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Noiret A, Karanewsky C, Aujard F, Terrien J. Sex-specific heterothermy patterns in wintering captive Microcebus murinus do not translate into differences in energy balance. J Therm Biol 2024; 121:103829. [PMID: 38569326 DOI: 10.1016/j.jtherbio.2024.103829] [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: 08/09/2023] [Revised: 02/28/2024] [Accepted: 02/28/2024] [Indexed: 04/05/2024]
Abstract
The physiological mechanisms of responses to stressors are at the core of ecophysiological studies that examine the limits of an organism's flexibility. Interindividual variability in these physiological responses can be particularly important and lead to differences in the stress response among population groups, which can affect population dynamics. Some observations of intersexual differences in heterothermy raise the question of whether there is a difference in energy management between the sexes. In this study, we assessed male and female differences in mouse lemurs (Microcebus murinus), a highly seasonal malagasy primate, by measuring their physiological flexibility in response to caloric restriction and examining the subsequent impact on reproductive success. Using complementary methods aiming to describe large-scale and daily variations in body temperature throughout a 6-month winter-like short-day (SD) period, we monitored 12 males and 12 females, applying chronic 40% caloric restriction (CR) to 6 individuals in each group. We found variations in Tb modulation throughout the SD period and in response to caloric treatment that depended on sex, as females, regardless of food restriction, and CR males, only, entered deep torpor. The use of deeper torpor, however, did not translate into a lower loss of body mass in females and did not affect reproductive success. Captive conditions may have buffered the depth of torpor and minimised the positive effects of torpor on energy savings. However, the significant sex differences in heterothermy we observed may point to physiological benefits other than preservation of energy reserves.
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Affiliation(s)
- Aude Noiret
- Unité Mécanismes Adaptatifs et Evolution (MECADEV), Muséum National D'Histoire Naturelle, CNRS UMR 7179, Brunoy, France.
| | - Caitlin Karanewsky
- Department of Biochemistry, Stanford University School of Medicine, California, 94305, USA
| | - Fabienne Aujard
- Unité Mécanismes Adaptatifs et Evolution (MECADEV), Muséum National D'Histoire Naturelle, CNRS UMR 7179, Brunoy, France
| | - Jérémy Terrien
- Unité Mécanismes Adaptatifs et Evolution (MECADEV), Muséum National D'Histoire Naturelle, CNRS UMR 7179, Brunoy, France.
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2
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Trondrud LM, Pigeon G, Albon S, Arnold W, Evans AL, Irvine RJ, Król E, Ropstad E, Stien A, Veiberg V, Speakman JR, Loe LE. Determinants of heart rate in Svalbard reindeer reveal mechanisms of seasonal energy management. Philos Trans R Soc Lond B Biol Sci 2021; 376:20200215. [PMID: 34176322 PMCID: PMC8237166 DOI: 10.1098/rstb.2020.0215] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/03/2021] [Indexed: 02/02/2023] Open
Abstract
Seasonal energetic challenges may constrain an animal's ability to respond to changing individual and environmental conditions. Here, we investigated variation in heart rate, a well-established proxy for metabolic rate, in Svalbard reindeer (Rangifer tarandus platyrhynchus), a species with strong seasonal changes in foraging and metabolic activity. In 19 adult females, we recorded heart rate, subcutaneous temperature and activity using biologgers. Mean heart rate more than doubled from winter to summer. Typical drivers of energy expenditure, such as reproduction and activity, explained a relatively limited amount of variation (2-6% in winter and 16-24% in summer) compared to seasonality, which explained 75% of annual variation in heart rate. The relationship between heart rate and subcutaneous temperature depended on individual state via body mass, age and reproductive status, and the results suggested that peripheral heterothermy is an important pathway of energy management in both winter and summer. While the seasonal plasticity in energetics makes Svalbard reindeer well-adapted to their highly seasonal environment, intraseasonal constraints on modulation of their heart rate may limit their ability to respond to severe environmental change. This study emphasizes the importance of encompassing individual state and seasonal context when studying energetics in free-living animals. This article is part of the theme issue 'Measuring physiology in free-living animals (Part II)'.
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Affiliation(s)
- L. Monica Trondrud
- Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, NO-1432 Ås, Norway
| | - Gabriel Pigeon
- Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, NO-1432 Ås, Norway
- Département de Biologie, Faculté des Sciences, Université de Sherbrooke, 2500 boul. de l'Université, Sherbrooke, Québec, Canada, J1 K 2R1
| | - Steve Albon
- The James Hutton Institute, Craigiebuckler, Aberdeen AB15 8QH, UK
| | - Walter Arnold
- Department of Interdisciplinary Life Sciences, Research Institute of Wildlife Ecology, University of Veterinary Medicine, Savoyenstr. 1, 1160 Vienna, Austria
| | - Alina L. Evans
- Department of Forestry and Wildlife Management, Inland Norway University of Applied Sciences, Campus Evenstad, 2418 Elverum, Norway
| | - R. Justin Irvine
- The James Hutton Institute, Craigiebuckler, Aberdeen AB15 8QH, UK
- Frankfurt Zoological Society, PO Box 100003, South Africa Street, Addis Ababa, Ethiopia
| | - Elżbieta Król
- School of Biological Sciences, Institute of Biological and Environmental Sciences, University of Aberdeen, Aberdeen AB24 2TZ, UK
| | - Erik Ropstad
- Faculty of Veterinary Science, Norwegian University of Life Sciences, PO Box 8146, NO-0033 Oslo, Norway
| | - Audun Stien
- Department of Arctic and Marine Biology, The Arctic University of Norway, PO Box 6050 Langnes, NO-9037 Tromsø, Norway
| | - Vebjørn Veiberg
- Norwegian Institute for Nature Research, PO Box 5685 Torgarden, NO-7485 Trondheim, Norway
| | - John R. Speakman
- School of Biological Sciences, Institute of Biological and Environmental Sciences, University of Aberdeen, Aberdeen AB24 2TZ, UK
- Center for Energy Metabolism and Reproduction, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, People's Republic of China
- CAS Center of Excellence in Animal Evolution and Genetics, Kunming 650223, People's Republic of China
- State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, People's Republic of China
| | - Leif Egil Loe
- Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, NO-1432 Ås, Norway
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Ungerfeld R, Villagrán M, Gil-Laureiro J, Sestelo A, Beracochea F, Fumagalli F, Bielli A. Adult and yearling pampas deer stags ( Ozotoceros bezoarticus) display mild reproductive seasonal patterns with maximum values in autumn. Anim Reprod 2020; 17:e20200021. [PMID: 32714462 PMCID: PMC7375868 DOI: 10.1590/1984-3143-ar2020-0021] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Abstract
The pampas deer is an endangered species, from which reproductive biology little is known. We aimed to describe and compare the reproductive seasonal patterns of adult and yearling pampas deer stags throughout the year, including morphological traits, testosterone concentration, sperm morphology and cryoresistance pattern changes. Six adult (AS) and five yearling (YS) stags were captured with anesthetic darts once in winter, spring, summer and autumn to study morphological variables, serum testosterone and semen. Adult males were heavier, their neck girth tended to be greater and their testosterone concentration was higher than in YS. Animals were heavier in summer and autumn. Neck girth and testosterone concentration were greater in autumn. Scrotal circumference, testicular volume and gonado-somatic index varied with seasons, decreasing from winter to spring, increasing in summer and remaining in greater values in autumn. Sperm quality had maximum values from summer to winter. However, the cryoresistance ratio of motility score was greater in spring. In conclusion, in the captivity conditions, pampas deer stags seems to present a light seasonal reproductive pattern, with maximum testis size, testosterone secretion and fresh semen quality in autumn. Nevertheless, sperm cryoresistance ratio seemed to remain stable along the year. Although YS were still growing, they achieved similar semen quality than AS.
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Affiliation(s)
- Rodolfo Ungerfeld
- Departamento de Biociencias Veterinarias, Facultad de Veterinaria, Universidad de la República, Montevideo, Uruguay
| | - Matías Villagrán
- Departamento de Biociencias Veterinarias, Facultad de Veterinaria, Universidad de la República, Montevideo, Uruguay
| | - Jorge Gil-Laureiro
- Laboratorio de Reproducción Animal, Centro Universitario Regional Litoral Norte Salto, Universidad de la República, Paysandú, Uruguay
| | - Adrián Sestelo
- Laboratorio de Biotecnología Reproductiva, Ecoparque, Buenos Aires, Argentina
| | - Florencia Beracochea
- Departamento de Biociencias Veterinarias, Facultad de Veterinaria, Universidad de la República, Montevideo, Uruguay
| | - Fernando Fumagalli
- Área de Semiología, Facultad de Veterinaria, Universidad de la República, Montevideo, Uruguay
| | - Alejandro Bielli
- Departamento de Biociencias Veterinarias, Facultad de Veterinaria, Universidad de la República, Montevideo, Uruguay
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4
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Noiret A, Puch L, Riffaud C, Costantini D, Riou JF, Aujard F, Terrien J. Sex-Specific Response to Caloric Restriction After Reproductive Investment in Microcebus murinus: An Integrative Approach. Front Physiol 2020; 11:506. [PMID: 32612534 PMCID: PMC7308708 DOI: 10.3389/fphys.2020.00506] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Accepted: 04/24/2020] [Indexed: 12/22/2022] Open
Abstract
In seasonal environments, males and females usually maintain high metabolic activity during the whole summer season, exhausting their energy reserves. In the global warming context, unpredictability of food availability during summer could dramatically challenge the energy budget of individuals. Therefore, one can predict that resilience to environmental stress would be dramatically endangered during summer. Here, we hypothesized that females could have greater capacity to survive harsh conditions than males, considering the temporal shift in their respective reproductive energy investment, which can challenge them differently, as well as enhanced flexibility in females' physiological regulation. We tackled this question on the gray mouse lemur (Microcebus murinus), focusing on the late summer period, after the reproductive effort. We monitored six males and six females before and after a 2-weeks 60% caloric restriction (CR), measuring different physiological and cellular parameters in an integrative and comparative multiscale approach. Before CR, females were heavier than males and mostly characterized by high levels of energy expenditure, a more energetic mitochondrial profile and a downregulation of blood antioxidants. We observed a similar energy balance between sexes due to CR, with a decrease in metabolic activity over time only in males. Oxidative damage to DNA was also reduced by different pathways between sexes, which may reflect variability in their physiological status and life-history traits at the end of summer. Finally, females' mitochondria seemed to exhibit greater flexibility and greater metabolic potential than males in response to CR. Our results showed strong differences between males and females in response to food shortage during late summer, underlining the necessity to consider sex as a factor for population dynamics in climate change models.
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Affiliation(s)
- Aude Noiret
- Unité Mécanismes Adaptatifs et Evolution (MECADEV), Muséum National d'Histoire Naturelle, CNRS UMR 7179, Brunoy, France
| | - Laura Puch
- Unité Mécanismes Adaptatifs et Evolution (MECADEV), Muséum National d'Histoire Naturelle, CNRS UMR 7179, Brunoy, France
| | - Coralie Riffaud
- Unité Mécanismes Adaptatifs et Evolution (MECADEV), Muséum National d'Histoire Naturelle, CNRS UMR 7179, Brunoy, France
| | - David Costantini
- Unité Physiologie Moléculaire et Adaptation (PhyMA), Muséum National d'Histoire Naturelle, CNRS UMR 7221, Paris, France
| | - Jean-Francois Riou
- Unité Structure et Instabilité des Génomes (STRING), Muséum National d'Histoire Naturelle, CNRS UMR 7196, INSERM U1154, Paris, France
| | - Fabienne Aujard
- Unité Mécanismes Adaptatifs et Evolution (MECADEV), Muséum National d'Histoire Naturelle, CNRS UMR 7179, Brunoy, France
| | - Jeremy Terrien
- Unité Mécanismes Adaptatifs et Evolution (MECADEV), Muséum National d'Histoire Naturelle, CNRS UMR 7179, Brunoy, France
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5
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Schaeffer PJ, O'Mara MT, Breiholz J, Keicher L, Lázaro J, Muturi M, Dechmann DKN. Metabolic rate in common shrews is unaffected by temperature, leading to lower energetic costs through seasonal size reduction. ROYAL SOCIETY OPEN SCIENCE 2020; 7:191989. [PMID: 32431881 PMCID: PMC7211839 DOI: 10.1098/rsos.191989] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Accepted: 03/31/2020] [Indexed: 06/01/2023]
Abstract
Small endothermic mammals have high metabolisms, particularly at cold temperatures. In the light of this, some species have evolved a seemingly illogical strategy: they reduce the size of the brain and several organs to become even smaller in winter. To test how this morphological strategy affects energy consumption across seasonally shifting ambient temperatures, we measured oxygen consumption and behaviour in the three seasonal phenotypes of the common shrew (Sorex araneus), which differ in size by about 20%. Body mass was the main driver of oxygen consumption, not the reduction of metabolically expensive brain mass. Against our expectations, we found no change in relative oxygen consumption with low ambient temperature. Thus, smaller body size in winter resulted in significant absolute energy savings. This finding could only partly be explained by an increase of lower cost behaviours in the activity budgets. Our findings highlight that these shrews manage to avoid one of the most fundamental and intuitive rules of ecology, allowing them to subsist with lower resource availability and successfully survive the harsh conditions of winter.
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Affiliation(s)
| | - M. Teague O'Mara
- Department of Biological Sciences, Southeastern Louisiana University, Hammond LA 70402USA
- Department of Migration, Max Planck Institute of Animal Behavior, am Obstberg 1, 78315 Radolfzell, Germany
- Department of Biology, University of Konstanz, 78462 Konstanz, Germany
| | - Japhet Breiholz
- Department of Migration, Max Planck Institute of Animal Behavior, am Obstberg 1, 78315 Radolfzell, Germany
- Department of Biology, University of Konstanz, 78462 Konstanz, Germany
| | - Lara Keicher
- Department of Migration, Max Planck Institute of Animal Behavior, am Obstberg 1, 78315 Radolfzell, Germany
- Department of Biology, University of Konstanz, 78462 Konstanz, Germany
| | - Javier Lázaro
- Department of Migration, Max Planck Institute of Animal Behavior, am Obstberg 1, 78315 Radolfzell, Germany
- Department of Biology, University of Konstanz, 78462 Konstanz, Germany
| | - Marion Muturi
- Department of Migration, Max Planck Institute of Animal Behavior, am Obstberg 1, 78315 Radolfzell, Germany
- Department of Biology, University of Konstanz, 78462 Konstanz, Germany
| | - Dina K. N. Dechmann
- Department of Migration, Max Planck Institute of Animal Behavior, am Obstberg 1, 78315 Radolfzell, Germany
- Department of Biology, University of Konstanz, 78462 Konstanz, Germany
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6
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Sánchez-Dávila F, Ungerfeld R, Bosque-González ASD, Bernal-Barragán H. Seasonality in Saint Croix male lamb reproductive development in northern Mexico. Reprod Domest Anim 2018; 54:391-400. [DOI: 10.1111/rda.13372] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2018] [Accepted: 11/01/2018] [Indexed: 11/29/2022]
Affiliation(s)
| | - Rodolfo Ungerfeld
- Departamento de Fisiología, Facultad de Veterinaria; Universidad de la República; Montevideo Uruguay
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7
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Leptin levels, seasonality and thermal acclimation in the Microbiotherid marsupial Dromiciops gliroides: Does photoperiod play a role? Comp Biochem Physiol A Mol Integr Physiol 2016; 203:233-240. [PMID: 27705753 DOI: 10.1016/j.cbpa.2016.09.025] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Revised: 09/15/2016] [Accepted: 09/29/2016] [Indexed: 01/09/2023]
Abstract
Mammals of the Neotropics are characterized by a marked annual cycle of activity, which is accompanied by several physiological changes at the levels of the whole organism, organs and tissues. The physiological characterization of these cycles is important, as it gives insight on the mechanisms by which animals adjust adaptively to seasonality. Here we studied the seasonal changes in blood biochemical parameters in the relict South American marsupial Dromiciops gliroides ("monito del monte" or "little mountain monkey"), under semi-natural conditions. We manipulated thermal conditions in order to characterize the effects of temperature and season on a battery of biochemical parameters, body mass and adiposity. Our results indicate that monitos experience an annual cycle in body mass and adiposity (measured as leptin levels), reaching a maximum in winter and a minimum in summer. Blood biochemistry confirms that the nutritional condition of animals is reduced in summer instead of winter (as generally reported). This was coincident with a reduction of several biochemical parameters in summer, such as betahydroxybutyrate, cholesterol, total protein concentration and globulins. Monitos seem to initiate winter preparation during autumn and reach maximum body reserves in winter. Hibernation lasts until spring, at which time they use fat reserves and become reproductively active. Sexual maturation during summer would be the strongest energetic bottleneck, which explains the reductions in body mass and other parameters in this season. Overall, this study suggests that monitos anticipate the cold season by a complex interaction of photoperiodic and thermal cues.
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8
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Rezende EL, Bacigalupe LD. Thermoregulation in endotherms: physiological principles and ecological consequences. J Comp Physiol B 2015; 185:709-27. [PMID: 26025431 DOI: 10.1007/s00360-015-0909-5] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2014] [Revised: 04/18/2015] [Accepted: 04/27/2015] [Indexed: 01/01/2023]
Abstract
In a seminal study published nearly 70 years ago, Scholander et al. (Biol Bull 99:259-271, 1950) employed Newton's law of cooling to describe how metabolic rates (MR) in birds and mammals vary predictably with ambient temperature (T a). Here, we explore the theoretical consequences of Newton's law of cooling and show that a thermoregulatory polygon provides an intuitively simple and yet useful description of thermoregulatory responses in endothermic organisms. This polygon encapsulates the region in which heat production and dissipation are in equilibrium and, therefore, the range of conditions in which thermoregulation is possible. Whereas the typical U-shaped curve describes the relationship between T a and MR at rest, thermoregulatory polygons expand this framework to incorporate the impact of activity, other behaviors and environmental conditions on thermoregulation and energy balance. We discuss how this framework can be employed to study the limits to effective thermoregulation and their ecological repercussions, allometric effects and residual variation in MR and thermal insulation, and how thermoregulatory requirements might constrain locomotor or reproductive performance (as proposed, for instance, by the heat dissipation limit theory). In many systems the limited empirical knowledge on how organismal traits may respond to environmental changes prevents physiological ecology from becoming a fully developed predictive science. In endotherms, however, we contend that the lack of theoretical developments that translate current physiological understanding into formal mechanistic models remains the main impediment to study the ecological and evolutionary repercussions of thermoregulation. In spite of the inherent limitations of Newton's law of cooling as an oversimplified description of the mechanics of heat transfer, we argue that understanding how systems that obey this approximation work can be enlightening on conceptual grounds and relevant as an analytical and predictive tool to study ecological phenomena. As such, the proposed approach may constitute a powerful tool to study the impact of thermoregulatory constraints on variables related to fitness, such as survival and reproductive output, and help elucidating how species will be affected by ongoing climate change.
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Affiliation(s)
- Enrico L Rezende
- Department of Life Sciences, University of Roehampton, Holybourne Avenue, London, SW15 4JD, UK.
| | - Leonardo D Bacigalupe
- Instituto de Ciencias Ambientales y Evolutivas, Universidad Austral de Chile, Valdivia, Chile.
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9
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White JT, DeSanto CL, Gibbons C, Lardner CK, Panakos A, Rais S, Sharp K, Sullivan SD, Tidhar W, Wright L, Berrigan D, Heideman PD. Insulins, leptin and feeding in a population of Peromyscus leucopus (white-footed mouse) with variable fertility. Horm Behav 2014; 66:169-79. [PMID: 24583085 DOI: 10.1016/j.yhbeh.2014.02.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/15/2013] [Revised: 02/09/2014] [Accepted: 02/18/2014] [Indexed: 02/03/2023]
Abstract
This article is part of a Special Issue "Energy Balance". Natural populations display a variety of reproductive responses to environmental cues, but the underlying physiology that causes these responses is largely unknown. This study tested the hypothesis that heritable variation in reproductive traits can be described by heritable variation in concentrations of hormones critical to both energy balance and reproduction. To test this hypothesis, we used mouse lines derived from a wild population and selectively bred for response to short day photoperiod. Reproductive and metabolic traits of Peromyscus leucopus display heritable variation when held in short photoperiods typical of winter. Our two lines of mice have phenotypes spanning the full range of variation observed in nature in winter. We tested male and female mice for heritable variation in fasted serum concentrations of three hormones involved in energetic regulation: leptin, insulin-like growth factor 1 (IGF-1) and insulin, as well as the effects of exogenous leptin and a high energy diet on reproductive maturation. Exogenous leptin decreased food intake, but protected males from the reduction in testis mass caused by equivalent food restriction in pair-fed, saline-infused controls. A high energy diet resulted in calorie adjustment by the mice, and failed to alter reproductive phenotype. Concentrations of the three hormones did not differ significantly between selection lines but had correlations with measures of food intake, fertility, blood glucose, and/or body mass. There was evidence of interactions between reproductive traits and hormones related to energy balance and reproduction, but this study did not find evidence that variation in these hormones caused variation in reproductive phenotype.
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Affiliation(s)
- Jordan T White
- Department of Biology, College of William and Mary, Williamsburg, VA, USA; Department of Biology, Johns Hopkins University, Baltimore, MD, USA.
| | - Cori L DeSanto
- Department of Biology, College of William and Mary, Williamsburg, VA, USA.
| | - Connie Gibbons
- Department of Biology, College of William and Mary, Williamsburg, VA, USA.
| | - Casey K Lardner
- Department of Biology, College of William and Mary, Williamsburg, VA, USA.
| | - Andrew Panakos
- Department of Biology, College of William and Mary, Williamsburg, VA, USA.
| | - Salehin Rais
- Department of Biology, College of William and Mary, Williamsburg, VA, USA.
| | - Kathy Sharp
- Department of Biology, College of William and Mary, Williamsburg, VA, USA.
| | - Shannon D Sullivan
- Department of Biology, College of William and Mary, Williamsburg, VA, USA.
| | - Wendy Tidhar
- Department of Biology, College of William and Mary, Williamsburg, VA, USA.
| | - Leanne Wright
- Department of Biology, College of William and Mary, Williamsburg, VA, USA.
| | - David Berrigan
- Applied Research Program, Division of Cancer Control and Population Sciences, National Cancer Institute, Bethesda, MD 20892, USA.
| | - Paul D Heideman
- Department of Biology, College of William and Mary, Williamsburg, VA, USA.
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10
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Wang G, Getz LL, Linzey AV, Slade NA, Kesner MH. Fast and slow dynamics of northern small mammal populations. Ecol Modell 2012. [DOI: 10.1016/j.ecolmodel.2011.11.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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11
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Rowe RJ, Terry RC, Rickart EA. Environmental change and declining resource availability for small-mammal communities in the Great Basin. Ecology 2011; 92:1366-75. [DOI: 10.1890/10-1634.1] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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12
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Nicolai A, Filser J, Briand V, Charrier M. Seasonally contrasting life-history strategies in the land snail Cornu aspersum: physiological and ecological implications. CAN J ZOOL 2010. [DOI: 10.1139/z10-066] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
When a life history is characterized by both seasonality in reproduction and seasonality in offspring fitness, trade-offs in reproductive traits might be adjustments to seasonal time constraints to optimize reproductive success. Therefore, we compared in the laboratory the trade-offs in reproductive traits between early (after maturity) and delayed (after dormancy) reproduction in young land snails Cornu aspersum (Müller, 1774) (syn. Helix aspersa ), depending on food energy content. We also investigated the maternal investment in reproductive output in both breeding periods. After attaining maturity, snails produced single clutches with many small eggs, which resulted, in contrast to previous studies, in large offspring with a low hatching rate owing to high within-clutch cannibalism. The young cannibals may have a higher survival probability in the following hibernation. Snails starting to reproduce after hibernation had smaller clutches of larger eggs, resulting in high quantity of lighter offspring. The clutch mass was positively correlated with maternal mass in snails reproducing after having attained maturity and negatively correlated in snails reproducing after hibernation. Multiple oviposition occurred only after hibernation, thereby enhancing reproductive success. An energy-rich diet did not affect reproductive strategies. Further studies should focus on seasonal plasticity of reproductive strategies in natural populations of C. aspersum and investigate survival probabilities of breeders and juveniles in an evolutionary context.
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Affiliation(s)
- A. Nicolai
- University of Rennes 1, Unité Mixte de Recherche, Centre National de la Recherche Scientifique N° 6553 EcoBio, Campus de Beaulieu, F-35042 Rennes CEDEX, France
- University of Economy and Environment Nürtingen-Geislingen, IAF, Schelmenwasen 4-8, D-72622 Nürtingen, Germany
- University of Bremen, UFT, Department of Ecology, Leobener Strasse, Bremen D-28359, Germany
| | - J. Filser
- University of Rennes 1, Unité Mixte de Recherche, Centre National de la Recherche Scientifique N° 6553 EcoBio, Campus de Beaulieu, F-35042 Rennes CEDEX, France
- University of Economy and Environment Nürtingen-Geislingen, IAF, Schelmenwasen 4-8, D-72622 Nürtingen, Germany
- University of Bremen, UFT, Department of Ecology, Leobener Strasse, Bremen D-28359, Germany
| | - V. Briand
- University of Rennes 1, Unité Mixte de Recherche, Centre National de la Recherche Scientifique N° 6553 EcoBio, Campus de Beaulieu, F-35042 Rennes CEDEX, France
- University of Economy and Environment Nürtingen-Geislingen, IAF, Schelmenwasen 4-8, D-72622 Nürtingen, Germany
- University of Bremen, UFT, Department of Ecology, Leobener Strasse, Bremen D-28359, Germany
| | - M. Charrier
- University of Rennes 1, Unité Mixte de Recherche, Centre National de la Recherche Scientifique N° 6553 EcoBio, Campus de Beaulieu, F-35042 Rennes CEDEX, France
- University of Economy and Environment Nürtingen-Geislingen, IAF, Schelmenwasen 4-8, D-72622 Nürtingen, Germany
- University of Bremen, UFT, Department of Ecology, Leobener Strasse, Bremen D-28359, Germany
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13
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Tabacaru CA, Millar JS, Longstaffe FJ, Ansell AK. Seasonal breeding in relation to dietary animal protein in deer mice (Peromyscus maniculatus). CAN J ZOOL 2010. [DOI: 10.1139/z10-027] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We used stable carbon and nitrogen isotope compositions of hair and liver as a way of examining seasonal diet changes and explaining seasonal breeding in deer mice ( Peromyscus maniculatus (Wagner, 1845)). Summer and winter δ13C values differed, which is attributed to the availability of different plant tissues (C3 plants). The δ15N values of liver showed a decrease in consumed animal protein during winter, but the difference was not large enough to indicate a full trophic level change in diet from summer to winter. The δ15N values of hair remained constant across the seasons, which is attributed to a continuous level of moulting throughout the year. Our data indicate that lowered food quality in the form of reduced dietary animal protein intake may play a role in the cessation of breeding in deer mice in winter.
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Affiliation(s)
- C. A. Tabacaru
- Department of Biology, The University of Western Ontario, 1151 Richmond Street, London, ON N6A 5B7, Canada
- Department of Earth Sciences, The University of Western Ontario, 1151 Richmond Street, London, ON N6A 5B7, Canada
| | - J. S. Millar
- Department of Biology, The University of Western Ontario, 1151 Richmond Street, London, ON N6A 5B7, Canada
- Department of Earth Sciences, The University of Western Ontario, 1151 Richmond Street, London, ON N6A 5B7, Canada
| | - F. J. Longstaffe
- Department of Biology, The University of Western Ontario, 1151 Richmond Street, London, ON N6A 5B7, Canada
- Department of Earth Sciences, The University of Western Ontario, 1151 Richmond Street, London, ON N6A 5B7, Canada
| | - A. K. Ansell
- Department of Biology, The University of Western Ontario, 1151 Richmond Street, London, ON N6A 5B7, Canada
- Department of Earth Sciences, The University of Western Ontario, 1151 Richmond Street, London, ON N6A 5B7, Canada
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Tassino B, Passos CA. Reproductive biology of Río Negro tuco-tuco, Ctenomys rionegrensis (Rodentia: Octodontidae). Mamm Biol 2010. [DOI: 10.1016/j.mambio.2009.03.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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15
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Kościński K, Kozłowska-Rajewicz A, Górecki MT, Kamyczek M, Rózycki M. Month-of-birth effect on further body size in a pig model. HOMO-JOURNAL OF COMPARATIVE HUMAN BIOLOGY 2009; 60:159-83. [PMID: 19162263 DOI: 10.1016/j.jchb.2008.02.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2007] [Accepted: 02/03/2008] [Indexed: 10/21/2022]
Abstract
Previous studies unanimously confirmed the existence of a dependence of human body size on the month of birth. The cause of the phenomenon has not been identified yet, although some possible causes were proposed e.g. seasonal changes of climatic and nutritional conditions. This study explored the issue in an animal model of 20,513 pigs. We found that body weights of 6-month-old pigs were the highest for subjects born in February, but for 2-month-old pigs the peak fell in May. Any statistical correlation between the month of birth and later body weight may be induced by (1) a long-term effect of the month of birth on further growth potential (LTE), or by (2) a short-term effect of seasonal factors differentiating the growth rate (STE), so we developed a mathematical method to separate the effects. The analysis proved that (1) the observed correlations resulted only from the STE, with May-June being the months of the highest growth tempo, and that (2) there was no significant LTE. The short-term effect was responsible for differences between patterns of weight for 2- and 6-month-old animals by the month of birth: since a pig monthly gain of weight increases with age, it is favorable for it to be born in February to attain the greatest weight at the age of 6 months, whereas 2-month-old piglets are heaviest when born a month or two before the May/June optimum for growth. The lack of a long-term effect of the month of birth on pigs' weight supports the hypothesis of the cultural character of factor(s) responsible for the relationship between the month of birth and later body size in humans.
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Affiliation(s)
- K Kościński
- Department of Human Population Ecology, Institute of Anthropology, Adam Mickiewicz University, 61-701 Poznań, Poland.
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Nespolo RF, Bacigalupe LD. Viability selection on early body mass and the effect of female body size on fecundity: a study on the leaf-eared mouse Phyllotis darwini. Ecol Res 2008. [DOI: 10.1007/s11284-008-0570-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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17
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Nespolo RF, Franco M. Whole-animal metabolic rate is a repeatable trait: a meta-analysis. ACTA ACUST UNITED AC 2007; 210:2000-5. [PMID: 17515425 DOI: 10.1242/jeb.02780] [Citation(s) in RCA: 163] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Repeatability studies are gaining considerable interest among physiological ecologists, particularly in traits affected by high environmental/residual variance, such as whole-animal metabolic rate (MR). The original definition of repeatability, known as the intraclass correlation coefficient, is computed from the components of variance obtained in a one-way ANOVA on several individuals from which two or more measurements are performed. An alternative estimation of repeatability, popular among physiological ecologists, is the Pearson product-moment correlation between two consecutive measurements. However, despite the more than 30 studies reporting repeatability of MR, so far there is not a definite synthesis indicating: (1) whether repeatability changes in different types of animals; (2) whether some kinds of metabolism are more repeatable than others; and most important, (3) whether metabolic rate is significantly repeatable. We performed a meta-analysis to address these questions, as well as to explore the historical trend in repeatability studies. Our results show that metabolic rate is significantly repeatable and its effect size is not statistically affected by any of the mentioned factors (i.e. repeatability of MR does not change in different species, type of metabolism, time between measurements, and number of individuals). The cumulative meta-analysis revealed that repeatability studies in MR have already reached an asymptotical effect size with no further change either in its magnitude and/or variance (i.e. additional studies will not contribute significantly to the estimator). There was no evidence of strong publication bias.
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Affiliation(s)
- Roberto F Nespolo
- Instituto de Ecología y Evolución, Universidad Austral de Chile, Casilla 567, Valdivia, Chile.
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Nespolo RF, Bustamante DM, Bacigalupe LD, Bozinovic F. QUANTITATIVE GENETICS OF BIOENERGETICS AND GROWTH‐RELATED TRAITS IN THE WILD MAMMAL, PHYLLOTIS DARWINI. Evolution 2005. [DOI: 10.1111/j.0014-3820.2005.tb01829.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Roberto F. Nespolo
- Instituto de Ecologia y Evoluciún, Facultad de Ciencias, Universidad Austral de Chile, Casilla 567, Valdivia, Chile
| | - Diego M. Bustamante
- Center for Advanced Studies in Ecology and Biodiversity, Departamento de Ecologia, Facultad de Ciencias Biolúgicas, Pontificia Universidad Católica de Chile, Santiago, 6513677, Chile
| | - Leonardo D. Bacigalupe
- Center for Advanced Studies in Ecology and Biodiversity, Departamento de Ecologia, Facultad de Ciencias Biolúgicas, Pontificia Universidad Católica de Chile, Santiago, 6513677, Chile
| | - Francisco Bozinovic
- Center for Advanced Studies in Ecology and Biodiversity, Departamento de Ecologia, Facultad de Ciencias Biolúgicas, Pontificia Universidad Católica de Chile, Santiago, 6513677, Chile
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Nespolo RF, Bustamante DM, Bacigalupe LD, Bozinovic F. QUANTITATIVE GENETICS OF BIOENERGETICS AND GROWTH-RELATED TRAITS IN THE WILD MAMMAL, PHYLLOTIS DARWINI. Evolution 2005. [DOI: 10.1554/04-408.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Díaz M, Alonso CL. WOOD MOUSE APODEMUS SYLVATICUS WINTER FOOD SUPPLY: DENSITY, CONDITION, BREEDING, AND PARASITES. Ecology 2003. [DOI: 10.1890/02-0534] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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