A genetic basis for intraspecific differences in developmental timing?

Tills, Oliver; Rundle, Simon D.; Salinger, Moritz; Haun, Timm; Pfenninger, Markus; Spicer, John I.

doi:10.1111/j.1525-142x.2011.00510.x

Cited by 24 publications

(24 citation statements)

References 27 publications

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“…Within populations, this produces so-called intraspecific variation: heterochronic change being targeted by natural selection. Because heterochrony is so important in providing raw material on which natural selection can operate, it plays a very important role in evolution (McKinney and McNamara 1991;McNamara 1995aMcNamara , b, 1997Tills et al 2011). As well as operating within species at this level of intraspecific variation, it also occurs between sexes (McNamara 1995b); between species, in generating evolutionary trends (McNamara 1982(McNamara , 1990; and in the evolution of major morphological novelties, such as vertebrates and birds (McNamara 1997;McNamara and McKinney 2005).…”

Section: What Is Heterochrony?mentioning

confidence: 99%

Heterochrony: the Evolution of Development

2012

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Heterochrony can be defined as change to the timing or rate of development relative to the ancestor. Because organisms generally change in shape as well as increase in size during their development, any variation to the duration of growth or to the rate of growth of different parts of the organism can cause morphological changes in the descendant form. Heterochrony takes the form of both increased and decreased degrees of development, known as "peramorphosis" and "paedomorphosis," respectively. These are the morphological consequences of the operation of processes that change the duration of the period of an individual's growth, either starting or stopping it earlier or later than in the ancestor, or by extending or contracting the period of growth. Heterochrony operates both intra-and interspecifically and is the source of much intraspecific variation. It is often also the cause of sexual dimorphism. Selection of a sequence of species with a specific heterochronic trait can produce evolutionary trends in the form of pera-or paedomorphoclines. Many different life history traits arise from the operation of heterochronic processes, and these may sometimes be the targets of selection rather than morphological features themselves. It has been suggested that some significant steps in evolution, such as the evolution of vertebrates, were engendered by heterochrony. Human evolution was fuelled by heterochrony, with some traits, such as a large brain, being peramorphic, whereas others, such as reduced jaw size, are paedomorphic.

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Section: What Is Heterochrony?mentioning

confidence: 99%

Heterochrony: the Evolution of Development

2012

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“…Early divergence is sometimes noticeable even at intraspecifi c level, as shown by Tills et al ( 2011 ) for the pond snail Radix balthica .…”

Section: Hot Points Of Change Along the Developmental Schedulementioning

confidence: 96%

EvoDevo and Its Significance for Animal Evolution and Phylogeny

Minelli

2015

Evolutionary Developmental Biology of Invertebrates 1

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“…A number of more recent studies seem to aim at extending the use of the concept to the earliest developmental stages and ultimately to a basis in cellular and molecular terms (e.g. Elinson and Kezmoh, 2010;Tills et al, 2011). See also: Allometry and Metabolic Scaling in Ecology; Thompsonian Transformations…”

Section: The Situation After Gouldmentioning

confidence: 99%

Heterochrony

Horder¹

2013

Encyclopedia of Life Sciences

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Heterochrony has often been proposed as a leading mechanism for macroevolutionary change in morphology of organisms, based simply on a relative shift in the timing of events during embryonic development in the evolving organisms. Its most recent formulation was in Gould's 'clock model'. Such timing shifts were seen as being controlled genetically (by 'rate genes') or by hormones (such as thyroxine). Heterochrony has much in common with the concept of allometry. The concept originated in the context of the idea of recapitulation where embryonic development was interpreted as a repetition of the organism's evolutionary history but in accelerated form; deviations from this recapitulation were identified as instances of heterochrony. In a later version used to explain macroevolutionary change (paedomorphosis), a new adult morphology is derived from ancestral larval forms by truncation of ancestral adult stages. However, it is difficult to see how genuine structural novelty can be explained, given that timing changes during development can in themselves do no more than redeploy preexisting characters. The explanatory value of the concept of heterochrony is increasingly questioned; at best it only indirectly relates to, or identifies, specific underlying mechanisms. It is in effect a form of redescription.

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A genetic basis for intraspecific differences in developmental timing?

Cited by 24 publications

References 27 publications

Heterochrony: the Evolution of Development

Heterochrony: the Evolution of Development

EvoDevo and Its Significance for Animal Evolution and Phylogeny

Heterochrony

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