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Niu Z, Pu P, Zhang T, Jia L, Li X, Wang H, Ma M, Tang X, Chen Q. Effects of warming at embryonic and larval stages on tadpole fitness in high-altitude Rana kukunoris. J Therm Biol 2024; 123:103895. [PMID: 38996476 DOI: 10.1016/j.jtherbio.2024.103895] [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: 02/19/2024] [Revised: 05/05/2024] [Accepted: 06/11/2024] [Indexed: 07/14/2024]
Abstract
Global warming may affect the early developmental stages of high-altitude amphibians, thereby influencing their later fitness. Yet, this has been largely unexplored. To investigate whether and how the temperatures experienced by embryonic and larval stages affect their fitness at later developmental stages, we designed two experiments in which the embryos and larvae were treated with three temperatures (24, 18 and 12 °C), respectively. Then, the life history traits of the tadpoles during the metamorphotic climax in all treatments were evaluated, including growth rate, survival rate, morphology, thermal physiology, swimming performance, standard metabolic rate (SMR), oxidative and antioxidative system, and metabolic enzyme activities. The results revealed that elevated temperature accelerated metamorphosis but decreased body size at metamorphosis. Additionally, warming during the embryonic and larval stages decreased the thermal tolerance range and induced increased oxidative stress. Furthermore, high embryonic temperature significantly decreased the hatching success, but had no significant effect on swimming performance and SMR. Warming during larval periods was harmful to the survival and swimming performance of tadpoles. The effect size analysis revealed that the negative impacts of embryonic temperature on certain physiological traits, such as growth and development, survival and swimming performance, were more pronounced than those of larval temperature. Our results highlight the necessity for particular attention to be paid to the early stages of amphibians, notably the embryonic stages when evaluating the impact of global warming on their survival.
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Affiliation(s)
- Zhiyi Niu
- Department of Animal and Biomedical Sciences, School of Life Science, Lanzhou University, No. 222 Tianshui South Road, Lanzhou, Gansu Province, 730000, China
| | - Peng Pu
- School of Biological and Pharmaceutical Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, China
| | - Tao Zhang
- Department of Animal and Biomedical Sciences, School of Life Science, Lanzhou University, No. 222 Tianshui South Road, Lanzhou, Gansu Province, 730000, China
| | - Lun Jia
- Department of Animal and Biomedical Sciences, School of Life Science, Lanzhou University, No. 222 Tianshui South Road, Lanzhou, Gansu Province, 730000, China
| | - Xinying Li
- Department of Animal and Biomedical Sciences, School of Life Science, Lanzhou University, No. 222 Tianshui South Road, Lanzhou, Gansu Province, 730000, China
| | - Huihui Wang
- School of Stomatology, Lanzhou University, No. 199, Donggang West Road, Lanzhou, Gansu Province 730000, China
| | - Miaojun Ma
- State Key Laboratory of Grassland and Agro-Ecosystems, College of Ecology, Lanzhou University, No. 222 Tianshui South Road, Lanzhou, Gansu Province, 730000, China
| | - Xiaolong Tang
- Department of Animal and Biomedical Sciences, School of Life Science, Lanzhou University, No. 222 Tianshui South Road, Lanzhou, Gansu Province, 730000, China.
| | - Qiang Chen
- Department of Animal and Biomedical Sciences, School of Life Science, Lanzhou University, No. 222 Tianshui South Road, Lanzhou, Gansu Province, 730000, China
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Zhang N, Ma LX, Dong YW. Flight or fight: different strategies of intertidal periwinkle Littoraria sinensis coping with high temperature across populations. Integr Zool 2024. [PMID: 38897980 DOI: 10.1111/1749-4877.12857] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/21/2024]
Abstract
Intertidal organisms usually live near their upper thermal limits, and are vulnerable to future global warming. As a vital response to thermal stress, thermoregulatory strategy in physiological and behavioral performance is essential for organisms coping with thermal stress and surviving the changing world. To investigate the relationship between the thermoregulatory strategy and habitat temperature, in the present study, we comparatively investigated the thermal responsive strategy among different geographic populations of the supralittoral snail Littoraria sinensis by determining snails' cardiac function and behavioral performance. Our results indicated that populations inhabiting high ambient temperatures had higher sublethal temperatures (i.e. Arrhenius breakpoint temperatures, ABTs, the temperature at which the heart rate shapely decreases with further heating) and lethal temperatures (i.e. Flatline temperatures, FLTs, the temperature at which heart rate ceases), and behaved less actively (e.g. shorter moving distances and shorter moving time) in the face of high and rising temperatures-a physiological fight strategy. On the other hand, populations at relatively low ambient temperatures had relatively lower physiological upper thermal limits with lower ABTs and FLTs and moved more actively in the face of high and rising temperatures-a behavioral flight strategy. These results demonstrate that the thermoregulatory strategies of the snails are closely related to their habitat temperatures and are different among populations surviving divergent thermal environments.
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Affiliation(s)
- Ning Zhang
- Key Laboratory of Mariculture, Ministry of Education, Fisheries College, Ocean University of China, Qingdao, China
| | - Lin-Xuan Ma
- Key Laboratory of Mariculture, Ministry of Education, Fisheries College, Ocean University of China, Qingdao, China
| | - Yun-Wei Dong
- Key Laboratory of Mariculture, Ministry of Education, Fisheries College, Ocean University of China, Qingdao, China
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3
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Chaiyasing R, Jinagool P, Wipassa V, Kusolrat P, Aengwanich W. Impact of rising temperature on physiological and biochemical alterations that affect the viability of blood cells in American bullfrog crossbreeds. Heliyon 2024; 10:e32416. [PMID: 38933952 PMCID: PMC11200338 DOI: 10.1016/j.heliyon.2024.e32416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2024] [Revised: 06/01/2024] [Accepted: 06/04/2024] [Indexed: 06/28/2024] Open
Abstract
The study aimed to examine the impact of increasing environmental temperatures on physiological changes, oxidative stress, nitric oxide production, total antioxidant capacity, and blood cell viability in American bullfrog crossbreeds. Frogs and frog blood cells were exposed to temperature ranges of 25-33 °C and 25-37 °C, respectively. Physiological parameters (body temperature, pulse rate, ventilation rate, and oxygen saturation) and biochemical parameters (total antioxidant power, hydrogen peroxide, malondialdehyde, nitric oxide, and mitochondrial activity) were measured at every 2 °C increment. Results showed that body temperature rose with increased environmental temperature (P < 0.05). Pulse rates at 33 °C were higher than those at 25-31 °C (P < 0.05). Ventilation rates at 31 °C exceeded those at 25 °C and 27 °C (P < 0.05). Oxygen saturation levels remained stable at 25-33 °C (P > 0.05). Total antioxidant power at 25 °C was greater than at 27-37 °C (P < 0.05). Hydrogen peroxide levels at 27 °C were higher compared to 25 °C and 31-37 °C (P < 0.05). Malondialdehyde levels at 25-33 °C were higher than at 35 °C and 37 °C (P < 0.05). Nitric oxide levels at 37 °C were higher than at 25-33 °C (P < 0.05), and at 35 °C were higher than at 25-31 °C (P < 0.05). Blood cell viability at 25-31 °C was higher than at 37 °C (P < 0.05). These results suggest that at an environmental temperature of 33 °C, the frogs' body temperature approached 31 °C or higher, and were likely to be harmful to the frogs. Finally, the environmental temperature that caused frog blood cell death was 37 °C.
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Affiliation(s)
| | - Pailin Jinagool
- Stress and Oxidative Stress in Animal Research Unit of Mahasarakham University, Thailand
- Faculty of Veterinary Sciences, Mahasarakham University, Mahasarakham, 44000, Thailand
| | - Vajara Wipassa
- Faculty of Veterinary Sciences, Mahasarakham University, Mahasarakham, 44000, Thailand
| | - Prayuth Kusolrat
- Faculty of Science and Technology, Nakhonratchasima Rajabhat University, Nakhonratchasima, 30000, Thailand
| | - Worapol Aengwanich
- Stress and Oxidative Stress in Animal Research Unit of Mahasarakham University, Thailand
- Faculty of Veterinary Sciences, Mahasarakham University, Mahasarakham, 44000, Thailand
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4
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Tuckett QM, Hill JE, Everett K, Goodman C, Wooley ES, Durland Donahou A, Lapham L, Buckman K, Johnson S, Romagosa C. Thermal tolerance for the tropical clawed frog, Xenopus tropicalis with comments on comparative methods for amphibian studies. J Therm Biol 2024; 123:103890. [PMID: 38879911 DOI: 10.1016/j.jtherbio.2024.103890] [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: 12/15/2023] [Revised: 06/03/2024] [Accepted: 06/10/2024] [Indexed: 06/18/2024]
Abstract
Thermal tolerance data are important for identifying the potential range of non-native species following introduction and establishment. Such data are particularly important for understanding invasion risks of tropical species introduced to temperate climates and identifying whether they can survive outside tropical regions. A breeding population of the tropical clawed frog (Xenopus tropicalis) was recently discovered in west-central Florida, U.S.A. This fully aquatic species is native to the rainforest belt of west Africa and has not been documented outside its native range. Because of the lack of invasion history, data are sparse on the thermal limits for this species. We used chronic lethal and critical thermal methodologies to investigate thermal tolerance on adult stages and critical thermal methods on tadpoles. Because of our use of both chronic and critical methodologies, we also examined the literature to reveal common methods used to investigate thermal minimum and maximum temperature in amphibians, which were found to be dominated by the critical maximum. Chronic lethal temperatures for adult X. tropicalis were 9.73 °C and 36.68 °C. Critical temperatures were affected by acclimation temperature and life stage; adults were more tolerant of extreme temperatures. Based on these critical thermal data and the fact that breeding tends to occur when temperatures are suitable for survival, tadpole stages are unlikely to be affected by extreme temperatures. Instead, range expansion in Florida will likely be limited by the adult stages. Our findings indicate that the tropical clawed frog could occupy much of southern Peninsular Florida and other tropical and subtropical regions worldwide.
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Affiliation(s)
- Quenton M Tuckett
- University of Florida, Tropical Aquaculture Laboratory, Program in Fisheries and Aquatic Sciences, School of Forest, Fisheries, and Geomatics Sciences, 1408 24th Street SE, Ruskin, FL, 33570, USA.
| | - Jeffrey E Hill
- University of Florida, Tropical Aquaculture Laboratory, Program in Fisheries and Aquatic Sciences, School of Forest, Fisheries, and Geomatics Sciences, 1408 24th Street SE, Ruskin, FL, 33570, USA
| | - Katie Everett
- University of Florida, Tropical Aquaculture Laboratory, Program in Fisheries and Aquatic Sciences, School of Forest, Fisheries, and Geomatics Sciences, 1408 24th Street SE, Ruskin, FL, 33570, USA
| | - Colin Goodman
- University of Florida, Department of Wildlife Ecology and Conservation, Gainesville, FL, 32611, USA
| | - Emily S Wooley
- University of Florida, Tropical Aquaculture Laboratory, Program in Fisheries and Aquatic Sciences, School of Forest, Fisheries, and Geomatics Sciences, 1408 24th Street SE, Ruskin, FL, 33570, USA
| | - Allison Durland Donahou
- University of Florida, Tropical Aquaculture Laboratory, Program in Fisheries and Aquatic Sciences, School of Forest, Fisheries, and Geomatics Sciences, 1408 24th Street SE, Ruskin, FL, 33570, USA
| | - Lauren Lapham
- University of Florida, Tropical Aquaculture Laboratory, Program in Fisheries and Aquatic Sciences, School of Forest, Fisheries, and Geomatics Sciences, 1408 24th Street SE, Ruskin, FL, 33570, USA
| | - Katherine Buckman
- University of Florida, Department of Wildlife Ecology and Conservation, Gainesville, FL, 32611, USA
| | - Steve Johnson
- University of Florida, Department of Wildlife Ecology and Conservation, Gainesville, FL, 32611, USA
| | - Christina Romagosa
- University of Florida, Department of Wildlife Ecology and Conservation, Gainesville, FL, 32611, USA
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Ruthsatz K, Dahlke F, Alter K, Wohlrab S, Eterovick PC, Lyra ML, Gippner S, Cooke SJ, Peck MA. Acclimation capacity to global warming of amphibians and freshwater fishes: Drivers, patterns, and data limitations. GLOBAL CHANGE BIOLOGY 2024; 30:e17318. [PMID: 38771091 DOI: 10.1111/gcb.17318] [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] [Received: 12/23/2023] [Revised: 04/17/2024] [Accepted: 04/26/2024] [Indexed: 05/22/2024]
Abstract
Amphibians and fishes play a central role in shaping the structure and function of freshwater environments. These organisms have a limited capacity to disperse across different habitats and the thermal buffer offered by freshwater systems is small. Understanding determinants and patterns of their physiological sensitivity across life history is, therefore, imperative to predicting the impacts of climate change in freshwater systems. Based on a systematic literature review including 345 experiments with 998 estimates on 96 amphibian (Anura/Caudata) and 93 freshwater fish species (Teleostei), we conducted a quantitative synthesis to explore phylogenetic, ontogenetic, and biogeographic (thermal adaptation) patterns in upper thermal tolerance (CTmax) and thermal acclimation capacity (acclimation response ratio, ARR) as well as the influence of the methodology used to assess these thermal traits using a conditional inference tree analysis. We found globally consistent patterns in CTmax and ARR, with phylogeny (taxa/order), experimental methodology, climatic origin, and life stage as significant determinants of thermal traits. The analysis demonstrated that CTmax does not primarily depend on the climatic origin but on experimental acclimation temperature and duration, and life stage. Higher acclimation temperatures and longer acclimation times led to higher CTmax values, whereby Anuran larvae revealed a higher CTmax than older life stages. The ARR of freshwater fishes was more than twice that of amphibians. Differences in ARR between life stages were not significant. In addition to phylogenetic differences, we found that ARR also depended on acclimation duration, ramping rate, and adaptation to local temperature variability. However, the amount of data on early life stages is too small, methodologically inconsistent, and phylogenetically unbalanced to identify potential life cycle bottlenecks in thermal traits. We, therefore, propose methods to improve the robustness and comparability of CTmax/ARR data across species and life stages, which is crucial for the conservation of freshwater biodiversity under climate change.
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Affiliation(s)
- Katharina Ruthsatz
- Zoological Institute, Technische Universität Braunschweig, Braunschweig, Germany
- Institute of Animal Cell and Systems Biology, Universität Hamburg, Hamburg, Germany
| | - Flemming Dahlke
- Ecology of Living Marine Resources, Universität Hamburg, Hamburg, Germany
| | - Katharina Alter
- Department of Coastal Systems, Royal Netherlands Institute for Sea Research, Den Burg, The Netherlands
| | - Sylke Wohlrab
- Alfred Wegner Institute Helmholtz Center for Polar and Marine Research, Bremerhaven, Germany
- Helmholtz Institute for Functional Marine Biodiversity at the University of Oldenburg (HIFMB), Oldenburg, Germany
| | - Paula C Eterovick
- Zoological Institute, Technische Universität Braunschweig, Braunschweig, Germany
| | - Mariana L Lyra
- New York University Abu Dhabi, Abu Dhabi, United Arab Emirates
- Center for Research on Biodiversity Dynamics and Climate Change, State University of São Paulo-UNESP, Rio Claro, Brazil
| | - Sven Gippner
- Zoological Institute, Technische Universität Braunschweig, Braunschweig, Germany
| | - Steven J Cooke
- Fish Ecology and Conservation Physiology Laboratory, Department of Biology and Institute of Environmental and Interdisciplinary Science, Carleton University, Ottawa, Ontario, Canada
| | - Myron A Peck
- Department of Coastal Systems, Royal Netherlands Institute for Sea Research, Den Burg, The Netherlands
- Marine Animal Ecology Group, Department of Animal Sciences, Wageningen University, Wageningen, The Netherlands
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6
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Bock DG, Baeckens S, Kolbe JJ, Losos JB. When adaptation is slowed down: Genomic analysis of evolutionary stasis in thermal tolerance during biological invasion in a novel climate. Mol Ecol 2024; 33:e17075. [PMID: 37489260 DOI: 10.1111/mec.17075] [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: 01/30/2023] [Revised: 06/25/2023] [Accepted: 07/04/2023] [Indexed: 07/26/2023]
Abstract
Research conducted during the past two decades has demonstrated that biological invasions are excellent models of rapid evolution. Even so, characteristics of invasive populations such as a short time for recombination to assemble optimal combinations of alleles may occasionally limit adaptation to new environments. Here, we investigated such genetic constraints to adaptation in the invasive brown anole (Anolis sagrei)-a tropical ectotherm that was introduced to the southeastern United States, a region with a much colder climate than in its native Caribbean range. We examined thermal physiology for 30 invasive populations and tested for a climatic cline in cold tolerance. Also, we used genomics to identify mechanisms that may limit adaptation. We found no support for a climatic cline, indicating that thermal tolerance did not shift adaptively. Concomitantly, population genomic results were consistent with the occurrence of recombination cold spots that comprise more than half of the genome and maintain long-range associations among alleles in invasive populations. These genomic regions overlap with both candidate thermal tolerance loci that we identified using a standard genome-wide association test. Moreover, we found that recombination cold spots do not have a large contribution to population differentiation in the invasive range, contrary to observations in the native range. We suggest that limited recombination is constraining the contribution of large swaths of the genome to adaptation in invasive brown anoles. Our study provides an example of evolutionary stasis during invasion and highlights the possibility that reduced recombination occasionally slows down adaptation in invasive populations.
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Affiliation(s)
- Dan G Bock
- Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts, USA
- Department of Biology, Washington University, St. Louis, Missouri, USA
| | - Simon Baeckens
- Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts, USA
- Evolution and Optics of Nanostructures Lab, Department of Biology, Ghent University, Ghent, Belgium
- Functional Morphology Lab, Department of Biology, University of Antwerp, Antwerp, Belgium
| | - Jason J Kolbe
- Department of Biological Sciences, University of Rhode Island, Kingston, Rhode Island, USA
| | - Jonathan B Losos
- Department of Biology, Washington University, St. Louis, Missouri, USA
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7
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Gunderson AR. Disentangling physiological and physical explanations for body size-dependent thermal tolerance. J Exp Biol 2024; 227:jeb245645. [PMID: 38426549 DOI: 10.1242/jeb.245645] [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] [Indexed: 03/02/2024]
Abstract
The effects of climate change are often body size dependent. One contributing factor could be size-dependent thermal tolerance (SDTT), the propensity for heat and cold tolerance to vary with body size among species and among individuals within species. SDTT is hypothesized to be caused by size differences in the temperature dependence of underlying physiological processes that operate at the cellular and organ/system level (physiological SDTT). However, temperature-dependent physiology need not change with body size for SDTT to be observed. SDTT can also arise because of physical differences that affect the relative body temperature dynamics of large and small organisms (physical SDTT). In this Commentary, I outline how physical SDTT occurs, its mechanistic differences from physiological SDTT, and how physical and physiological SDTT make different predictions about organismal responses to thermal variation. I then describe how physical SDTT can influence the outcome of thermal tolerance experiments, present an experimental framework for disentangling physical and physiological SDTT, and provide examples of tests for physiological SDTT that control for physical effects using data from Anolis lizards. Finally, I discuss how physical SDTT can affect organisms in natural environments and influence their vulnerability to anthropogenic warming. Differentiating between physiological and physical SDTT is important because it has implications for how we design and interpret thermal tolerance experiments and our fundamental understanding of thermal ecology and thermal adaptation.
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Affiliation(s)
- Alex R Gunderson
- Department of Ecology & Evolutionary Biology, Tulane University, 6823 St Charles Avenue, Lindy Boggs Building Room 400, New Orleans, LA 70118-5698, USA
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8
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Tobias Z, Solow A, Tepolt C. Geography and developmental plasticity shape post-larval thermal tolerance in the golden star tunicate, Botryllus schlosseri. J Therm Biol 2024; 119:103763. [PMID: 38071896 DOI: 10.1016/j.jtherbio.2023.103763] [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] [Received: 09/27/2023] [Revised: 10/26/2023] [Accepted: 11/19/2023] [Indexed: 02/25/2024]
Abstract
Local adaptation and phenotypic plasticity play key roles in mediating organisms' ability to respond to spatiotemporal variation in temperature. These two processes often act together to generate latitudinal or elevational clines in acute temperature tolerance. Phenotypic plasticity is also subject to local adaptation, with the expectation that populations inhabiting more variable environments should exhibit greater phenotypic plasticity of thermal tolerance. Here we examine the potential for local adaptation and developmental plasticity of thermal tolerance in the widespread invasive tunicate Botryllus schlosseri. By comparing five populations across a thermal gradient spanning 4.4° of latitude in the northwest Atlantic, we demonstrate that warmer populations south of the Gulf of Maine exhibit significantly increased (∼0.2 °C) post-larval temperature tolerance relative to the colder populations within it. We also show that B. schlosseri post-larvae possess a high degree of developmental plasticity for this trait, shifting their median temperature of survival (LT50) upwards by as much as 0.18 °C per 1 °C increase in environmental temperature. Lastly, we found that populations vary in their degrees of developmental plasticity, with populations that experience more pronounced short-term temperature variability exhibiting greater developmental plasticity, suggesting the local adaptation of developmental plasticity. By comparing the thermal tolerance of populations across space and through time, we demonstrate how geography and developmental plasticity have shaped thermal tolerance in B. schlosseri. These results help inform our understanding of how species are able to adjust their thermal physiology in new environments, including those encountered during invasion and under increasingly novel climate conditions.
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Affiliation(s)
- Zachary Tobias
- MIT-WHOI Joint Program in Oceanography/Applied Ocean Science and Engineering, Cambridge and Woods Hole, MA, USA; Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA; Biology Department, Woods Hole Oceanographic Institution, Woods Hole, MA, USA.
| | - Andrew Solow
- Marine Policy Center, Woods Hole Oceanographic Institution, Woods Hole, MA, USA
| | - Carolyn Tepolt
- Biology Department, Woods Hole Oceanographic Institution, Woods Hole, MA, USA
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9
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Medina-Báez OA, Lenard A, Muzychuk RA, da Silva CRB, Diamond SE. Life cycle complexity and body mass drive erratic changes in climate vulnerability across ontogeny in a seasonally migrating butterfly. CONSERVATION PHYSIOLOGY 2023; 11:coad058. [PMID: 37547363 PMCID: PMC10401068 DOI: 10.1093/conphys/coad058] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 06/26/2023] [Accepted: 07/19/2023] [Indexed: 08/08/2023]
Abstract
Physiological traits are often used for vulnerability assessments of organismal responses to climate change. Trait values can change dramatically over the life cycle of organisms but are typically assessed at a single developmental stage. Reconciling ontogenetic changes in physiological traits with vulnerability assessments often reveals early life-stage vulnerabilities. The degree to which ontogenetic changes in physiological traits are due to changes in body mass over development versus stage-specific responses determines the degree to which mass can be used as a proxy for vulnerability. Here, we use the painted lady butterfly, Vanessa cardui, to test ontogenetic changes in two physiological traits, the acute thermal sensitivity of routine metabolic rate (RMR Q10) and the critical thermal maximum (CTmax). RMR Q10 generally followed ontogenetic changes in body mass, with stages characterized by smaller body mass exhibiting lower acute thermal sensitivity. However, CTmax was largely decoupled from ontogenetic changes in body mass. In contrast with trends from other studies showing increasing vulnerability among progressively earlier developmental stages, our study revealed highly erratic patterns of vulnerability across ontogeny. Specifically, we found the lowest joint-trait vulnerability (both RMR Q10 and CTmax) in the earliest developmental stage we tested (3rd instar larvae), the highest vulnerabilities in the next two developmental stages (4th and 5th instar larvae), and reduced vulnerability into the pupal and adult stages. Our study supports growing evidence of mechanistic decoupling of physiology across developmental stages and suggests that body mass is not a universal proxy for all physiological trait indicators of climate vulnerability.
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Affiliation(s)
- Osmary A Medina-Báez
- Corresponding author: Department of Biology, Case Western Reserve University, Cleveland, OH 44106, USA. Tel: 1-216-368-0699.
| | - Angie Lenard
- Department of Biology, Case Western Reserve University, 2074 Adelbert Rd, Cleveland, OH 44106, USA
| | - Rut A Muzychuk
- Department of Biology, Case Western Reserve University, 2074 Adelbert Rd, Cleveland, OH 44106, USA
| | - Carmen R B da Silva
- Department of Biology, Case Western Reserve University, 2074 Adelbert Rd, Cleveland, OH 44106, USA
- School of Biological Sciences, Monash University, 25 Rainforest Walk, Clayton 3800, Australia
- College of Science and Engineering, Flinders University, Anchor Court, Bedford Park 5042, South Australia, Australia
| | - Sarah E. Diamond
- Department of Biology, Case Western Reserve University, 2074 Adelbert Rd, Cleveland, OH 44106, USA
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10
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Rollins-Smith LA, Le Sage EH. Heat stress and amphibian immunity in a time of climate change. Philos Trans R Soc Lond B Biol Sci 2023; 378:20220132. [PMID: 37305907 PMCID: PMC10258666 DOI: 10.1098/rstb.2022.0132] [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: 01/05/2023] [Accepted: 03/28/2023] [Indexed: 06/13/2023] Open
Abstract
As a class of vertebrates, amphibians, are at greater risk for declines or extinctions than any other vertebrate group, including birds and mammals. There are many threats, including habitat destruction, invasive species, overuse by humans, toxic chemicals and emerging diseases. Climate change which brings unpredictable temperature changes and rainfall constitutes an additional threat. Survival of amphibians depends on immune defences functioning well under these combined threats. Here, we review the current state of knowledge of how amphibians respond to some natural stressors, including heat and desiccation stress, and the limited studies of the immune defences under these stressful conditions. In general, the current studies suggest that desiccation and heat stress can activate the hypothalamus pituitary-interrenal axis, with possible suppression of some innate and lymphocyte-mediated responses. Elevated temperatures can alter microbial communities in amphibian skin and gut, resulting in possible dysbiosis that fosters reduced resistance to pathogens. This article is part of the theme issue 'Amphibian immunity: stress, disease and ecoimmunology'.
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Affiliation(s)
- Louise A. Rollins-Smith
- Department of Pathology, Microbiology and Immunology, Vanderbilt University School of Medicine, Nashville, TN 37232, USA
| | - Emily H. Le Sage
- Department of Pathology, Microbiology and Immunology, Vanderbilt University School of Medicine, Nashville, TN 37232, USA
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11
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Nolan N, Hayward MW, Klop-Toker K, Mahony M, Lemckert F, Callen A. Complex Organisms Must Deal with Complex Threats: How Does Amphibian Conservation Deal with Biphasic Life Cycles? Animals (Basel) 2023; 13:ani13101634. [PMID: 37238064 DOI: 10.3390/ani13101634] [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: 04/14/2023] [Revised: 05/08/2023] [Accepted: 05/11/2023] [Indexed: 05/28/2023] Open
Abstract
The unprecedented rate of global amphibian decline is attributed to The Anthropocene, with human actions triggering the Sixth Mass Extinction Event. Amphibians have suffered some of the most extreme declines, and their lack of response to conservation actions may reflect challenges faced by taxa that exhibit biphasic life histories. There is an urgent need to ensure that conservation measures are cost-effective and yield positive outcomes. Many conservation actions have failed to meet their intended goals of bolstering populations to ensure the persistence of species into the future. We suggest that past conservation efforts have not considered how different threats influence multiple life stages of amphibians, potentially leading to suboptimal outcomes for their conservation. Our review highlights the multitude of threats amphibians face at each life stage and the conservation actions used to mitigate these threats. We also draw attention to the paucity of studies that have employed multiple actions across more than one life stage. Conservation programs for biphasic amphibians, and the research that guides them, lack a multi-pronged approach to deal with multiple threats across the lifecycle. Conservation management programs must recognise the changing threat landscape for biphasic amphibians to reduce their notoriety as the most threatened vertebrate taxa globally.
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Affiliation(s)
- Nadine Nolan
- Conservation Science Research Group, School of Environmental and Life Sciences, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Matthew W Hayward
- Conservation Science Research Group, School of Environmental and Life Sciences, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Kaya Klop-Toker
- Conservation Science Research Group, School of Environmental and Life Sciences, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Michael Mahony
- Conservation Science Research Group, School of Environmental and Life Sciences, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Frank Lemckert
- Eco Logical Australia Pty Ltd., Perth, WA 6000, Australia
| | - Alex Callen
- Conservation Science Research Group, School of Environmental and Life Sciences, University of Newcastle, Callaghan, NSW 2308, Australia
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12
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Turriago JL, Tejedo M, Hoyos JM, Camacho A, Bernal MH. The time course of acclimation of critical thermal maxima is modulated by the magnitude of temperature change and thermal daily fluctuations. J Therm Biol 2023; 114:103545. [PMID: 37290261 DOI: 10.1016/j.jtherbio.2023.103545] [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: 01/17/2023] [Revised: 03/09/2023] [Accepted: 03/12/2023] [Indexed: 06/10/2023]
Abstract
Plasticity in the critical thermal maximum (CTmax) helps ectotherms survive in variable thermal conditions. Yet, little is known about the environmental mechanisms modulating its time course. We used the larvae of three neotropical anurans (Boana platanera, Engystomops pustulosus and Rhinella horribilis) to test whether the magnitude of temperature changes and the existence of fluctuations in the thermal environment affected both the amount of change in CTmax and its acclimation rate (i.e., its time course). For that, we transferred tadpoles from a pre-treatment temperature (23 °C, constant) to two different water temperatures: mean (28 °C) and hot (33 °C), crossed with constant and daily fluctuating thermal regimes, and recorded CTmax values, daily during six days. We modeled changes in CTmax as an asymptotic function of time, temperature, and the daily thermal fluctuation. The fitted function provided the asymptotic CTmax value (CTmax∞) and CTmax acclimation rate (k). Tadpoles achieved their CTmax∞ between one and three days. Transferring tadpoles to the hot treatment generated higher CTmax∞ at earlier times, inducing faster acclimation rates in tadpoles. In contrast, thermal fluctuations equally led to higher CTmax∞ values but tadpoles required longer times to achieve CTmax∞ (i.e., slower acclimation rates). These thermal treatments interacted differently with the studied species. In general, the thermal generalist Rhinella horribilis showed the most plastic acclimation rates whereas the ephemeral-pond breeder Engystomops pustulosus, more exposed to heat peaks during larval development, showed less plastic (i.e., canalized) acclimation rates. Further comparative studies of the time course of CTmax acclimation should help to disentangle the complex interplay between the thermal environment and species ecology, to understand how tadpoles acclimate to heat stress.
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Affiliation(s)
- Jorge L Turriago
- Grupo de Herpetología, Eco-Fisiología & Etología, Department of Biology, Universidad del Tolima, Tolima, 730006299, Colombia; Programa Doctorado en Ciencias Biológicas, Pontificia Universidad Javeriana, Bogotá, 11001000, Colombia.
| | - Miguel Tejedo
- Department of Evolutionary Ecology, Estación Biológica de Doñana, CSIC, Sevilla, 41092, Spain.
| | - Julio M Hoyos
- Grupo UNESIS, Department of Biology, Pontificia Universidad Javeriana, Bogotá, 11001000, Colombia.
| | - Agustín Camacho
- Department of Evolutionary Ecology, Estación Biológica de Doñana, CSIC, Sevilla, 41092, Spain.
| | - Manuel H Bernal
- Grupo de Herpetología, Eco-Fisiología & Etología, Department of Biology, Universidad del Tolima, Tolima, 730006299, Colombia.
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13
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Dallas J, Warne RW. Heat hardening of a larval amphibian is dependent on acclimation period and temperature. JOURNAL OF EXPERIMENTAL ZOOLOGY. PART A, ECOLOGICAL AND INTEGRATIVE PHYSIOLOGY 2023; 339:339-345. [PMID: 36811331 DOI: 10.1002/jez.2689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Revised: 02/03/2023] [Accepted: 02/09/2023] [Indexed: 02/24/2023]
Abstract
Plasticity in heat tolerance provides ectotherms the ability to reduce overheating risk during thermal extremes. However, the tolerance-plasticity trade-off hypothesis states that individuals acclimated to warmer environments have a reduced plastic response, including hardening, limiting their ability to further adjust their thermal tolerance. Heat hardening describes the short-term increase in heat tolerance following a heat shock that remains understudied in larval amphibians. We sought to examine the potential trade-off between basal heat tolerance and hardening plasticity of a larval amphibian, Lithobates sylvaticus, in response to differing acclimation temperatures and periods. Lab-reared larvae were exposed to one of two acclimation temperatures (15°C and 25°C) for either 3 or 7 days, at which time heat tolerance was measured as critical thermal maximum (CTmax ). A hardening treatment (sub-critical temperature exposure) was applied 2 h before the CTmax assay for comparison to control groups. We found that heat-hardening effects were most pronounced in 15°C acclimated larvae, particularly after 7 days of acclimation. By contrast, larvae acclimated to 25°C exhibited only minor hardening responses, while basal heat tolerance was significantly increased as shown by elevated CTmax temperatures. These results are in line with the tolerance-plasticity trade-off hypothesis. Specifically, while exposure to elevated temperatures induces acclimation in basal heat tolerance, shifts towards upper thermal tolerance limits constrain the capacity for ectotherms to further respond to acute thermal stress.
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Affiliation(s)
- Jason Dallas
- School of Biological Sciences, Southern Illinois University, Carbondale, Illinois, USA
| | - Robin W Warne
- School of Biological Sciences, Southern Illinois University, Carbondale, Illinois, USA
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14
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Slein MA, Bernhardt JR, O'Connor MI, Fey SB. Effects of thermal fluctuations on biological processes: a meta-analysis of experiments manipulating thermal variability. Proc Biol Sci 2023; 290:20222225. [PMID: 36750193 PMCID: PMC9904952 DOI: 10.1098/rspb.2022.2225] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023] Open
Abstract
Thermal variability is a key driver of ecological processes, affecting organisms and populations across multiple temporal scales. Despite the ubiquity of variation, biologists lack a quantitative synthesis of the observed ecological consequences of thermal variability across a wide range of taxa, phenotypic traits and experimental designs. Here, we conduct a meta-analysis to investigate how properties of organisms, their experienced thermal regime and whether thermal variability is experienced in either the past (prior to an assay) or present (during the assay) affect performance relative to the performance of organisms experiencing constant thermal environments. Our results-which draw upon 1712 effect sizes from 75 studies-indicate that the effects of thermal variability are not unidirectional and become more negative as mean temperature and fluctuation range increase. Exposure to variation in the past decreases performance to a greater extent than variation experienced in the present and increases the costs to performance more than diminishing benefits across a broad set of empirical studies. Further, we identify life-history attributes that predictably modify the ecological response to variation. Our findings demonstrate that effects of thermal variability on performance are context-dependent, yet negative outcomes may be heightened in warmer, more variable climates.
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Affiliation(s)
- Margaret A. Slein
- Department of Biology, Reed College, Portland, OR 97202, USA,Department of Zoology and Biodiversity Research Centre, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z4
| | - Joey R. Bernhardt
- Department of Ecology and Evolutionary Biology, Yale University, 165 Prospect Street, New Haven, CT 06520, USA,Yale Institute for Biospheric Studies, PO Box 208118, New Haven, CT 06520, USA,Department of Integrative Biology, University of Guelph, Guelph, Ontario, Canada N1G 2W1
| | - Mary I. O'Connor
- Department of Zoology and Biodiversity Research Centre, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z4
| | - Samuel B. Fey
- Department of Biology, Reed College, Portland, OR 97202, USA
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15
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Petrović TG, Vučić T, Burraco P, Gavrilović BR, Despotović SG, Gavrić JP, Radovanović TB, Šajkunić S, Ivanović A, Prokić MD. Higher temperature induces oxidative stress in hybrids but not in parental species: A case study of crested newts. J Therm Biol 2023; 112:103474. [PMID: 36796919 DOI: 10.1016/j.jtherbio.2023.103474] [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: 09/06/2022] [Revised: 12/11/2022] [Accepted: 12/28/2022] [Indexed: 01/11/2023]
Abstract
Ectotherms are particularly sensitive to global warming due to their limited capacity to thermoregulate, which can impact their performance and fitness. From a physiological standpoint, higher temperatures often enhance biological processes that can induce the production of reactive oxygen species and result in a state of cellular oxidative stress. Temperature alters interspecific interactions, including species hybridization. Hybridization under different thermal conditions could amplify parental (genetic) incompatibilities, thus affecting a hybrid's development and distribution. Understanding the impact of global warming on the physiology of hybrids and particularly their oxidative status could help in predicting future scenarios in ecosystems and in hybrids. In the present study, we investigated the effect of water temperature on the development, growth and oxidative stress of two crested newt species and their reciprocal hybrids. Larvae of Triturus macedonicus and T. ivanbureschi, and their T. macedonicus-mothered and T. ivanbureschi-mothered hybrids were exposed for 30 days to temperatures of 19°C and 24°C. Under the higher temperature, the hybrids experienced increases in both growth and developmental rates, while parental species exhibited accelerated growth (T. macedonicus) or development (T. ivanbureschi). Warm conditions also had different effects on the oxidative status of hybrid and parental species. Parental species had enhanced antioxidant responses (catalase, glutathione peroxidase, glutathione S-transferase and SH groups), which allowed them to alleviate temperature-induced stress (revealed by the absence of oxidative damage). However, warming induced an antioxidant response in the hybrids, including oxidative damage in the form of lipid peroxidation. These findings point to a greater disruption of redox regulation and metabolic machinery in hybrid newts, which can be interpreted as the cost of hybridization that is likely linked to parental incompatibilities expressed under a higher temperature. Our study aims to improve mechanistic understanding of the resilience and distribution of hybrid species that cope with climate-driven changes.
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Affiliation(s)
- Tamara G Petrović
- Department of Physiology, Institute for Biological Research "Siniša Stanković", National Institute of the Republic of Serbia, University of Belgrade, Bulevar despota Stefana 142, 11060, Belgrade, Serbia.
| | - Tijana Vučić
- Faculty of Biology, Institute of Zoology, University of Belgrade, Studentski trg 16, 11000, Belgrade, Serbia; Institute of Biology Leiden, Leiden University, Sylviusweg 72, 2333 BE, Leiden, the Netherlands; Naturalis Biodiversity Center, Darwinweg 2, 2333 CR, Leiden, the Netherlands.
| | - Pablo Burraco
- Doñana Biological Station (CSIC), C/ Americo Vespucci 26, 41092, Seville, Spain.
| | - Branka R Gavrilović
- Department of Physiology, Institute for Biological Research "Siniša Stanković", National Institute of the Republic of Serbia, University of Belgrade, Bulevar despota Stefana 142, 11060, Belgrade, Serbia.
| | - Svetlana G Despotović
- Department of Physiology, Institute for Biological Research "Siniša Stanković", National Institute of the Republic of Serbia, University of Belgrade, Bulevar despota Stefana 142, 11060, Belgrade, Serbia.
| | - Jelena P Gavrić
- Department of Physiology, Institute for Biological Research "Siniša Stanković", National Institute of the Republic of Serbia, University of Belgrade, Bulevar despota Stefana 142, 11060, Belgrade, Serbia.
| | - Tijana B Radovanović
- Department of Physiology, Institute for Biological Research "Siniša Stanković", National Institute of the Republic of Serbia, University of Belgrade, Bulevar despota Stefana 142, 11060, Belgrade, Serbia.
| | - Sanja Šajkunić
- Department of Plant Physiology, Institute for Biological Research "Siniša Stanković", National Institute of the Republic of Serbia, University of Belgrade, Bulevar despota Stefana 142, 11060, Belgrade, Serbia.
| | - Ana Ivanović
- Faculty of Biology, Institute of Zoology, University of Belgrade, Studentski trg 16, 11000, Belgrade, Serbia.
| | - Marko D Prokić
- Department of Physiology, Institute for Biological Research "Siniša Stanković", National Institute of the Republic of Serbia, University of Belgrade, Bulevar despota Stefana 142, 11060, Belgrade, Serbia.
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16
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Tong Q, Dong WJ, Long XZ, Hu ZF, Luo ZW, Guo P, Cui LY. Effects of fine-scale habitat quality on activity, dormancy, habitat use, and survival after reproduction in Rana dybowskii (Chordata, Amphibia). BMC ZOOL 2023; 8:1. [PMID: 37170169 PMCID: PMC10127375 DOI: 10.1186/s40850-022-00163-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Accepted: 12/20/2022] [Indexed: 01/19/2023] Open
Abstract
AbstractAmphibians are facing population declines and extinctions, and protecting and supplementing refuges can help species survive. However, the microhabitat requirements of most species are unknown, and artificial shelters or burrows have not been well tested for amphibians. Some amphibians exhibit complex behaviour during the transition from post-reproductive dormancy to activity. However, little is known about the ecology, post-reproductive dormancy, and terrestrial activity of amphibians. Here, habitat site selection in experimental enclosures and the effects of shelters (stones, soil) and shade (with and without shade netting) on the activity, exposed body percentage, burrow depth, body-soil contact percentage, and survival of Rana dybowskii were investigated during post-reproductive dormancy and post-dormant activity. The results showed that R. dybowskii live individually under leaves, soil, stones or tree roots. Furthermore, although the dormant sites of frogs are significantly different, the distribution of male and female frogs in these sites is similar. Shading and shelter significantly affected the exposed body percentage, burrow depth and body-soil contact percentage of frogs compared with soil. In the stone group, soil and stone form the frog's refuge/burrow, whereas in the soil group, the refuge/burrow is composed entirely of soil. Even though the soil group has a deeper burrow and a larger area of soil contact with the body, it still has a higher exposure rate than the stone group. Frog activity frequency was affected by shelter and shade; the interaction of shelter and time and the interaction of shading and time were significant. The soil group had a higher activity frequency than the stone group, and the no-shade group had a higher activity frequency than the shade group. Shelter and shading differences do not significantly affect frog survival; however, the death rate during post-reproductive dormancy is lower than that during the active period.
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17
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Montori A, Amat F. Surviving on the edge: present and future effects of climate warming on the common frog ( Rana temporaria) population in the Montseny massif (NE Iberia). PeerJ 2023; 11:e14527. [PMID: 36655044 PMCID: PMC9841900 DOI: 10.7717/peerj.14527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Accepted: 11/15/2022] [Indexed: 01/15/2023] Open
Abstract
The Montseny massif shelters the southernmost western populations of common frogs (Rana temporaria) that live in a Mediterranean climate, one which poses a challenge for the species' persistence in a scenario of rising temperatures. We evaluated the effect of climate change at three levels. First, we analysed if there has been an advancement in the onset of spawning period due to the increase in temperatures. Second, we analysed the impact of climatic variables on the onset of the spawning period and, third, how the distribution of this species could vary according to the predictions with regard to rising temperatures for the end of this century. From 2009 to 2021, we found there had been an increase in temperatures of 0.439 °C/decade, more than the 0.1 °C indicated by estimates for the second half of the previous century. We found an advancement in the onset of the reproduction process of 26 days/decade for the period 2009-2022, a change that has been even more marked during the last eight years, when data were annually recorded. Minimum temperatures and the absence of frost days in the week prior to the onset of the spawning period determine the start of reproduction. Predictions on habitat availability for spawning provided by climatic niche analysis for the period 2021-2100 show a potential contraction of the species range in the Montseny and, remarkably, much isolation from the neighbouring populations.
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Affiliation(s)
- Albert Montori
- Herpetology, Centre de Recerca i Estudis Ambientals de Calafell (CREAC/GRENP), Calafell, Catalonia, Spain
| | - Fèlix Amat
- Herpetological Section (BiBIO), Natural History Museum of Granollers, Granollers, Catalonia, Spain
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18
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Muluvhahothe MM, Joubert E, Foord SH. Thermal tolerance responses of the two-spotted stink bug, Bathycoelia distincta (Hemiptera: Pentatomidae), vary with life stage and the sex of adults. J Therm Biol 2023; 111:103395. [PMID: 36585076 DOI: 10.1016/j.jtherbio.2022.103395] [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: 06/02/2022] [Revised: 10/22/2022] [Accepted: 11/22/2022] [Indexed: 12/09/2022]
Abstract
Temperature tolerance is an essential component of insect fitness, and its understanding can provide a predictive framework for their distribution and abundance. The two-spotted stink bug, Bathycoelia distincta Distant, is a significant pest of macadamia. The main goal of this study was to investigate the thermal tolerance of B. distincta across different life stages. Thermal tolerance indices investigated included critical thermal maximum (CTmax), critical thermal minimum (CTmin), effects of acclimation on CTmax and CTmin at 20, 25, and 30 °C, and rapid heat hardening (RHH), and rapid cold hardening (RCH). The Kruskal-Wallis test was used to explore the effects of life stage and acclimation on CTmax and CTmin and Generalized Linear Models (GLM) for the probability of survival after pre-exposure to RHH at 41 °C for 2 h and RCH at -8 °C for 2 h. CTmax and CTmin varied significantly between life stages at all acclimation temperatures, but CTmin (3.5 °C) varied more than CTmax (2.1 °C). Higher acclimation temperatures resulted in larger variations between life stages for both CTmax and CTmin. A significant acclimation response was observed for the CTmax of instar 2 (1.7 °C) and CTmin of females (2.7 °C) across acclimation temperatures (20-30 °C). Pre-exposure significantly improved the heat and cold survival probability of instar 2 and the cold survival probability of instar 3 and males. The response between life stages was more variable in RCH than in RHH. Instar 2 appeared to be the most thermally plastic life stage of B. distincta. These results suggest that the thermal plastic traits of B. distincta life stages may enable this pest to survive in temperature regimes under the ongoing climate change, with early life stages (except for instar 2) more temperature sensitive than later life stages.
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Affiliation(s)
- Mulalo M Muluvhahothe
- SARChI-Chair on Biodiversity Value and Change, Department of Biological Sciences, Faculty of Science, Engineering and Agriculture, University of Venda, Private Bag X5050, Thohoyandou, 0950, South Africa.
| | - Elsje Joubert
- Levubu Centre for Excellence, PO Box 121, Levubu, 0929, South Africa
| | - Stefan H Foord
- SARChI-Chair on Biodiversity Value and Change, Department of Biological Sciences, Faculty of Science, Engineering and Agriculture, University of Venda, Private Bag X5050, Thohoyandou, 0950, South Africa
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19
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Carilo Filho LM, Gomes L, Katzenberger M, Solé M, Orrico VGD. There and back again: A meta-analytical approach on the influence of acclimation and altitude in the upper thermal tolerance of amphibians and reptiles. Front Ecol Evol 2022. [DOI: 10.3389/fevo.2022.1017255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Realistic predictions about the impacts of climate change onbiodiversity requires gathering ecophysiological data and the critical thermal maxima (CTMax) is the most frequently used index to assess the thermal vulnerability of species. In the present study, we performed a systematic review to understand how acclimation and altitude affect CTMax estimates for amphibian and non-avian reptile species. We retrieved CTMax data for anurans, salamanders, lizards, snakes, and turtles/terrapins. Data allowed to perform a multilevel random effects meta-analysis to answer how acclimation temperature affect CTMax of Anura, Caudata, and Squamata and also meta-regressions to assess the influence of altitude on CTMax of frogs and lizards. Acclimation temperature influenced CTMax estimates of tadpoles, adult anurans, salamanders, and lizards, but not of froglets. In general, the increase in acclimation temperature led to higher CTMax values. Altitudinal bioclimatic gradient had an inverse effect for estimating the CTMax of lizards and anuran amphibians. For lizards, CTMax was positively influenced by the mean temperature of the wettest quarter. For anurans, the relationship is inverse; we recover a trend of decreasing CTMax when max temperature of warmest month and precipitation seasonality increase. There is an urgent need for studies to investigate the thermal tolerance of subsampled groups or even for which we do not have any information such as Gymnophiona, Serpentes, Amphisbaena, and Testudines. Broader phylogenetic coverage is mandatory for more accurate analyses of macroecological and evolutionary patterns for thermal tolerance indices as CTMax.
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20
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Gutiérrez‐Pesquera LM, Tejedo M, Camacho A, Enriquez‐Urzelai U, Katzenberger M, Choda M, Pintanel P, Nicieza AG. Phenology and plasticity can prevent adaptive clines in thermal tolerance across temperate mountains: The importance of the elevation-time axis. Ecol Evol 2022; 12:e9349. [PMID: 36225839 PMCID: PMC9534760 DOI: 10.1002/ece3.9349] [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: 05/10/2022] [Revised: 09/05/2022] [Accepted: 09/07/2022] [Indexed: 11/10/2022] Open
Abstract
Critical thermal limits (CTmax and CTmin) decrease with elevation, with greater change in CTmin, and the risk to suffer heat and cold stress increasing at the gradient ends. A central prediction is that populations will adapt to the prevailing climatic conditions. Yet, reliable support for such expectation is scant because of the complexity of integrating phenotypic, molecular divergence and organism exposure. We examined intraspecific variation of CTmax and CTmin, neutral variation for 11 microsatellite loci, and micro- and macro-temperatures in larvae from 11 populations of the Galician common frog (Rana parvipalmata) across an elevational gradient, to assess (1) the existence of local adaptation through a PST-FST comparison, (2) the acclimation scope in both thermal limits, and (3) the vulnerability to suffer acute heat and cold thermal stress, measured at both macro- and microclimatic scales. Our study revealed significant microgeographic variation in CTmax and CTmin, and unexpected elevation gradients in pond temperatures. However, variation in CTmax and CTmin could not be attributed to selection because critical thermal limits were not correlated to elevation or temperatures. Differences in breeding phenology among populations resulted in exposure to higher and more variable temperatures at mid and high elevations. Accordingly, mid- and high-elevation populations had higher CTmax and CTmin plasticities than lowland populations, but not more extreme CTmax and CTmin. Thus, our results support the prediction that plasticity and phenological shifts may hinder local adaptation, promoting thermal niche conservatism. This may simply be a consequence of a coupled variation of reproductive timing with elevation (the "elevation-time axis" for temperature variation). Mid and high mountain populations of R. parvipalmata are more vulnerable to heat and cool impacts than lowland populations during the aquatic phase. All of this contradicts some of the existing predictions on adaptive thermal clines and vulnerability to climate change in elevational gradients.
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Affiliation(s)
| | - Miguel Tejedo
- Department of Evolutionary EcologyEstación Biológica de Doñana, CSICSevillaSpain
| | - Agustín Camacho
- Department of Evolutionary EcologyEstación Biológica de Doñana, CSICSevillaSpain
| | | | - Marco Katzenberger
- Department of Evolutionary EcologyEstación Biológica de Doñana, CSICSevillaSpain,Laboratory of Bioinformatics and Evolutionary Biology, Department of GeneticsUniversidade Federal de PernambucoRecifePrince Edward IslandBrazil
| | - Magdalena Choda
- Department of Organisms and Systems BiologyUniversity of OviedoOviedoSpain
| | - Pol Pintanel
- Department of Evolutionary EcologyEstación Biológica de Doñana, CSICSevillaSpain,Laboratorio de Ecofisiología and Museo de Zoología (QCAZ), Escuela de Ciencias BiológicasPontificia Universidad Católica del EcuadorQuitoEcuador
| | - Alfredo G. Nicieza
- Department of Organisms and Systems BiologyUniversity of OviedoOviedoSpain,Biodiversity Research Institute (IMIB)University of Oviedo‐Principality of Asturias‐CSICMieresSpain
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21
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Pottier P, Burke S, Zhang RY, Noble DWA, Schwanz LE, Drobniak SM, Nakagawa S. Developmental plasticity in thermal tolerance: Ontogenetic variation, persistence, and future directions. Ecol Lett 2022; 25:2245-2268. [PMID: 36006770 DOI: 10.1111/ele.14083] [Citation(s) in RCA: 34] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Revised: 07/06/2022] [Accepted: 07/09/2022] [Indexed: 01/07/2023]
Abstract
Understanding the factors affecting thermal tolerance is crucial for predicting the impact climate change will have on ectotherms. However, the role developmental plasticity plays in allowing populations to cope with thermal extremes is poorly understood. Here, we meta-analyse how thermal tolerance is initially and persistently impacted by early (embryonic and juvenile) thermal environments by using data from 150 experimental studies on 138 ectothermic species. Thermal tolerance only increased by 0.13°C per 1°C change in developmental temperature and substantial variation in plasticity (~36%) was the result of shared evolutionary history and species ecology. Aquatic ectotherms were more than three times as plastic as terrestrial ectotherms. Notably, embryos expressed weaker but more heterogenous plasticity than older life stages, with numerous responses appearing as non-adaptive. While developmental temperatures did not have persistent effects on thermal tolerance overall, persistent effects were vastly under-studied, and their direction and magnitude varied with ontogeny. Embryonic stages may represent a critical window of vulnerability to changing environments and we urge researchers to consider early life stages when assessing the climate vulnerability of ectotherms. Overall, our synthesis suggests that developmental changes in thermal tolerance rarely reach levels of perfect compensation and may provide limited benefit in changing environments.
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Affiliation(s)
- Patrice Pottier
- Evolution & Ecology Research Centre, School of Biological, Earth and Environmental Sciences, The University of New South Wales, Sydney, New South Wales, Australia
| | - Samantha Burke
- Evolution & Ecology Research Centre, School of Biological, Earth and Environmental Sciences, The University of New South Wales, Sydney, New South Wales, Australia
| | - Rose Y Zhang
- Division of Ecology and Evolution, Research School of Biology, College of Science, The Australian National University, Canberra, Australian Capital Territory, Australia
| | - Daniel W A Noble
- Division of Ecology and Evolution, Research School of Biology, College of Science, The Australian National University, Canberra, Australian Capital Territory, Australia
| | - Lisa E Schwanz
- Evolution & Ecology Research Centre, School of Biological, Earth and Environmental Sciences, The University of New South Wales, Sydney, New South Wales, Australia
| | - Szymon M Drobniak
- Evolution & Ecology Research Centre, School of Biological, Earth and Environmental Sciences, The University of New South Wales, Sydney, New South Wales, Australia.,Institute of Environmental Sciences, Jagiellonian University, Kraków, Poland
| | - Shinichi Nakagawa
- Evolution & Ecology Research Centre, School of Biological, Earth and Environmental Sciences, The University of New South Wales, Sydney, New South Wales, Australia
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