- School of Life Sciences, East China Normal University, Shanghai 200241, China
| | - Yun-Xia Gao
- Shanghai Xi Jiao School, Shanghai 200335, China
| | - Chun-Yang Li
- School of Life Sciences, East China Normal University, Shanghai 200241, China
| | - Ya-Li Jin
- Shanghai Natural History Museum, Shanghai Science & Technology Museum, Shanghai 200041, China
| | - Si-Qi Yang
- Shanghai Natural History Museum, Shanghai Science & Technology Museum, Shanghai 200041, China
| | - Jian-Hong Xia
- Shanghai Natural History Museum, Shanghai Science & Technology Museum, Shanghai 200041, China
| | - Yun-Fei Zhang
- Shanghai Natural History Museum, Shanghai Science & Technology Museum, Shanghai 200041, China
| | - Yun Bu
- Shanghai Natural History Museum, Shanghai Science & Technology Museum, Shanghai 200041, China
| | - Kai Li
- School of Life Sciences, East China Normal University, Shanghai 200241, China
| |
Collapse
|
7
|
Yoon DS, Byeon E, Kim DH, Lee MC, Shin KH, Hagiwara A, Park HG, Lee JS. Effects of temperature and combinational exposures on lipid metabolism in aquatic invertebrates. Comp Biochem Physiol C Toxicol Pharmacol 2022; 262:109449. [PMID: 36055628 DOI: 10.1016/j.cbpc.2022.109449] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 08/22/2022] [Accepted: 08/29/2022] [Indexed: 11/17/2022]
Abstract
Studies of changes in fatty acids in response to environmental temperature changes have been conducted in many species, particularly mammals. However, few studies have considered aquatic invertebrates, even though they are particularly vulnerable to changes in environmental temperature. In this review, we summarize the process by which animals synthesize common fatty acids and point out differences between the fatty acid profiles of vertebrates and those of aquatic invertebrates. Unlike vertebrates, some aquatic invertebrates can directly synthesize polyunsaturated fatty acids (PUFAs), which can be used to respond to temperature changes. Various studies have shown that aquatic invertebrates increase the degree of saturation in their fatty acids through an increase in saturated fatty acid production or a decrease in PUFAs as the temperature increases. In addition, we summarize recent studies that have examined the complex effects of temperature and combinational stressors to determine whether the degree of saturation in aquatic invertebrates is influenced by other factors. The combined effects of carbon dioxide partial pressure, food quality, starvation, salinity, and chemical exposures have been confirmed, and fatty acid profile changes in response to high temperature were greater than those from combinational stressors.
Collapse
Affiliation(s)
- Deok-Seo Yoon
- Department of Biological Sciences, College of Science, Sungkyunkwan University, Suwon 16419, South Korea
| | - Eunjin Byeon
- Department of Biological Sciences, College of Science, Sungkyunkwan University, Suwon 16419, South Korea
| | - Duck-Hyun Kim
- Department of Biological Sciences, College of Science, Sungkyunkwan University, Suwon 16419, South Korea
| | - Min-Chul Lee
- Department of Food & Nutrition, College of Bio-Nano Technology, Gachon University, Seongnam 13120, South Korea
| | - Kyung-Hoon Shin
- Department of Marine Science and Convergence Engineering, Hanyang University, Ansan 15588, South Korea
| | - Atsushi Hagiwara
- Graduate School of Fisheries and Environmental Sciences, Nagasaki University, Nagasaki 852-8521, Japan
| | - Heum Gi Park
- Department of Marine Ecology and Environment, College of Life Sciences, Gangneung-Wonju National University, Gangneung 25457, South Korea.
| | - Jae-Seong Lee
- Department of Biological Sciences, College of Science, Sungkyunkwan University, Suwon 16419, South Korea.
| |
Collapse
|
8
|
Manenti T, Kjærsgaard A, Schou TM, Pertoldi C, Moghadam NN, Loeschcke V. Responses to Developmental Temperature Fluctuation in Life History Traits of Five Drosophila Species (Diptera: Drosophilidae) from Different Thermal Niches. INSECTS 2021; 12:insects12100925. [PMID: 34680694 PMCID: PMC8540664 DOI: 10.3390/insects12100925] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Accepted: 10/09/2021] [Indexed: 11/16/2022]
Abstract
Temperature has profound effects on biochemical processes as suggested by the extensive variation in performance of organisms across temperatures. Nonetheless, the use of fluctuating temperature (FT) regimes in laboratory experiments compared to constant temperature (CT) regimes is still mainly applied in studies of model organisms. We investigated how two amplitudes of developmental temperature fluctuation (22.5/27.5 °C and 20/30 °C, 12/12 h) affected several fitness-related traits in five Drosophila species with markedly different thermal resistance. Egg-to-adult viability did not change much with temperature except in the cold-adapted D. immigrans. Developmental time increased with FT among all species compared to the same mean CT. The impact of FT on wing size was quite diverse among species. Whereas wing size decreased quasi-linearly with CT in all species, there were large qualitative differences with FT. Changes in wing aspect ratio due to FT were large compared to the other traits and presumably a consequence of thermal stress. These results demonstrate that species of the same genus but with different thermal resistance can show substantial differences in responses to fluctuating developmental temperatures not predictable by constant developmental temperatures. Testing multiple traits facilitated the interpretation of responses to FT in a broader context.
Collapse
Affiliation(s)
- Tommaso Manenti
- Department of Biology, Aarhus University, Ny Munkegade 114-116, DK-8000 Aarhus, Denmark; (A.K.); (T.M.S.); (V.L.)
- Laboratori Biokyma srl, Loc.Mocaia 44b, 52031 Anghiari, AR, Italy
- Correspondence: or
| | - Anders Kjærsgaard
- Department of Biology, Aarhus University, Ny Munkegade 114-116, DK-8000 Aarhus, Denmark; (A.K.); (T.M.S.); (V.L.)
| | - Toke Munk Schou
- Department of Biology, Aarhus University, Ny Munkegade 114-116, DK-8000 Aarhus, Denmark; (A.K.); (T.M.S.); (V.L.)
| | - Cino Pertoldi
- Section of Biology and Environmental Science, Aalborg University, Frederik Bajers vej 7H, DK-9220 Aalborg, Denmark; (C.P.); (N.N.M.)
- Aalborg Zoo, Mølleparkvej 63, DK-9000 Aalborg, Denmark
| | - Neda N. Moghadam
- Section of Biology and Environmental Science, Aalborg University, Frederik Bajers vej 7H, DK-9220 Aalborg, Denmark; (C.P.); (N.N.M.)
- Department of Biological and Environmental Science, University of Jyväskylä, FI-40014 Jyväskylä, Finland
| | - Volker Loeschcke
- Department of Biology, Aarhus University, Ny Munkegade 114-116, DK-8000 Aarhus, Denmark; (A.K.); (T.M.S.); (V.L.)
| |
Collapse
|
9
|
Ashbrook AR, Scharf ME, Bennett GW, Gondhalekar AD. Bed bugs (Cimex lectularius L.) exhibit limited ability to develop heat resistance. PLoS One 2019; 14:e0211677. [PMID: 30731005 PMCID: PMC6366730 DOI: 10.1371/journal.pone.0211677] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2018] [Accepted: 01/20/2019] [Indexed: 12/17/2022] Open
Abstract
The global population growth of the bed bug, Cimex lectularius (L.), is attributed to their cryptic behavior, diverse insecticide resistance mechanisms, and lack of public awareness. Bed bug control can be challenging and typically requires chemical and non-chemical treatments. One common non-chemical method for bed bug management is thermal remediation. However, in certain instances, bed bugs are known to survive heat treatments. Bed bugs may be present after a heat treatment due to (i) abiotic factors associated with the inability to achieve lethal temperatures in harborage areas for a sufficient time period, (ii) re-infestation from insects that escaped to cooler areas during a heat treatment or (iii) development of physiological resistance that allows them to survive heat exposure. Previous research has investigated the optimal temperature and exposure time required for either achieving complete mortality or sublethally affecting their growth and development. However, no research has examined bed bug populations for their ability to develop resistance to heat exposure and variation in thermo-tolerance between different bed bug strains. The goals of this study were: i) to determine if bed bugs could be selected for heat resistance under a laboratory selection regime, and ii) to determine if bed bug populations with various heat exposure histories, insecticide resistance profiles, and geographic origins have differential temperature tolerances using two heat exposure techniques (step-function and ramp-function). Selection experiments found an initial increase in bed bug survivorship; however, survivorship did not increase past the fourth generation. Sublethal exposure to heat significantly reduced bed bug feeding and, in some cases, inhibited development. The step-function exposure technique revealed non-significant variation in heat tolerance between populations and the ramp-function exposure technique provided similar results. Based on these study outcomes, the ability of bed bugs to develop heat resistance appears to be limited.
Collapse
Affiliation(s)
- Aaron R. Ashbrook
- Department of Entomology, Purdue University, West Lafayette, Indiana, United States of America
| | - Michael E. Scharf
- Department of Entomology, Purdue University, West Lafayette, Indiana, United States of America
| | - Gary W. Bennett
- Department of Entomology, Purdue University, West Lafayette, Indiana, United States of America
| | - Ameya D. Gondhalekar
- Department of Entomology, Purdue University, West Lafayette, Indiana, United States of America
- * E-mail:
| |
Collapse
|
10
|
Wang Z, Chen Y, Diaz R, Laine RA. Physiology of crapemyrtle bark scale, Acanthococcus lagerstroemiae (Kuwana), associated with seasonally altered cold tolerance. JOURNAL OF INSECT PHYSIOLOGY 2019; 112:1-8. [PMID: 30445022 DOI: 10.1016/j.jinsphys.2018.11.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2018] [Revised: 10/25/2018] [Accepted: 11/12/2018] [Indexed: 06/09/2023]
Abstract
Temperature is one of the most important abiotic factors influencing the adaptation and diversification of insects. Diverse and complex physiological mechanisms have evolved to help insects adapt to seasonal changes in temperature and prevent cold injury. Although the mechanisms of seasonal adaptation to low temperatures have been studied for insects in different taxa, none of these mechanisms have been investigated in scale insects in the superfamily Coccoidea. The crapemyrtle bark scale, Acanthococcus lagerstroemiae (Kuwana) (Hemiptera: Eriococcidae), is a newly introduced scale pest of crapemyrtles, Lagerstroemia spp. (Myrtales: Lythraceae). Our previous study concerning the cold tolerance of this pest suggested that, from summer to winter, A. lagerstroemiae seasonally adapted to lower temperature with a 5 °C reduction of supercooling points. In addition, time required to achieve the same levels of mortality at lower temperatures also increased. In this study, we used A. lagerstroemiae as a model system to investigate the physiological mechanisms correlated with changes in cold tolerance in scale insects, by measuring water content, lipid content and fatty acid composition, and cryoprotective polyols and sugars every other month. Results suggested that water content was lower in winter and early spring than in summer and early fall (40.8% vs. 63.3%). The proportions of the fatty acids in PL were similar over seasons, but in TAG, shorter chain fatty acids (from C6:0 to C10:0) increased in winter as longer chain fatty acids (from C14:0 to C18:0) decreased. Among all measured polyols and sugars, including glycerol, d-mannitol, myo-inositol, and d-trehalose, the levels of d-mannitol were the highest in January 2016, which were 19-times of those in March 2016 and 4.5-times of those in September 2016. Results from this study provide a better understanding on how A. lagerstroemiae overwinters, which may give insights into the overwintering strategies of other scale insects.
Collapse
Affiliation(s)
- Zinan Wang
- Department of Entomology, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, USA.
| | - Yan Chen
- Hammond Research Station, Louisiana State University Agricultural Center, Hammond, LA 70403, USA
| | - Rodrigo Diaz
- Department of Entomology, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, USA.
| | - Roger A Laine
- Departments of Biological Sciences and Chemistry, Louisiana State University, Baton Rouge, LA 70803, USA
| |
Collapse
|
11
|
Bokhorst S, Berg MP, Edvinsen GK, Ellers J, Heitman A, Jaakola L, Mæhre HK, Phoenix GK, Tømmervik H, Bjerke JW. Impact of Multiple Ecological Stressors on a Sub-Arctic Ecosystem: No Interaction Between Extreme Winter Warming Events, Nitrogen Addition and Grazing. FRONTIERS IN PLANT SCIENCE 2018; 9:1787. [PMID: 30559757 PMCID: PMC6284199 DOI: 10.3389/fpls.2018.01787] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Accepted: 11/16/2018] [Indexed: 06/09/2023]
Abstract
Climate change is one of many ongoing human-induced environmental changes, but few studies consider interactive effects between multiple anthropogenic disturbances. In coastal sub-arctic heathland, we quantified the impact of a factorial design simulating extreme winter warming (WW) events (7 days at 6-7°C) combined with episodic summer nitrogen (+N) depositions (5 kg N ha-1) on plant winter physiology, plant community composition and ecosystem CO2 fluxes of an Empetrum nigrum dominated heathland during 3 consecutive years in northern Norway. We expected that the +N would exacerbate any stress effects caused by the WW treatment. During WW events, ecosystem respiration doubled, leaf respiration declined (-58%), efficiency of Photosystem II (Fv/Fm) increased (between 26 and 88%), while cell membrane fatty acids showed strong compositional changes as a result of the warming and freezing. In particular, longer fatty acid chains increased as a result of WW events, and eicosadienoic acid (C20:2) was lower when plants were exposed to the combination of WW and +N. A larval outbreak of geometrid moths (Epirrita autumnata and Operophtera brumata) following the first WW led to a near-complete leaf defoliation of the dominant dwarf shrubs E. nigrum (-87%) and Vaccinium myrtillus (-81%) across all experimental plots. Leaf emergence timing, plant biomass or composition, NDVI and growing season ecosystem CO2 fluxes were unresponsive to the WW and +N treatments. The limited plant community response reflected the relative mild winter freezing temperatures (-6.6°C to -11.8°C) recorded after the WW events, and that the grazing pressure probably overshadowed any potential treatment effects. The grazing pressure and WW both induce damage to the evergreen shrubs and their combination should therefore be even stronger. In addition, +N could have exacerbated the impact of both extreme events, but the ecosystem responses did not support this. Therefore, our results indicate that these sub-arctic Empetrum-dominated ecosystems are highly resilient and that their responses may be limited to the event with the strongest impact.
Collapse
Affiliation(s)
- Stef Bokhorst
- Norwegian Institute for Nature Research, FRAM – High North Research Centre for Climate and the Environment, Tromsø, Norway
- Department of Ecological Science, Vrije Universiteit Amsterdam, Amsterdam, Netherlands
| | - Matty P. Berg
- Department of Ecological Science, Vrije Universiteit Amsterdam, Amsterdam, Netherlands
- Community and Conservation Ecology Group, Groningen Institute for Evolutionary Life Sciences, Groningen, Netherlands
| | - Guro K. Edvinsen
- Faculty of Biosciences, Fisheries and Economics, Norwegian College of Fishery Science, UiT The Arctic University of Norway, Tromsø, Norway
| | - Jacintha Ellers
- Department of Ecological Science, Vrije Universiteit Amsterdam, Amsterdam, Netherlands
| | - Amber Heitman
- Department of Ecological Science, Vrije Universiteit Amsterdam, Amsterdam, Netherlands
| | - Laura Jaakola
- Norwegian Institute of Bioeconomy Research, Ås, Norway
- Climate Laboratory Holt, Department of Arctic and Marine Biology, UiT The Arctic University of Norway, Tromsø, Norway
| | - Hanne K. Mæhre
- Faculty of Biosciences, Fisheries and Economics, Norwegian College of Fishery Science, UiT The Arctic University of Norway, Tromsø, Norway
| | - Gareth K. Phoenix
- Department of Animal and Plant Sciences, University of Sheffield, Sheffield, United Kingdom
| | - Hans Tømmervik
- Norwegian Institute for Nature Research, FRAM – High North Research Centre for Climate and the Environment, Tromsø, Norway
| | - Jarle W. Bjerke
- Norwegian Institute for Nature Research, FRAM – High North Research Centre for Climate and the Environment, Tromsø, Norway
| |
Collapse
|
12
|
Broberg M, Dubey M, Sun MH, Ihrmark K, Schroers HJ, Li SD, Jensen DF, Brandström Durling M, Karlsson M. Out in the Cold: Identification of Genomic Regions Associated With Cold Tolerance in the Biocontrol Fungus Clonostachys rosea Through Genome-Wide Association Mapping. Front Microbiol 2018; 9:2844. [PMID: 30524411 PMCID: PMC6262169 DOI: 10.3389/fmicb.2018.02844] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Accepted: 11/05/2018] [Indexed: 01/16/2023] Open
Abstract
There is an increasing importance for using biocontrol agents in combating plant diseases sustainably and in the long term. As large scale genomic sequencing becomes economically viable, the impact of single nucleotide polymorphisms (SNPs) on biocontrol-associated phenotypes can be easily studied across entire genomes of fungal populations. Here, we improved a previously reported genome assembly of the biocontrol fungus Clonostachys rosea strain IK726 using the PacBio sequencing platform, which resulted in a total genome size of 70.7 Mbp and 21,246 predicted genes. We further performed whole-genome re-sequencing of 52 additional C. rosea strains isolated globally using Illumina sequencing technology, in order to perform genome-wide association studies in conditions relevant for biocontrol activity. One such condition is the ability to grow at lower temperatures commonly encountered in cryic or frigid soils in temperate regions, as these will be prevalent for protecting growing crops in temperate climates. Growth rates at 10°C on potato dextrose agar of the 53 sequenced strains of C. rosea were measured and ranged between 0.066 and 0.413 mm/day. Performing a genome wide association study, a total of 1,478 SNP markers were significantly associated with the trait and located in 227 scaffolds, within or close to (< 1000 bp distance) 265 different genes. The predicted gene products included several chaperone proteins, membrane transporters, lipases, and proteins involved in chitin metabolism with possible roles in cold tolerance. The data reported in this study provides a foundation for future investigations into the genetic basis for cold tolerance in fungi, with important implications for biocontrol.
Collapse
Affiliation(s)
- Martin Broberg
- Department of Forest Mycology and Plant Pathology, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - Mukesh Dubey
- Department of Forest Mycology and Plant Pathology, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - Man-Hong Sun
- Key Laboratory of Integrated Pest Management in Crops, Ministry of Agriculture, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Katarina Ihrmark
- Department of Forest Mycology and Plant Pathology, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | | | - Shi-Dong Li
- Key Laboratory of Integrated Pest Management in Crops, Ministry of Agriculture, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Dan Funck Jensen
- Department of Forest Mycology and Plant Pathology, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - Mikael Brandström Durling
- Department of Forest Mycology and Plant Pathology, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - Magnus Karlsson
- Department of Forest Mycology and Plant Pathology, Swedish University of Agricultural Sciences, Uppsala, Sweden
| |
Collapse
|
13
|
Bowler K. Heat death in poikilotherms: Is there a common cause? J Therm Biol 2018; 76:77-79. [DOI: 10.1016/j.jtherbio.2018.06.007] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2018] [Accepted: 06/15/2018] [Indexed: 11/25/2022]
|
14
|
Sprenger PP, Burkert LH, Abou B, Federle W, Menzel F. Coping with the climate: cuticular hydrocarbon acclimation of ants under constant and fluctuating conditions. ACTA ACUST UNITED AC 2018; 221:jeb.171488. [PMID: 29615527 DOI: 10.1242/jeb.171488] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2017] [Accepted: 03/29/2018] [Indexed: 11/20/2022]
Abstract
Terrestrial arthropods achieve waterproofing by a layer of cuticular hydrocarbons (CHCs). At the same time, CHCs also serve as communication signals. To maintain waterproofing under different climate conditions, insects adjust the chemical composition of their CHC layer, but this may affect the communication via CHCs. The detailed acclimatory changes of CHCs and how these influence their physical properties are still unknown. Here, we studied acclimation in two closely related ant species with distinct CHC profiles, Myrmica rubra and Myrmica ruginodis, in response to constant or fluctuating temperature and humidity regimes. We measured how acclimation affected CHC composition and viscosity, and the ants' drought survival. In both species, CHC composition showed strong, predictable responses to temperature regimes. Warm-acclimated individuals had higher proportions of linear alkanes, and less methyl-branched or unsaturated CHCs. These changes coincided with higher solid content and viscosity of CHCs in warm-acclimated ants. Temperature fluctuation caused effects similar to those observed under constant-cool conditions in Mrubra, but led to entirely different profiles in Mruginodis, suggesting that fluctuating and constant conditions pose very different challenges. Acclimation to dry conditions led to higher absolute amounts of CHCs, which increased the ants' drought survival, whereas temperature acclimation did not. Hence, the temperature-induced CHC changes cannot be explained by the need for waterproofing alone. Although these changes could be non-adaptive, we propose that they serve to maintain a constant CHC viscosity, which may be essential for communication and other functions.
Collapse
Affiliation(s)
- Philipp P Sprenger
- Institute of Organismic and Molecular Evolution, Faculty of Biology, Johannes Gutenberg University, 55128 Mainz, Germany
| | - Lars H Burkert
- Institute of Organismic and Molecular Evolution, Faculty of Biology, Johannes Gutenberg University, 55128 Mainz, Germany
| | - Bérengère Abou
- Matière et Systèmes Complexes (MSC), UMR CNRS 7057, Université Paris Diderot, 75205 Paris Cedex 13, France
| | - Walter Federle
- Department of Zoology, University of Cambridge, Cambridge CB2 3EJ, UK
| | - Florian Menzel
- Institute of Organismic and Molecular Evolution, Faculty of Biology, Johannes Gutenberg University, 55128 Mainz, Germany
| |
Collapse
|
15
|
Malcicka M, Ruther J, Ellers J. De novo Synthesis of Linoleic Acid in Multiple Collembola Species. J Chem Ecol 2017; 43:911-919. [DOI: 10.1007/s10886-017-0878-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Revised: 07/24/2017] [Accepted: 08/09/2017] [Indexed: 01/15/2023]
|
16
|
Liefting M, Cosijn J, Ellers J. Synergistic effect of daily temperature fluctuations and matching light-dark cycle enhances population growth and synchronizes oviposition behavior in a soil arthropod. JOURNAL OF INSECT PHYSIOLOGY 2017; 96:108-114. [PMID: 27751889 DOI: 10.1016/j.jinsphys.2016.10.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Revised: 10/08/2016] [Accepted: 10/10/2016] [Indexed: 06/06/2023]
Abstract
Some major aspects of insect life, like development time and reproduction, can benefit from fluctuating temperatures rather than a constant temperature regime. The benefit of fluctuating temperature has generally been attributed to the non-linear properties of the relationship of many life history traits with temperature. Daily temperature rise, however, usually coincide with the light phase of the photoperiodic cycle and there could be a benefit in linking daily temperature fluctuations with light and dark phases e.g. to anticipate the change in temperature. Such synergistic effects have primarily been studied in the light of activity patterns and gene expression, but have not yet been shown to extend to population dynamics and aspects of individual fitness like oviposition behavior. We therefore explored possible synergistic effects on life history traits of the springtail Orchesella cincta. We first test the primary effect of ecologically relevant temperature fluctuations of different amplitudes on population growth and total population mass. The slowest population growth was observed in the constant temperature regime treatment and the highest population growth in the regime with high amplitude fluctuations. In a second experiment, population growth and oviposition rhythm were measured under four different regimes; a constant light and temperature regime, thermoperiod only, photoperiod only and thermoperiod and photoperiod aligned as under natural conditions. The regime in which thermoperiod was aligned with photoperiod resulted in a higher population growth than could be realized by either factor alone. Also, significantly fewer eggs were laid in the constant temperature/light regime than in the other three regimes, strongly suggesting that this regime is stressful to O. cincta. Additionally, the fraction of eggs laid at night was highest in the regime with the combined temperature and light cycle. In conclusion, our results show that under these experimental conditions there is a synergistic effect of daily temperature fluctuations in combination with light/dark phases that can considerably influence important life history traits and affect behavior. Such effects are likely to be relevant under natural conditions.
Collapse
Affiliation(s)
- Maartje Liefting
- Animal Ecology, Faculty of Earth and Life Sciences, De Boelelaan 1085, 1081 HV Amsterdam, VU University Amsterdam, The Netherlands.
| | - Jarno Cosijn
- Animal Ecology, Faculty of Earth and Life Sciences, De Boelelaan 1085, 1081 HV Amsterdam, VU University Amsterdam, The Netherlands
| | - Jacintha Ellers
- Animal Ecology, Faculty of Earth and Life Sciences, De Boelelaan 1085, 1081 HV Amsterdam, VU University Amsterdam, The Netherlands
| |
Collapse
|
17
|
Rodrigues ET, Moreno A, Mendes T, Palmeira C, Pardal MÂ. Biochemical and physiological responses of Carcinus maenas to temperature and the fungicide azoxystrobin. CHEMOSPHERE 2015; 132:127-134. [PMID: 25835271 DOI: 10.1016/j.chemosphere.2015.03.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2014] [Revised: 03/07/2015] [Accepted: 03/10/2015] [Indexed: 06/04/2023]
Abstract
Research on the effects of thermal stress is currently pertinent as climate change is expected to cause more severe climate-driven events. Carcinus maenas, a recognised estuarine model organism, was selected to test temperature-dependence of azoxystrobin toxicity, a widely applied fungicide. Crabs' responses were assessed after a 10-d acclimation at different temperatures (5°C, 22°C, and 27°C) of which the last 72h were of exposure to an environmental concentration of azoxystrobin. SOD and GST activities, mitochondrial oxygen consumption rates and protein content, as well as the Coupling Index were determined. The hypothesis proposed that extreme temperatures (5°C and 27°C) and azoxystrobin would affect crabs' responses. Results showed statistically significant different effects of SOD and all oxygen rates measured promoted by temperature, and that neither 30.3μgL(-1) of azoxystrobin nor the combined effect were crab-responsive. Protein content at 5°C was statistically higher when compared with the control temperature (22°C). The Coupling Index revealed both a slight and a drastic decrease of this index promoted by 5°C and 27°C, respectively. Regarding azoxystrobin effects, at 22°C, this index only decreased slightly. However, at extreme temperatures it fell 47% at 5°C and slightly increased at 27°C. Results provided evidence that crabs' responses to cope with low temperatures were more effective than their responses to cope with high temperatures, which are expected in future climate projections. Moreover, crabs are capable of handling environmental concentrations of azoxystrobin. However, the Coupling Index showed that combined stress factors unbalance crabs' natural capability to handle a single stressor.
Collapse
Affiliation(s)
- Elsa Teresa Rodrigues
- CFE - Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, Calçada Martim de Freitas, 3000-456 Coimbra, Portugal.
| | - António Moreno
- IMAR - Instituto do Mar, Department of Life Sciences, University of Coimbra, Calçada Martim de Freitas, 3000-456 Coimbra, Portugal.
| | - Tito Mendes
- CFE - Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, Calçada Martim de Freitas, 3000-456 Coimbra, Portugal.
| | - Carlos Palmeira
- CNC - Center for Neuroscience and Cell Biology, Department of Life Sciences, University of Coimbra, Calçada Martim de Freitas, 3000-456 Coimbra, Portugal.
| | - Miguel Ângelo Pardal
- CFE - Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, Calçada Martim de Freitas, 3000-456 Coimbra, Portugal.
| |
Collapse
|
18
|
Colinet H, Sinclair BJ, Vernon P, Renault D. Insects in fluctuating thermal environments. ANNUAL REVIEW OF ENTOMOLOGY 2015; 60:123-40. [PMID: 25341105 DOI: 10.1146/annurev-ento-010814-021017] [Citation(s) in RCA: 416] [Impact Index Per Article: 46.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
All climate change scenarios predict an increase in both global temperature means and the magnitude of seasonal and diel temperature variation. The nonlinear relationship between temperature and biological processes means that fluctuating temperatures lead to physiological, life history, and ecological consequences for ectothermic insects that diverge from those predicted from constant temperatures. Fluctuating temperatures that remain within permissive temperature ranges generally improve performance. By contrast, those which extend to stressful temperatures may have either positive impacts, allowing repair of damage accrued during exposure to thermal extremes, or negative impacts from cumulative damage during successive exposures. We discuss the mechanisms underlying these differing effects. Fluctuating temperatures could be used to enhance or weaken insects in applied rearing programs, and any prediction of insect performance in the field-including models of climate change or population performance-must account for the effect of fluctuating temperatures.
Collapse
Affiliation(s)
- Hervé Colinet
- UMR CNRS 6553, Université de Rennes 1, 35042 Rennes Cedex, France; ,
| | | | | | | |
Collapse
|
19
|
Böhm M, Schultz S, Koussoroplis AM, Kainz MJ. Tissue-specific fatty acids response to different diets in common carp (Cyprinus carpio L.). PLoS One 2014; 9:e94759. [PMID: 24733499 PMCID: PMC3986219 DOI: 10.1371/journal.pone.0094759] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2013] [Accepted: 03/20/2014] [Indexed: 12/16/2022] Open
Abstract
Fish depend on dietary fatty acids (FA) to support their physiological condition and health. Exploring the FA distribution in common carp (Cyprinus carpio), one of the world's most consumed freshwater fish, is important to understand how and where FA of different sources are allocated. We investigated diet effects on the composition of polar and neutral lipid fatty acids (PLFA and NLFA, respectively) in eight different tissues (dorsal and ventral muscle, heart, kidney, intestine, eyes, liver and adipose tissue) of common carp. Two-year old carp were exposed to three diet sources (i.e., zooplankton, zooplankton plus supplementary feeds containing vegetable, VO, or fish oil, FO) with different FA composition. The PLFA and NLFA response was clearly tissue-specific after 210 days of feeding on different diets. PLFA were generally rich in omega-3 polyunsaturated FA and only marginally influenced by dietary FA, whereas the NLFA composition strongly reflected dietary FA profiles. However, the NLFA composition in carp tissues varied considerably at low NLFA mass ratios, suggesting that carp is able to regulate the NLFA composition and thus FA quality in its tissues when NLFA contents are low. Finally, this study shows that FO were 3X more retained than VO as NLFA particularly in muscle tissues, indicating that higher nutritional quality feeds are selectively allocated into tissues and thus available for human consumption.
Collapse
Affiliation(s)
- Markus Böhm
- WasserCluster –Biologische Station Lunz, Dr. Carl Kupelwieser, Lunz am See, Austria
- University of Vienna, Department of Limnology, Wien, Austria
| | - Sebastian Schultz
- WasserCluster –Biologische Station Lunz, Dr. Carl Kupelwieser, Lunz am See, Austria
- University of Vienna, Department of Limnology, Wien, Austria
| | | | - Martin J. Kainz
- WasserCluster –Biologische Station Lunz, Dr. Carl Kupelwieser, Lunz am See, Austria
| |
Collapse
|
20
|
Reynolds AM, Lee RE, Costanzo JP. Membrane adaptation in phospholipids and cholesterol in the widely distributed, freeze-tolerant wood frog, Rana sylvatica. J Comp Physiol B 2014; 184:371-83. [DOI: 10.1007/s00360-014-0805-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2013] [Revised: 01/08/2014] [Accepted: 01/17/2014] [Indexed: 10/25/2022]
|
21
|
van Dooremalen C, Berg MP, Ellers J. Acclimation responses to temperature vary with vertical stratification: implications for vulnerability of soil-dwelling species to extreme temperature events. GLOBAL CHANGE BIOLOGY 2013; 19:975-984. [PMID: 23504852 DOI: 10.1111/gcb.12081] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2012] [Accepted: 10/22/2012] [Indexed: 06/01/2023]
Abstract
The occurrence of summer heat waves is predicted to increase in amplitude and frequency in the near future, but the consequences of such extreme events are largely unknown, especially for belowground organisms. Soil organisms usually exhibit strong vertical stratification, resulting in more frequent exposure to extreme temperatures for surface-dwelling species than for soil-dwelling species. Therefore soil-dwelling species are expected to have poor acclimation responses to cope with temperature changes. We used five species of surface-dwelling and four species of soil-dwelling Collembola that habituate different depths in the soil. We tested for differences in tolerance to extreme temperatures after acclimation to warm and cold conditions. We also tested for differences in acclimation of the underlying physiology by looking at changes in membrane lipid composition. Chill coma recovery time, heat knockdown time and fatty acid profiles were determined after 1 week of acclimation to either 5 or 20 °C. Our results showed that surface-dwelling Collembola better maintained increased heat tolerance across acclimation temperatures, but no such response was found for cold tolerance. Concordantly, four of the five surface-dwelling Collembola showed up to fourfold changes in relative abundance of fatty acids after 1 week of acclimation, whereas none of the soil-dwelling species showed a significant adjustment in fatty acid composition. Strong physiological responses to temperature fluctuations may have become redundant in soil-dwelling species due to the relative thermal stability of their subterranean habitat. Based on the results of the four species studied, we expect that unless soil-dwelling species can temporarily retreat to avoid extreme temperatures, the predicted increase in heat waves under climatic change renders these soil-dwelling species more vulnerable to extinction than species with better physiological capabilities. Being able to act under a larger thermal range is probably costly and could reduce maximum performance at the optimal temperature.
Collapse
Affiliation(s)
- Coby van Dooremalen
- Animal Ecology Group, Department of Ecological Science, VU University Amsterdam, De Boelelaan 1085, Amsterdam, 1081 HV, The Netherlands
| | | | | |
Collapse
|
22
|
Marshall KE, Sinclair BJ. The impacts of repeated cold exposure on insects. ACTA ACUST UNITED AC 2012; 215:1607-13. [PMID: 22539727 DOI: 10.1242/jeb.059956] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Insects experience repeated cold exposure (RCE) on multiple time scales in natural environments, yet the majority of studies of the effects of cold on insects involve only a single exposure. Three broad groups of experimental designs have been employed to examine the effects of RCE on insect physiology and fitness, defined by the control treatments: 'RCE vs cold', which compares RCE with constant cold conditions; 'RCE vs warm', which compares RCE with constant warm conditions; and 'RCE vs matched cold' which compares RCE with a prolonged period of cold matched by time to the RCE condition. RCE are generally beneficial to immediate survival, and increase cold hardiness relative to insects receiving a single prolonged cold exposure. However, the effects of RCE depend on the study design, and RCE vs warm studies cannot differentiate between the effects of cold exposure in general vs RCE in particular. Recent studies of gene transcription, immune function, feeding and reproductive output show that the responses of insects to RCE are distinct from the responses to single cold exposures. We suggest that future research should attempt to elucidate the mechanistic link between physiological responses and fitness parameters. We also recommend that future RCE experiments match the time spent at the stressful low temperature in all experimental groups, include age controls where appropriate, incorporate a pilot study to determine time and intensity of exposure, and measure sub-lethal impacts on fitness.
Collapse
Affiliation(s)
- Katie E Marshall
- Department of Biology, The University of Western Ontario, London, ON, Canada N6G 1L3
| | | |
Collapse
|