scholarly journals The evolution of parental effects when selection acts on fecundity versus viability

2019 ◽  
Author(s):  
Bram Kuijper ◽  
Rufus A. Johnstone
Keyword(s):  
Local Environment ◽  
Structured Populations ◽  
Parental Effects ◽  
Viability Selection ◽  
Fecundity Selection ◽  
Two Generations ◽  
Local Patch ◽  
Parental Phenotype ◽  
Viscous Population

AbstractMost predictions on the evolution of adaptive parental effects and phenotypic memory exclusively focus on the role of the abiotic environment. How parental effects are affected by population demography and life history is less well understood. To overcome this, we use an analytical model to assess whether selection acting on fecundity versus viability affects the evolution of parental effects in a viscous population experiencing a spatiotemporally varying environment. We find that parental effects commonly evolve in regimes of viability selection, but are less likely to evolve in regimes of fecundity selection. In regimes of viability selection, an individual’s phenotype becomes correlated with its local environment during its lifetime, as those individuals with a locally adapted phenotype are more likely to survive until parenthood. Hence, a parental phenotype rapidly becomes an informative cue about its local environment, favoring the evolution of parental effects. By contrast, in regimes of fecundity selection, locally maladapted and adapted parents survive at equal rates, so that the parental phenotype, by itself, is not informative about the local environment. Correlations between phenotype and environment still arise, but only when more fecund, locally adapted individuals leave more successfully established offspring to the local patch. Hence, correlations take at least two generations to develop, making them more sensitive to distortion by environmental change or competition with immigrant offspring. Hence, we conclude that viability selection is most conducive to the evolution of adaptive parental effects in spatially structured populations.

scholarly journals Evolution of epigenetic transmission when selection acts on fecundity versus viability

2021 ◽  
Vol 376 (1826) ◽  
Author(s):  
Bram Kuijper ◽  
Rufus A. Johnstone
Keyword(s):  
Environmental Change ◽  
Genetic Factors ◽  
Local Environment ◽  
Parental Effects ◽  
Viability Selection ◽  
Survival Selection ◽  
Fecundity Selection ◽  
Local Patch ◽  
Parental Phenotype

Existing theory on the evolution of parental effects and the inheritance of non-genetic factors has mostly focused on the role of environmental change. By contrast, how differences in population demography and life history affect parental effects is poorly understood. To fill this gap, we develop an analytical model to explore how parental effects evolve when selection acts on fecundity versus viability in spatio-temporally fluctuating environments. We find that regimes of viability selection, but not fecundity selection, are most likely to favour parental effects. In the case of viability selection, locally adapted phenotypes have a higher survival than maladapted phenotypes and hence become enriched in the local environment. Hence, simply by being alive, a parental phenotype becomes correlated to its environment (and hence informative to offspring) during its lifetime, favouring the evolution of parental effects. By contrast, in regimes of fecundity selection, correlations between phenotype and environment develop more slowly: this is because locally adapted and maladapted parents survive at equal rates (no survival selection), so that parental phenotypes, by themselves, are uninformative about the local environment. However, because locally adapted parents are more fecund, they contribute more offspring to the local patch than maladapted parents. In case these offspring are also likely to inherit the adapted parents’ phenotypes (requiring pre-existing inheritance), locally adapted offspring become enriched in the local environment, resulting in a correlation between phenotype and environment, but only in the offspring’s generation. Because of this slower build-up of a correlation between phenotype and environment essential to parental effects, fecundity selection is more sensitive to any distortions owing to environmental change than viability selection. Hence, we conclude that viability selection is most conducive to the evolution of parental effects. This article is part of the theme issue ‘How does epigenetics influence the course of evolution?’

scholarly journals Parental effects and the evolution of phenotypic memory

2015 ◽  
Author(s):  
Bram Kuijper ◽  
Rufus A Johnstone
Keyword(s):  
Local Environment ◽  
Parental Effects ◽  
Bet Hedging ◽  
Changing Environments ◽  
Structured Population ◽  
Different Types ◽  
Parental Phenotype ◽  
Selection For ◽  
Nongenetic Inheritance

Abstract Despite growing evidence for nongenetic inheritance, the ecological conditions that favor the evolution of heritable parental or grandparental effects remain poorly understood. Here, we systematically explore the evolution of parental effects in a patch-structured population with locally changing environments. When selection favors the production of a mix of offspring types, this mix differs according to the parental phenotype, implying that parental effects are favored over selection for bet-hedging in which the mixture of offspring phenotypes produced does not depend on the parental phenotype. Positive parental effects (generating a positive correlation between parental and offspring phenotype) are favored in relatively stable habitats and when different types of local environment are roughly equally abundant, and can give rise to long-term parental inheritance of phenotypes. By contrast, unstable habitats can favor negative parental effects (generating a negative correlation between parental and offspring phenotype), and under these circumstances even slight asymmetries in the abundance of local environmental states select for marked asymmetries in transmission fidelity.

Social Cohesion, Breaks, and Transformations in Italy, 535–600

2018 ◽  
Author(s):  
Walter Pohl
Keyword(s):  
The Political ◽  
Late Antique ◽  
Religious Context ◽  
Ancient Society ◽  
Complex Process ◽  
Term Change ◽  
Two Generations ◽  
Classical Culture

When the Gothic War began in Italy in 535, the country still conserved many features of classical culture and late antique administration. Much of that was lost in the political upheavals of the following decades. Building on Chris Wickham’s work, this contribution sketches an integrated perspective of these changes, attempting to relate the contingency of events to the logic of long-term change, discussing political options in relation to military and economic means, and asking in what ways the erosion of consensus may be understood in a cultural and religious context. What was the role of military entrepreneurs of more or less barbarian or Roman extraction in the distribution or destruction of resources? How did Christianity contribute to the transformation of ancient society? The old model of barbarian invasions can contribute little to understanding this complex process. It is remarkable that for two generations, all political strategies in Italy ultimately failed.

scholarly journals Lipid Metabolic Reprogramming in Hepatocellular Carcinoma

Cancers ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 447 ◽  
Author(s):  
Hayato Nakagawa ◽  
Yuki Hayata ◽  
Satoshi Kawamura ◽  
Tomoharu Yamada ◽  
Naoto Fujiwara ◽  
...  
Keyword(s):  
Risk Factors ◽  
Hepatocellular Carcinoma ◽  
Local Environment ◽  
Metabolic Reprogramming ◽  
Glutamine Metabolism ◽  
Metabolic Alterations ◽  
Rich Condition ◽  
Visceral Adipose ◽  
Hcc Cells

Metabolic reprogramming for adaptation to the local environment has been recognized as a hallmark of cancer. Although alterations in fatty acid (FA) metabolism in cancer cells have received less attention compared to other metabolic alterations such as glucose or glutamine metabolism, recent studies have uncovered the importance of lipid metabolic reprogramming in carcinogenesis. Obesity and nonalcoholic steatohepatitis (NASH) are well-known risk factors of hepatocellular carcinoma (HCC), and individuals with these conditions exhibit an increased intake of dietary FAs accompanied by enhanced lipolysis of visceral adipose tissue due to insulin resistance, resulting in enormous exogenous FA supplies to hepatocytes via the portal vein and lymph vessels. This “lipid-rich condition” is highly characteristic of obesity- and NASH-driven HCC. Although the way in which HCC cells adapt to such a condition and exploit it to aid their progression is not understood, we recently obtained new insights into this mechanism through lipid metabolic reprogramming. In addition, accumulating evidence supports the importance of lipid metabolic reprogramming in various situations of hepatocarcinogenesis. Thus, in this review, we discuss the latest findings regarding the role of FA metabolism pathways in hepatocarcinogenesis, focusing on obesity- and NASH-driven lipid metabolic reprogramming.

Sir Charles Dilke and the British Intervention In Egypt, 1882: decision making In a nineteenth-century cabinet

1976 ◽  
Vol 2 (3) ◽  
pp. 231-245 ◽  
Author(s):  
M. E. Chamberlain
Keyword(s):  
Nineteenth Century ◽  
Decision Making ◽  
British Imperialism ◽  
Exact Role ◽  
The Unconscious ◽  
William Gladstone ◽  
Two Generations ◽  
Liberal Government

“There's Dilke that has done it all”, remarked Wilfrid Scawen Blunt to Lord Blandford as they watched Dilke walk down Piccadilly one day in July 1882.1 The “it” was the British intervention in Egypt which entangled Britain in Egyptian affairs for two generations. More soberly, Louis Mallet, the Permanent Under-Secretary at the India Office, wrote to Evelyn Baring a year later that the Liberal government of William Gladstone had made themselves “the unconscious, and some of them (not all) the unwilling instruments of a policy from which Lord Beaconsfield and Lord Salisbury would have shrunk, and which is big with future disaster”. “Dilke and Chamberlain” he wrote, “I consider mainly responsible for the Egyptian war.” In The Trouble Makers, A. J. P. Taylor came to the conclusion, “The occupation of Egypt in 1882 marked Gladstone's decisive breach with Radicalism. Indeed it ruined Radicalism for more than a generation. It began modern British Imperialism…”. How ironic if the ruin of British radicalism was brought about by the two leading radicals of Gladstone's predominantly Whig administration. What do the Dilke and Chamberlain papers among others reveal about the exact role of the two men in the crisis ?

scholarly journals Exploration and Characterization of Trichoderma sp. in Conventional and Organic Rice field in Bali

2021 ◽  
Vol 5 (2) ◽  
Author(s):  
A. A. S. P. R. Andriani ◽  
Idris Sharif ◽  
Bohari M Yamin ◽  
S. A. M. P. Suryani ◽  
Krisnawan Kalimutu
Keyword(s):  
Trichoderma Harzianum ◽  
Rice Field ◽  
Local Environment ◽  
High Density ◽  
Rice Cultivation ◽  
Trichoderma Spp ◽  
Plastic Container ◽  
Trichoderma Sp ◽  
Long Time

Abstract. Although Trichoderma spp has been widely used in the SRI technique of rice cultivation the sources of Trichoderma that can adapt well to the local environment have been an interesting issue for quite some time.  It is commonly agreed that the local Trichoderma is much more preferred to be used for rice cultivation. In the present study, the Trichoderma from the soil of a rice field in Sukawati District,  Bali where conventional fertilizer and pesticide has been applied for a very long time was isolated.  After macroscopic observations (green color and sweet coconut smell ) the single isolated fungi have very much resembled Trichoderma Harzianum. 2 mL of the Trichoderma Harzianum solution was introduced in a plastic container containing 200 g half-boiled rice. After seven days the rice in the plastic appeared green. This sample will be used to produce more T. Harzianum for rice cultivation. One of the T.Harzianum treated rice hosts was coated with gold and subjected to SEM observation. Very high populated T. Harzianum fungi were observed. It was  dominated by hyphae. No conidia and conidiophores were spotted. Instead, quite a high density of spherical and oval shape spores was observed. Such a high density of T.Harzianum will certainly meet the requirement for an efficient application in the cultivation field. It would also be interesting to see the interaction between such a highly populated T.Harzianum  with other fungi or pathogens in understanding the role of Trichoderma as an antipathogen

Technology and culture

2011 ◽  
pp. 273-285 ◽  
Author(s):  
Alev M. Efendioglu ◽  
Vincent F. Yip
Keyword(s):  
Local Environment ◽  
The Internet ◽  
Economic Factors ◽  
Technology And Culture ◽  
Internet Users ◽  
The World ◽  
Different Characteristics ◽  
The Impact ◽  
Socio Economic Factors

The number of Internet users around the world has been steadily growing and this growth has provided the impetus and the opportunities for global and regional e-commerce. However, as with the Internet, different characteristics (infrastructure and socio-economic) of the local environment have created a significant level of variation in the acceptance and growth of e-commerce in different regions of the world. Our research focuses on the impact of these infrastructure and socio-economic factors on e-commerce development in China and the findings provide insights into the role of culture in e-commerce, and the factors that may impact a broader acceptance and development of e-commerce in China. In this chapter, we present and discuss our findings, and propose some strategies for success for e-commerce in China.

scholarly journals Generations Comparison: Father Role Representations in the 1980s and the New Millennium

Genealogy ◽  
2019 ◽  
Vol 3 (2) ◽  
pp. 17 ◽  
Author(s):  
Maria Letizia Bosoni ◽  
Sara Mazzucchelli
Keyword(s):  
Point Of View ◽  
Current Debate ◽  
The Social ◽  
Two Generations ◽  
Academic Publications ◽  
Research Questions ◽  
Father Role ◽  
Changing Role ◽  
New Millennium

In the light of relevant and current debate on the changing role of fathers, this contribution is aimed at analysing the international literature on fatherhood, comparing two distinct periods of time, from the social, cultural and demographic point of view: the years 1980–1999 and the new millennium. This will contribute to identifying features of the fatherhood transformation in these two contexts, which in fact refer to two generations of fathers. The research questions to be answered are: Which aspects characterize the process of fatherhood transformation, in an intergenerational perspective? How are paternal childcare practices represented in different historical and social periods? An analysis of the academic publications on fathers in Scopus and Google Scholar will be conducted, in the two temporal periods indicated, using T-Lab software, in order to map fathers’ role representations.

scholarly journals Climate as an Evolutionary Driver of Nest Morphology in Birds: A Review

2020 ◽  
Vol 8 ◽  
Author(s):  
Daniela M. Perez ◽  
Janet L. Gardner ◽  
Iliana Medina
Keyword(s):  
Local Environment ◽  
Climatic Conditions ◽  
Future Research ◽  
Extended Phenotype ◽  
The Face ◽  
Building Behavior ◽  
Fledgling Success ◽  
Nest Microclimate ◽  
The Relationship

Avian nests are critical for successful reproduction in birds. Nest microclimate can affect egg development, chick growth and fledgling success, suggesting that nest building behavior should be under strong selective pressure to nesting conditions. Given that the internal microclimate of the nest is critical for avian fitness, it is expected that nest morphology is shaped by the local environment. Here we review the relationship between nest morphology and climate across species’ distributions. We collate growing evidence that supports a link between environmental conditions and particular nest traits, within species and across species. We discuss the degree to which phenotypic plasticity in nesting behavior can contribute to observed variation in nest traits, the role of phylogenetic history in determining nest morphology, and which nest traits are likely to be influenced by climatic conditions. Finally, we identify gaps in our understanding of the evolution of nest morphology and suggest topics for future research. Overall, we argue that nests are part of the extended phenotype of a bird, they play a crucial role in their reproductive success, and may be an important factor in determining which species will be able to persist in the face of ongoing climate change.

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