1
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Brieske SD, Mullen SC, Rees BB. Method dependency of maximum oxygen uptake rate and its repeatability in the Gulf killifish, Fundulus grandis. JOURNAL OF FISH BIOLOGY 2024; 104:1537-1547. [PMID: 38403734 DOI: 10.1111/jfb.15692] [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: 06/19/2023] [Revised: 12/18/2023] [Accepted: 02/07/2024] [Indexed: 02/27/2024]
Abstract
The maximum rate at which fish can take up oxygen from their environment to fuel aerobic metabolism is an important feature of their physiology and ecology. Methods to quantify maximum oxygen uptake rate (ṀO2), therefore, should reliably and reproducibly estimate the highest possible ṀO2 by an individual or species under a given set of conditions (peak ṀO2). This study determined peak ṀO2 and its repeatability in Gulf killifish, Fundulus grandis, subjected to three methods to elevate metabolism: swimming at increasing water speeds, during recovery after an exhaustive chase, and after ingestion of a large meal. Estimates of peak ṀO2 during swimming and after an exhaustive chase were repeatable across two trials, whereas peak ṀO2 after feeding was not. Peak ṀO2 determined by the three methods was significantly different from one another, being highest during swimming, lowest after an exhaustive chase, and intermediate after feeding. In addition, peak ṀO2 during recovery from an exhaustive chase depended on the length of time of recovery: in nearly 60% of the trials, values within the first hour of the chase were lower than those measured later. A novel and important finding was that an individual's peak ṀO2 was not repeatable when compared across methods. Therefore, the peak ṀO2 estimated for a group of fish, as well as the ranking of individual ṀO2 within that group, depends on the method used to elevate aerobic metabolism.
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Affiliation(s)
- Samantha D Brieske
- Department of Biological Sciences, University of New Orleans, New Orleans, Louisiana, USA
| | - Sylvia C Mullen
- Department of Biological Sciences, University of New Orleans, New Orleans, Louisiana, USA
| | - Bernard B Rees
- Department of Biological Sciences, University of New Orleans, New Orleans, Louisiana, USA
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2
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Queiros Q, McKenzie DJ, Dutto G, Killen S, Saraux C, Schull Q. Fish shrinking, energy balance and climate change. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 906:167310. [PMID: 37742954 DOI: 10.1016/j.scitotenv.2023.167310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Revised: 09/01/2023] [Accepted: 09/21/2023] [Indexed: 09/26/2023]
Abstract
A decline in size is increasingly recognised as a major response by ectothermic species to global warming. Mechanisms underlying this phenomenon are poorly understood but could include changes in energy balance of consumers, driven by declines in prey size coupled with increased energy demands due to warming. The sardine Sardina pilchardus is a prime example of animal shrinking, European populations of this planktivorous fish are undergoing profound decreases in body condition and adult size. This is apparently a bottom-up effect coincident with a shift towards increased reliance on smaller planktonic prey. We investigated the hypothesis that foraging on smaller prey would lead to increased rates of energy expenditure by sardines, and that such expenditures would be exacerbated by warming temperature. Using group respirometry we measured rates of energy expenditure indirectly, as oxygen uptake, by captive adult sardines offered food of two different sizes (0.2 or 1.2 mm items) when acclimated to two temperatures (16 °C or 21 °C). Energy expenditure during feeding on small items was tripled at 16 °C and doubled at 21 °C compared to large items, linked to a change in foraging mode between filter feeding on small or direct capture of large. This caused daily energy expenditure to increase by ~10 % at 16 °C and ~40 % at 21 °C on small items, compared to large items at 16 °C. These results support that declines in prey size coupled with warming could influence energy allocation towards life-history traits in wild populations. This bottom-up effect could partially explain the shrinking and declining condition of many small pelagic fish populations and may be contributing to the shrinking of other fish species throughout the marine food web. Understanding how declines in prey size can couple with warming to affect consumers is a crucial element of projecting the consequences for marine fauna of ongoing anthropogenic global change.
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Affiliation(s)
- Quentin Queiros
- MARBEC, Univ Montpellier, IFREMER, CNRS, IRD, Montpellier, Sète, Palavas-les-Flots, France; DECOD (Ecosystem Dynamics and Sustainability), INRAE, Institut Agro, IFREMER, Rennes, France.
| | - David J McKenzie
- MARBEC, Univ Montpellier, IFREMER, CNRS, IRD, Montpellier, Sète, Palavas-les-Flots, France
| | - Gilbert Dutto
- MARBEC, Univ Montpellier, IFREMER, CNRS, IRD, Montpellier, Sète, Palavas-les-Flots, France
| | - Shaun Killen
- Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Graham Kerr Building, Glasgow G12 8QQ, UK
| | - Claire Saraux
- IPHC UMR 7178, Université de Strasbourg, CNRS, Strasbourg, France
| | - Quentin Schull
- MARBEC, Univ Montpellier, IFREMER, CNRS, IRD, Montpellier, Sète, Palavas-les-Flots, France
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3
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Moffett ER, Fryxell DC, Simon KS. Multigenerational exposure to increased temperature reduces metabolic rate but increases boldness in
Gambusia affinis. Ecol Evol 2022; 12:e8853. [PMID: 35462979 PMCID: PMC9019145 DOI: 10.1002/ece3.8853] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2021] [Revised: 03/31/2022] [Accepted: 04/05/2022] [Indexed: 11/08/2022] Open
Abstract
Acute exposure to warming temperatures increases minimum energetic requirements in ectotherms. However, over and within multiple generations, increased temperatures may cause plastic and evolved changes that modify the temperature sensitivity of energy demand and alter individual behaviors. Here, we aimed to test whether populations recently exposed to geothermally elevated temperatures express an altered temperature sensitivity of metabolism and behavior. We expected that long‐term exposure to warming would moderate metabolic rate, reducing the temperature sensitivity of metabolism, with concomitant reductions in boldness and activity. We compared the temperature sensitivity of metabolic rate (acclimation at 20 vs. 30°C) and allometric slopes of routine, standard, and maximum metabolic rates, in addition to boldness and activity behaviors, across eight recently divergent populations of a widespread fish species (Gambusia affinis). Our data reveal that warm‐source populations express a reduced temperature sensitivity of metabolism, with relatively high metabolic rates at cool acclimation temperatures and relatively low metabolic rates at warm acclimation temperatures compared to ambient‐source populations. Allometric scaling of metabolism did not differ with thermal history. Across individuals from all populations combined, higher metabolic rates were associated with higher activity rates at 20°C and bolder behavior at 30°C. However, warm‐source populations displayed relatively bolder behavior at both acclimation temperatures compared to ambient‐source populations, despite their relatively low metabolic rates at warm acclimation temperatures. Overall, our data suggest that in response to warming, multigenerational exposure (e.g., plasticity, adaptation) may not result in trait change directed along a simple “pace‐of‐life syndrome” axis, instead causing relative decreases in metabolism and increases in boldness. Ultimately, our data suggest that multigenerational warming may produce a novel combination of physiological and behavioral traits, with consequences for animal performance in a warming world.
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Affiliation(s)
- Emma R. Moffett
- School of Environment The University of Auckland Auckland New Zealand
| | - David C. Fryxell
- School of Environment The University of Auckland Auckland New Zealand
| | - Kevin S. Simon
- School of Environment The University of Auckland Auckland New Zealand
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4
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Adams OA, Zhang Y, Gilbert MH, Lawrence CS, Snow M, Farrell AP. An unusually high upper thermal acclimation potential for rainbow trout. CONSERVATION PHYSIOLOGY 2022; 10:coab101. [PMID: 35492409 PMCID: PMC9040278 DOI: 10.1093/conphys/coab101] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 12/01/2021] [Accepted: 12/11/2021] [Indexed: 06/02/2023]
Abstract
Thermal acclimation, a compensatory physiological response, is central to species survival especially during the current era of global warming. By providing the most comprehensive assessment to date for the cardiorespiratory phenotype of rainbow trout (Oncorhynchus mykiss) at six acclimation temperatures from 15°C to 25°C, we tested the hypothesis that, compared with other strains of rainbow trout, an Australian H-strain of rainbow trout has been selectively inbred to have an unusually high and broad thermal acclimation potential. Using a field setting at the breeding hatchery in Western Australia, thermal performance curves were generated for a warm-adapted H-strain by measuring growth, feed conversion efficiency, specific dynamic action, whole-animal oxygen uptake (ṀO2) during normoxia and hypoxia, the critical maximum temperature and the electrocardiographic response to acute warming. Appreciable growth and aerobic capacity were possible up to 23°C. However, growth fell off drastically at 25°C in concert with increases in the time required to digest a meal, its total oxygen cost and its peak ṀO2. The upper thermal tipping points for appetite and food conversion efficiency corresponded with a decrease in the ability to increase heart rate during warming and an increase in the cost to digest a meal. Also, comparison of upper thermal tipping points provides compelling evidence that limitations to increasing heart rate during acute warming occurred well below the critical thermal maximum (CTmax) and that the faltering ability of the heart to deliver oxygen at different acclimation temperatures is not reliably predicted by CTmax for the H-strain of rainbow trout. We, therefore, reasoned the remarkably high thermal acclimation potential revealed here for the Australian H-strain of rainbow trout reflected the existing genetic variation within the founder Californian population, which was then subjected to selective inbreeding in association with severe heat challenges. This is an encouraging discovery for those with conservation concerns for rainbow trout and other fish species. Indeed, those trying to predict the impact of global warming should more fully consider the possibility that the standing intra-specific genetic variation within a fish species could provide a high thermal acclimation potential, similar to that shown here for rainbow trout.
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Affiliation(s)
- Olivia A Adams
- Department of Zoology, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Yangfan Zhang
- Corresponding author: Faculty of Land and Food Systems, The University of British Columbia, Vancouver, British Columbia, Canada and Museum of Comparative Zoology, Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts, United States
| | - Matthew H Gilbert
- Department of Zoology, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Craig S Lawrence
- Faculty of Science, School of Agriculture and Environment, The University of Western Australia, Perth, Western Australia, Australia
| | - Michael Snow
- Aquatic Life Industries, Perth, Western Australia, Australia
| | - Anthony P Farrell
- Faculty of Land and Food Systems, The University of British Columbia, Vancouver, British Columbia, Canada
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5
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Lefevre S, Wang T, McKenzie DJ. The role of mechanistic physiology in investigating impacts of global warming on fishes. J Exp Biol 2021; 224:224/Suppl_1/jeb238840. [PMID: 33627469 DOI: 10.1242/jeb.238840] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Warming of aquatic environments as a result of climate change is already having measurable impacts on fishes, manifested as changes in phenology, range shifts and reductions in body size. Understanding the physiological mechanisms underlying these seemingly universal patterns is crucial if we are to reliably predict the fate of fish populations with future warming. This includes an understanding of mechanisms for acute thermal tolerance, as extreme heatwaves may be a major driver of observed effects. The hypothesis of gill oxygen limitation (GOL) is claimed to explain asymptotic fish growth, and why some fish species are decreasing in size with warming; but its underlying assumptions conflict with established knowledge and direct mechanistic evidence is lacking. The hypothesis of oxygen- and capacity-limited thermal tolerance (OCLTT) has stimulated a wave of research into the role of oxygen supply capacity and thermal performance curves for aerobic scope, but results vary greatly between species, indicating that it is unlikely to be a universal mechanism. As thermal performance curves remain important for incorporating physiological tolerance into models, we discuss potentially fruitful alternatives to aerobic scope, notably specific dynamic action and growth rate. We consider the limitations of estimating acute thermal tolerance by a single rapid measure whose mechanism of action is not known. We emphasise the continued importance of experimental physiology, particularly in advancing our understanding of underlying mechanisms, but also the challenge of making this knowledge relevant to the more complex reality.
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Affiliation(s)
- Sjannie Lefevre
- Section for Physiology and Cell Biology, Department of Biosciences, University of Oslo, 0316 Oslo, Norway
| | - Tobias Wang
- Department of Biology - Zoophysiology, Aarhus University, 8000 Aarhus C, Denmark
| | - David J McKenzie
- Marine Biodiversity, Exploitation and Conservation (MARBEC), Université de Montpellier, CNRS, Ifremer, IRD, 34000 Montpellier, France
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6
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Pimsler ML, Oyen KJ, Herndon JD, Jackson JM, Strange JP, Dillon ME, Lozier JD. Biogeographic parallels in thermal tolerance and gene expression variation under temperature stress in a widespread bumble bee. Sci Rep 2020; 10:17063. [PMID: 33051510 PMCID: PMC7553916 DOI: 10.1038/s41598-020-73391-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Accepted: 09/17/2020] [Indexed: 12/19/2022] Open
Abstract
Global temperature changes have emphasized the need to understand how species adapt to thermal stress across their ranges. Genetic mechanisms may contribute to variation in thermal tolerance, providing evidence for how organisms adapt to local environments. We determine physiological thermal limits and characterize genome-wide transcriptional changes at these limits in bumble bees using laboratory-reared Bombus vosnesenskii workers. We analyze bees reared from latitudinal (35.7-45.7°N) and altitudinal (7-2154 m) extremes of the species' range to correlate thermal tolerance and gene expression among populations from different climates. We find that critical thermal minima (CTMIN) exhibit strong associations with local minimums at the location of queen origin, while critical thermal maximum (CTMAX) was invariant among populations. Concordant patterns are apparent in gene expression data, with regional differentiation following cold exposure, and expression shifts invariant among populations under high temperatures. Furthermore, we identify several modules of co-expressed genes that tightly correlate with critical thermal limits and temperature at the region of origin. Our results reveal that local adaptation in thermal limits and gene expression may facilitate cold tolerance across a species range, whereas high temperature responses are likely constrained, both of which may have implications for climate change responses of bumble bees.
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Affiliation(s)
- Meaghan L Pimsler
- Department of Biological Sciences, The University of Alabama, Tuscaloosa, AL, 35487, USA.
| | - Kennan J Oyen
- Department of Zoology and Physiology and Program in Ecology, University of Wyoming, Laramie, WY, 82071, USA
- Department of Biological Sciences, University of Cincinnati, Cincinnati, OH, 45221, USA
| | - James D Herndon
- USDA-ARS Pollinating Insects Research Unit, Utah State University, Logan, UT, 84322, USA
| | - Jason M Jackson
- Department of Biological Sciences, The University of Alabama, Tuscaloosa, AL, 35487, USA
| | - James P Strange
- USDA-ARS Pollinating Insects Research Unit, Utah State University, Logan, UT, 84322, USA
- Department of Entomology, The Ohio State University, Columbus, OH, 44691, USA
| | - Michael E Dillon
- Department of Zoology and Physiology and Program in Ecology, University of Wyoming, Laramie, WY, 82071, USA
| | - Jeffrey D Lozier
- Department of Biological Sciences, The University of Alabama, Tuscaloosa, AL, 35487, USA.
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7
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Nyboer EA, Chrétien E, Chapman LJ. Divergence in aerobic scope and thermal tolerance is related to local thermal regime in two populations of introduced Nile perch (Lates niloticus). JOURNAL OF FISH BIOLOGY 2020; 97:231-245. [PMID: 32333608 DOI: 10.1111/jfb.14355] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Accepted: 04/22/2020] [Indexed: 05/21/2023]
Abstract
We tested whether thermal tolerance and aerobic performance differed between two populations of Nile perch (Lates niloticus) originating from the same source population six decades after their introduction into two lakes in the Lake Victoria basin in East Africa. We used short-term acclimation of juvenile fish to a range of temperatures from ambient to +6°C, and performed critical thermal maximum (CTmax ) and respirometry tests to measure upper thermal tolerance, resting and maximum metabolic rates, and aerobic scope (AS). Across acclimation temperatures, Nile perch from the cooler lake (Lake Nabugabo, Uganda) tended to have lower thermal tolerance (i.e., CTmax ) and lower aerobic performance (i.e., AS) than Nile perch from the warmer waters of Lake Victoria (Bugonga region, Uganda). Effects of temperature acclimation were more pronounced in the Lake Victoria population, with the Lake Nabugabo fish showing less thermal plasticity in most metabolic traits. Our results suggest phenotypic divergence in thermal tolerance between these two introduced populations in a direction consistent with an adaptive response to local thermal regimes.
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Affiliation(s)
- Elizabeth A Nyboer
- Department of Biology, McGill University, Montreal, Canada
- Department of Biology, Carleton Univeristy, Ottawa, Canada
| | - Emmanuelle Chrétien
- Département de sciences biologiques, Université de Montréal, Montreal, Canada
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8
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Livingston MD, Bhargav VV, Turko AJ, Wilson JM, Wright PA. Widespread use of emersion and cutaneous ammonia excretion in Aplocheiloid killifishes. Proc Biol Sci 2018; 285:rspb.2018.1496. [PMID: 30111602 DOI: 10.1098/rspb.2018.1496] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2018] [Accepted: 07/17/2018] [Indexed: 11/12/2022] Open
Abstract
The invasion of land required amphibious fishes to evolve new strategies to avoid toxic ammonia accumulation in the absence of water flow over the gills. We investigated amphibious behaviour and nitrogen excretion strategies in six phylogenetically diverse Aplocheiloid killifishes (Anablepsoides hartii, Cynodonichthys hildebrandi, Rivulus cylindraceus, Kryptolebias marmoratus, Fundulopanchax gardneri, and Aplocheilus lineatus) in order to determine if a common strategy evolved. All species voluntarily emersed (left water) over several days, and also in response to environmental stressors (low O2, high temperature). All species were ammoniotelic in water and released gaseous ammonia (NH3 volatilization) during air exposure as the primary route for nitrogen excretion. Metabolic depression, urea synthesis, and/or ammonia accumulation during air exposure were not common strategies used by these species. Immunostaining revealed the presence of ammonia-transporting Rhesus proteins (Rhcg1 and Rhcg2) in the skin of all six species, indicating a shared mechanism for ammonia volatilization. We also found Rhcg in the skin of several other fully aquatic fishes, implying that cutaneous ammonia excretion is not exclusive to amphibious fishes. Overall, our results demonstrate that similar nitrogen excretion strategies while out of water were used by all killifish species tested; possibly the result of shared ancestral amphibious traits, phenotypic convergence, or a combination of both.
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Affiliation(s)
- Michael D Livingston
- Department of Integrative Biology, University of Guelph, Guelph, ON, Canada N1G 2W1
| | - Vikram V Bhargav
- Department of Integrative Biology, University of Guelph, Guelph, ON, Canada N1G 2W1
| | - Andy J Turko
- Department of Integrative Biology, University of Guelph, Guelph, ON, Canada N1G 2W1
| | - Jonathan M Wilson
- Department of Biology, Wilfrid Laurier University, ON, Canada N2 L 3C5
| | - Patricia A Wright
- Department of Integrative Biology, University of Guelph, Guelph, ON, Canada N1G 2W1
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9
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Clown knifefish ( Chitala ornata ) oxygen uptake and its partitioning in present and future temperature environments. Comp Biochem Physiol A Mol Integr Physiol 2018; 216:52-59. [DOI: 10.1016/j.cbpa.2017.11.018] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2017] [Revised: 11/24/2017] [Accepted: 11/28/2017] [Indexed: 11/21/2022]
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10
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Rooke AC, Burness G, Fox MG. Thermal physiology of native cool-climate, and non-native warm-climate Pumpkinseed sunfish raised in a common environment. J Therm Biol 2017; 64:48-57. [DOI: 10.1016/j.jtherbio.2016.12.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2016] [Revised: 10/26/2016] [Accepted: 12/21/2016] [Indexed: 11/25/2022]
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11
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Verhille CE, English KK, Cocherell DE, Farrell AP, Fangue NA. High thermal tolerance of a rainbow trout population near its southern range limit suggests local thermal adjustment. CONSERVATION PHYSIOLOGY 2016; 4:cow057. [PMID: 27957333 PMCID: PMC5146681 DOI: 10.1093/conphys/cow057] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Revised: 10/24/2016] [Accepted: 11/01/2016] [Indexed: 05/24/2023]
Abstract
Transformation of earth's ecosystems by anthropogenic climate change is predicted for the 21st century. In many regions, the associated increase in environmental temperatures and reduced precipitation will have direct effects on the physiological performance of terrestrial and aquatic ectotherms and have already threatened fish biodiversity and important fisheries. The threat of elevated environmental temperatures is particularly salient for members of the Oncorhynchus genus living in California, which is the southern limit of their range. Here, we report the first assessments of the aerobic capacity of a Californian population of wild Oncorhynchus mykiss Walbaum in relationship to water temperature. Our field measurements revealed that wild O. mykiss from the lower Tuolumne River, California maintained 95% of their peak aerobic scope across an impressive temperature range (17.8-24.6°C). The thermal range for peak performance corresponds to local high river temperatures, but represents an unusually high temperature tolerance compared with conspecifics and congeneric species from northern latitudes. This high thermal tolerance suggests that O. mykiss at the southern limit of their indigenous distribution may be locally adjusted relative to more northern populations. From fisheries management and conservation perspectives, these findings challenge the use of a single thermal criterion to regulate the habitat of the O. mykiss species along the entirety of its distribution range.
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Affiliation(s)
- Christine E. Verhille
- Department of Wildlife, Fish and Conservation Biology, University of California Davis, Davis, CA 95616, USA
| | | | - Dennis E. Cocherell
- Department of Wildlife, Fish and Conservation Biology, University of California Davis, Davis, CA 95616, USA
| | - Anthony P. Farrell
- Department of Zoology and Faculty of Land and Food Systems, University of British Columbia, Vancouver, British Columbia, CanadaV6T 1Z4
| | - Nann A. Fangue
- Department of Wildlife, Fish and Conservation Biology, University of California Davis, Davis, CA 95616, USA
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12
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Relationship between cardiac performance and environment across populations of Atlantic salmon (Salmo salar): a common garden experiment implicates local adaptation. Evol Ecol 2016. [DOI: 10.1007/s10682-016-9847-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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13
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Farrell AP. Pragmatic perspective on aerobic scope: peaking, plummeting, pejus and apportioning. JOURNAL OF FISH BIOLOGY 2016; 88:322-343. [PMID: 26592201 DOI: 10.1111/jfb.12789] [Citation(s) in RCA: 108] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2014] [Accepted: 08/05/2015] [Indexed: 06/05/2023]
Abstract
A major challenge for fish biologists in the 21st century is to predict the biotic effects of global climate change. With marked changes in biogeographic distribution already in evidence for a variety of aquatic animals, mechanistic explanations for these shifts are being sought, ones that then can be used as a foundation for predictive models of future climatic scenarios. One mechanistic explanation for the thermal performance of fishes that has gained some traction is the oxygen and capacity-limited thermal tolerance (OCLTT) hypothesis, which suggests that an aquatic organism's capacity to supply oxygen to tissues becomes limited when body temperature reaches extremes. Central to this hypothesis is an optimum temperature for absolute aerobic scope (AAS, loosely defined as the capacity to deliver oxygen to tissues beyond a basic need). On either side of this peak for AAS are pejus temperatures that define when AAS falls off and thereby reduces an animal's absolute capacity for activity. This article provides a brief perspective on the potential uses and limitations of some of the key physiological indicators related to aerobic scope in fishes. The intent is that practitioners who attempt predictive ecological applications can better recognize limitations and make better use of the OCLTT hypothesis and its underlying physiology.
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Affiliation(s)
- A P Farrell
- Department of Zoology and The Faculty of Land and Food Systems, University of British Columbia, 6270 University Blvd., Vancouver, BC, V6T 1Z4, Canada
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14
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Chabot D, Koenker R, Farrell AP. The measurement of specific dynamic action in fishes. JOURNAL OF FISH BIOLOGY 2016; 88:152-172. [PMID: 26768974 DOI: 10.1111/jfb.12836] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2015] [Accepted: 09/30/2015] [Indexed: 06/05/2023]
Abstract
Specific dynamic action (SDA) is the postprandial increase in oxygen uptake. Whereas it is easy to measure in fishes that remain calm and motionless during the entire digestion period, spontaneous locomotor activity is a frequent problem that leads to overestimation of SDA amplitude and magnitude (area under the curve, bound by the standard metabolic rate, SMR). Few studies have attempted to remove the effect of fish activity on SDA. A new method, non-parametric quantile regression, is described to estimate SDA even when pronounced circadian activity cycles are present. Data from juvenile Atlantic cod Gadus morhua are used to demonstrate its use and advantages compared with traditional techniques. Software (scripts in the R language) is provided to facilitate its use.
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Affiliation(s)
- D Chabot
- Maurice Lamontagne Institute, Fisheries & Oceans Canada, Mont-Joli, QC, G5H 3Z4, Canada
| | - R Koenker
- Department of Economics, University of Illinois, Champaign, IL 61820, U.S.A
| | - A P Farrell
- Faculty of Land and Food Systems, Department of Zoology, 2357 Main Mall, Vancouver, BC V6T 1Z4, Canada
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15
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Oomen RA, Hutchings JA. Variation in spawning time promotes genetic variability in population responses to environmental change in a marine fish. CONSERVATION PHYSIOLOGY 2015; 3:cov027. [PMID: 27293712 PMCID: PMC4778481 DOI: 10.1093/conphys/cov027] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2015] [Revised: 05/03/2015] [Accepted: 05/09/2015] [Indexed: 05/29/2023]
Abstract
The level of phenotypic plasticity displayed within a population (i.e. the slope of the reaction norm) reflects the short-term response of a population to environmental change, while variation in reaction norm slopes among populations reflects spatial variation in these responses. Thus far, studies of thermal reaction norm variation have focused on geographically driven adaptation among different latitudes, altitudes or habitats. Yet, thermal variability is a function of both space and time. For organisms that reproduce at different times of year, such variation has the potential to promote adaptive variability in thermal responses for critical early life stages. Using common-garden experiments, we examined the spatial scale of genetic variation in thermal plasticity for early life-history traits among five populations of endangered Atlantic cod (Gadus morhua) that spawn at different times of year. Patterns of plasticity for larval growth and survival suggest that population responses to climate change will differ substantially, with increasing water temperatures posing a considerably greater threat to autumn-spawning cod than to those that spawn in winter or spring. Adaptation to seasonal cooling or warming experienced during the larval stage is suggested as a possible cause. Furthermore, populations that experience relatively cold temperatures during early life might be more sensitive to changes in temperature. Substantial divergence in adaptive traits was evident at a smaller spatial scale than has previously been shown for a marine fish with no apparent physical barriers to gene flow (∼200 km). Our findings highlight the need to consider the impact of intraspecific variation in reproductive timing on thermal adaptation when forecasting the effects of climate change on animal populations.
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Affiliation(s)
- Rebekah A Oomen
- Department of Biology, Dalhousie University, Halifax, Nova Scotia, Canada B3H 4R2
- Centre for Ecological and Evolutionary Synthesis (CEES), Department of Biosciences, University of Oslo, Oslo 0371, Norway
| | - Jeffrey A Hutchings
- Department of Biology, Dalhousie University, Halifax, Nova Scotia, Canada B3H 4R2
- Centre for Ecological and Evolutionary Synthesis (CEES), Department of Biosciences, University of Oslo, Oslo 0371, Norway
- Department of Natural Sciences, University of Agder, Kristiansand 4630, Norway
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16
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McKenzie DJ, Vergnet A, Chatain B, Vandeputte M, Desmarais E, Steffensen JF, Guinand B. Physiological mechanisms underlying individual variation in tolerance of food deprivation in juvenile European sea bass, Dicentrarchus labrax. ACTA ACUST UNITED AC 2015; 217:3283-92. [PMID: 25232198 DOI: 10.1242/jeb.101857] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Although food deprivation is a major ecological pressure in fishes, there is wide individual variation in tolerance of fasting, whose mechanistic bases are poorly understood. Two thousand individually tagged juvenile European sea bass were submitted to two 'fasting/feeding' cycles each comprising 3 weeks of food deprivation followed by 3 weeks of ad libitum feeding at 25°C. Rates of mass loss during the two fasting periods were averaged for each individual to calculate a population mean. Extreme fasting tolerant (FT) and sensitive (FS) phenotypes were identified that were at least one and a half standard deviations, on opposing sides, from this mean. Respirometry was used to investigate two main hypotheses: (1) tolerance of food deprivation reflects lower mass-corrected routine metabolic rate (RMR) in FT phenotypes when fasting, and (2) tolerance reflects differences in substrate utilisation; FT phenotypes use relatively less proteins as metabolic fuels during fasting, measured as their ammonia quotient (AQ), the simultaneous ratio of ammonia excretion to RMR. There was no difference in mean RMR between FT and FS over 7 days fasting, being 6.70±0.24 mmol h(-1) fish(-1) (mean ± s.e.m., N=18) versus 6.76±0.22 mmol h(-1) fish(-1) (N=17), respectively, when corrected to a body mass of 130 g. For any given RMR, however, the FT lost mass at a significantly lower rate than FS, overall 7-day average being 0.72±0.05 versus 0.90±0.05 g day(-1) fish(-1), respectively (P<0.01, t-test). At 20 h after receiving a ration equivalent to 2% body mass as food pellets, ammonia excretion and simultaneous RMR were elevated and similar in FT and FS, with AQs of 0.105±0.009 and 0.089±0.007, respectively. At the end of the period of fasting, ammonia excretion and RMR had fallen in both phenotypes, but AQ was significantly lower in FT than FS, being 0.038±0.004 versus 0.061±0.005, respectively (P<0.001, t-test). There was a direct linear relationship between individual fasted AQ and rate of mass loss, with FT and FS individuals distributed at opposing lower and upper extremities, respectively. Thus the difference between the phenotypes in their tolerance of food deprivation did not depend upon their routine energy use when fasting. Rather, it depended upon their relative use of tissue proteins as metabolic fuels when fasting, which was significantly lower in FT phenotypes.
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Affiliation(s)
- David J McKenzie
- UMR5119, Ecologie des systèmes marins côtiers (ECOSYM), Place Eugène Bataillon, Université Montpellier 2, 34095 Montpellier Cedex 5, France
| | - Alain Vergnet
- Ifremer, Station expérimentale d'aquaculture, chemin de Maguelone, 34250 Palavas-les-Flots, France
| | - Béatrice Chatain
- Ifremer, Station expérimentale d'aquaculture, chemin de Maguelone, 34250 Palavas-les-Flots, France
| | - Marc Vandeputte
- Ifremer, Station expérimentale d'aquaculture, chemin de Maguelone, 34250 Palavas-les-Flots, France INRA UMR1313, Génétique Animale et Biologie Intégrative, Domaine de Vilvert, 78350 Jouy-en-Josas, France
| | - Erick Desmarais
- UMR5554, Institut des Sciences de l'Evolution de Montpellier (ISE-M), Place Eugène Bataillon, Université Montpellier 2, 34095 Montpellier Cedex 5, France
| | - John F Steffensen
- Marine Biological Section, University of Copenhagen, Strandpromenaden 5, DK-3000 Helsingør, Denmark
| | - Bruno Guinand
- UMR5554, Institut des Sciences de l'Evolution de Montpellier (ISE-M), Place Eugène Bataillon, Université Montpellier 2, 34095 Montpellier Cedex 5, France
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17
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Svendsen JC, Tirsgaard B, Cordero GA, Steffensen JF. Intraspecific variation in aerobic and anaerobic locomotion: gilthead sea bream (Sparus aurata) and Trinidadian guppy (Poecilia reticulata) do not exhibit a trade-off between maximum sustained swimming speed and minimum cost of transport. Front Physiol 2015; 6:43. [PMID: 25741285 PMCID: PMC4330683 DOI: 10.3389/fphys.2015.00043] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2014] [Accepted: 01/29/2015] [Indexed: 11/17/2022] Open
Abstract
Intraspecific variation and trade-off in aerobic and anaerobic traits remain poorly understood in aquatic locomotion. Using gilthead sea bream (Sparus aurata) and Trinidadian guppy (Poecilia reticulata), both axial swimmers, this study tested four hypotheses: (1) gait transition from steady to unsteady (i.e., burst-assisted) swimming is associated with anaerobic metabolism evidenced as excess post exercise oxygen consumption (EPOC); (2) variation in swimming performance (critical swimming speed; Ucrit) correlates with metabolic scope (MS) or anaerobic capacity (i.e., maximum EPOC); (3) there is a trade-off between maximum sustained swimming speed (Usus) and minimum cost of transport (COTmin); and (4) variation in Usus correlates positively with optimum swimming speed (Uopt; i.e., the speed that minimizes energy expenditure per unit of distance traveled). Data collection involved swimming respirometry and video analysis. Results showed that anaerobic swimming costs (i.e., EPOC) increase linearly with the number of bursts in S. aurata, with each burst corresponding to 0.53 mg O2 kg−1. Data are consistent with a previous study on striped surfperch (Embiotoca lateralis), a labriform swimmer, suggesting that the metabolic cost of burst swimming is similar across various types of locomotion. There was no correlation between Ucrit and MS or anaerobic capacity in S. aurata indicating that other factors, including morphological or biomechanical traits, influenced Ucrit. We found no evidence of a trade-off between Usus and COTmin. In fact, data revealed significant negative correlations between Usus and COTmin, suggesting that individuals with high Usus also exhibit low COTmin. Finally, there were positive correlations between Usus and Uopt. Our study demonstrates the energetic importance of anaerobic metabolism during unsteady swimming, and provides intraspecific evidence that superior maximum sustained swimming speed is associated with superior swimming economy and optimum speed.
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Affiliation(s)
- Jon C Svendsen
- Molecular Eco-physiology, Interdisciplinary Center of Marine and Environmental Research, University of Porto Porto, Portugal ; Fisheries and Maritime Museum Esbjerg, Denmark
| | - Bjørn Tirsgaard
- Marine Biological Section, Biological Institute, University of Copenhagen Helsingør, Denmark
| | - Gerardo A Cordero
- Ecology, Evolution, and Organismal Biology, Iowa State University Ames, IA, USA
| | - John F Steffensen
- Marine Biological Section, Biological Institute, University of Copenhagen Helsingør, Denmark
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18
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Tirsgaard B, Svendsen JC, Steffensen JF. Effects of temperature on specific dynamic action in Atlantic cod Gadus morhua. FISH PHYSIOLOGY AND BIOCHEMISTRY 2015; 41:41-50. [PMID: 25343877 DOI: 10.1007/s10695-014-0004-y] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2014] [Accepted: 10/18/2014] [Indexed: 06/04/2023]
Abstract
Growth requires that energy is directed towards ingestion, digestion, absorption and assimilation of a meal; energy expenditures are often expressed as the specific dynamic action (SDA). While SDA is an important part of fish energy budgets and strongly affected by water temperature, temperature effects are not known across a wide temperature range in Atlantic cod Gadus morhua. The objective of this study was to examine effects of temperature (2, 5, 10, 15 or 20 °C) on the energetic cost and time used for SDA in juvenile G. morhua by intermittent flow respirometry. At each temperature, G. morhua were fed a meal of herring (Clupea harengus) corresponding to 5 % of the body mass. Standard metabolic rates measured pre-feeding and post-feeding metabolic rates were measured to determine SDA. The study showed that SDA coefficients (%, SDA energy divided by meal energy) were significantly lower at 2 and 10 °C (5.4-6.3 %) compared to 5, 15 and 20 °C (10.4-12.4 %), while SDA duration increased significantly from 80 h at 10 °C to 130-160 h at 2, 15 and 20 °C and reached a maximum of 250 h at 5 °C. The significant decrease in SDA duration at 10 °C combined with a low SDA coefficient suggests that water temperatures close to 10 °C may represent the optimum temperatures for SDA in this population of G. morhua. Our results suggest that SDA is not a simple function of temperature, but may vary with temperature in a more complex fashion.
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Affiliation(s)
- Bjørn Tirsgaard
- Marine Biological Section, Biological Institute, University of Copenhagen, Strandpromenaden 5, 3000, Helsingør, Denmark,
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19
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Lee-Yaw JA, Jacobs CGC, Irwin DE. Individual performance in relation to cytonuclear discordance in a northern contact zone between long-toed salamander (Ambystoma macrodactylum) lineages. Mol Ecol 2014; 23:4590-602. [DOI: 10.1111/mec.12878] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2014] [Revised: 07/01/2014] [Accepted: 07/10/2014] [Indexed: 01/29/2023]
Affiliation(s)
- Julie A. Lee-Yaw
- Department of Zoology; University of British Columbia; 6270 University Blvd. Vancouver British Columbia Canada V6T 1Z4
| | - Chris G. C. Jacobs
- Institute of Biology Leiden; Leiden University; Sylviusweg 72 2333 BE Leiden The Netherlands
| | - Darren E. Irwin
- Department of Zoology; University of British Columbia; 6270 University Blvd. Vancouver British Columbia Canada V6T 1Z4
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20
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Atlantic salmon show capability for cardiac acclimation to warm temperatures. Nat Commun 2014; 5:4252. [PMID: 24957572 DOI: 10.1038/ncomms5252] [Citation(s) in RCA: 81] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2014] [Accepted: 05/28/2014] [Indexed: 11/09/2022] Open
Abstract
Increases in environmental temperature predicted to result from global warming have direct effects on performance of ectotherms. Moreover, cardiac function has been observed to limit the tolerance to high temperatures. Here we show that two wild populations of Atlantic salmon originating from northern and southern extremes of its European distribution have strikingly similar cardiac responses to acute warming when acclimated to common temperatures, despite different local environments. Although cardiac collapse starts at 21-23 °C with a maximum heart rate of ~150 beats per min (bpm) for 12 °C-acclimated fish, acclimation to 20 °C considerably raises this temperature (27.5 °C) and maximum heart rate (~200 bpm). Only minor population differences exist and these are consistent with the warmer habitat of the southern population. We demonstrate that the considerable cardiac plasticity discovered for Atlantic salmon is largely independent of natural habitat, and we propose that observed cardiac plasticity may aid salmon to cope with global warming.
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21
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Sidhu R, Anttila K, Farrell AP. Upper thermal tolerance of closely related Danio species. JOURNAL OF FISH BIOLOGY 2014; 84:982-995. [PMID: 24689673 DOI: 10.1111/jfb.12339] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2013] [Accepted: 01/09/2014] [Indexed: 06/03/2023]
Abstract
The main finding of this study was that measuring maximum heart rate during incremental warming was an effective tool to estimate upper thermal limits in three small cyprinid Danio species, which differed significantly. Arrhenius breakpoint temperature for maximum heart rate, purportedly an index of optimum temperature, was 21·2 ± 0·4, 20·1 ± 0·4 and 18·9 ± 0·8° C (mean ± s.e.) for zebrafish Danio rerio, pearl danio Danio albolineatus and glowlight danio Danio choprae, respectively. The temperature where cardiac arrhythmias were first induced during warming (T(arr)) was 36·6 ± 0·7, 36·9 ± 0·8 and 33·2 ± 0·8° C (mean ± s.e.) and critical thermal maximum (T(Cm)) was 39·9 ± 0·1, 38·9 ± 0·1 and 37·2 ± 0·1° C (mean ± s.e.) for D. rerio, D. albolineatus and D. choprae, respectively. The finding that T(arr) was consistently 3-4° C lower than T(Cm) suggests that collapse of the cardiac life support system may be a critical trigger for upper temperature tolerance. The upper thermal limits established here, which correlate well with a broad natural environmental temperature range for D. rerio and a narrow one for D. choprae, suggest that upper thermal tolerance may be a genetic trait even among closely related species acclimated to common temperatures.
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Affiliation(s)
- R Sidhu
- Department of Zoology, University of British Columbia, 6270 University Blvd., Vancouver, BC, V6T 1Z4 Canada
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22
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McCann S, Greenlees MJ, Newell D, Shine R. Rapid acclimation to cold allows the cane toad to invade montane areas within its Australian range. Funct Ecol 2014. [DOI: 10.1111/1365-2435.12255] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Samantha McCann
- School of Biological Sciences; University of Sydney; Sydney New South Wales 2006 Australia
| | - Matthew J. Greenlees
- School of Biological Sciences; University of Sydney; Sydney New South Wales 2006 Australia
| | - David Newell
- School of Environment, Science and Engineering; Southern Cross University; Lismore New South Wales 2480 Australia
| | - Richard Shine
- School of Biological Sciences; University of Sydney; Sydney New South Wales 2006 Australia
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