scholarly journals Domestication as a model system for the extended evolutionary synthesis

2017 ◽  
Vol 7 (5) ◽  
pp. 20160133 ◽  
Author(s):  
Melinda A. Zeder
Keyword(s):  
Evolutionary Biology ◽  
Model System ◽  
Evolutionary Change ◽  
Evolutionary Synthesis ◽  
The Novel ◽  
Extended Evolutionary Synthesis ◽  
Model Case ◽  
The Core ◽  
Multiple Regions

One of the challenges in evaluating arguments for extending the conceptual framework of evolutionary biology involves the identification of a tractable model system that allows for an assessment of the core assumptions of the extended evolutionary synthesis (EES). The domestication of plants and animals by humans provides one such case study opportunity. Here, I consider domestication as a model system for exploring major tenets of the EES. First I discuss the novel insights that niche construction theory (NCT, one of the pillars of the EES) provides into the domestication processes, particularly as they relate to five key areas: coevolution, evolvability, ecological inheritance, cooperation and the pace of evolutionary change. This discussion is next used to frame testable predictions about initial domestication of plants and animals that contrast with those grounded in standard evolutionary theory, demonstrating how these predictions might be tested in multiple regions where initial domestication took place. I then turn to a broader consideration of how domestication provides a model case study consideration of the different ways in which the core assumptions of the EES strengthen and expand our understanding of evolution, including reciprocal causation, developmental processes as drivers of evolutionary change, inclusive inheritance, and the tempo and rate of evolutionary change.

Nanomaterial synthesis and characterization for toxicological studies: TiO2 case study

2008 ◽  
Vol 72 (1) ◽  
pp. 515-519 ◽  
Author(s):  
E. Valsami-Jones ◽  
D. Berhanu ◽  
A. Dybowska ◽  
S. Misra ◽  
A. R. Boccaccini ◽  
...  
Keyword(s):  
Surface Modifications ◽  
Model System ◽  
Synthesis And Characterization ◽  
The Novel ◽  
Commercial Products ◽  
Nanomaterial Synthesis ◽  
Toxicological Studies

AbstractIn recent years it has become apparent that the novel properties of nanomaterials may predispose them to a hitherto unknown potential for toxicity. A number of recent toxicological studies of nanomaterials exist, but these appear to be fragmented and often contradictory. Such discrepancies may be, at least in part, due to poor description of the nanomaterial or incomplete characterization, including failure to recognise impurities, surface modifications or other important physicochemical aspects of the nanomaterial. Herew em ake a casef or the importance of good quality, well-characterized nanomaterials for future toxicological studies, combined with reliable synthesis protocols, and we present our efforts to generate such materials. The model system for which we present results is TiO2 nanoparticles, currently used in a variety of commercial products.

scholarly journals Evolutionary biology today and the call for an extended synthesis

2017 ◽  
Vol 7 (5) ◽  
pp. 20160145 ◽  
Author(s):  
Douglas J. Futuyma
Keyword(s):  
Natural Selection ◽  
Evolutionary Theory ◽  
Evolutionary Biology ◽  
Epigenetic Inheritance ◽  
Reaction Norm ◽  
Evolutionary Synthesis ◽  
Historical Background ◽  
Extended Evolutionary Synthesis ◽  
Extended Synthesis ◽  
Proximate Causation

Evolutionary theory has been extended almost continually since the evolutionary synthesis (ES), but except for the much greater importance afforded genetic drift, the principal tenets of the ES have been strongly supported. Adaptations are attributable to the sorting of genetic variation by natural selection, which remains the only known cause of increase in fitness. Mutations are not adaptively directed, but as principal authors of the ES recognized, the material (structural) bases of biochemistry and development affect the variety of phenotypic variations that arise by mutation and recombination. Against this historical background, I analyse major propositions in the movement for an ‘extended evolutionary synthesis’. ‘Niche construction' is a new label for a wide variety of well-known phenomena, many of which have been extensively studied, but (as with every topic in evolutionary biology) some aspects may have been understudied. There is no reason to consider it a neglected ‘process’ of evolution. The proposition that phenotypic plasticity may engender new adaptive phenotypes that are later genetically assimilated or accommodated is theoretically plausible; it may be most likely when the new phenotype is not truly novel, but is instead a slight extension of a reaction norm already shaped by natural selection in similar environments. However, evolution in new environments often compensates for maladaptive plastic phenotypic responses. The union of population genetic theory with mechanistic understanding of developmental processes enables more complete understanding by joining ultimate and proximate causation; but the latter does not replace or invalidate the former. Newly discovered molecular phenomena have been easily accommodated in the past by elaborating orthodox evolutionary theory, and it appears that the same holds today for phenomena such as epigenetic inheritance. In several of these areas, empirical evidence is needed to evaluate enthusiastic speculation. Evolutionary theory will continue to be extended, but there is no sign that it requires emendation.

scholarly journals Why an extended evolutionary synthesis is necessary

2017 ◽  
Vol 7 (5) ◽  
pp. 20170015 ◽  
Author(s):  
Gerd B. Müller
Keyword(s):  
Evolutionary Biology ◽  
Evolutionary Process ◽  
Evolutionary Developmental Biology ◽  
Standard Theory ◽  
The Novel ◽  
Ecological Interactions ◽  
Extended Evolutionary Synthesis ◽  
Cultural Conditions ◽  
Theoretical Synthesis

Since the last major theoretical integration in evolutionary biology—the modern synthesis (MS) of the 1940s—the biosciences have made significant advances. The rise of molecular biology and evolutionary developmental biology, the recognition of ecological development, niche construction and multiple inheritance systems, the ‘-omics’ revolution and the science of systems biology, among other developments, have provided a wealth of new knowledge about the factors responsible for evolutionary change. Some of these results are in agreement with the standard theory and others reveal different properties of the evolutionary process. A renewed and extended theoretical synthesis, advocated by several authors in this issue, aims to unite pertinent concepts that emerge from the novel fields with elements of the standard theory. The resulting theoretical framework differs from the latter in its core logic and predictive capacities. Whereas the MS theory and its various amendments concentrate on genetic and adaptive variation in populations, the extended framework emphasizes the role of constructive processes, ecological interactions and systems dynamics in the evolution of organismal complexity as well as its social and cultural conditions. Single-level and unilinear causation is replaced by multilevel and reciprocal causation. Among other consequences, the extended framework overcomes many of the limitations of traditional gene-centric explanation and entails a revised understanding of the role of natural selection in the evolutionary process. All these features stimulate research into new areas of evolutionary biology.

scholarly journals The Dual Role of Evo-Devo Mechanisms and the Extended Evolutionary Synthesis

2019 ◽  
Vol 22 (2) ◽  
pp. 251-275
Author(s):  
Guillermo Folguera ◽  
Nicolás Lavagnino
Keyword(s):  
Evolutionary Biology ◽  
Evolutionary Developmental Biology ◽  
Biological Variation ◽  
Dual Role ◽  
Evolutionary Synthesis ◽  
Main Question ◽  
Extended Evolutionary Synthesis ◽  
Evo Devo ◽  
Somatic Selection

The distinction between mechanisms that generate biological variation and mechanisms that modify it has been important in contemporary Biology, especially since the establishment of the Evolutionary Synthesis (ES) in the first part of the twentieth century. In the ES, and in its subsequent legacy to evolutionary biology, the focus was directed at mechanisms that modify biological variation. In recent years, evo-devo (Evolutionary Developmental Biology) emerged as an area of knowledge that proposes to extend the ES in many forms. In this sense, given that evo-devo integrates different areas of Biology, different types of mechanisms can be found. In order to understand evo-devo mechanisms, as well as its relation with the ES, we analyzed the role that evo-devo mechanisms play with respect to biological variation. The main question in our analysis was: do evo-devo mechanisms have a function of generators and/or modifiers of biological variation? We focused on three evo-devo mechanisms: environmental induction, hypervariability/somatic selection and developmental bias. Our analysis showed a different characterization of the action of evo-devo mechanisms. This heterogeneity in the role of evo-devo mechanisms shows that, in general, the distinction is maintained but there is a mechanism that presents a dual role. Our analysis indicates that, at least with respect to mechanisms, evo-devo extends and departs from what was proposed in the evolutionary synthesis.

scholarly journals Extending the Explanatory Scope of Evolutionary Theory: The Origin of Historical Kinds in Biology and Culture

2020 ◽  
Author(s):  
Gunter Wagner ◽  
Gary Tomlinson
Keyword(s):  
Evolutionary Theory ◽  
Population Biology ◽  
Evolutionary Biology ◽  
Cell Types ◽  
Biological Species ◽  
Evolutionary Synthesis ◽  
Extended Evolutionary Synthesis ◽  
Modern Evolutionary Synthesis ◽  
Intellectual Challenge ◽  
Recent Extension

Since its inception, evolutionary theory has experienced a number of extensions. The most important of these took the forms of the Modern Evolutionary Synthesis (MES), embracing genetics and population biology in the early 20th century, and the Extended Evolutionary Synthesis (EES) of the last thirty years, embracing, among other factors, non-genetic forms of inheritance. While we appreciate the motivation for this recent extension, we argue that it does not go far enough, since it restricts itself to widening explanations of adaptation by adding mechanisms of inheritance and variation. Here we argue that a more thoroughgoing extension is needed, one that broadens the explanatory scope of evolutionary theory. In addition to adaptation and its various mechanisms, evolutionary theory must recognize as a distinct intellectual challenge the origin of what we call “historical kinds.” Under historical kinds we include any process that acquires a quasi-independent and traceable lineage-history in biological and cultural evolution. A limited number of historical kinds have been recognized in evolutionary biology, and corresponding research programs have been formed around them. The best characterized examples are biological species and genes. We propose that the conceptual category of historical kinds can and needs to be extended, and we develop the notion of a historical kind in a series of paradigmatic exemplars, from genes and cell types to rituals and music. The explanation of the origin of historical kinds should be a main objective of biological and cultural sciences.

scholarly journals The extended evolutionary synthesis: its structure, assumptions and predictions

2015 ◽  
Vol 282 (1813) ◽  
pp. 20151019 ◽  
Author(s):  
Kevin N. Laland ◽  
Tobias Uller ◽  
Marcus W. Feldman ◽  
Kim Sterelny ◽  
Gerd B. Müller ◽  
...  
Keyword(s):  
Conceptual Framework ◽  
Evolutionary Theory ◽  
Evolutionary Biology ◽  
Developmental Plasticity ◽  
Niche Construction ◽  
Evolutionary Synthesis ◽  
Extended Evolutionary Synthesis ◽  
Character Variation ◽  
Advance Research ◽  
Evo Devo

Scientific activities take place within the structured sets of ideas and assumptions that define a field and its practices. The conceptual framework of evolutionary biology emerged with the Modern Synthesis in the early twentieth century and has since expanded into a highly successful research program to explore the processes of diversification and adaptation. Nonetheless, the ability of that framework satisfactorily to accommodate the rapid advances in developmental biology, genomics and ecology has been questioned. We review some of these arguments, focusing on literatures (evo-devo, developmental plasticity, inclusive inheritance and niche construction) whose implications for evolution can be interpreted in two ways—one that preserves the internal structure of contemporary evolutionary theory and one that points towards an alternative conceptual framework. The latter, which we label the ‘extended evolutionary synthesis' (EES), retains the fundaments of evolutionary theory, but differs in its emphasis on the role of constructive processes in development and evolution, and reciprocal portrayals of causation. In the EES, developmental processes, operating through developmental bias, inclusive inheritance and niche construction, share responsibility for the direction and rate of evolution, the origin of character variation and organism–environment complementarity. We spell out the structure, core assumptions and novel predictions of the EES, and show how it can be deployed to stimulate and advance research in those fields that study or use evolutionary biology.

scholarly journals Plant Evolutionary Ecology in the Age of the Extended Evolutionary Synthesis

2019 ◽  
Vol 59 (3) ◽  
pp. 493-502 ◽  
Author(s):  
Mark E Olson
Keyword(s):  
Evolutionary Biology ◽  
Evolutionary Ecology ◽  
Plant Ecology ◽  
Modern Synthesis ◽  
Theory And Practice ◽  
Evolutionary Synthesis ◽  
Extended Evolutionary Synthesis ◽  
Extended Synthesis ◽  
As Stress ◽  
Plant Ecological

AbstractPlant ecology is increasingly turning to evolutionary questions, just as evolutionary biology pushes out of the strictures of the Modern Synthesis into what some regard as an “Extended Evolutionary Synthesis.” As plant ecology becomes increasingly evolutionary, it is essential to ask how aspects of the Extended Synthesis might impinge on plant ecological theory and practice. I examine the contribution of plant evolutionary ecology to niche construction theory, as well as the potential for developmental systems theory and genes-as-followers adaptive evolution, all important post-Modern Synthesis themes, in providing novel perspectives for plant evolutionary ecology. I also examine ways that overcoming dichotomies such as “genetic vs. plastic” and “constraint vs. adaptation” provide fertile opportunities for plant evolutionary ecologists. Along the same lines, outgrowing vague concepts such as “stress” and replacing them with more precise terminology in all cases provides vastly increased causal clarity. As a result, the synthetic path that plant ecologists are blazing, becoming more evolutionary every year, bodes extremely well for the field, with vast potential for expansion into important scientific territory.

scholarly journals Interpreting the History of Evolutionary Biology through a Kuhnian Prism: Sense or Nonsense?

2021 ◽  
Vol 29 (1) ◽  
pp. 1-35
Author(s):  
Koen B. Tanghe ◽  
Lieven Pauwels ◽  
Alexis De Tiège ◽  
Johan Braeckman
Keyword(s):  
Evolutionary Biology ◽  
Developmental Model ◽  
Evolutionary Synthesis ◽  
Extended Evolutionary Synthesis ◽  
Origin Of Species ◽  
Scientific Revolutions ◽  
Structure Of Scientific Revolutions ◽  
History Of ◽  
Modern Evolutionary Synthesis

Traditionally, Thomas S. Kuhn’s The Structure of Scientific Revolutions (1962) is largely identified with his analysis of the structure of scientific revolutions. Here, we contribute to a minority tradition in the Kuhn literature by interpreting the history of evolutionary biology through the prism of the entire historical developmental model of sciences that he elaborates in The Structure. This research not only reveals a certain match between this model and the history of evolutionary biology but, more importantly, also sheds new light on several episodes in that history, and particularly on the publication of Charles Darwin’s On the Origin of Species (1859), the construction of the modern evolutionary synthesis, the chronic discontent with it, and the latest expression of that discontent, called the extended evolutionary synthesis. Lastly, we also explain why this kind of analysis hasn’t been done before.

scholarly journals The extended evolutionary synthesis and the role of soft inheritance in evolution

2012 ◽  
Vol 279 (1740) ◽  
pp. 2913-2921 ◽  
Author(s):  
Thomas E. Dickins ◽  
Qazi Rahman
Keyword(s):  
Cultural Transmission ◽  
Evolutionary Biology ◽  
Inclusive Fitness ◽  
Average Lifetime ◽  
Biological Organization ◽  
Extended Evolutionary Synthesis ◽  
The Core ◽  
Made In ◽  
Key Questions

In recent years, a number of researchers have advocated extending the modern synthesis in evolutionary biology. One of the core arguments made in favour of an extension comes from work on soft inheritance systems, including transgenerational epigenetic effects, cultural transmission and niche construction. In this study, we outline this claim and then take issue with it. We argue that the focus on soft inheritance has led to a conflation of proximate and ultimate causation, which has in turn obscured key questions about biological organization and calibration across the life span to maximize average lifetime inclusive fitness. We illustrate this by presenting hypotheses that we believe incorporate the core phenomena of soft inheritance and will aid in understanding them.

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