scholarly journals Experimental demonstration of the growth rate–lifespan trade-off

2013 ◽  
Vol 280 (1752) ◽  
pp. 20122370 ◽  
Author(s):  
Who-Seung Lee ◽  
Pat Monaghan ◽  
Neil B. Metcalfe
Keyword(s):  
Growth Rate ◽  
Gasterosteus Aculeatus ◽  
Negative Relationship ◽  
Adult Life ◽  
Normal Growth ◽  
Adult Size ◽  
Final Size ◽  
Trade Off ◽  
Median Lifespan ◽  
Catch Up

The hypothesized negative relationship between growth rate and lifespan has proved very difficult to test robustly because of potentially confounding variables, particularly nutrient availability and final size. Here we provide, to our knowledge, the first rigorous experimental test of this hypothesis, and find dramatic changes in lifespan in the predicted direction in response to both upward and downward manipulations of growth rates. We used brief (less than 4% of median lifespan) exposure to relatively cold or warm temperatures early in life to deflect juvenile three-spined sticklebacks Gasterosteus aculeatus from their normal growth trajectories; this induced catch-up or slowed-down growth when ambient temperatures were restored, and all groups attained the same average adult size. Catch-up growth led to a reduction in median lifespan of 14.5 per cent, while slowed-down growth extended lifespan by 30.6 per cent. These lifespan effects were independent of eventual size attained or reproductive investment in adult life. Photoperiod manipulations showed that the effects of compensatory growth on lifespan were also influenced by time available for growth prior to breeding, being more extreme when less time was available. These results demonstrate the growth–lifespan trade-off. While growing more slowly can increase longevity, the optimal resolution of the growth–lifespan trade-off is influenced by time constraints in a seasonal environment.

Geographical variation in life-history traits suggests an environmental-dependent trade-off between juvenile growth rate and adult lifespan in a moth

2019 ◽  
Vol 109 (05) ◽  
pp. 626-632 ◽  
Author(s):  
C. Chen ◽  
H. Yang ◽  
F. Xue ◽  
Q. Xia
Keyword(s):  
Growth Rate ◽  
Life History ◽  
Life History Traits ◽  
Southern China ◽  
Negative Relationship ◽  
Adult Size ◽  
Juvenile Growth ◽  
Trade Off ◽  
Adult Lifespan ◽  
Significant Difference

AbstractLife-history theory predicts a trade-off between the juvenile growth rate and adult traits related to survival. However, this hypothesized negative correlation is difficult to test robustly because many trade-offs are mild, and environmental variables, such as changes in nutrient availability, can ameliorate the trade-off or make it more pronounced. Thus, it is reasonable to expect that the expression of the trade-off can be condition-dependent. In the present study, we first examined the pre-adult life-history traits of the cotton bollworm, Helicoverpa armigera, collected from northern, central, and southern China at different temperatures. We found that the northern China population has a significantly shorter pre-adult developmental time and higher growth rate than the southern China population as a result of adaptation to the decreased seasonal length. Then, we tested for a trade-off between the juvenile growth rate and adult lifespan in different temperature and nutrient conditions. We found a negative relationship between juvenile growth rate and adult lifespan under starvation or desiccation conditions; however, a continuous supply of sugar can diminish or obviate the apparent negative relationship, in which the adult lifespan did not show a significant difference in most of the comparisons. These results suggested a resource-mediated trade-off may exist between juvenile growth rate and adult lifespan. However, the adult size may have some positive effect on the lifespan under starvation and desiccation conditions, which may affect the expression of trade-off.

scholarly journals Magnitude and pattern of compensatory growth in rats after cold exposure

Development ◽  
1969 ◽  
Vol 21 (3) ◽  
pp. 407-416
Author(s):  
Marjorie M. C. Lee ◽  
P. C. Chu ◽  
H. C. Chan
Keyword(s):  
Growth Rate ◽  
Compensatory Growth ◽  
Relative Rate ◽  
Normal Growth ◽  
The Other ◽  
Regulatory Control ◽  
Catch Up ◽  
Common Observation ◽  
The Individual ◽  
Favorable Conditions

It is a common observation that normal growth is affected or suppressed in young individuals by environmental adversities and physical disturbances. On the other hand, when health or favorable conditions are restored, the tempo of growth promptly accelerates as if the individual is trying to make up for the growth debt incurred. Tanner has referred to this increased growth rate after diseases or starvation as compensatory or ‘catch-up’ growth, a topic on which he has written eloquently and fully in a number of articles (1963 a, b). He considers this compensatory growth as a ‘self-stabilizing’ or ‘target-seeking’ phenomenon in the regulatory control of growth. Growth of young rats is slowed by severe cold and increased by warmth (Heroux & Gridgeman, 1958; Chevillard, Portet & Cadot, 1963). The aim of the present investigation is to show the magnitude and pattern of compensatory growth in rats after single and repeated cold exposures; to evaluate age differentials in this response; and to study the pattern and relative rate of compensatory growth in the various bony segments of the appendages.

Panel Data Analysis of Determinants of Leverage in the Automobile Industry in India

GIS Business ◽  
2018 ◽  
Vol 13 (2) ◽  
pp. 29-47
Author(s):  
Vibha Tripathi
Keyword(s):  
Panel Data ◽  
Capital Structure ◽  
Automobile Industry ◽  
Panel Data Analysis ◽  
Negative Relationship ◽  
Order Theory ◽  
Ordinary Least Squares ◽  
Pecking Order ◽  
Trade Off ◽  
Coverage Ratio

The study tries to investigate the key determinants of capital structure of leading automobile companies and the Automobile Industry in India. The study also tracks the theory implications, i.e. trade off vs. pecking order in these firms and the industry in general. An attempt is to see, if individually each sample company and the whole industry are influenced by the same determinants of capital structure. Pooled ordinary least squares and panel data econometric techniques such as fixed effect models are used to investigate the most significant determinants that affect the capital structure choice of 10 leading companies categorized as BSE Auto Top 100 and the Automobile Industry as a whole for a period of 14 years from 2000–2001 to 2013–2014. The study reveals some interesting facts and results. Multiple regression analysis reveals that while profitability and size are significant determinants in most of the leading companies; NDTS, Growth, and Debt service coverage ratio are not significant for these companies. While the Panel data results of the Automobile Industry as a whole reveals that profitability is the only significant determinant having negative relationship with debt equity ratio; and the other variables are insignificant. Also individual companies coefficient results shows implications of mix of pecking order and trade off theories while the panel data results of the whole Industry strongly supports the Pecking order theory.

Nitrogen use efficiency: does a trade-off exist between the N productivity and the mean residence time within species?

2008 ◽  
Vol 56 (3) ◽  
pp. 272 ◽  
Author(s):  
Zhi Y. Yuan ◽  
Han Y. H. Chen ◽  
Ling H. Li
Keyword(s):  
Residence Time ◽  
Nitrogen Use Efficiency ◽  
Mean Residence Time ◽  
Negative Relationship ◽  
Controlled Experiments ◽  
Nitrogen Use ◽  
Trade Off ◽  
N Supply ◽  
Use Efficiency ◽  
The Mean

Nitrogen use efficiency (NUE) can be divided into two components, i.e. N productivity (A) and the mean residence time (MRT). Controlled experiments indicate that there is not a trade-off between A and MRT within species, but this theory has not been well tested in field conditions. Here, we studied the A, MRT and NUE of Stipa krylovii Roshev. in a grassland over 4 years of N fertilisation experimentation. The three parameters (A, MRT and NUE) were significantly related to soil N supply and there was a negative relationship between A and MRT within this species (r = –0.775, P < 0.05), i.e. plants with higher A had lower MRT. Our results showed a trade-off between A and MRT within this Stipa species and this observed trade-off was attributed to different responses of A and MRT to soil fertility.

scholarly journals Chronic Myeloid Leukemia in Children and Adolescents: The Achilles Heel of Oncogenesis and Tyrosine Kinase Inhibitors

2021 ◽  
Vol 22 (15) ◽  
pp. 7806
Author(s):  
Maria Moschovi ◽  
Charikleia Kelaidi
Keyword(s):  
Chronic Myeloid Leukemia ◽  
Children And Adolescents ◽  
Myeloid Leukemia ◽  
Kinase Inhibitors ◽  
Hematopoietic Cell Transplantation ◽  
Adult Life ◽  
Normal Growth ◽  
Molecular Response ◽  
Treatment Paradigm ◽  
Treatment Free Remission

Chronic myeloid leukemia (CML) is a rare disease in children and adolescents. The goal of therapy in children and adolescents is normal life expectancy, without compromising normal growth and development and potential for achievement of milestones in adult life. The perspective of cure is also reflected in the goal of treatment-free remission, with its surrogate markers, such as deep molecular response, also becoming the new endpoints of therapy efficacy in children and adolescents. Chronic myeloid leukemia was a fatal disease to children and adolescents in the past. Following the treatment paradigm of imatinib, it became a chronic disease with the potential of complete remission and even cure without the long-term hazards of allogeneic hematopoietic cell transplantation. The diagnosis and treatment of CML affect a child’s trajectory through life and important physiological events like development and procreation.

Immature development and adult eclosion of Ufens principalis Owen (Hymenoptera: Trichogrammatidae), an egg parasitoid of Homalodisca spp. (Hemiptera: Cicadellidae) in southern California

2009 ◽  
Vol 100 (4) ◽  
pp. 467-479 ◽  
Author(s):  
A.K. Al-Wahaibi ◽  
J.G. Morse
Keyword(s):  
Southern California ◽  
Negative Relationship ◽  
Adult Emergence ◽  
Egg Parasitoid ◽  
Adult Size ◽  
Adult Eclosion ◽  
Late Night ◽  
Immature Development ◽  
Yellow Orange ◽  
Theoretical Minimum

AbstractThe biology of the immature stages and adult eclosion of Ufens principalis Owen, an important parasitoid of Homalodisca eggs in southern California, were studied. The duration of the egg, larval and pupal stages at 26.7°C were 0–1, 7 and 9 days, respectively. Sacciform larvae, which developed gregariously within host eggs, were motile until about five days of age, and then became sessile. Parasitized host eggs changed from whitish and soft when freshly-laid to yellow-orange and hard at five days and older. This change was accompanied by formation of septal walls separating the mature larvae and pupae. The rate of immature development had a strong positive linear relationship (R2=0.853, n=98) with temperatures in the range of 20.0–30.3°C. The theoretical minimum threshold for immature development was 13.5°C, and the required heat units were 241.0 degree-days. Adult eclosion from host eggs occurred mostly (85%) on the first two days of emergence. Although most females emerged during the morning hours (0600–1200 h), males tended to emerge earlier than females with equal emergence during the morning and late night hours (2400–0600 h). The rate of successful adult emergence was high (88%). The ratio of eclosed adults to the number of exit holes was 1.18, indicating that most adults tended to independently cut their exit holes. The number of exit holes had a strong negative relationship (R2=0.711, n=125) with exit hole size, suggesting that larger numbers of developing immatures per host egg result in an overall decrease in adult size.

GROWTH AND DEVELOPMENT OF THE CHILD

PEDIATRICS ◽  
1979 ◽  
Vol 64 (5) ◽  
pp. 591-591
Author(s):  
Keyword(s):  
Birth Weight ◽  
Adult Life ◽  
Developed Countries ◽  
Infant Mortality Rate ◽  
Physical Growth ◽  
Rural Populations ◽  
Vicious Cycle ◽  
Catch Up ◽  
The Individual ◽  
Dramatic Consequence

Deaths of infants and of their mothers may be the most dramatic consequence of ill health, but there are other serious consequences which affect the child and, indeed, may follow it throughout adult life. The damage done by infections and associated malnutrition to a young child in its formative years is manifested in retarded physical growth and mental development, which it may never be able to catch up on, thus impairing the potential for a full and active adult life. Poverty, ignorance, and ill health thus create a vicious cycle spanning from one generation to the next, and from which the individual has little chance of escape. A striking expression of this generation link is the frequency of "low birth weight" (LBW) babies, ie, babies weighing less than 2500 gm at birth. It is now known that this frequency is closely determined by the same adverse maternal and environmental factors which determine the nutritional status of the mother. It has also been observed in developed countries that the frequency is higher among mothers who smoke during pregnancy. About 21 million LBW (small for date) babies are born each year, the greatest majority of them in developing countries. The observed incidence rate ranges from about 4% in the most developed countries to over 30% in some poor rural populations. It is also known that LBW is the single most important factor determining the survival chances of the child. The infant mortality rate is about 20 times greater for all LBW babies than for other babies, and the lower the birth weight the lower is the survival chance.

scholarly journals LASTING BIOLOGICAL EFFECTS OF EARLY ENVIRONMENTAL INFLUENCES

1968 ◽  
Vol 127 (4) ◽  
pp. 801-818 ◽  
Author(s):  
Egilde Seravalli ◽  
René Dubos
Keyword(s):  
Growth Rate ◽  
Mouse Embryo ◽  
Bacterial Infections ◽  
Biological Effects ◽  
Intestinal Flora ◽  
Adult Life ◽  
Tissue Cultures ◽  
Depressing Effect ◽  
Genetic Stock ◽  
Adult Weight

Certain specific-pathogen-free (SPF) mice bred and maintained under semiprotected conditions have an intestinal flora which is qualitatively simpler (although not quantitatively smaller) than that of mice of the same genetic stock produced under ordinary conditions. They are also heavier at weaning time, grow at a faster rate, and reach a greater adult weight than ordinary mice. When SPF mice are contaminated per os shortly after birth with certain bacterial cultures isolated from the intestinal contents of adult ordinary mice, these bacteria multiply extensively throughout the gastrointestinal tract and persist at extremely high levels until weaning time. Such bacterial infections do not affect significantly either weaning weight, growth rate, or maximum adult weight. In contrast, weight depression could be consistently brought about by contaminating newborn SPF mice per os with bacteria-free filtrates of homogenates of intestines from ordinary mice. The weight-depressing agent passed through Millipore discs of 0.45 and 0.22 µ porosity, but was held back at 0.10 µ porosity. The depression of weight caused by either intestine homogenate or filtrates thereof could be detected within a few days after contamination (of 2 day old mice) and persisted throughout the adult life of the contaminated animals. When intestine homogenate of the SPF mice used in this study were introduced per os into newborn SPF mice, they did not affect their growth rate or adult weight. On several occasions, but not consistently, bacteria-free filtrates capable of depressing the weight curve of SPF mice produced alterations in the appearance of tissue cultures of BHK-21 and mouse embryo cells. When tissue cultures so infected were introduced into newborn SPF mice, the weight of these animals was depressed early and lastingly. An agent exhibiting weight-depressing activity has been transferred from mouse to mouse over many passages by contaminating newborn SPF animals per os. Weight depression was achieved with extremely small doses of material (10–5 ml of intestine homogenate of 10–4 of mouse embryo culture). Under these conditions, none of the animals showed obvious signs of disease except reduced weight. Only very young SPF mice (preferably less than 3 days old) proved susceptible to the weight-depressing effect of the filtrates of intestine homogenates or of infected tissue cultures prepared therefrom. After oral contamination, it took approximately 1 wk before the intestinal homogenate obtained from contaminated animals exhibited a high level of weight-depressing activity. The growth-depressing effect could be transmitted from one generation to the next by mating SPF mice that had been contaminated shortly after birth and that were consequently smaller than control SPF animals.

scholarly journals Escherichia colipopulations adapt to complex, unpredictable fluctuations without any trade-offs across environments

2016 ◽  
Author(s):  
Shraddha Karve ◽  
Devika Bhave ◽  
Dhanashri Nevgi ◽  
Sutirth Dey
Keyword(s):  
Escherichia Coli ◽  
Growth Rate ◽  
Growth Rates ◽  
Complex Environments ◽  
Multiple Stresses ◽  
Trade Off ◽  
Trade Offs ◽  
Fluctuating Environments ◽  
Laboratory Populations ◽  
Lower Variation

AbstractIn nature, organisms are simultaneously exposed to multiple stresses (i.e. complex environments) that often fluctuate unpredictably. While both these factors have been studied in isolation, the interaction of the two remains poorly explored. To address this issue, we selected laboratory populations ofEscherichia coliunder complex (i.e. stressful combinations of pH, H2O2and NaCl) unpredictably fluctuating environments for ~900 generations. We compared the growth rates and the corresponding trade-off patterns of these populations to those that were selected under constant values of the component stresses (i.e. pH, H2O2and NaCl) for the same duration. The fluctuation-selected populations had greater mean growth rate and lower variation for growth rate over all the selection environments experienced. However, while the populations selected under constant stresses experienced severe tradeoffs in many of the environments other than those in which they were selected, the fluctuation-selected populations could by-pass the across-environment trade-offs completely. Interestingly, trade-offs were found between growth rates and carrying capacities. The results suggest that complexity and fluctuations can strongly affect the underlying trade-off structure in evolving populations.

scholarly journals Catch-Up Growth after Hypothyroidism Is Caused by Delayed Growth Plate Senescence

Endocrinology ◽  
2008 ◽  
Vol 149 (4) ◽  
pp. 1820-1828 ◽  
Author(s):  
Rose Marino ◽  
Anita Hegde ◽  
Kevin M. Barnes ◽  
Lenneke Schrier ◽  
Joyce A. Emons ◽  
...  
Keyword(s):  
Growth Rate ◽  
Growth Inhibition ◽  
Growth Plate ◽  
Bone Growth ◽  
Structural Characteristics ◽  
Linear Growth Rate ◽  
Growth Plate Chondrocytes ◽  
Growth Plates ◽  
Catch Up ◽  
Growth Inhibiting

Catch-up growth is defined as a linear growth rate greater than expected for age after a period of growth inhibition. We hypothesized that catch-up growth occurs because growth-inhibiting conditions conserve the limited proliferative capacity of growth plate chondrocytes, thus slowing the normal process of growth plate senescence. When the growth-inhibiting condition resolves, the growth plates are less senescent and therefore grow more rapidly than normal for age. To test this hypothesis, we administered propylthiouracil to newborn rats for 8 wk to induce hypothyroidism and then stopped the propylthiouracil to allow catch-up growth. In untreated controls, the growth plates underwent progressive, senescent changes in multiple functional and structural characteristics. We also identified genes that showed large changes in mRNA expression in growth plate and used these changes as molecular markers of senescence. In treated animals, after stopping propylthiouracil, these functional, structural, and molecular senescent changes were delayed, compared with controls. This delayed senescence included a delayed decline in longitudinal growth rate, resulting in catch-up growth. The findings demonstrate that growth inhibition due to hypothyroidism slows the developmental program of growth plate senescence, including the normal decline in the rate of longitudinal bone growth, thus accounting for catch-up growth.

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