Heterochrony

Horder, Tim

doi:10.1038/npg.els.0004180

Cited by 3 publications

(2 citation statements)

References 15 publications

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“…In a phenomenon known as paedomorphosis, individuals retain a larval phenotype. They live and reach sexual maturity in the water (Gould, 1977;Horder, 2006). Paedomorphic species obviate the terrestrial phase of the standard biphasic life cycle.…”

Section: Reproductive Modes In Salamandersmentioning

confidence: 99%

“…All these structures appear much later during development in ovoviviparous embryos. This constitutes an example of heterochrony, that is, the change in the timing of some events during development compared to the ancestral developmental sequence of the group, in this case, ovoviviparity (Horder, 2006;Buckley et al, 2007). The heterochronic pattern of development enables the embryos to feed actively on the unfertilized and abortive eggs (i.e., oophagy).…”

Section: Lyciasalamandramentioning

confidence: 99%

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Evolution of Viviparity in Salamanders (Amphibia, Caudata)

Buckley

2012

Encyclopedia of Life Sciences

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Reproductive modes in salamanders (Amphibia, Caudata) are highly diverse. Viviparity, for instance, implies the retention of the developing embryos inside the females until the end of the gestation, at which point they deliver fully developed terrestrial juveniles. From an ecological point of view, the evolution of viviparity is highly significant, since it implies the semi‐independence of water for an amphibian. Nevertheless, viviparity is not very common among salamander. It has independently evolved only in a few species, all included within the family Salamandridae. Furthermore, the characteristics of viviparous strategies are different among species, although they all share some commonalities. The detailed study of these particular and common features in a phylogenetic context will reveal the genetic, physiological, developmental, morphological and historic factors that have triggered the evolution of this peculiar mode of reproduction in only one lineage among all the species of salamanders. Key Concepts: Viviparity entails the complete development of the progeny within the mother's genital tract, together with the maternal provisioning of nutrients to the embryos. Since development occurs within the females, viviparity in amphibians implies that the aquatic phase of the standard amphibian life cycle is obviated in viviparous species. Viviparity has independently evolved only in a few species of salamanders.

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Section: Reproductive Modes In Salamandersmentioning

confidence: 99%

Section: Lyciasalamandramentioning

confidence: 99%

Evolution of Viviparity in Salamanders (Amphibia, Caudata)

Buckley

2012

Encyclopedia of Life Sciences

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The Role of Neoteny in Human Evolution: From Genes to the Phenotype

Somel

Tang

Khaitovich

2011

Post-Genome Biology of Primates

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Pleiotropy as the Mechanism for Evolving Novelty: Same Signal, Different Result

Torday

2015

Biology

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In contrast to the probabilistic way of thinking about pleiotropy as the random expression of a single gene that generates two or more distinct phenotypic traits, it is actually a deterministic consequence of the evolution of complex physiology from the unicellular state. Pleiotropic novelties emerge through recombinations and permutations of cell-cell signaling exercised during reproduction based on both past and present physical and physiologic conditions, in service to the future needs of the organism for its continued survival. Functional homologies ranging from the lung to the kidney, skin, brain, thyroid and pituitary exemplify the evolutionary mechanistic strategy of pleiotropy. The power of this perspective is exemplified by the resolution of evolutionary gradualism and punctuated equilibrium in much the same way that Niels Bohr resolved the paradoxical duality of light as Complementarity.

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Heterochrony

Abstract: Heterochrony is a supposedly important mechanism for macroevolutionary change based on shifts in the timing of developmental events in the embryo.

Cited by 3 publications

References 15 publications

Evolution of Viviparity in Salamanders (Amphibia, Caudata)

Evolution of Viviparity in Salamanders (Amphibia, Caudata)

The Role of Neoteny in Human Evolution: From Genes to the Phenotype

Pleiotropy as the Mechanism for Evolving Novelty: Same Signal, Different Result

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